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are bmw factory head bolts able to hold up on a turbo m20? and if not who do i go to for some stronger ones?

They are but

most people go with the ARP head studs, they provide a much better seal and make head gasket replacement easier.

can i put two head gaskets on my car to lower the CR ? and if so is this safe to do?

Just get a freaking Multi-Layer Steel (MLS) gasket!!! They can be ordered in several thicknesses and can easily lower the CR.

Kyle in NO wrote:Just get a freaking Multi-Layer Steel (MLS) gasket!!! They can be ordered in several thicknesses and can easily lower the CR.

But thoooooose cost money! I want a cheap turbo systemmmmmmm..... waaaaaaaaahhhhh!

it dosnt have to be cheap>>>>>> i did some experimental head work. and if i could just put two head gaskets together for a trial run to see how she goes then it will save the cost of buying two gaskets at the price of i think the are about 200 usd each. i may be wrong.

I seriously doubt the fire rings will seal properly for long, if at all.

Jeremy wrote:I seriously doubt the fire rings will seal properly for long, if at all.

i second that. go MLS or go home. save a few bucks( and you are only saving a few) will come back to haunt you later.

For "test run" purposes it will probably work fine. I just wouldn't beat on it set up like that...

Seems to me that you could calculate the needed thickness of the head gasket for any (within reason) compression ratio. All that will cost is a bit of time and a few tools.

Here are a few links:
http://www.csgnetwork.com/compcalc.html
http://www.rbracing-rsr.com/compstaticcalc.html
http://www.circletrack.com/techarticles ... mpression/

MLS can be used more than once. I'm on my 3rd go around and have experienced no issues at 15+psi.

zundfoldge wrote:it dosnt have to be cheap>>>>>> i did some experimental head work. and if i could just put two head gaskets together for a trial run to see how she goes then it will save the cost of buying two gaskets at the price of i think the are about 200 usd each. i may be wrong.

I wouldn't run two head gaskets even for a trial run. I don't even like the idea of a thick head gasket but it seems to work OK. What is the compression ratio of your engine?

M635CSi wrote:

zundfoldge wrote:it dosnt have to be cheap>>>>>> i did some experimental head work. and if i could just put two head gaskets together for a trial run to see how she goes then it will save the cost of buying two gaskets at the price of i think the are about 200 usd each. i may be wrong.

I wouldn't run two head gaskets even for a trial run. I don't even like the idea of a thick head gasket but it seems to work OK. What is the compression ratio of your engine?

right now with milling the head and polishing the chambers after wards umm lets see .........8.75 to 1 cr i would like to be just below 8-1 cr

Mark 88/M5 Houston wrote:Seems to me that you could calculate the needed thickness of the head gasket for any (within reason) compression ratio. All that will cost is a bit of time and a few tools.

Here are a few links:
http://www.csgnetwork.com/compcalc.html
http://www.rbracing-rsr.com/compstaticcalc.html
http://www.circletrack.com/techarticles ... mpression/

thanks this was help full . i think im just going to go for what would be if i have if figured right realy close to 8to 1 cr. i gotta get my calculator to make sure.

how low comp ratio is to low?