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Author: Subject: Fireblade Engined Locost
Murdoc

posted on 4/9/16 at 12:31 PM Reply With Quote
Fireblade Engined Locost

I didn't build this locost, I bought it from a member on here unseen and my brother drove it 200miles back for me. A text book example on how not to buy a car but I though whatever is wrong with it, I will enjoy fixing. I have had the car just over a month so far.

The car:



This is just after my brother stepped out the car at my parents house, he refused to drive it 20miles further south to my house. I don't blame him and I really owe him a trackday in it.
Immediate issues when he got back were, the car was very loud, the speedometer didn't work, the tacho didn't work, no neutral and gear indication, stalls when cold, the brakes were woeful and the clutch was digital. Good news though, engine runs well and the chassis is very well made with excellent welding.

The magnetic pickup for the speedo was in but just not set up, no idea why. Easy fix, I drove along with my phone taped to the dash measuring GPS speed and adjusted accordingly.

The exhaust had a pretty serious crack in it so I welded that up, now it's much quieter.

I adjusted the clutch and lubricated the cable, again easy fix.

The tacho was a bit more of an issue, I got the car two weeks before going on holiday so I only had limited time to play. It was dancing around on the Acewell dash, I put an old oscilloscope on the signal and could see it was going between 14V and 5V. A function generator connected to the dash confirmed it would be happy with 0 - 5V so I dropped a Zener in but no luck. I tried to design a filter when that didn't work I changed components on a breadboard until it did work. Ended up using a high pass RC filter with another cap across the resistor. Not something you would ever design, but it works.


The neutral switch simply wasn't connected to the right harness, the neutral input connected to somewhere daft (can't remember now).

At this point the car was fairly drivable but made a terrible banging/scraping noise going around a corner hard, I had a look under the car and a number of bolt threads had been left long and were clearly scraping on the ground. So I remade the exhaust bracket as the one on the car was rough and put and extra bolt in the passenger seat to make the required 4.

New bracket (wet paint still) and old bracket:


I had noticed that the chassis moved a lot on the rear axle and I could see the diff and prop had been hitting the chassis. I know only a bit about live axle suspension but I had watched enough Motor Trent Youtube videos to know about Panhard rods so I was a bit surprised there wasn't one. There is a thread on here asking if they are considered optional, the answer is no, very much not.

No rod:


I took the rear of the car off and found a number of other issues; heavily leaking wheel cylinders, fuel tank attached with loose m4 machine screws, roll bar rear stays not attached, poor welding on the roll bar.

I ordered rose joints from McGill Motorsports and set about making the brackets required:









Next was the roll cage that wasn't attached at the rear, made some filler pieces and closed the box at the top (not a fan of this arrangement).




Replaced the rear bodywork supports, removed old cage welds and re-welded:



Replaced brake cylinders and adjusted brakes:



Moved the fuel tank forward to clear the Panhard rod and so I could attach it to the chassis rather than a thin bit of aluminium, used some M8 and M6 A2 stainless set screws.

At the point of putting the rear back on I couldn't bring myself to use the old bracket that attached the bodywork and numberplate light which can be seen in the picture below above the new bracket I made:



Painted and fitted, I neatened the wire up with heatshrink and braid too:



I did a few other jobs also, such as attaching wires and fuel lines with P clips and fixing poor wiring. I have also taken the 25mm lug centric wheel spacers off the rear, I really need narrower wheel arches:


Went out for a drive today and it feels so much better, very composed now. The original chassis builder did a great job but unfortunately some of work since (by subsequent owners) has been a lot of ambition but not enough skill and there are still things to put right. I'm enjoying working on it as much as driving it.

Plans: Bodywork, dynojet kit, neaten the dash, tidy the wiring, drive it.

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CosKev3

posted on 4/9/16 at 01:15 PM Reply With Quote
Looks ike you know what you are doing, which this car obviously needs!!!

Fairdos to your bruv driving it 200 miles with those issues!!!

Rear arches do make it look ridiculous,first thing I noticed in the for sale advert

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Matt21

posted on 4/9/16 at 04:09 PM Reply With Quote
Without the panhard rod, I assume when you are cornering there would have been massive amounts of lateral stress on the trailing arms/bushes?! I can't see how it would even last one hard corner with that kind of set up!

And the rear roll bar tubes not welded on to anything?!

Looks like you're going in the right direction with it!





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Murdoc

posted on 4/9/16 at 04:31 PM Reply With Quote
Thanks chaps.

