Furry
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 posted on 22/4/09 at 10:35 PM |
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running on 2 cylinders with sva just days away
hi everyone,
i'm running a crossflow wu=ith zx6r carbs and today i managed to get the car bto run and tickover however, it only runs on cylinders1 and 3. i
have tried changing plugs leads and compression test to no avail. can anyone think of any other ideas before i rip the bike carbs off and put the
original carbs back on, as i believe i will have to cancel the sva. has anyone presented running on 2 cylinders and what happened. test is on the 27th
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ReMan
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| posted on 22/4/09 at 10:47 PM |
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And are the two cylinders getting fuel at all?
Have you used any "start you bast*are" squirt on it?
Are you using a bike fuel pump?
Has the engine ever ran proper?
SVA would refuse to test probably/ fail on the donut test
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roadrunner
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| posted on 22/4/09 at 10:50 PM |
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If you cant get it running right and you still can get your car to the SVA, i would go most cars fail there fist attempt anyway, but at least you
would know what to put right for the re test and it would give you more time to sort your miss-fire and you would avoid the IVA test if you cancelled
now.
[Edited on 22/4/09 by roadrunner]
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stevebubs
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| posted on 22/4/09 at 11:25 PM |
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seconded - strip the carbs down and check for full movement of needles etc.
If you've spark, 90% certain this is likely to be the problem...
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stevebubs
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| posted on 22/4/09 at 11:26 PM |
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second question - you *do* have the leads on in the *right* order don't you.
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MikeRJ
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| posted on 22/4/09 at 11:53 PM |
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quote:
Originally posted by stevebubs
second question - you *do* have the leads on in the *right* order don't you.
An excellent point, especially as the crossflow has a slightly unusual 1-2-4-3 firing order.
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mad4x4
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| posted on 23/4/09 at 06:25 AM |
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Do you have spark at all four PLugs ?
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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02GF74
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| posted on 23/4/09 at 07:52 AM |
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You are using points dizzy and coil or EDIS/some other EFi?
anyways, remove all spark plugs. (makes it easier for engine to turn over).
for each lead, fit spark plug and hold against engine, turnn engine over and look for spark.
that would mostly rule out ignition.
check you have leads fitted correctly, firing order 1-2-4-3 and dizzy turns anti-clockwise.
put cylinder 1 (one nearest water pump) engine at TDC, compression (both vavles closed then look where the rotor arm is pointing.
rotate the dizzy (after undoing the clamp) so that it points at one of the ignition leasds inthe cap - that is lead 1.
then you would set timing to 10 degree BTDC.
if you need to know who to do that, I can write it up but my fingers are getting tired now...
if engine is still playing up, you need to check fuel.
get engine runningm, on 2 cylinders and then drip some petrol onto the fillter for the non-firing ones.
note - the exhaust will be cold for non-firing cylinders.
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britishtrident
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| posted on 23/4/09 at 08:13 AM |
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Firing Order
[Edited on 23/4/09 by britishtrident]
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Danozeman
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| posted on 23/4/09 at 08:23 AM |
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did it run on the standard carb?
Id go for firing order first. They have the non normal firing order as said above. Also which way round the cap did u go?
IIRC crossflows turn anti clockwise.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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mad4x4
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| posted on 23/4/09 at 11:45 AM |
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OK he has 4 Days to the SVA... (this includes a WEEKEND!)
What about a Local Crack Commando Locostbuilders Team vist said patient and get it running. Can;t let a Fellow builder suffer the IVA if we can help
it.
I would pop round but from scotland it;'s a tad to far.
[Edited on 23/404/09 by mad4x4]
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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paulf
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| posted on 23/4/09 at 06:44 PM |
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Are the carbs balanced correctly? if the carbs on 2 and 4 are completely closed it could be running on only the other 2 cylinders at idle .
Paul
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rusty nuts
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| posted on 23/4/09 at 08:28 PM |
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Carb diaphragms leaking? Firing order? fouled plugs? cracked distributor cap? air leak in manifold? Duff leads ? Just a few points to check
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Furry
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| posted on 23/4/09 at 10:26 PM |
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thanks guys. i decided to put the origonal 1600gt twinchoke back on as it ran fine on this before being stripped down. it now runs on 4 cylinders. i
would rather use the motorbike carbs but i can get those right after the test. many thanks for your help.
Furry
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mad4x4
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| posted on 24/4/09 at 05:19 AM |
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Glad to here you have a solution - Best of Luck(Wrong word ??SKILL) - What about some PRE SVA photos
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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02GF74
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| posted on 24/4/09 at 07:51 AM |
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sorted then, or as good as. 
you can strip the carbs down at you leisure.
don't poo poo the standard carb - still will be plenty fast enough. 
's nice when there is a back up plan that works. 
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