930 Overfueling now - distributor problem !
Discussion
Hi
It now seems that the overfueling problem relates to a Turbo 2 crank that was fitted when the engine was rebuilt last year. It's a 930 not a Turbo 2.
Basically the "worm" or gear that turns the distributor is turning the wrong way so it's sucking rather than blowing (or vica versa). So basically it's not retarding or advancing correctly. They got around the firing issue by changing the plugs around.
THe problem still remains that there seems no other way but the strip the engine down and change the gearing or replace the crank with a proper 930 crank.
We can't fit a Turbo disi because those are twins and the 930 can't run a twin.
Fairly pissed off about it - because all this time they've known that it was the wrong crank and that the disi was leaking oil because of it. But they didn't put 2 and 2 together about the fueling issue.
I've spent a least a grand on new Warm up regs reconditioned metering heads and £1000's on huge fuel bills. God knows what damage has been caused to the engine because of it.
Anyone got any ideas on this ?
Previous post
www.pistonheads.com/gassing/topic.asp?f=48&h=&t=43379
It now seems that the overfueling problem relates to a Turbo 2 crank that was fitted when the engine was rebuilt last year. It's a 930 not a Turbo 2.
Basically the "worm" or gear that turns the distributor is turning the wrong way so it's sucking rather than blowing (or vica versa). So basically it's not retarding or advancing correctly. They got around the firing issue by changing the plugs around.
THe problem still remains that there seems no other way but the strip the engine down and change the gearing or replace the crank with a proper 930 crank.
We can't fit a Turbo disi because those are twins and the 930 can't run a twin.
Fairly pissed off about it - because all this time they've known that it was the wrong crank and that the disi was leaking oil because of it. But they didn't put 2 and 2 together about the fueling issue.
I've spent a least a grand on new Warm up regs reconditioned metering heads and £1000's on huge fuel bills. God knows what damage has been caused to the engine because of it.
Anyone got any ideas on this ?
Previous post
www.pistonheads.com/gassing/topic.asp?f=48&h=&t=43379
You have exactly the same problem when you fit a 3.2 Carrera crank into a 930, so the problem is well known and a doddle to fix when the crank is out, all you have to do is pop off the circlip on the front, pull off the bronze dissy drive gear and fit the original. Shame it was not spotted at the time of the build.
The 965 does not use a twin dissy since they are single plug engines, I thought I had one of these somewhere but I cannot find it to look at.
You have an option to run with a contra-rotating distributor which can be specially built for you by someone like Aldon Automotive in the Midlands. If you supply them with the advance/retard curves, the dissy you have and the other spur gear to mesh with the existing crank they will do the lot for you at a very reasonable price.
The alternative is to fit any contra rotating distributor and use a digital controller to custom program the adv/ret curves, the advantage here being that you can map the ignition to suit any modifications you have done.
So, don't rip the engine apart just yet, there is hope!
The 965 does not use a twin dissy since they are single plug engines, I thought I had one of these somewhere but I cannot find it to look at.
You have an option to run with a contra-rotating distributor which can be specially built for you by someone like Aldon Automotive in the Midlands. If you supply them with the advance/retard curves, the dissy you have and the other spur gear to mesh with the existing crank they will do the lot for you at a very reasonable price.
The alternative is to fit any contra rotating distributor and use a digital controller to custom program the adv/ret curves, the advantage here being that you can map the ignition to suit any modifications you have done.
So, don't rip the engine apart just yet, there is hope!
Hi Chris
Basically i'm fcuked. There's no way I'm letting them do anything with the car now. It's a complicated story but the guy who used to own the place isn;t there anymore and the work stretches over that period.
The problem really is, what damaged has been caused to the engine whilst it's been running like that. Ring and piston wear is going to be a real concern - considering it's been 7 months ! It's been back a dozen times in that time frame.
I doubt the company will be around long enough to go the legal route - going to have to cut my losses and go somewhere else. It's cost me so far a good 2k and and dropping out the crank and checking the wear will cost another easy 2k.
Basically i'm fcuked. There's no way I'm letting them do anything with the car now. It's a complicated story but the guy who used to own the place isn;t there anymore and the work stretches over that period.
The problem really is, what damaged has been caused to the engine whilst it's been running like that. Ring and piston wear is going to be a real concern - considering it's been 7 months ! It's been back a dozen times in that time frame.
I doubt the company will be around long enough to go the legal route - going to have to cut my losses and go somewhere else. It's cost me so far a good 2k and and dropping out the crank and checking the wear will cost another easy 2k.
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