While the lateral movement was fairly unrestrained the magnitude wasn't that great. A combination of the diff hitting the tunnel and chassis hitting the handbrake brackets meant it couldn't put that much stress on the other 4 links. I have inspected everything and it all seems fine. The previous owner put poly bushes in not that long ago and they are still tight, the chassis really is well made and the mounts look spot on.

On wheel arches, mine are ~290mm at the top. What width are normal ones, a quick search suggests this is normal, then why are my wheels so lost?
I haven't worked with fibreglass before. How easy would it be for me to resize them?

Thanks.

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ceebmoj

posted on 4/9/16 at 05:22 PM Reply With Quote
The origonal builder of this car is on hear.

I am a previous oner of the car, I sold it on a number of years ago in a semi striped state because it did not fit my needs and ended up building from scratch. I have tried contacting the seller a number of times to get them to edit the advert.

Please can I advice that you strip the paint from the two lower cassis rails between where you have put the new parhard bracket and the rest of the car and check the welds where the rear of the car was welded back on.

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Murdoc

posted on 4/9/16 at 05:32 PM Reply With Quote
Cheers ceebmoj, will do. I have sent you a PM.
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Murdoc

posted on 5/9/16 at 06:42 AM Reply With Quote
Hopefully you don't mind me posting this ceebmoj.

Summarising the conversation with ceebmoj. Part of the rear, which up until now has only supported the fuel tank and fog light (now plus panhard rod), was removed and later welded back on by someone after he sold it, thankfully not the person I bought the car off. I had a quick look without removing paint and the welds aren't the 'pigeon poo' style I found from the last owner. I will get the paint off in the next few days to double check but I don't expect them to be an issue. I have now tied this structure in to the rear roll bar stays which were previously unconnected.

As for ceebmoj's request for the seller to change the advert, the most sever misrepresentation isn't something I purchased and the other bit wouldn't have changed my decision to buy the car, it's just a bit more run in than I thought.

Is there a supplier of rear wheel arches besides kit car direct, theirs seem to be too wide?

Thanks.

[Edited on 5/9/16 by Murdoc]

[Edited on 5/9/16 by Murdoc]

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Daf

posted on 5/9/16 at 12:26 PM Reply With Quote
I'd have a go at narrowing your rear wings yourself, I recently did some fiberglassing for the first time in my life on my nosecone and I'm really pleased with the results. There are plenty of videos and guides online and it doesn't matter how much mess you make you can always flat it back, polish it and you'd never know! You clearly have the skills to be able to do it - give it a try

Don't hold me responsible if it goes wrong though!!

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Matt21

posted on 5/9/16 at 01:33 PM Reply With Quote
Has it got the right offset/width wheels?

I saw someone had narrowed some carbon rear wings, they basically cut the inside edge off that has the mounting face on it and the required width to be removed and then sikaflexed it back on to the inside of the arch. When its mounted the edge of the wing where it was cut sits up flush to the main body work.
That still gives you the mounting face but gets rid of the extra width.

Does that make sense?! haha

To me, the arches don't look wide, they look normal. It's just the set up of the axel/wheels that has something a miss.





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Murdoc

posted on 5/9/16 at 01:52 PM Reply With Quote
I did wonder if the ET was right, they a 6jjx13 so fairly wide. The tyre is near the rear bodywork when the spacers are removed.
What should the ET be?

That makes sense, I was thinking the same. I have thought about making a jig with my angle grinder to make a consistent cut. Can you cut fibreglass with a TCT router bit? That may be another way.

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Murdoc

posted on 5/9/16 at 03:53 PM Reply With Quote
Just pulled the wheels off and measured the offset as ET+14, so the mounting face is closer to the outside of the car than inside. Is that backwards? There seems to be a mix of people getting -ve and +ve offset confused on the forum.
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CosKev3

posted on 5/9/16 at 05:32 PM Reply With Quote
quote:
Originally posted by Murdoc
Thanks chaps.

While the lateral movement was fairly unrestrained the magnitude wasn't that great. A combination of the diff hitting the tunnel and chassis hitting the handbrake brackets meant it couldn't put that much stress on the other 4 links. I have inspected everything and it all seems fine. The previous owner put poly bushes in not that long ago and they are still tight, the chassis really is well made and the mounts look spot on.

On wheel arches, mine are ~290mm at the top. What width are normal ones, a quick search suggests this is normal, then why are my wheels so lost?
I haven't worked with fibreglass before. How easy would it be for me to resize them?

