?s about high compression N/A Please share your knowledge and experiance

Post by **240sxorty** » Tue Mar 15, 2005 4:43 pm

I'm about to purchase 10.5 to 1 pistons in 89.5 mm overbore. I was wondering whether the stock head could handle it with out any serious work on the valves and such. Please share your experience.

Thanxs

Post by **Dattebayo** » Tue Mar 15, 2005 4:47 pm

Which engine are you talking about?single or dual cam?

Post by **Ajax** » Wed Mar 16, 2005 8:07 am

Considering there are premade aftermarket pistons for both e and de that are 10.5:1, I can't imagine any special work that would need to be done.I'm having some 10.5:1 custom made and I've talked with JWT who has tuned ecus to to work with 11:1- I doubt you'll run into problems. But I'm not a definitive source so you can't sue me if it goes wrong...

Post by **PandaS14** » Wed Mar 16, 2005 10:24 am

It depends on which cams you are running. If they have a large lift, the pistons might have to be flycut.

Post by **240sxorty** » Fri Mar 18, 2005 3:42 pm

Its a single cam 89 motor. I was told that I would have to get shot peened valves at 13-30$ a pop in addition to a head job. I'm also concerned about things such as the cam and whether I have to replace it for the higher compression as well as the ecu. What will I have to do with the ecu to avoid exloded condition. thanks Oh by the way. What is "fly cut"

Post by **corn322** » Sat Mar 19, 2005 12:25 pm

fly cut, I beleive, is when reliefs are cut into the top of the piston so the valves don't hit it.