12-06-2012, 07:43 PM
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CC Member
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Join Date: Aug 2007
Location: NE Oklahoma,
OK
Cobra Make, Engine: Fords
Posts: 544
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Quote:
Originally Posted by kiwigt
"With the stock 10.0:1 HiPo pistons, I have zero evidence of detonation or pinging. For ease of starting and to reduce the load on the starter I have the msd box set for a 20 degree start retard".
I only have an older MSD 6 (non digital). Can you explain the 20 degree start retard function of the digital 6 MSD please - I might look into getting one.
The manufacturers specs on my Roush engine call for 18 degrees at 900 rpm initial timing....
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The start ignition feature is pretty cool. The unit has a couple of dials for setting rev limiter and another one for matching the msd unit to the number of cylinders the engine has. the same dial can also activate the start retard. Below 800 rpm it retards the timing 20 degrees. Once the engine goes past 800 rpm the feasture is de-activated.
I had the msd box for several years and didn't think to use the start retard. Then one summer it was hotter than usual and the car wasn't liking to restart after it had been turned off for a bit. The starter was turning over the motor really slow before it would finally catch.
So I thought to try to start retard. WOW. The same starter now spins the engine about two to three times faster. It's a dramatic difference. With the timing retarded the 20 degrees the load on the starter was just so much less I had envisioned and hoped for. I'm sold on the digital 6, and kept the unit when I sold the car it was on, a '66 GT350. It had been on that car about eight years, and I have it on my current '65 K code Mustang.
Z
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'65 K code Mustang
'66 Galaxie 500
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