Delinquent
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| posted on 5/9/08 at 11:21 AM |
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quote:
Originally posted by MikeRJ
quote:
Originally posted by 02GF74
a common misconception; rover v8 is all alloy, big but light compared to old fords.
Where did the 150kg come from though? It's been questioned on here before as it seems too low. It might be all alloy, but it's a big
engine. Then you have to take into account the big heavy gearbox that will be needed to take the power.
Unless it's one of the rather lovely ones made from two bike engines, V8's suit muscle cars and Cobras a lot better than a 7 IMO. It
seems a bit pointless building what is supposed to be a very lightweight, sweet handling car and then sticking a heavy V8 in the nose. Each to their
own though.
Not only that, but as others have said, there are so many better engines out there, I really don't understand why anyone would contemplate a RV8
at all any more, unless they read too many custom car magazines as a Lad.
400bhp and similar levels of torque are almost available as standard with alternatives, and you could get close to that with a far smaller lighter
unit that would be more in keeping with the sevens ethos.
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MakeEverything
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| posted on 5/9/08 at 11:25 AM |
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doing a bit more reading, its looking more like 150kg.
If the car is lightweight, and the engine is what it is, then its less for the engine to drag along!
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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MakeEverything
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| posted on 5/9/08 at 11:29 AM |
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quote:
but ive been offered a reconditioned stage 3 powerplant for a song, an i just cant turn it down.
[Edited on 5/9/08 by MakeEverything]
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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AdamR
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| posted on 5/9/08 at 12:42 PM |
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quote:
Originally posted by mr henderson
An LT77 gearbox from SD1 would be the best bet price/value wise, if ytou can get one at a reasonable price an R380 would be better.
Borg Warner T5 is a much stronger box than the LT77, but I agree they are more expensive. There are usually some being sold by a TVR breaker on eBay
complete with RV8 bellhousing. Worth a look.
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AdamR
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| posted on 5/9/08 at 12:44 PM |
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quote:
Originally posted by mr henderson
An LT77 gearbox from SD1 would be the best bet price/value wise, if ytou can get one at a reasonable price an R380 would be better.
Borg Warner T5 is a much stronger box than the LT77, but I agree they are more expensive. There are usually some being sold by a TVR breaker on eBay
complete with RV8 bellhousing. Worth a look.
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CaptainJosh
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| posted on 5/9/08 at 12:54 PM |
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Check out www.locostusa.com , in the build diarys there are some v8 locosts, they work completely fine.
To be honest, alot of people in the UK are 'afraid' of V8's because we don't have them in alot of production cars. But a V8
locost is built heavier, bigger, and using a decent recent small block means the power to weight ratio is still rediculous. And most of all, its still
safe.
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TPG
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| posted on 5/9/08 at 01:54 PM |
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How about a BMW V8.I have one in a E38 740i. I am soon to sell the car. But if it doesn't go...Well.A light modern V8,backed by a 5 speed
'tip' box(Modify the shift to flappy paddles).traction control etc etc. Don't be put off by the electronics.They are pretty
easy.Transfer the lot and shorten or modify to fit.I've done it with a M30 3.5 into a E30,fly by wire also.Its stupid quick in the current
barge,think of it in a Locost.There is a BMW based haynes roadster about somewhere.Good luck anyway
..Which was nice..
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adam1985
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| posted on 5/9/08 at 02:14 PM |
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i think the first idea was best. BEC
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NS Dev
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| posted on 5/9/08 at 02:20 PM |
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I'm not remotely afraid of V8's, I'm a complete petrolhead and NO car I have EVER been in has "scared" or "
worried" me due to excessive power, in fact most feel like they could use more. (this includes a 720hp Ultima by the way, I do speak here from
experience! )
Personally, I think a V8 is a waste of time and effort in a seven of any sort.
Too much torque for the wheels to make any use of, delivered at totally the wrong rpm to be of any use.
Personally I then think that MOST bike engines err too far the opposite way.
A high revving v6 with around 300-325hp, or a 270hp 4 cylinder engine, both normally aspirated, will make for the fastest 7, just check lap times on
any track.
Yes, playing with the V8 will be great fun, it will be a good laugh for a few months, but I think you will then tire of it.
Up to you though, we just race one!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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mark chandler
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| posted on 5/9/08 at 03:19 PM |
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Its what you want to achieve really,a car thats really fast in a straight line and spins the wheels or is just really fast.
