Ragtag
New Member
OK, so when you say you have converted your V8 to SUs, converted from what? Strombergs, EFI? it would be helful to know. What vehicle is this in and was it the original engine. I ask this only because looking back, you have asked questions about a number of different vehicles.
On the face of it, sounds like you are close to starting but the timing is still out. You say you put the timing right but that is not possible until the engine is running. The best you can do with static timing is get it close enough to start.
I suggest you do three things.
1. Buy a can of Easy Start (V8 owners best friend)
2. Disconnect the fuel pump. Until you get it firing on easystart, pumping fuel is not helping as you will just flood the engine (damp plugs) making it even harder to start.
3. Mark the position of the dizzy relative to the timing case and then rotate back through about 10 degrees. Nip up the dizzy, squirt a good 4 seconds worth of easystart into the air intake and then try to start her up. If it doesn't fire, return the dizzy to the original position and then another 10 degrees further. Retry the starting procedure with easystart.
If you set the static timing close and you have a good spark, the engine will fire at some point within the 20 degree arc described. When you find that point, reconnect the petrol pump and get her started on petrol.
Once warmed up, set the timing properly using a timing light or vacuum gauge.
Good luck
Chris
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Ragtag
New Member
So you have an original 90 V8 EFI and you have changed to SUs. It will start on easystart but it won't start on petrol.
Did you change the fuel pump? An EFI fuel pump will be delivering fuel at about 10 times the pressure that the carbs can cope with.
Ragtag
New Member
Ragtags got brains!!!
I wonder if you can run it on easy start enough to check the timing?
and it could well be literally pouring fuel in through the carbs on the original fuel pump...
Hm thanks....I may put that in my signature.....if I could work out how to do it
Actually I am now trying to visualise a device to hook easystart cans onto the carbs to get a constant stream to run the engine. I guess I have invented FUEL INJECTION
Cheers
Chris
Mr Noisy
Coming in your ears.
Firstly, click quote on the bottom right of my post, then highlight and copy this when it comes up on the next page in plain text:
then at the top of your page, find and click "UserCP"
then on the left click "edit your signature"
right click in the dialog box and select "paste"
and then click "save" at the bottom.
that should be it
then at the top of your page, find and click "UserCP"
then on the left click "edit your signature"
right click in the dialog box and select "paste"
and then click "save" at the bottom.
that should be it
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Ragtag
New Member
3 to 4 Bar is 42 to 56 psi. So about 10 times the pressure required.
Ragtag
New Member
Hello Gromit,
I don't know much about 90 fuel tanks but I would have thought that the first consideration would be to obtain a pump that is an exact fit for the hole in the tank vacated by the EFI pump. If the 2.5 pump fits and you can get one cheap then give it a try.
I suspect that whilst it may deliver fuel at the right sort of pressure, it won't have sufficient flow to run twin carbs through the whole rev range but it may be ok at low revs. If it were me, I would talk to a supplier such as Paddocks and see what they can come up with that is designed for the job.
Cheers
Chris
