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roadnotca

roadnotca

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They say they supply 18V to the ignition only, for better spark yadayadayada.
I would think anyone with two batteries, or still has 24V, could do this with pocket change and a trip to RadioShack.
Any Gurus out there? Would it be as simple as a diode and a schematic?
 
Interesting idea. Makes sense on the coil input side if it drives higher output.
 
roadnotca said:
They say they supply 18V to the ignition only, for better spark yadayadayada.
I would think anyone with two batteries, or still has 24V, could do this with pocket change and a trip to RadioShack.
Any Gurus out there? Would it be as simple as a diode and a schematic?
Click to expand...

Diode will only drop .6V, so you'd need a bunch, like, err, ten of them in series to drop 24 to 18V. Further, they'd hafta handle the full current, which is what, 10A or so on the "12" volt side? so they'd hafta be honking big diodes, not something you'd get at Radio Shack. I think the biggest 1N400X flavour they have is 5A.

You could build a switching power supply, but by that point it'd be easier, cheaper, more reliable to get one of these.

BTW, the "coil" is actually a transformer, right, so if the primary side is wound for whatever voltage, putting more in will get you more out ... but then again, so would a transformer with a different winding ratio. May as well just get a higher-output coil if you want more voltage at the sparkplugs.

-- A
 
I said diode not knowing any better.:doah:
They are somehow doing it without a coil or transformer, its just a little box, from 14.2V.
I'm just thinking its probably easier starting with 24V.
:haha: It's been 40 years since I had Electronics.
 
Its called a "Step-up Regulator", so what they're doing is bypassing the regulator in the Alternator (??). That takes more power, squeeling belts???:haha:
 
That there be a switching power supply then. Efficient, solid-state, low-heat ... and no way you or I is gonna build one as good as cheap as buying one :(

-- A
 
dremu said:
That there be a switching power supply then. Efficient, solid-state, low-heat ... and no way you or I is gonna build one as good as cheap as buying one :(

-- A
Click to expand...
Ya, I think I saw that description "switching power supply". DUI's selling point is that it allows opening the spark plug gap to ~.070!
That's interesting because I read an old interview with them where they admitted GM HEI is good to support .065 gap stock. The reason GM specs ~.045 is for durability of the cap, rotor, wires, plugs. Modern mat'ls would make those kind of gaps (.060-.075), practical.
Hmm, $250 of hype?:haha:
 
I would think so. Stock GM ran gaps up to .080 on their motors with HEI. We trying to ignite diesel or something? :)
 
MSD makes a race box that runs on 16v. They do make more juice at the plug. But they cost more cash and for a daily driver I don't think it gets you enough to warrant the extra cost. Where the high voltage boxes shine is at tracks that limit lots of engine parts but not the voltage in the ignition:wink1: so you have 5~10 more horsepower than the rest of the field.

BTW the prostock guys in both NHRA and IHRA run the 16volt box.
George
 
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