Have a google at some 750mc event results, you will see that 893cc blade engined westfields lap small circuits slightly faster than 4.0 v8 ones.
Long circuits with big straights this reverses and the v8's take over.
This does tend to be tweaked Rv8's so pushing around 250bhp compared to 130bhp BEC power.
Where they have 4.6 rv8s they are a little slower but then the later cross bolted engines weigh a little more.
Its LOCOST so if its free use it I say.
NB/ I had this dilemna a few years ago as I have a tweaked 4.6 on the floor from my earlier racing days, chose to go BEC as its ultimately cheaper
over a few years without compromise in performance.
Low tax class
Less wear on tyres
Sounds fantastic
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smart51
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| posted on 5/9/08 at 06:37 PM |
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quote:
Originally posted by NS Dev
Personally, I think a V8 is a waste of time and effort in a seven of any sort.
Too much torque for the wheels to make any use of, delivered at totally the wrong rpm to be of any use.
Personally I then think that MOST bike engines err too far the opposite way.
Yeah. A big bike engine with VVT to give more low end pull would probably be perfect.
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Fred W B
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| posted on 5/9/08 at 07:45 PM |
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Re RV8 mass, I posted the below ages ago
Cheers
Fred W B
Early Rover RV8 mass
Having found various posts on here re the mass of a Rover RV8 motor, which seem to disagree, thought I would weight the one I have in the garage.
It is a very early 3.5 motor from a P6, engine number 4550100886A, which was built between 1967 and 1976, according to www.rimmerbros.co.uk
The total mass, including starter (9kg!) , water pump, alternator, engine rubber mounts, inlet manifold and distributor came to 125 kg.
Note that the following were not included:
Standard Exhaust manifolds (5 kg each)
Flywheel to suit manual gearbox (14 kg)
Clutch (6 kg)
Carbs
Fan
Oil Filter
Oil
Water hosing
Water
So a complete motor with exhaust manifolds, flywheel and clutch but without other items mentioned above would weight 155 kg or say 340 UK pounds. (1
kg = 2.20462 pounds)
Cheers
Fred W B
You can do it quickly. You can do it cheap. You can do it right. – Pick any two.
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Simon
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| posted on 6/9/08 at 07:15 PM |
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Rover V8, you know it makes sense!
Right sound, good compromise on price and with injection and right gearing would be reasonable on economy too.
I did try and bring in some pics from my blog, which didn't work, so have a look at that instead - link at bottom of post
Hope this gives you some ideas!
ATB
Simon
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MakeEverything
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| posted on 8/9/08 at 01:22 PM |
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quote:
Originally posted by NS Dev
this includes a 720hp Ultima by the way, I do speak here from experience! )
Up to you though, we just race one!
Then youll already know that varying modifications on engines have different effects. such as a Supercharger, to increase low revs torque, which was
why i mentioned it originally. 
Thankyou all for your input. Im still completely undecided at the moment, and the views in the thread are mixed, and offer som excellent resource and
advice. Thankyou.
I was discussing the BEC idea earlier today with a friend "Tiger" Owner, and the subject of an Atom type kit was available, to utilise the
front end of a civic...??? Anyone know anything about it?
The objective for me, is to have something that is good allround, bearing in mind that top end is no good in the UK (Other than on a track officer...)
and accelleration is more fun, as is spinning the wheels at 70. I would commute the odd day, so it needs to be reasonably friendly and efficient -
both of which are achievable from a V8.
The V8 became an option because it was really cheap, though in all (Megajolt Injection, Headers, alu material for brackets, manifolds etc), probably
no more cheaper than buying a BEC power package i suppose, however the sound and torque from a RV8 is an addictive " nice to have".
Another option that i came up with today (to deal with the Road Tax issue here in the UK) was a three wheeler (one wheel at the rear)......
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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jamie1107
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| posted on 8/9/08 at 02:24 PM |
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if you want a big power v8 possibly one of the worst to go for is a rover they will never make over 300hp and bits cost alot you will also find almost
all the big bore blocks will have cracked a friend of mine has a shop next to a well known rover v8 tuner who have a constanty full skip of blocks
that are u s
if you really want a v8 then a chevy might be the way to go bits are cheep over 1000hp is achievable and they are rock solid but putting all that
weight in such a light car seems a bit of a shame big power plus heavy engine means it will turn in quicker than you can react
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