KA-T Compression Ratio - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

kandyflip445 · 02-10-2003, 10:55 AM

What is the stock compression ratio on a KA? Also, has anyone built a KA-T and changed the compression ratio when buying new pistons? I think that, while lowering power due to less compression, it would benefit more because you could see higher boost with less chance for detination. Also, if it was a dish design wouldn't it be less prone to detonation? Anyone have any ideas/thoughts about this or something related?

EDIT: Um....I kinda f*cked up and put this in chat. I meant to put it in tech talk....so if any mod can help me out and stick this in tech thx.

d240t2 · 02-10-2003, 12:24 PM

9.5:1 is stock

I have seen motors built to 9.0:1 and 8.5:1. You loose a little low end torque and responsiveness...but you do gain some a higher detonation threshold, so you can make more power. You don't really gain on the geometry...since the stock pistons are dished anyways...there is just a larger dish.

Dennis

*Jeff240sx* · 02-10-2003, 01:35 PM

Yea... most of the nasty powered KA-Ts are running 8.5:1 CR. I will, Boosted is, Jay was, and I'm pretty sure Chris May was also.
-Jeff

02-10-2003, 10:55 AM	#1
kandyflip445 Post Whore! Join Date: Sep 2002 Location: Arden, NC Age: 40 Posts: 4,460 Trader Rating: (1) Rides Gallery: kandyflip445 Feedback Score: 1 reviews	KA-T Compression Ratio What is the stock compression ratio on a KA? Also, has anyone built a KA-T and changed the compression ratio when buying new pistons? I think that, while lowering power due to less compression, it would benefit more because you could see higher boost with less chance for detination. Also, if it was a dish design wouldn't it be less prone to detonation? Anyone have any ideas/thoughts about this or something related? EDIT: Um....I kinda fcked up and put this in chat. I meant to put it in tech talk....so if any mod can help me out and stick this in tech thx. Last edited by kandyflip445; 02-10-2003 at 11:00 AM..*

02-10-2003, 01:35 PM	#3
Jeff240sx I hate you too... Join Date: Jul 2001 Location: Tampa, FL Age: 42 Posts: 5,828 Trader Rating: (0) Rides Gallery: Jeff240sx Feedback Score: 0 reviews	Yea... most of the nasty powered KA-Ts are running 8.5:1 CR. I will, Boosted is, Jay was, and I'm pretty sure Chris May was also. -Jeff __________________ Whatup?

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02-10-2003, 12:24 PM	#2
d240t2 Zilvia Member Join Date: Mar 2002 Location: Atlanta, GA Age: 44 Posts: 205 Trader Rating: (0) Feedback Score: 0 reviews	9.5:1 is stock I have seen motors built to 9.0:1 and 8.5:1. You loose a little low end torque and responsiveness...but you do gain some a higher detonation threshold, so you can make more power. You don't really gain on the geometry...since the stock pistons are dished anyways...there is just a larger dish. Dennis