The_Head

I have my B16A block getting built up for FI right now, it is going to be 9.0:1 compression already. I was wondering if it would be ok to use a Mugen 2 layer headgasket for a FI application. It would raise the compression up to 9.2:1 according to the c-speed calculator. I plan on boosting 7 lbs daily driven, up to 14 lbs on occasion. Let me know what you think of me using the Mugen headgasket ...

*I did do a search, learned a lot, but none of the posts were exactly the same situation as mine... hence the post*

TIA

poison

14 psi on stock internals?? no way, unless u get it big time tuned and running race gas.

7 psi daily driven is fine, but 14 psi, if you are running stock internals i wouldn't risk blowing the motor for a mm of ur head being pullled back

better safe than sorry.

on stock internals, get it tuned and dynoed and find out what's the highest PSI you can go being safe. as well as get your timing tuned.

Turbo_Si

Stock head gasket will do. Mugen and Spoon gaskets are just too expensive IMO.

The_Head

The Block is getting built for FI...

Wiseco/IB pistons 9:1 compression, 84mm bore (forgot to mention that)
Eagle Rods
GE resleeve
ARP headstuds
new bearings, pumps, etc...
and will be running 91 octane

Smashback

Only 14 PSI with all that hardware? Why are you even asking?

The_Head

Good Question...

I am shooting for 350 whp, which I believe is a good limit for pump gas.

poison

very good

The_Head

I need an alternative then... A headgasket that will withstand turbo cylinder pressures AND raise my compression just a bit... I dont want to go lower than 9 to 1 compression

BROOD

My suggestion: Cometic gasket with standard fire ring thickness (considering the GE sleeves are stepped). You can get the gasket in thinner versions than stock, but I'd stay with the stock gasket thickness anyways.
They are supposed to be installed dry, but I'd still use copper spray.


[Modified by SLPR, 5:42 AM 7/31/2002]

Farnsrocket

Yeah, why raise compression? If anything, you'll want to lower it.

The_Head

It's lowered already to 9:1 with the pistons it's receiving, I'm trying to stay at that level or go just a tiny bit higher, I dont want no 8.5:1 compression.

ekb18c

Dude, 9:1 compression is low enough already. Please do not lower your compression anymore. I have used stock headgaskets for the longest and have no problems with it, even on race motors. I jsut think mugen or spoon headgaskets are a waste of money IMO.


HTH

Farnsrocket

Well, then get a Mugen if you want to raise it or get a stock if you want to keep it the same........it's your money. In my last post, I meant you'll want to lower your compression when you go FI, and you have already done that with the pistons, so why not just keep a stock headgasket....it can withstand high pressure. I am not quite sure what the question is now.


[Modified by Farnsrocket, 12:49 PM 7/31/2002]

The_Head

It sounds like it would not be cost effective to use the Mugen gasket, I am already looking at what Cometic has to offer... But, WOULD IT (MUGEN)HOLD UP (LONG TERM) TO 14 LBS OF BOOST?

The reason I want to raise the compression a bit is because the low-end on the B16A is bad enough as it is... Imagine how it would be with 8.5:1 compression

B20-T

i am using stock gasket with cooper spray

ILOVEGIRLS

mugen head gasket is suppose to raise your compression by .4 and its about 129 bucks.

The_Head

Thanks for all the help guys, I'm prolly going to go with a cometic headgasket, .043" thickness. It will lower my compression to 8.8:1 but at least I will be safer that way.

PrecisionH23a

9.0:1 compression is ideal for turbo, leave it at that. period. Use an OEM headgasket, they can withstand up to 500hp (20psi easy) without failure, you are just wasting money on the mugen headgasket. What fuel upgrades and electronics/ecu do you plan on running to hit 350hp? Give me a list of your mods and we can go from there...

2K_TEG

I will be hosting a Cometic HeadGasket GB soon. I am trying to work out better pricing with Cometic right now. As soon as I talk to Scott at Cometic you guys will have pricing and the GB will begin. He is very hard to get a hold of though.

SCOTT, if you come here CALL ME BACK!!

Flamenco-T

stay with stock OEM gasket....they hold up more than most of us think...


stan

TurboTegB18c

Let's say i'm going with 84mm bore on a b18c block, would i need to file the oem gasket to 84mm bore? I think most of us like the cometic because they are premade in 84mm sizes correct? Let me know what you guyst think, i've had mixed opinions on these, any people actually used cometic on boosted motors yet? Paul

Flamenco-T

ooh, I missed the 84mm part..
yeah, if you;re going any bore bigger than .20 over, then use a cometic...

max size on stock head gasket is 81.5mm

stan

The_Head

This is my second turbo car, I know exactly what I need to have to make the power happen. The Mugen headgasket has been ruled out at this point, Thank you for the comments.

The_Head

*edit* directed towards 2K_TEG

Yeah, I posted in your thread about the GB, I can wait. The block will be going in my car in mid-October, and will be broke in and ran NA until late December... well, thats the plan anyways.


[Modified by xThexHeadx, 12:34 AM 8/2/2002]