Originally Posted by
micheal8042
two problems with 86mm bore is that there only two types of off the shelf pistons 13.5 or 15.5. using a comp.calculator 13.5 comp piston with 8.75cc dome 89mm stroke and piston with a out of the hole value of .030 with type r head and cams -----net compression 11.946 trying to stay on pump gas!!
So you don't, in fact, have 13.5:1 compression, which is what we thought.
Originally Posted by
micheal8042
i have been tuning for many years and have many cars out there that i have tuned 10/1 comp turbos,turbo sohc /dohc and have built so many i cant remember them all- 500hp to 270hp turbos and 170hp sohc up to 255 hp all motor dohc to answer jarrods smart ass reply which i am sure dont know shit.
You should have no problems getting this running then, and no need to ask questions like you did. I don't think you're the gold mine of tuning knowledge that you claim to be. That's not a bad thing, and it's ok to admit when you need help. Many people on here tune your type of setup fairly regularly, and don't have any problems, which is why we're puzzled.
Originally Posted by
micheal8042
heres where im having fun - when i check compression with a gauge ,im
coming up with 290-295 with two cycles and i think my problem is im out of pump gas range
You're still within pump gas range at 11.946:1. It's all in the tuning. If you aren't getting detonation/pre-ignition problems, you're still fine. That doesn't sound like the problems you're having. You should get someone to look a that leaning out issue though.
Originally Posted by
micheal8042
also you have to retard camshafts the further they are spaced from the crankshaft or else they will be overly advanced
Cam to crank distance has nothing to do with it, all that matters is the deviation from the stock spacing. You could make a block with a 30" deck height and it would run with the same cam timing as your engine. You only need to adjust if you change the headgasket thickness an appreciable amount from stock. It's just simple geometry based on the fixed angle tooth spacing.