head gasket???

[cornflaykes]

does anyone know of anyone that makes a thicker headgasket for our p5/mp3's to drop the compresion.......

 

[spoolinmp3]

Yes your local mazda dealer. Order a new gasket and double stack them. This will lower compression on our cars to 8:1

 

[big_ben]

How do you know this Terry? You must be testing stuff again.

 

[spoolinmp3]

How do you know this Terry? You must be testing stuff again.

I will follow up on this later. We are currently experimenting with this on a turbo p5. But it looks promising

 

[smithers_0990]

What does a lower compression do for you? I thought that a higher compression was better.??

 

[big_ben]

What does a lower compression do for you? I thought that a higher compression was better.??

If you have lower compression, like on an Eclipse, you can run higher boost. This will sacrifice some of your low rpm power and torque, but the high rpm power increases will be worth it.

 

[herarety]

Verry interesting..be sure to keep us posted.

 

[70]

That sounds interesting...How thick is the stock head gasket??

 

[Kooldino]

Yes your local mazda dealer. Order a new gasket and double stack them. This will lower compression on our cars to 8:1

How much PSI can you run with 8:1 compression with stock internals?

 

[Kooldino]

Conversely, what would happen if we got a THINNER head gasket (or removed it...tho I'm sure this is dangerous)? We'd get better compression, right?

What exactly does the gasket DO anyway?

 

[big_ben]

The head gasket is what seals the cylinders. This is why usually when your car is over heating, the first thing to go is the head gasket. It's like a safeguard so you won't crack your head. If you took the head gasket off, your coolant would mix with your oil and leak into the cylinders and break a rod or crack the head. I'm not sure if they even make a thinner gasket. But to sum things up, you have to have a head gasket.

 

[fastdrvr23]

Yes your local mazda dealer. Order a new gasket and double stack them. This will lower compression on our cars to 8:1

How are you guys sealing the two gaskets together, Blue RTV or something? I figure that there has to be something pretty tough between them to keep them from misforming. I would imagine that when you torque the head back down, that they might misshape if not glued/stuck together some how?? Just curious though, I hope I never have to go that far into the P5. I've done both on my truck though... lol

 

[spoolinmp3]

We are using a "method" to bond them together. If all goes well we should be able to run 10psi on an fmu reliably

 

[70]

We are using a "method" to bond them together. If all goes well we should be able to run 10psi on an fmu reliably

Not giving up any trade secrets eh??

 

[chdesign]

Conversely, what would happen if we got a THINNER head gasket (or removed it...tho I'm sure this is dangerous)? We'd get better compression, right?

What exactly does the gasket DO anyway?

Yes you got a thinner head gasket you would raise your compression. From the looks of moving the compression down to 8:1 by double stacking the thickness of the stock head gasket shoudl be around .030

 

[70]

Yes you got a thinner head gasket you would raise your compression. From the looks of moving the compression down to 8:1 by double stacking the thickness of the stock head gasket shoudl be around .030

What I find interesting is that such a small distance, makes such a large change.

 

[chdesign]

You would be very surprised. a difference in .010 on a B16A1 moves it from 10.2:1 to 10.6:1

 

[mazdamp3_18]

if there is enough of people who want to up the compression with a thinner gasket i can arrange them to be made....

 

[slowyellowp5]

So how exactly does one "stack" two head gaskets anyway?

 

[big_ben]

Spoolin, you really open up a can of beans with your statement. I would not suggest anyone do this unless you really know what you are doing. When you stack two gaskets on top of one another, it makes a weak spot in between them. You are VERY prone to leaking between the two. Unless it is sealed and torqued perfectly, the gasket will deform and you will have huge problems. So unless you know what you are doing, don't try it.