AFR 205 or 225????
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Originally Posted by PewterZ28
Tony,
Thanks for the clarification on the 205's vs. the 62cc 225's.
Is it true you shouldn't mill the 225's? Just curious because I'm looking for a compression ratio around 11.2:1 ~ 11.5:1 and I'm just wondering how I'm going to get there if the 225's can't be milled.
Thanks,
Derrick
Thanks for the clarification on the 205's vs. the 62cc 225's.
Is it true you shouldn't mill the 225's? Just curious because I'm looking for a compression ratio around 11.2:1 ~ 11.5:1 and I'm just wondering how I'm going to get there if the 225's can't be milled.
Thanks,
Derrick
Originally Posted by TONY MAMO
AFR 225 come "standard" with 72cc (currently available) or 62 cc (a month or so out).
Obviously any "standard" chambers can be milled accordingly for less volume to dial in your exact combination for the compression ratio you desire.
Obviously any "standard" chambers can be milled accordingly for less volume to dial in your exact combination for the compression ratio you desire.
Yep. I just got off the phone with Tony. Just in case anyone is also wanting to stay with the stock cubes for now but increase the displacement in the future, here's what Tony said... (good info for anyone making a search in the future):
The 62cc 225's can be milled 0.018"~0.020" to get you to 59cc. Then with some flat top fly cut pistons and a Cometic gasket 0.040" thick, the compession ratio would be 11.27:1.
If/When you want to increase displacement you would have to get some dish shaped pistons to bring the compression ratio back down to the 11.2~11.5:1 range. He also said something about having part of the pistons flat because of quench but I don't think I wrote that part down correctly.
Thanks again, Tony!
The 62cc 225's can be milled 0.018"~0.020" to get you to 59cc. Then with some flat top fly cut pistons and a Cometic gasket 0.040" thick, the compession ratio would be 11.27:1.
If/When you want to increase displacement you would have to get some dish shaped pistons to bring the compression ratio back down to the 11.2~11.5:1 range. He also said something about having part of the pistons flat because of quench but I don't think I wrote that part down correctly.
Thanks again, Tony!
Thread Starter
Staging Lane
Joined: Mar 2002
Posts: 76
Likes: 0
From: North Dallas
Thanks for the info. I am going to wait for the 225's with my G5x3 and a set of 921 springs should make for a great combo. I also plan on doing the Fast 90 with the NW 90 TB. LG and others have already gotten over 480 with the 205 with this setup in a Z06 so I am sure I will be close to my magic number of 500 rwhp and 450 ftlb with the 225's
