Hello new here..
I hope i can answer your questions since i have used and i also sell these pistons. Even though here these pistons have been used for years (5+yrs) i belive it is a new thing to the USA guys. I introduced this idea of using these pistons and was somewhat critisized but now the opinions are different since ppl have started to see how well these pistons work.
YCP is a company that do replacement pistons for different cars.. The pistons you are refering to as being 8.5:1 CR are Vitara pistons(made by Y.C.P).. these pistons will fit into D series Honda motors and will provide great performance for boosted applications at a fraction of the cost of forged nes.
The have produced reliably up to 416whp on d16 boosted setups and they respons great to boost. Check out
JFK78 and
fast2camciv setups in Honda-tech or at turbod16.com or at d-series.org. Both setups have 400+whp on these pistons..
In my particular car i achieved 266whp and 240lbs/ft on 93octane with a elatively small turbo(T3 super 60) with a Non vtec D16y7 setup. I ran 12.4 @ 111mph with full interior,full exhaust and 93octane in the tank..I ran my car daily at 18PSIs w/o any problem.
What makes these pistons special? They are made of a much more stronger cast than regular OEM pistons, they are T-6 heat treated which helps them in being strong, they have a special coating that helps fight against heat, friction and detonation..They also have better ringlanda than OEM pistons and double oil holes for a better lubrication.. And the best is that these pistons have a Floating wrist pin design which makes them easy to install on aftermarket rods such as Eagle, TT, SCAT etc...
The compression rati varies depending on what head combination you use and what head gasket thickness.
In my setup i used the pistons with eagle rods.
For any other questions fell free to ask me or email me-->
ekhatchback99@hotmail.com