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Smart quod bastardus
Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,239
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Quote:
Originally Posted by BURN-BROS
J.E. changed the forging and no longer supply the tapered pins. These two changes were done at the same time, so it is hard to say which one(or both) caused the issue.
What did your pistons weigh in at? Any undercrown milling done to reduce weight. It doesn't look like it from the pic.
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Anyone know if the JE piston marking under the crown "97" means this is the improved design? I have a set of 98mm pistons that have the marking in the forging that says "97". Its in the flat area of of the piston dome between the wrist pin bosses. I took this to be in internal JE part number for the forging blanks they use.
I just had these made a year and a half or so ago. No troubles with these pistons yet in my 3.4 liter turbo engine. Its not routinely revved beyond 6600rpm though.
Thanks,
Fred
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, full bay intercooler, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.95 bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
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