I posted this in tech as well because I wasn't sure where to do it. I am trying to decide whether I should bore my ZC block .02 (.5mm) over with my turbo setup. I am weighing between the advantage of having a clean bore for 75.5mm pistons and the fact that I am loosing material that would help with strength. I will be boosting between 10-12psi. I can use 75mm pistons, but I already have 70K on my ZC (D series) block, and I am concerned that the exsisting wear is enough to create a less than perfect seal. All opinons are welcome. Thank you


[Modified by azulito, 4:35 PM 2/6/2003]


[Modified by azulito, 4:35 PM 2/6/2003]

 

Have you been boosting on your stock cylinders? If so, you probably need to bore to get good ring seal again. Not sure how that can affect the strength of your stock bore, however. You certainly would not want to go any larger than 75.5mm on a boosted block.

 

Yes there is about 10k boosted miles on the non-built block already with a 92-95 greddy kit. I am switching to an Apexi kit and building a bit (rebuilt head P&P, JE 9.1:1 pistons with stock 75mm bore or the same with 75.5mm bore, eagle rods, zdyne ecu and 450cc injectors, walbro fuel pump)

I have been leaning towards getting it bored to get a good seal but started to be concerned with the strength of the block @ 12 psi. I think it will all be OK with the proper tuning, but I wanted to see if some others had an opinon on this from experience.