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Old 11-21-2015, 12:12 AM   #16
essi1553
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Originally Posted by turbobaja View Post
I was commenting on the head. Bottom end is shorter and thicker cylinders which in my experience is better for running boost. Valve size and ports are same.


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Shorter? Are you talking block height?

I think you mean to say thicker cylinder walls (since the block is the same, and the bore size for a M50 less than an S50) that is true.

You can run boost through either safely, as long as you have a good tuner, and not running crazy levels of boost. If you're going to boost the motor, stay with an M50. You want the thicker cylinder walls, and an iron block (although both blocks are iron, you lose this when you get to the m52tu or M54) Ideally you'd want to lower compression but that depends on your car's purpose.

If you're looking to build the motor thats a whole different story. Not sure why you are saying the 2.8 is the best, but you're not wrong. Technically it could be better. The 2.8 has a 84mm Stroke, while the s50 is 85.8mm, and the s52 89.6mm. The compression may be different, but if you're building a motor that would all be compensated for with the custom piston set (determined by you, and constructed to spec).

If you're car came OBD1 i'd follow that route, though the job isnt too difficult, and there are a couple guys that make pretty cheap custom wire harnesses.
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Old 11-21-2015, 01:10 AM   #17
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Rod length.


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Old 11-21-2015, 01:53 AM   #18
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135mm across the board, one model m52tu uses a 140mm but it's the aluminum block and not preferred for turbo.

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Rod length.


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Old 11-21-2015, 01:56 AM   #19
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We could discuss the M52/M54 with the 145mm rods but then we're basically debating a different beast.
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Old 11-21-2015, 08:42 AM   #20
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Why do people say to stay away from a ally block if done properly there just as good, look at all the Japanese engines most of them are ally and they run stupid amounts of boost again if done properly with a decent map.

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