alfred e numan
Senior Member
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- 1,325
This was one of those 30 dollar pipes ddm had on sale. It has been pressure tested underwater. No bubbles. Will it last? Only one way to know-- hammer it after the 2 rubber mounts are nickel silvered on.- It tensile streingth is eighty thousand psi. The bronze is 60-65 thousand. This uses the stock jet pro rear mount header, If it fails? Just bolt on the jet pro and no fiddle farting around with the header. There is the question about heat transfer on the copper 90 degree street elbow-- It may have to have a film of bronze flowed if it runs too hot- no idea really- just a thought. The engine is not a 270. its a CY 29- This may? be a better match for the 29. The 29 runs out of porting about the time the jet pro is starting to kick in. still ran pretty good though---