mini cooper 1968
Discussion
got a problem with the engine on my car almost finished restoration this is the last hurdle or i hope so
have trouble starting and when it does eventually start it misfires
after running for about 3 mins runs ok
have checked compressions all seem good but when engine runs take off each h t lead in turn 1 and 2 seem to make least difference in running
i even tried piston seal on these cylinders but no difference
HELP PLEASE thanks andy
have trouble starting and when it does eventually start it misfires
after running for about 3 mins runs ok
have checked compressions all seem good but when engine runs take off each h t lead in turn 1 and 2 seem to make least difference in running
i even tried piston seal on these cylinders but no difference
HELP PLEASE thanks andy
Have you balanced the carbs properly? Is one carb dashpot sticking?
Check the dashpots by taking off the air cleaners, lifting each dashpot right to the top at the same time. Let go of each dashpot simultaneously and they should drop at the same ratre. You will hear the dashpot hit the bottom of the carb with a slight metallic clunk. If they don't drop together, then that couold be the problem. Polish out the dashpot covers with metal polish or, if that doesn't work, check that the jets are centralised. Balance the carbs as well. Ask here if you've never done that.
To really show the sort of symptons you describe, the offending cylinders/pistons would have to be very low on compression if compression is the issue. Ideally you should be seeing c.125 psi plus on all cylinders, so on an older engine anything above about 115 should run OK, even if it does smoke a bit then.
Take the oil filler cap off whilst the engine is running and check for 'blow-by', i.e. smoke puffing out of the filler cap.
In respect of the poor starting, check that you have enough static advance. It should be 7 deg BTDC with a standard dizzy on a 998 Cooper.
I hope this helps.
Come back on here if it doesn't.
Peter
Check the dashpots by taking off the air cleaners, lifting each dashpot right to the top at the same time. Let go of each dashpot simultaneously and they should drop at the same ratre. You will hear the dashpot hit the bottom of the carb with a slight metallic clunk. If they don't drop together, then that couold be the problem. Polish out the dashpot covers with metal polish or, if that doesn't work, check that the jets are centralised. Balance the carbs as well. Ask here if you've never done that.
To really show the sort of symptons you describe, the offending cylinders/pistons would have to be very low on compression if compression is the issue. Ideally you should be seeing c.125 psi plus on all cylinders, so on an older engine anything above about 115 should run OK, even if it does smoke a bit then.
Take the oil filler cap off whilst the engine is running and check for 'blow-by', i.e. smoke puffing out of the filler cap.
In respect of the poor starting, check that you have enough static advance. It should be 7 deg BTDC with a standard dizzy on a 998 Cooper.
I hope this helps.
Come back on here if it doesn't.
Peter
That could be the needles and/or the timing, assuming you have disconnected any direct linkage between the two carbs and balanced them at tickover. (Email me if you haven't balanced them with linkage disconnected).
What you really need to do is to drive it around for a few miles to settle it all down, then book a rolling road session with someone who really knows the 'A-Series' engine. What needles are you currently running?
I've just seen that you ae in Spain, so that could be a bit of a problem.
What you really need to do is to drive it around for a few miles to settle it all down, then book a rolling road session with someone who really knows the 'A-Series' engine. What needles are you currently running?
I've just seen that you ae in Spain, so that could be a bit of a problem.
Gassing Station | Classic Minis | Top of Page | What's New | My Stuff