i just got my hands on a free b16a1 block with a gsr head and i was wondering if there is any difference in the compression ratio if i bolt em up. i would imagine there being a change but i havent found anything concrete on it.
thanx a lot
scott

 

EDIT forget that, after 2 seconds of searching... found that to be false...

 

heres some info i just found in another thread:

https://honda-tech.com/zerothread?id=545387


It'll work fine and your compression will wend up at about 11.5-11.8:1.

b18c1 GSR's P72 head has a squared combusion chamber, where the b16a is circular and slightly larger volume, so with the b18c1 head, the compression is slightly higher than a b16a/ITR PR3 head.

 

following that logic, if you did it the other way around, youd lower the compression, and also have more low end torque... just my .02

 

dood, you're crazy.. three posts in like 10 min. they were helpful tho. but that sucks for me cus the block needs to be decked and im planning on turboing it. i guess ill just have to get some 8:1 pistons or something to make it work. i guess thats just what you have to do when you get free stuff.
thanx for the info.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by doublethink &raquo;</TD></TR><TR><TD CLASS="quote">following that logic, if you did it the other way around, youd lower the compression, and also have more low end torque... just my .02</TD></TR></TABLE>

Lowering compression decreases low end torque.

 

hey i have the setup but with a b16a2 and gsr head and my compression at 10.44 And displacement at 1587.31cc. And its quick.

 

http://www.c-speedracing.com/h...c.php

 

dont run low compression pistons and dont listen to idiots on here who give you their version of the answer they learned by reading HondaTuning.

detonation is caused by pockets of fuel around the cylinder walls and in the recesses of poorly designed combustion spaces that reach the autoignition temperature prior to the flame front compressing and burning them. they simultaneously autoignite *ping* and there you go. the gsr head has flat quench pads vs the b16's recessed onces and is the best designed chamber honda made. dont buy some shitty low comp. generic pistons to screw it up. deck your block so the pistons will have no less than .035" clearance from the head and run it. youll be happy. if you must buy new pistons, endyn rollerwaves are the only ones IMO designed to work perfectly with the heads quench areas. you wont regret it.

 

yeah, after reading those posts again i realized that the one guy had ctr pistons in there and thats why his comp was prolly so high. i figured it would raise the comp a little so i will prolly buy the new pistons one step down at 9:1 i will deff be going with arias or even rollerwave pistons if i can afford em. if i went with the 9:1 pistons, would you recommend using flat top valves? they are supposed to bump the comp ratio up .3 and they move the quench area away from the head...
BTW, how much is larry asking for a set of pistons nowadays?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike_belben@yahoo.com &raquo;</TD></TR><TR><TD CLASS="quote">dont run low compression pistons and dont listen to idiots on here who give you their version of the answer they learned by reading HondaTuning.</TD></TR></TABLE>

hey now i just quoted another thread, not claiming to be some expert here on quench pads....