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Re: more pistons.. Posted by 900 Aero [Email] ![]() ![]() In Reply to: more pistons.., derf, Fri, 17 Dec 2010 10:46:58 Members do not see ads below this line. - Help Keep This Site Online - Signup |
That is interesting! Also I don't remember the exact Wossner weights as I've only had my hands on one set so far but both JE and Wiseco have been keeping their weights within 3 grams usually 1 or 2. I'm not trying to intimidate you and even enjoy reading all of your posts as you have way more Saab experience that I do however I've been involved with performance engine building for close to 50 years! Anyway one of my pet peeves is people thinking that a forged piston is still noisy during start up when it doesn't have to be! The 4032 alloy we use for a street turbo application ends up very close to stock Mahle clearances with the added skirt coating we use. Even the 2618 alloy pistons we use in a serious street turbo Saab aren't noisy on a cold morning with the Swain Tech Coatings we like best where we don't include the skirt coating in the actual clearance which makes up for the additional clearance required for the higher expansion rate of a forged piston. The trick here is to finish hone our cylinder bores before the pistons are sent out for skirt coating so we know exactly what the clearance is before the coating is applied. Thanks for the reply! Take care, Dave
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