type r pistons with gsr

[95geser]

hey i would like to no if putting in the itr pistons in my gsr if they would make a diffrence in power not just reliability. does any one in here have them on theres and can give me some advice. thanks

[boosted k20]

right now ur compression ratio is about 10.0:1, with the type R pistons ur CR will be about 10.8:1

check this website out http://www.c-speedracing.com/howto/c...c/compcalc.php

u wont see too much gains but there will be some gains. not really worth the money IMO. get soem higher compression pistons like the JDM civic type R (P30 pistons) which will up ur compression to 11.5:1

[b18ls]

CTR pistons... yeah!

[whtteg]

Originally Posted by boosted k20

right now ur compression ratio is about 10.0:1, with the type R pistons ur CR will be about 10.8:1

check this website out http://www.c-speedracing.com/howto/c...c/compcalc.php

u wont see too much gains but there will be some gains. not really worth the money IMO. get soem higher compression pistons like the JDM civic type R (P30 pistons) which will up ur compression to 11.5:1

Actually the CTR pistons will bump him to 12.3:1 CR.

[gsr916]

the CTR pistons would not put him at 12.3:1!!!! he would need racing fuel if it did. that is over the amount of compression pump fuel can take! CTR pistons are put on GSR's quite often w/ no detonation. It would be less than stock CTR compression, so 11:1 or less.

[whtteg]

Originally Posted by gsr916

the CTR pistons would not put him at 12.3:1!!!! he would need racing fuel if it did. that is over the amount of compression pump fuel can take! CTR pistons are put on GSR's quite often w/ no detonation. It would be less than stock CTR compression, so 11:1 or less.

Nope sorry buddy but it would be in the 12.3:1 range. The B16B motor has a larger combustion chamber than the B18C1. Therefore the B16B pistons will bump him into the 12.3:1 range. It is true and accurate. You have it backwards, if you put stock B18C1 pistons in a B16B then they would bump the C/R higher than they would in the B18C1.

[95dxcivic]

Originally Posted by whtteg

Nope sorry buddy but it would be in the 12.3:1 range. The B16B motor has a larger combustion chamber than the B18C1. Therefore the B16B pistons will bump him into the 12.3:1 range. It is true and accurate. You have it backwards, if you put stock B18C1 pistons in a B16B then they would bump the C/R higher than they would in the B18C1.

Your wrong, if the b16b has a larger combustion chamber than the b18c1, then that means the compression is lower in the b16b, compression ratio is the volume of the combustion chamber volume at bdc(bottom dead center) divided by the volume of the combustion chamber volume at tdc(top dead center), therefore if the combustion chamber is larger then the compression ratio is lower.

P.S. You are right that the ctr engine has higher compression ratio, but not because it has a larger combustion chamber.

The type-r engines are made for N/A therefore they have higher comp ratio's than other honda engines.

[gsr916]

Originally Posted by whtteg

Nope sorry buddy but it would be in the 12.3:1 range. The B16B motor has a larger combustion chamber than the B18C1. Therefore the B16B pistons will bump him into the 12.3:1 range. It is true and accurate. You have it backwards, if you put stock B18C1 pistons in a B16B then they would bump the C/R higher than they would in the B18C1.

12.3 just seems too high. i looked online and a lot of sites say 12.3, some say 12.1... i guess it makes sense but seems like with a cr that high seems stupid to put them in a b18 for a daily driver... detonation is like synonomous with the grim reaper. o well whatever i was wrong, admitted...

[b18ls]

From my understanding, a CR of 12.3 on 93 octaine is still good. Please correct me if I'm wrong.

[gsr916]

if it is... thats freakin pushin it. that would be like where detonation draws the line

[knorwj]

According to boostedk20's calculator a stock b18c with b16b pistons yeilds a c/r of 12.042422511586594.


hopefully its not too high for everyday use as its just about what i'll be running once i get my build done.

[kornflakes28546]

i've seen these "JDM CTR pistons" on ebay for like $200. That seems insanely low price. I plan on getting some in the near future and I dont know if i should chance it. what would you guys do? http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW

[b18ls]

If it comes with rings and wrist pins, it's a good deal. You can get the Spoon balanced CTR pistons for about $125 more. It's not a great deal, but it's not bad either. If you get them and don't like them, I'll probly buy them off you.

[gsr916]

i bet they dont come with rings or pins

[whtteg]

Originally Posted by 95dxcivic

Quote: <HR SIZE=1>Originally Posted by whtteg
Nope sorry buddy but it would be in the 12.3:1 range. The B16B motor has a larger combustion chamber than the B18C1. Therefore the B16B pistons will bump him into the 12.3:1 range. It is true and accurate. You have it backwards, if you put stock B18C1 pistons in a B16B then they would bump the C/R higher than they would in the B18C1. <HR SIZE=1>

Your wrong, if the b16b has a larger combustion chamber than the b18c1, then that means the compression is lower in the b16b, compression ratio is the volume of the combustion chamber volume at bdc(bottom dead center) divided by the volume of the combustion chamber volume at tdc(top dead center), therefore if the combustion chamber is larger then the compression ratio is lower.

P.S. You are right that the ctr engine has higher compression ratio, but not because it has a larger combustion chamber.

The type-r engines are made for N/A therefore they have higher comp ratio's than other honda engines.

I meant to put it the other way, that was a typo and an error on my part of not proof reading. I am right about the C/R being higher than 11.1:1 in the GSR with B16B pistons. What I meant to say was that if you put the stock GSR pistons in a B16B the C/R will be lower than what it was in the GSR. Its the part in read that I just typed backwards, I was in a hurry LOL. But I am well aware of how c/r is calculated, static and dynamic.