leon51274
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| posted on 26/2/10 at 09:50 AM |
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Twin 40 manifold
Morning
Hoping for some help please. Went to put my twin dellorto dhla 40's on my 1600 crossflow yesterday and they don't fit! I replaced the
dizzy cap with a side entry one and the manifold is still catching it. The manifold is very short at 3" so i'm thinking that this my
problem as they originally came off a lotus twin cam, before i go splashing more cash can someone confirm to me that a 4.25" long manifold will
sort my problem?
Many thanks
Leon
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mcerd1
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| posted on 26/2/10 at 10:04 AM |
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have you considered electronic ignition? (e.g. megajolt)
that way you wouldn't need a dizzy at all and you can tune a progamable electronic one better than any dizzzy
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02GF74
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| posted on 26/2/10 at 10:49 AM |
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there are at least 4 types of manifold.
short and long and come in two angles (I think one is horizontal else is less steep but don't quite me on that)
generally the ones that are angled are for the 1300 block to raise carbs to clear the dizzy.
I have 2 spare angled manifolds, short one that was used on 1600 block with side entry cap and long one that is identical to the one on my 1300 block
- I had Ford dizzy with normal cap but with small lead covers that allow the leads to bent round to clear the manifold.
so if you have 1600 block, then the angled one ought to be fine as it was fine on my 1300 block.
If you are using Bosch dizzy, you are gonna struggle more since that is taller than the Ford one.
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leon51274
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| posted on 26/2/10 at 11:45 AM |
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ok, cheers men.
Well the manifold is a short angled one and i'm using a bosch electronic ignition so it sounds like i'm buggered, How much will a megajolt
system set me back?
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mcerd1
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| posted on 26/2/10 at 12:10 PM |
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£90'ish for a built MJ unit
+£20'ish for a trigger wheel
+£30-50 for the donor bits -> EDIS4, coilpack and a VR crank sensor - all with plugs + wires
(can be very cheap if you get them from the scrayard)
+ a TPS sensor for the carbs if you want a 3D map (or a MAP sensor, but its harder to set this up on multiple carbs)
so it should be cheaper than an aftermarket dizzy
I managed to get all of that for £130
inc. the whole loom from the donor which managed to get out whitout cutting any wires (my donor was a k reg 1.3 escort btw)
(not including a TPS - my bike carbs had one already)
I got the MJ itself as a built unit from Paulf on here - might be worth sending him a PM to see if he still does them
this link has loads of info on how to do it: linky
(links a little old now, but still gives you the idea)
[Edited on 26/2/10 by mcerd1]
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norfolkluego
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| posted on 26/2/10 at 12:34 PM |
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Two things.
1. You can get a complete Crossflow Megajolt kit from Trigger Wheels that will have everything you need but will cost the thick end of £300. Sourced
separately you should be able to knock £150 off it.
2. We've just done an engine change from a Crossflow with twin DHLA 40s and had no problems mounting the carbs. the manifold was angled upwards,
I'll find a picture of it when I get home
[Edited on 26/2/10 by norfolkluego]
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britishtrident
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| posted on 26/2/10 at 12:40 PM |
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Lotus twincam's didn't have inlet manifolds.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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leon51274
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| posted on 26/2/10 at 12:46 PM |
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could it be that the bosch dizzy is just too big? Are lucas ones shorter?
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Fatgadget
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| posted on 26/2/10 at 01:05 PM |
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quote:
Originally posted by britishtrident
Lotus twincam's didn't have inlet manifolds.
I think what he is saying is the Dellortos came off a twink.
Dellortos as far as I remember have accelerator pump underneath. It would tally with the installation issues. making them more likely to foul the
dizzy on a xflow than Webers
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leon51274
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| posted on 26/2/10 at 01:12 PM |
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quote:
Originally posted by norfolkluego
Two things.
1. You can get a complete Crossflow Megajolt kit from Trigger Wheels that will have everything you need but will cost the thick end of £300. Sourced
separately you should be able to knock £150 off it.
2. We've just done an engine change from a Crossflow with twin DHLA 40s and had no problems mounting the carbs. the manifold was angled upwards,
I'll find a picture of it when I get home
[Edited on 26/2/10 by norfolkluego]
A pic would be good, cheers mate
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mcerd1
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| posted on 26/2/10 at 01:19 PM |
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one more thing - if you went for MJ or similar you'll need something to blank the dizzy hole
there was a thread a wee while ago which I can't find - but this is the sort of plug you'd need
 
