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Old 01-28-2013, 09:52 AM   #31
Quiksilver
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Quote:
Originally Posted by blackbob...View Post
There is truth to this,it's the "loose" motor theory and to a degree it holds true. As long as your temps are in check and fuel is stable no worries.

No.

Building a loose tolerance engine to reduce friction-power loss in a race engine. Yes.
Building an engine with filed rings to allow them to expand under heavy heat load. Yes.
Buying an iron block because you believe the "seasoned" block has been heat cycled enough that some of the internal stresses are lessened. Yes.

Saying that a junkyard motor with worn out rings, polished cylinder walls, and extra wear on all bearings is a better candidate for boost. Hell no.

High mileage motors like that can take some abuse, but they're not ideal. And to say that it's a better candidate for boost than a newer motor is garbage. The polished cylinder walls will not retain oil as well, meaning more friction and wear. The stock rings are already beat to shit and throwing boost at it will just increase blowby and pressurize the crankcase, definitely not helping the ring's cause. The springs are worn out, as stated in that article from Hot Rod. There is nothing intelligent about running a 150,000 mile motor on boost over a lesser miles motor of the same kind.
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Last edited by Quiksilver; 01-28-2013 at 10:04 AM.
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Old 01-28-2013, 10:22 AM   #32
dsh
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It all depends on how hard the first 100,000 miles were. Some cars with >100,000 miles are in better shape than cars driven hard and abused with 30,000 miles. I would put my money on the well maintained high mileage car over the abused low mileage car any day...supercharger or not.
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