ok i have a B18C (GSR JDM) but i want more CR but dont want to buy pistons my question is, if i get a MUGEN 2 layer headgasket will i get the 11: 1 cr???
also has anyone ever used omnima Valves

 

Mugen headgasket will bump compression by around 0.3, and the same goes for flat face valves.

 

aftermarket headgasket, deck the block or increase the bore size.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Pondus &raquo;</TD></TR><TR><TD CLASS="quote">Mugen headgasket will bump compression by around 0.3, and the same goes for flat face valves.</TD></TR></TABLE>

I think that high compression valves yield around .3 as well. You would have around .6ish more with just head gasket and valves

 

The first question is why do you want higher compression? What do you plan on doing that will benafit from more compression?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EKhatch &raquo;</TD></TR><TR><TD CLASS="quote">The first question is why do you want higher compression? What do you plan on doing that will benafit from more compression? </TD></TR></TABLE>

Higher compression leads to more hp. I would assume thats why he wants more compression.

 

in general high hp cams need higher compression to operate well. plenty of other people on here can give you a more scientific answer im sure.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Power Rev Racing &raquo;</TD></TR><TR><TD CLASS="quote">Higher compression leads to more hp. I would assume thats why he wants more compression.</TD></TR></TABLE>

just like if you rev higher you get more horsepower right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Power Rev Racing &raquo;</TD></TR><TR><TD CLASS="quote">

Higher compression leads to more hp. </TD></TR></TABLE>

Taken as a general statement then you are right on a technicality. If you think it's worth while to run a thinner headgasket in an otherwise bone stock B-series then have at it.

 

higher compression isnt gonna do **** on a stock motor , just like people think advancing timing gains horsepower . if the cames arnt designed for higher compression , than its not worth it. im sure you wont see a dyno difference with a spoon or mugen headgasket on a stock motor.

 

I was kinda interested in this as well. I was looking at the gasket and the valves as alternatives to milling the head. assuming this would equate to an increase of .6 would that be beneficial with ITR cams or s2s1 (would s2s2 be ok with that compression?)

thanks,

YV

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by youngvedder &raquo;</TD></TR><TR><TD CLASS="quote">I was kinda interested in this as well. I was looking at the gasket and the valves as alternatives to milling the head. assuming this would equate to an increase of .6 would that be beneficial with ITR cams or s2s1 (would s2s2 be ok with that compression?)

thanks,

YV</TD></TR></TABLE>

This is just my opinion but if you are willing to spend the time to buy and install new valves (vale job, new seals, bla bla bla) Why not freshen up the bottom end with at least some new pistons/rings/bearings...

Mainly it all depends on your current motor and so on and so fourth.

 

I guess for me the issue is money. I'd do it if I could, but I cant, so I wont.....

I'd love to freshen it up, but right now its not possilbe.

YV

 

you have to take the head off to replace the valves , why not mill the head , it will also insure you are putting a completly flat surface back on your block....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hella_JDM &raquo;</TD></TR><TR><TD CLASS="quote">you have to take the head off to replace the valves , why not mill the head , it will also insure you are putting a completly flat surface back on your block....</TD></TR></TABLE>

Yes, I would at least resurface the head if you take it off. I only had to mill mine 6 thousandths to get it perfectly flat.

 

but what im saying is , why not go ahead and mill it 30k since you are resurfacing anyway....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hella_JDM &raquo;</TD></TR><TR><TD CLASS="quote">but what im saying is , why not go ahead and mill it 30k since you are resurfacing anyway....</TD></TR></TABLE>

I guess as long as he keeps it in mind in the future if he ever decides to go with after market higher compression pistons and higher lift cams.

I am just not a big fan of milling the head more than about 10 thousandths but I do agree that you can get good gains out of milling the head if you finish it off the right way with tuning and valve train.

I think that Omni's Intertune B16 build had the head milled quite a bit to get up to like 11:1 compression and they ended up with some pretty damn good numbers.

 

well my b18 has everything minus pistons so its not a boone stock
why you ask easy i just got my car ( did a GSR to ITR tranny combo) and i want to use my car for a bit i have TODA A cams so i think the 11.1 will be better than my 10.6 also its beacuse the workshop did a poor job and now i am burning oil ( valve guides ) so thast why i want to do this
and thast why i am asking .

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EKhatch &raquo;</TD></TR><TR><TD CLASS="quote">

I think that Omni's Intertune B16 build had the head milled quite a bit to get up to like 11:1 compression and they ended up with some pretty damn good numbers. </TD></TR></TABLE>

they made over 200whp with all honda parts , now thats bad ***

 

.3 or .6 more compression is not exactly going to give you a big boost in horsepower. you're really only going to need to do this if you plan on porting the head and adding a hotter set of cams into the mix as well. a bit of friendly advice to you,,,,, one horsepower mod benefits another. this means that you are not going to get very much horsepower out of just one mod as you would if you had two or three mods that complement each other. for instance, if you up the compression then add higher lift cams to let more air in the combustion chamber to be compressed. and if you do that then port the head to allow better flow for the increased amount of air let in by the cams which is then just that much more air being compressed. and if you do that then fuel needs to be addressed too. sorry i could go on and on but i think you get the idea.

 

Thinner headgaskets improve quench too, not just compression.

-s

 

i already did the PP but used a OEM head gasket , in the end, thanks i will do the MUGEN HG thing, not sure about the VALVES yet

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sander &raquo;</TD></TR><TR><TD CLASS="quote">Thinner headgaskets improve quench too, not just compression.

-s</TD></TR></TABLE>

I was under the impression that a thinner head gasket or milling reduced quench area.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Power Rev Racing &raquo;</TD></TR><TR><TD CLASS="quote">

Higher compression leads to more hp. I would assume thats why he wants more compression.</TD></TR></TABLE>

technically yes. but way off in a sense. remember the more compression you have, the more air/fuel you need to get to the cylinders to take advantage of the compression increase. imo i would only increase compression if i was increasing the flow of air in and out of the head.

 

This is interesting..... and very informative

I knew that different valves can actually increase the CR but increase by .3 ???

Alot more than what I had anticipated and I'm liking the idea of that much of a gain from just valves.

Is this true of all brands of aftermarket valves for the B series or just a select few select companies that go to the trouble?

I assume that the increase in compression is due to flat bottomed valves as opposed to domed..... is this true or am I just talking ****?