X-Flow dizzy plug
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02GF74
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| posted on 26/2/10 at 01:43 PM |
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^^^^ is correct, the lotus twin cam had the "manifold" as part of the cast head.
yes, the Bosch is taller than the Ford unit.
dellortos have the fuel pump levers below but as I said earlier, I had pair of 40s on a 1300 crossflow with enough clearance so nothing got fouled
albeit on the long manifold.
I have a Bosh as Ford distritbutor spare too.
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Fatgadget
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| posted on 26/2/10 at 01:43 PM |
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quote:
Originally posted by mcerd1
one more thing - if you went for MJ or similar you'll need something to blank the dizzy hole
there was a thread a wee while ago which I can't find - but this is the sort of plug you'd need
X-Flow dizzy plug
A locost solution would just be a blanked off old dizzy no?
[Edited on 26/2/10 by Fatgadget]
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02GF74
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| posted on 26/2/10 at 01:47 PM |
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a plug is very sophisiticated - I reckon you could drill one or two holes and bolt down a plate over a gasket - there already is one hole for the
distributor clamp.
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pajsh
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| posted on 26/2/10 at 02:08 PM |
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Deffo go MJ. More reliable and adjustable.
I cut the top off the dizzy, made a cap for it and mounted the coil pack on top.
 
Pinto 2.0 - 2
I used to be apathetic but now I just don't care.
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02GF74
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| posted on 26/2/10 at 02:34 PM |
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^^^ yeah, but that is not a crossflow but a pinto - doesn't it use the distributor to turn the oil pump round hence you cannot remove it?
Pretty sure someone on here did that and found here was no oil pressure 
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mcerd1
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| posted on 26/2/10 at 02:41 PM |
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I've actually got a cut down dizzy for my own pinto, but as above it wouldn't be much good without it 
but the plug is actually quite locost - if you've got access to a lathe  
even if you don't it'll only cost a few £ to get made
(I recon the one in the pic cost me £6 for the material and postage)
but pajsh's solution is also good, if you've got the space:
quote:
Originally posted by pajsh
I cut the top off the dizzy, made a cap for it and mounted the coil pack on top.
btw - there are 2 types of coilpack - the early ones are the ones you'll find in the same donor as the EDIS4 etc..
and the later ones are on the newer zetec's and so on
only significant difference between them is the plug's on the coilpack end - if you get the early ones then you can get std. plug leads off the
shelf with the right ends on them
(if you use a later coil pack all the std. leads have the big rubber boots on the spark plug end for the 16v engines)
[Edited on 26/2/10 by mcerd1]
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pajsh
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| posted on 26/2/10 at 02:59 PM |
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quote:
Originally posted by 02GF74
^^^ yeah, but that is not a crossflow but a pinto - doesn't it use the distributor to turn the oil pump round hence you cannot remove it?
Pretty sure someone on here did that and found here was no oil pressure
True enough it is still needed for the oil pump. The idea still applies though.
I used to be apathetic but now I just don't care.
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leon51274
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| posted on 26/2/10 at 04:14 PM |
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Not sure i've quite got the cash for the megajolt nor the savvy to get the bits from a scrapy.
Suppose its down to if a longer manifold will sort the job and/or different dizzy!
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mcerd1
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| posted on 26/2/10 at 04:56 PM |
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have you just got a standard dizzy at the moment or has the vacume advance been taken off ?
[Edited on 26/2/10 by mcerd1]
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leon51274
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| posted on 26/2/10 at 05:08 PM |
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quote:
Originally posted by mcerd1
have you just got a standard dizzy at the moment or has the vacume advance been taken off ?
[Edited on 26/2/10 by mcerd1]
Its a standard bosch electronic setup with vac advance which i was just going to block off. I've just had another look and the flange nearest
the carb is catching on the top ht plug so i'm thinking a longer manifold will sort it.
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mcerd1
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| posted on 26/2/10 at 06:04 PM |
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its your choice, but you might want to keep MJ in mind for future upgrades - with a 3D map it should give you a few extra MPG and a better throttle
responce than the dizzy
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norfolkluego
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| posted on 26/2/10 at 10:37 PM |
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Pics as promised
 
Rescued attachment e3.jpg
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norfolkluego
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| posted on 26/2/10 at 10:39 PM |
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Not a huge amount of clearance and the manifold need to be angled up
 
Rescued attachment e1.jpg
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norfolkluego
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| posted on 26/2/10 at 10:47 PM |
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Looking at the pics I would say 02GF74
is right, if the manifold was any shorter the fuel pump levers would foul the dizzy cap, answer would seem to be longer manifold.
[Edited on 26/2/10 by norfolkluego]
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