OK my question is if im running a jrsc'ed b20 block with a PnP head and crowler valvetrain. While they are pulling the head to do the pnp would it benifit to run a thinner headgasket to up the CP alittle if so what would be good thickness for a head gasket... I cant up the boost anymore but i would like to run ~10.5 CP on my 2000 b20 block??? and it would be dyno'ed tuned

 

anyone??

 

You want to raise your compression on your SC'd car? If you want to raise compression, do it the right way and not with gaskets seeing as how they are going to pull the head anyway.

 

what mill the head?? I wasn't planning on buliding the bottom end.

 

Just use a stock head gasket, it'll be fine. The B20 is a lower compression engine anyway. If anything, i suppose you could consider a set of better like ARP. They are stronger and re torque more accurately.

 

"Just use a stock head gasket, it'll be fine. The B20 is a lower compression engine anyway"
Yes i know its a lower CP motor and JRSC do the best at 10.5-11 CP and thats why i want to help raise it alittle.

 

Not saying you can't but 11:1 compression on a boosted engine doesn't sound like a very good idea to me. Hell, a B18C5 type R runs 10.6:1 compression, yes it'll run, but the last one i was in with a jrsc had running issues all the time.....bad idea imo

i wouldn't go much higher than 10:1 if you do want to raise it slightly. Many companies sell gaskets like that such as Spoon, Mugen, Cometic, ect

 

Im just saying, if you have the motor apart already, you might as well utilize the time you have to build the bottom.

 

I would stay at .030" for the head gasket thickness. The amount of compression gained by changing the thickness of the head gasket is minimal. I would rather have the room for timing advance/retard knowing that the valves and pistons will play nice.

 

Man i dont even think people that have replied are even reading what you are saying... USE YOUR EYES TO READ!!

Ok so JRSC work better with a little higher compression, i know because i had a JRSC B20z in my Honda CR-V.. was fun, but the car was just too heavy so now i have an integra GSR and i want to do the supercharger again and also want that 10.1 comp that helps us squeeze every little bit of power out... I am not sure what B20 you have but if you have a B20z then just leave the compression how it is as i am sure they run like 9.6 or 9.8 comp... If you have a B20b then maybe a head gasket from a B20z will help, but i think they used slightly different piston shapes too..

How do you like your supercharged B20?? did you use the M45 kit or did you adapt the kit with the bigger blower, the M62...

Hope i helped..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sepetinswenze &raquo;</TD></TR><TR><TD CLASS="quote">Man i dont even think people that have replied are even reading what you are saying... USE YOUR EYES TO READ!!

Ok so JRSC work better with a little higher compression, i know because i had a JRSC B20z in my Honda CR-V.. was fun, but the car was just too heavy so now i have an integra GSR and i want to do the supercharger again and also want that 10.1 comp that helps us squeeze every little bit of power out... I am not sure what B20 you have but if you have a B20z then just leave the compression how it is as i am sure they run like 9.6 or 9.8 comp... If you have a B20b then maybe a head gasket from a B20z will help, but i think they used slightly different piston shapes too..

How do you like your supercharged B20?? did you use the M45 kit or did you adapt the kit with the bigger blower, the M62...

Hope i helped..</TD></TR></TABLE>

My one mistake was that i got the m45 not the m62 and yes i did buy a 00 jdm b20....also known as the b20z. See my idea behind the whole thing is that the head will be off anyways so if i wanted to up the CP alittle nows the best time. Whats the best/safest way to do so??? Do I mill the head, deck the block, or just have them install a thinner head gasket??? I dont know the pros and cons of any...thats why im asking?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fergy016 &raquo;</TD></TR><TR><TD CLASS="quote">

I would stay at .030" for the head gasket thickness. The amount of compression gained by changing the thickness of the head gasket is minimal. I would rather have the room for timing advance/retard knowing that the valves and pistons will play nice. </TD></TR></TABLE>

That says enough in its own right. What I am trying to say is that since you already have the head off, do some bottom end work. Get some forged pistons and rods (maybe sleeve it if you want) so you can run 10.5:1+ safely and reliably

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sepetinswenze &raquo;</TD></TR><TR><TD CLASS="quote"> If you have a B20b then maybe a head gasket from a B20z will help, but i think they used slightly different piston shapes too..</TD></TR></TABLE>

Both the B20b and B20z, as well as the B18b all used the same headgasket, the only exception is JDM B20's that used the P8R head as they headgasket has an 84mm bore for that application). The difference between the B20b and B20z is the pistons, that's it.

 

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

Both the B20b and B20z, as well as the B18b all used the same headgasket, the only exception is JDM B20's that used the P8R head as they headgasket has an 84mm bore for that application). The difference between the B20b and B20z is the pistons, that's it.</TD></TR></TABLE>

Yes... thanks IanB... i realized after i posted that it was the pistons not the head gasket.

And to the OP... a thinner head gasket will be fine for a well tuned N/A car but yours is supercharged, so be careful with what you choose.. I would say your better off replacing the pistons for some higher compression ratio, check it out, search, you might even be able to use an OEM piston from one of the other B series for cheaper than forged ones... search a bit...

Enjoy

 

I don't understand how he thinks he is going to get 10.5:1 compression just by changing to a thinner head gasket.