M10, M42, M44 internals inquiries, and boost-happy potential

[flagger3]

Did you do any internal work on the engine? Is it already low compression, or are you just running stock everything?
I would like to turbo my 318 with the m10 and as far as i know its low compression already.

[flagger3]

The m10 is a lower compression enginge, the m42 is the newer high compression engine. Its very interesting that the e has a lower compression cuz I'm gonna try and do exactly what you are doing run stock internals 6 to 8 lbs

[bmw95318is]

yeah flaggers right the m42 has i think 10.5:1 compression if not its probably 10 then

[flagger3]

318is what did you do with your itnernals when you turbo'd your m42?

[bmw95318is]

I didnt have to do anything the m42 is alot better than the m44 internally most of the parts are forged and the crank is double counterweighted and good for revs around 7200 but the m42 is pretty bulletproof compared to other engines. plus the m42 has integrated oil squirters to cool the piston crowns down and the valves are sodium filled to reduce heat which is great for forced induction setups. The engine also comes stock with adjustable cam sprockets so you dont have to buy expensive ones to fool with the timing it also has a pretty strong duplex timing chain its a pretty bad ass engine just wanting to get turboed. the only thin i changed internally was the hydrualic chain tensioner which is a common failure on that engine but not really a forced induction issue.that engine hits hard with low boost around 10 because of the high compression and its 10:1 i looked it up.

[flagger3]

so m42 is a decent way to go, know nething about m42 compared to m10?

[bmw95318is]

i dont know much about the m10 but i think it has a lower compression i was looking around on google and some people said it was ideal for boost but im not an expert on that engine does someone else have any knowledge of the m10?

[tws]

If you do not replace the rods make sure that you replace the rod bearins. The US M10 motors for '80-85 like to throw a rod out side the block some time around 160km. Don't keep the motor in the red line for long periods of time if keeping it stock.

Should be a good sleeper when set up.

TWS

[flagger3]

Thanks for the advice, keeping the car stock is pretty much what i wanna do. Is it hard to change out the rods and such? Ive never taken an engine apart before so factor that in.

[justindd911]

Originally Posted by flagger3

Thanks for the advice, keeping the car stock is pretty much what i wanna do. Is it hard to change out the rods and such? Ive never taken an engine apart before so factor that in.

then dont do it, have a specialist do it. Dont rick your motor to save a few bucks.