I have been suffering with what I call a "compound problem" on my 71 2000 SC. Just so we're all clear my car has a Pertronix fitted and is on standard carburation and compression. I run with std unleaded fuel with Castrol Valvemaster Plus at the recommended dosage.
Basically I've been chasing my tail trying to get the car to run correctly throughout the rev range, I can get it to idle nice and smooth but it will be flat in power through the revs OR I can get a spluttery lumpy idle which runs nicely through the revs.
From there I tried to play with the timing which with more advance added more go through the revs but pinks under load or if I back it off to stop the pinking it goes flat again in the power.
It also occasionally sounds like it's on 3 and coupled with the horrid power delivery that could very well be the case, richen it up and this seems to go away but then after a while the effects of running rich come into play with misfiring etc.
I've then messed with the timing with the fuelling as described above which helps temporarily but after a time it will either go flat in the power department or will go all lumpy low down.
Prior to all this I also "centralised" the dizzy on 4deg so the timing twiddler had an equal amount of travel each way but strangely prior to this centralising the twiddler had been fully advanced and the dizzy then set to 4deg it ran and accelerated much happier :?: Does the advance curve change with the twiddler?
maybe you can see how I've been going in circles here?
Can anyone throw me a line here please? My sanity and I would be most appreciative
thanks
Basically I've been chasing my tail trying to get the car to run correctly throughout the rev range, I can get it to idle nice and smooth but it will be flat in power through the revs OR I can get a spluttery lumpy idle which runs nicely through the revs.
From there I tried to play with the timing which with more advance added more go through the revs but pinks under load or if I back it off to stop the pinking it goes flat again in the power.
It also occasionally sounds like it's on 3 and coupled with the horrid power delivery that could very well be the case, richen it up and this seems to go away but then after a while the effects of running rich come into play with misfiring etc.
I've then messed with the timing with the fuelling as described above which helps temporarily but after a time it will either go flat in the power department or will go all lumpy low down.
Prior to all this I also "centralised" the dizzy on 4deg so the timing twiddler had an equal amount of travel each way but strangely prior to this centralising the twiddler had been fully advanced and the dizzy then set to 4deg it ran and accelerated much happier :?: Does the advance curve change with the twiddler?
maybe you can see how I've been going in circles here?
Can anyone throw me a line here please? My sanity and I would be most appreciative
thanks