I have a b18c block with ctr pistons, skunk2 stage 2 cams, skunk2 itm, bdl throttle body...currently im running the b18c head, but i also have a b16a head sitting in my garage...i have been told a couple different things about which one to use, just want to hear some ups n downs from the HT peeps....also, whats technically the highest i can rev out a b18c with the b18c head without causing trouble?>

 

if you throw the b16 head on there your compression will go down slightly and it will be called a poor mans type r because the b16 head is basically the same as the type r's but a downgrade if thats what you want to call it...i say keep the head b18c head on and build up the b16 or vice versa

 

Not to thread jack and sorry if this is an obvious answer but.....

Why would he lose compression with a B16a head?

Would this be the same for a LS/V setup; loss of compression if using a B16 head?

 

yes you would lose comp with an ls/v and b16 head

 

you make a tad bit less compression with the b16 head beacsue the combustion chamber volume in the head is slightly larger therefore makes less compression then the gsr head..

but on the other hand the gsr head makes more compression but does not flow as well. as it is not a huge difference, b16 head flows air..

what i would do is get a b16 head and mill it to make up for the compression..
thats what i have on my lsv setup.. its milled like .036"
works good

good luck

 

you dont really wanna rev any higher then stock.. you need to pick yourself up some valvesprings..

 

when u say b18c i assume ur talking about jdm itr head, so therefore, u wouldnt lose any compression by switchin to a b16 head(hence they are the same casting). and i would recommend sticking with the b18c head because it already has the stock port job on it.

 

Couldnt u just run a thinner head gasket for the b16 head to make up for the lower compression? Im no expert just figured i would throw that out.

 

why the hell would you want more compression on a motor that has over 12:1 compression anyway?

thats plenty high enough for the street in my opinion. maybe even too high. ctr pistons in a gsr block with a gsr head is WAY over 12:1. there is a thread on here that shows compression ratios of many different block/head combinations with ctr pistons.

even with the b16 head on the gsr block with ctr pistons you are looking at over 12:1.

i wouldnt even start that motor without tuning, let alone rev it to 8 or higher.

 

No, i am running a JDM gsr block and head. The compression is 13 to 1. I run 100 octane at all times.

 

in our drag car we used the b16 head @ first made okay power 235whp when we switched to the GSR with a lot of porting made huge power almost 300WHP

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by authority1 &raquo;</TD></TR><TR><TD CLASS="quote">in our drag car we used the b16 head @ first made okay power 235whp when we switched to the GSR with a lot of porting made huge power almost 300WHP</TD></TR></TABLE>

i have a feeling that had something to do with the power jump. btw, all u did was port the gsr head and jumped 65whp or did u upgrade cams, etc?

 

i doubt that all he did was use a ported gsr head. im just a little skeptical about the fact that this motor is putting out almost 300 to the wheels and also the fact that using that head gave him 65whp. i dont see that happening.

 

for as far as i know the gsr head has the best flow and i believe it also has shorter chamber volume which gives better compression the the 16 or c5. ???

 

https://honda-tech.com/zerosearch

*leaves thread*

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NA_B18C1 &raquo;</TD></TR><TR><TD CLASS="quote">for as far as i know the gsr head has the best flow and i believe it also has shorter chamber volume which gives better compression the the 16 or c5. ???</TD></TR></TABLE>

this is incorrect. brad from rlz but a stock b16 head on a flow bench and it flowed about 3 more cfm than a stock gsr head. (not that 3 cfm makes that much of a difference) just stating the facts