Hi guys,
I have a 10:1 comp m30 3.5L in my e28. What you would all call a dirty motor. I also have a ported and polished b35 head sitting around. Would using that head lower the compression enough to allow me to turbo this motor or will I need a thick MLS head gasket as well and if so what thickness would be the best? Any ideas what CR I'd end up with?
Cheers
Adam
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will a b35 head and thic gasket lower my compression enough?
Hey Adam
Did the same with my engine build for the FI.
although i did install 9.0-1 pistons,I fitted a steel and grafite sandwich gasket.
got the guy to make it 30% thicker then standard,after torqueing.
Ihave no idea what ratio it running,but still had enough getup and go to stick with my mates who have the same model etc. before we started adding extras.
from memory running 180 psi per cylinder.which isnt far off being accepptable in a stock situation,according to my manual
As for your plan i dont know how much more it needs to be, (75%)??
but its definatly cheaper.
check out red535t on photobucket.com for a few pics etc.
cheers marty (nz)
Did the same with my engine build for the FI.
although i did install 9.0-1 pistons,I fitted a steel and grafite sandwich gasket.
got the guy to make it 30% thicker then standard,after torqueing.
Ihave no idea what ratio it running,but still had enough getup and go to stick with my mates who have the same model etc. before we started adding extras.
from memory running 180 psi per cylinder.which isnt far off being accepptable in a stock situation,according to my manual
As for your plan i dont know how much more it needs to be, (75%)??
but its definatly cheaper.
check out red535t on photobucket.com for a few pics etc.
cheers marty (nz)
Re: will a b35 head and thic gasket lower my compression eno
Just changing to the M30B35 head gives 9,1:1 in comp on your M30B34 engine.photo500 wrote:Hi guys,
I have a 10:1 comp m30 3.5L in my e28. What you would all call a dirty motor. I also have a ported and polished b35 head sitting around. Would using that head lower the compression enough to allow me to turbo this motor or will I need a thick MLS head gasket as well and if so what thickness would be the best?
Alright cool, thanks guys, I guess I can go ahead now and see how it ends up. I was only planning to run low boost anyway in the beginning. I will still get the ARP head studs and a new gasket though as that seems like a good idea. I have a fuel controller that intercepts the signal from the AFM and changes it to what ever I like so I'm pretty sure I can get away without a RRFPR. Thanks for all the help, makes living in western australia not seem so isolated afterall ![Wink ;)](./images/smilies/icon_wink.gif)
![Wink ;)](./images/smilies/icon_wink.gif)
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Its a Jaycar unit actually, which is one I made up myself
http://www.jaycar.com.au/productView.as ... BCATID=347
Jaycar have quite a few really cool kits and they are cheap too. Do you guys get them over there?
Thanks Bert for the gasket info, is 2mm available in the MLS gaskets off the shelf or would it need to be custom made?
http://www.jaycar.com.au/productView.as ... BCATID=347
Jaycar have quite a few really cool kits and they are cheap too. Do you guys get them over there?
Thanks Bert for the gasket info, is 2mm available in the MLS gaskets off the shelf or would it need to be custom made?