Turbo question for a 200K M20

[bondheli]

the bores will not be worn unless this thing was turboed or supercharged and raced, it WILL still have hone marks on the walls from when it was built, i did a m20 that had 311k miles on it and i couldn't find a ridge with a knife and it had hone marks. the only way id screw with the bimmer short block would be if it got dammaged by rust with the head being gone and walls being exposed to moisture without being oiled, or it was overheated and the pistons started to melt and or seize (nasty up/down scoring/blue marking and aluiminum deposited on the cylinder walls) a couple of the builds i've done (last one was a m52 in a 97 528) were due to a blown headgasket allowing water into the cylinder and it sitting too long and lightly pitting the walls

If I wanted to add a turbo and intercooler to produce 350hp, could I simply change out the head for a referbed one to have a reliable car? Is there anything I should worry about in the bottom end?

[niall]

just getting your compression ratios right,
and obvioulsy do a bottom end rebuild first,
big ends and mains etc.

[bondheli]

I can't afford a bottom end rebuild, thats why I asked. I want to find out how strong the bottom end of a 200k m20 (well takin care of) is, and how much of a gamble it is to turbo it without a rebuild.

Im thinking of a stage 1 rebuilt head with arp studs for the top end.

[pmlmotorsports]

I can't afford a bottom end rebuild, thats why I asked. I want to find out how strong the bottom end of a 200k m20 (well takin care of) is, and how much of a gamble it is to turbo it without a rebuild.

Im thinking of a stage 1 rebuilt head with arp studs for the top end.

well 350hp from an M20 is far fetched w/o a lot of upgrades........maybe a
well tuned M50 might, but even that is a stretch

[bondheli]

If the stage 1 head gives me around 20hp, then I'm only looking for an additional 160 horse. 12 psi and a large water/air intercooler will do that well. I am not the only one after this, check out spoolinturbo's post: http://www.bimmer.info/forum/showthr...engine+rebuild

[niall]

i can tell you that you will not get 160bhp
that easily, no way, also, if you cant afford 100
or 200 bucks for a bottom end rebuild, then you shouldnt
even consider this.

[bondheli]

i can tell you that you will not get 160bhp
that easily, no way, also, if you cant afford 100
or 200 bucks for a bottom end rebuild, then you shouldnt
even consider this.

LOL... No, I can't afford $1000 to have the engine pulled, new seals, bearings, rings, and pistons installed and have it put back in. I'm sure the board would love for you to post some locations of shops that will rebuild a bottom end for < $200. What is your experience with turbos? A nice oversized turbo like an AR .60, some injectors, oversized maf, stage 1 head, and a 4 core intercooler would make 350hp without a problem.

[niall]

this is hilarious,
your obviously a master mechanic of 40 years
since you know so much about engines, its strange
that you dont know how to put in mains and big end
bearings.

go and learn something about cars

AND STOP READING ******** OFF THE INTERNET

[pundit]

I've got a battery powered hairdryer for sale... say five bucks?
Seriously if you can't afford to do it right the first time, it will cost twice as much in the long run not to. So if you can't afford once, you definately can't afford twice so then, about that hairdryer...?

[mattyb]

bloody hell. just buy another car for christs sake. turbo 525 with 200k. go the hairdryer and as your chums there say ,some product as well would be swell.