[MR2] Oil Change? Not OEM anymore.
benjamin at seattlefenix.net
Thu Jul 17 19:45:31 EDT 2008
* Benn (karhu at california.com) [080717 16:33]:
> Not sure I'd recommend forged pistons for the street...they tend to fit
> looser until heated, i think. I'd ask some piston people first what they
> recommend for your application. The rest of the oil equation would be
> determined by temperature range (ambient starting and peak oil temp),
> bearing clearances (at least in the olden days people ran higher clearances
> and thicker/heavier oil--I'm not sure that makes sense, but that's what was
> done), and loads (heavier oil for heavier loads). I used to run
> 0.002-0.003" clearances on bearings in my roadrace 'vette and 30W or 40W oil
> without problems, but I couldn't state that that is the optimum--it's just
> what I did. For street use I'd go with 10W30 and call it good. But I'm NOT
> a lubrication engineer.
I mulled over the forged debate for a while and decided to go with Wiseco pistons. They're still forged, but the closest to stock for silicon content and thusly reasonable expansion. It helps that I got both the pistons and a set of eagle rods for $300. I fully expect the oil temperature range to remain similar to stock. The engine will make more power, but probably nothing beyond 250whp. If I replace the ct26 next year, even then I'm not looking to put this particular motor through more than a GT28rs and a Nemesis ECU for something between 300 and 350whp.
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