Thanks.


Just checked my rear arches and they are 290mm at the top.

Strange how yours look so big,could be the angle on them that makes them look strange,they slope down towards car.

Pretty sure the majority of people run a 7 inch wide alloy if they are using aftermarket ones.

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CosKev3

posted on 5/9/16 at 05:35 PM Reply With Quote
Not sure on the recommended offset for a live axle,but mine on Sierra rear irs is running a 7 inch wide alloy with a ET25 offset iirc
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Murdoc

posted on 5/9/16 at 05:39 PM Reply With Quote
Is that ET25 with the mounting face closer to the car or away from the car.

The wings do slope away, optical illusion I think. Although, I'm sure they are fixed too high.

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CosKev3

posted on 5/9/16 at 05:48 PM Reply With Quote
Description
Description


The mounting face is further out than in

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Matt21

posted on 6/9/16 at 07:29 AM Reply With Quote
Have a look on www.willtheyfit.com
Stick in your wheel size/offsets etc and new sizes and it will show you how the new set up will sit.

If going to a 7inch wide rim, and you need them to sit 40mm further out, it will need to be a -10 to -15 offset

Keeping the same size rims you have, you would need to get ET-25

(The 40mm is just rough guess at how far your wheels sit in the archs)

I did a quick look about and it seems a few folk are using ET-7 ET-10 on an english axel, so I reckon whoever got them wheels for it just got them because they were a good price and would do the job, but not be the right fit.





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Matt21

posted on 6/9/16 at 07:37 AM Reply With Quote
Some one on here is selling these, ET-7

13 minilite alloy wheels


That will make the outer edge sit out 33.7mm, and give you 8.3mm extra inside clearance
Sound perfect to me!





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Murdoc

posted on 6/9/16 at 08:53 AM Reply With Quote
Matt, thank you very much for the research. I will have a look at those wheels they look great.
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Murdoc

posted on 11/9/16 at 05:45 PM Reply With Quote
I didn't buy the wheels in the end (probably should have) I will give it a bit of time and think over the options.
The arches do seem a bit 'heavy' in their design, so even with the correct offset wheels I may have to do something with them.

I have replaced the radiator fan switch, had a poke around the carbs and adjusted the throttle. The throttle was only opening about 70% so the car is a fair bit quicker at high rpm now. The airbox wasn't attached to the carbs also for some reason, it just came off in my hand, not sure if the screws worked loose.

I'm going to build a manometer to balance the carbs, just need to get 4 plastic bottles the same. It's still not happy idling when cold and I think this may be the reason.

I have gone out for a few blasts in the car, with the suspension fixed, the brakes biting well and the extra power it really feels great and a lot more in control. My last 4 daily drivers have been RWD and the locost feels comfortable and predictable on the limit which I was a but surprised with given the short wheelbase.

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Harrodbear86

posted on 13/9/16 at 08:12 AM Reply With Quote
Hi mate,

Just reading your thread and noticed they were my wheels you were looking at. These are still for sale as the buyer didn't realise they are pick up only.

Let me know if you're interested.

Cheers,

Danny

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Harrodbear86

posted on 13/9/16 at 08:18 AM Reply With Quote
Hi mate,

Just reading your thread and noticed they were my wheels you were looking at. These are still for sale as the buyer didn't realise they are pick up only.

Let me know if you're interested.

Cheers,

Danny

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Murdoc

posted on 19/9/16 at 04:47 PM Reply With Quote
Hi Danny, thanks for letting me know. Unfortunately I have found a bunch of other things to spend money on at the moment so I'm going to have to miss them unless they are around for a while.

I went out for a spirited drive with a friend on the weekend, only 10 miles or so. On the way back I could smell gear oil. The insides of the rear wheels are coated, it seems the seals have gone on the bearing on the half shafts. I ordered a slide hammer but in the mean time managed to come up with a way to press them out.



It seems an attempt has been made to 'weld' the retaining collar in. Hopefully I can grind the pigeon poo out and get the collar off. Unless someone has some half shafts going cheap?

Is it worth going for the SKF kit: http://www.bearingkits.co.uk/SKF-Ford-English-axle-wheel-bearing-kit-for-Escort-Capri-Cortina-RS2000-Lotus-Kitcars-etc/582.htm

Rather than the cheaper ones from Burton: http://www.burtonpower.com/wheel-brg-kit-r-mk1-2-ford-escort-inc-rs-qwb148c.html

Do they have to be pressed back on or can it be done with careful application of a mallet?

