compression delima

[ianmaxtec]

The compression in my engine is too high (as a result of skimming and a re-boar). I have tried everything to prevent pinking, but no joy. The maximum pressure should be 180psi, and I am getting 195psi. I am considering a de-compression plate, and was wondering has anybody tried one of these?
 (Cannot offset the timing any more or the car wont run, checked the advance weights in the distro, they are fine, tried all sorts of octane additives, none work with the exception of Millers oil, which lifts the octane rating by 2 points, and does help reducing pinking, not interested in 2 head gaskets, as there is no guarantee they will seal)

Any suggestions would be welcome..

[raferackstraw]

what about using shell v max? fuel

[ianmaxtec]

I have tried all available fuels (In Ireland), and none really make much difference unless you add the octane "booster"

[danny_p]

barking up the wrong tree.

you have good compression but it's not excessivly high i've run higher without issues,  check your fueling to me it shounds like the motors not quite getting enough fuel  or possobly it has the wrong grade of spark plugs in

[ianmaxtec]

As far as I know there are no fuel problems, and the spark plugs are correct. Just to recap: if i run the car without a "octane booster" it pinks so much I am afraid to drive it (for fear of damage). I have tried different fuels, adjusted the timing to the point the car will not run..........the only way I can avoid pinking is to add "octane booster". The car used to pink now and again, and when I rebuilt the engine (head skim and re-boar) the pinking got much worse. There is loads of power, which I thought would rule out the possibility of fuel issues, the spark plugs are a brownish colour, and are the correct type. I also checked the advance weights in the distro (dizzy) and they are fine, as are the springs. What kind of PSI were you running your car on Danny?

[Mr Blue]

What engine? I used a vernier pulley on mine when the head was skimmed to the max. Sorted my annoying timing issue.

[ianmaxtec]

8 valve k-jet engine, engine code EV...........PLEASE EXPLAIN MORE MR BLUE

[Bandit127]

I would try going cooler on your spark plugs by a couple of grades. You might have the right plugs for your engine - but that is probably at normal compression. With the increased compression they could be running too hot.

Just been surfing on it - and retarding the timing helps to reduce it. If you have been advancing it, try going the other way.

The vernier pulley will help dial in cam (valve) timing - do you suspect yours might be out? It won't help with ignition timing.

[molegti]

I believe because the distance between the crank and cam will have been shortened by a heavy skim the valve timing will be out

[molegti]

Should have added but less than a tooth hence the possibleneed for a vernier. I could be wrong though.