Quote:
Originally Posted by Kemo
All...thanks for the input...my motor is a 1978 big port with 9.8:1 compression, GT racing headers and a dansk gt3 center out muffler, interesting about the rotor, does pelican sell them?
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No they don't. I use a NAPA Echlin made rotor EP 407...it looks exactly like the stock rotor minus the glued in resistor...it has a solid transfer bar.
If you take another look at your MSD inst. they say max perf. comes with the least resistance.
Some using MSD have had the original resistor style rotor melt/deform. Some others seem to have no issue...depends upon the MSD box type I suspect.
Did you modify/change your piston profiles? Oh yeah....track it. If you are running 9.8: 1 then a colder plug should be in order too I use an NGK BRP9 ES stock number 7788. This is also the range Porsche recommends for that compression in the 930-10 Euro. Especially with anything under 93 Octane US. Hotter and you could have detonation as you know.