Technical > Spud Miller's Cave
Switch to Mag?
JrFuel Hayden:
George, what compression ratio are you running and what fuel flow ?
I find with the more combustion pressure you run the more ign you need.
If you are running 13 to 1 compression, and under 2 gpm fuel flow you may not need a mag.
As far as the weight of an on-board battery to power your dist ign, you could go with lighter battery, I sell a 12 volt, 550 amp battery that weights under 5 lbs. And MSD said a 7al only needs a 12-15 amp battery, which I can get that weighs 1 lb.
I'm sure Spud can fill-in some details, on mag vs dist ign systems.
Jon, Hayden Wheels, 800-624-3803
Supercat:
We took or FED out today with the new Mag(Mallory Super mag redone by Cirillo) and external coil. We only got one pass and had a fuel shutoff valve close about 300' out.
We had been running an MSD with the large pro cap and their coil. We seemed to chase different ignition issues all the time. The engine is a 462" healthy 13.8 to 1, Hilborn 4port( used as a throttle body) with Enderle nozzles and jets at the valve. Our tune up uses about 4-4.5 gallons a pass with burnout.
Today you could hear the difference in the engine tone. Enough so the announcer comment we must be running a healthy dose of Nitro ;D.
I'll post a video in the FED today section when we upload it.
George:
--- Quote from: JrFuel Hayden on July 06, 2014, 02:36:10 PM ---George, what compression ratio are you running and what fuel flow ?
I find with the more combustion pressure you run the more ign you need.
If you are running 13 to 1 compression, and under 2 gpm fuel flow you may not need a mag.
As far as the weight of an on-board battery to power your dist ign, you could go with lighter battery, I sell a 12 volt, 550 amp battery that weights under 5 lbs. And MSD said a 7al only needs a 12-15 amp battery, which I can get that weighs 1 lb.
I'm sure Spud can fill-in some details, on mag vs dist ign systems.
Jon, Hayden Wheels, 800-624-3803
Jon, I have shelved the injected setup. It was 13.4:1 and I ran a waterman 400 ran only a main bypass. I usually ran a .075 pill. A 355 CID SBC 640hp.
George
--- End quote ---
dreracecar:
One of the sponsors sells these -- GET ONE!!!!
masracingtd1167:
I have been very happy with my 7al3 box It has some nice features like a starting line chip ,a shift chip , high side and a retard . I have had zero problems with mine even spraying with a 250 shot of nitrous . Just my 2 cents . Bill
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