I build a manometer to balance the carbs, acquiring the raw materials wasn't much of a hardship.



I replaced the coolant (it was just plain water), fixed the choke, bought a second hand K&N filter ready for the dynojet kit but I'm considering converting the engine to fuel injection instead. I have seen a 929 intake with injectors etc for £100.

Cheers

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Murdoc

posted on 12/11/16 at 10:27 AM Reply With Quote
I have done a few things on the locost.
EDIT: Forgot about the bearing, spoke to Steve at SP Components and went for the SKF kit, the other option seemed to be a bad idea. Steve's a really nice guy and helped me out getting the bearings on. The diff had around 20ml of oil in it when I pumped it out :/



/EDIT

I spent quite a while making the wheel arches fit correctly, I had them on and off quite a few times and trimmed a lot of material out. The arches had a flair out on the inside which was causing them to angle in, someone pointed this out earlier and I dismissed it as an illusion but it wasn't.



I had to trim the flair out by hand, then made a jig to take some width out:



Sliced some off the front to make them look less heavy using a similar jig:



End result looks a lot better I think:



The full beam lights wouldn't stay on so I took the scuttle off, decided I really need to rewire the car from scratch. The bike harness is still in there mostly complete and has been modified over the years. Easiest way to get rid of the bike harness is to convert it to run on a megasquirt.



I built this one for an MX-5 so had to swap the rpm input circuit from optical to VR in, using the latest MSII V3.0 filter it works great. Few different parts using what I had to hand or could get easily.

VR sensor output in yellow, signal to microcontroller in orange:



I didn't want to pass a large current through the MS so rather than fit a coil driver/IGBT in the MS I bought a MX-5 1.6 ignition amplifier off ebay, it works well. After poking around a fair bit, measuring toothed wheels on my spare engine and a few backfires the engine is running:



The manifold pressure is taken from the ports after the butterflies on the engine block, I have tee'd them all together but the engine doesn't seem to be pulling enough vacuum, it is near atmosphere as you can see in the picture above ~100kPa. I have double checked this with an old fashioned analogue gauge, opening the throttle the engine revs up. Holding my finger over the port on one cylinder it seems to suck and blow.

Does anyone know if this is normal? Doesn't look it to me, maybe the timing is off or the valves are worn?

Next I'm buying 954cc throttle bodies, injectors and intake (and maybe fitting the spare engine/investigate timing).

[Edited on 12/11/16 by Murdoc]

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Murdoc

posted on 29/12/16 at 11:08 AM Reply With Quote
Got a bit more work done.

Fitted the MX-5 fuel pump to the tank, the unit has a sender in too that I will wire up to the dash. The sender was at the wrong angle to fit in the tank but a blowtorch and adjustable spanner and it was the right way.


The existing wiring harness was in such a state I cut it out, it's full of bad crimps twisted wire and electrical tape.




Much better, although the car no longer runs



I have started to make parts for the harness, this is the injector harness swapped over to a superseal connector.



I'm going to attach the throttle bodies upside down compared to there position on the bike, this give the fuel a better shot in to the cylinders, I'm not sure why Honda did it any other way, perhaps packaging.
This meant the wax valve that controls the cold idle fouled on the cam cover so I had to drill and tap the throttle bodies to mount the wax valve between cylinders 1 and 2 instead of 3 and 4.





I'm waiting for some silicone hose to come in the post, then I can attach the TBs and work out the harness lengths.

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Murdoc

posted on 29/12/16 at 11:15 AM Reply With Quote
Got the TBs mounted on the engine. The engine has 45mm ports and the TBs are 50mm OD using 48mm hose I managed to get a good seal on both and account for the different bore spacing.


The wax valve clears the cam cover.


I started to run the new fuel lines, I took the prop out for access to fit the P clips, the cable ties used previously weren't quite up to the job. Unfortunately the prop bolts to the diff weren't even finger tight, they loosely moved when I touched them. The bolts the other end were finger tight but not much more. It seems the prop departed the diff at some point and chewed out the chassis so I had to make up a new cross piece with a bit of added clearance.



Fuel lines run, clearance is a bit more than it appears in this picture, I have jumped around on the suspension and it doesn't come close.

Made a simple bracket to hold the fuel filter.



Made a new panel and battery holder and the other one looked like it had been shot at and started to test fit.



Fitted the ingitor on a piece of cut down aluminium I section and started wiring up.


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