Trying to find a place to mount the coil (ACCEL 300+). How long can I let the coil wire get? I thought I read somewhere about 18" was maximum recommended length?

-Greg

 

Personnally I wouldn't use a physically big coil.

Yes, you are right to limit the length. Since your car is NCRS. I'd think about punching a hole in the fire wall and mounting it straight back under the dash.

I have my Crane digital box in the cool air and away from under hood RF in the wiper channel. I could have also placed my small Crane coil there also.

 

The coil isn't really big, but it is ugly and yellow. I worry about putting it inside the car and having the coil lead have to pass by the rest of the ECU wiring. I don't think either it or the ignition box will fit in the wiper vent bay, but it's a good idea and I'll take a look.

-Greg

 

This is the Crane h-6R or something close to that. Really a nice sequential misfire rev two stage limiter and Multi spark.



Any way click under my avitar and it's a not so good picture of the crane box in the wiper area. I know what your talking about with high energy RF off these new ignitions.

Since I installed these things - it's been good by to radar Laser detector. It's in constant alarm mode.

 

The EFI computer has the rev limit function in it, so I've got the ignition box set higher (might have to set it to "none"?). Looks like I'll locate the two conrol boxes together where the glove box isn't (due to the roll cage), take a look at the picture at bottom of the page http://corvetteforum.net/classics/gr...corvette22.htm . I looked at the wiper bays but mine are shallower than normal (modified to accept the set-back firwall) and much smaller than on the C-3 so that location is a no-go. I've got to check with some RF guys at work, but I think if I ground the two cases together it should keep any interference at bay.

The coil location is still a TBD but looks like it has to be somewhere on the right side of the firewall or in the top of the fender well above the trans cooler (maybe hidden from view behind the expansion tank?).

-Greg

 

Most good street type spiral wound spark plug wire is over 500ohms per ft. As u increase the wire length u increase the voltage drop across the wire and reduce the spark voltage at the plug. This is counter productive as u bought the performance coil to increase spark voltage in the first place. Now solid core racing wire is a different story as it has hardly any resistance - but dosen't last to long on the street with hi-vibrations.
Sorry i can't calculate how much as i would need to know coil output voltage for your system to do so. But for example for a typical hi-perf ign putting 50,000v out of coil through 1' of wire at 500ohms would pass 10 amps (50,000/500) of current in a spark/burst - but of course other resistance in circuit reduce this more. But to use 2' of wire now reduces current to 5 amps (50,000v/1000ohms).
Bored enough? Ok, ok, but i think its easy to see now what happens when adding wire.

Ok i looked at ur pix and don't c how a big yellow coil in that highly moded eng comp would hurt the color coordination. Are we talking Fung Suway in the engine compt here?
BTW Greg have u considered decaf? Now i c what happens when an aero engineer buys a old corvette. Well i can't laugh too much as went to replace my broken fan shroud and 3-4yrs later (lost count) i have finaly started it after replacing: mtr mounts, fan shroud, radiator, all new shroud seals, camshaft, cyl heads, headers, intake, fuel pmp, fuel tank, charcoal EVC canister, and most all rubber fuel lines on intire car. Repaired other items too like replace rear bumber to but can't recall'm all right now.

Well anyways most electrical components are fine at chassis ground which is connected to the batt neg. Most electrical problems occur when electrical gnd is lost from engine to frame. I met one owner who found his entire dash power & lighting was grounded through the coil positive - he found this by way of heated/melted wire. Many hot rodders that remove the eng to frame gnds end up with current travel through rotating u-joints creating a strobe light show as car speeds up and slows down. And i highly doubt those control boxes cases need to be at floating ground - my guess is ok to gnd both. BTW i installed my MSD 6AL box inside the passenger compt and works fine mounted to just fiberglass - but it does have a direct connection to both batt pos+ and neg- (no separate chassis gnd but suspect its internal).

Well i need to shut up now but those bad-azz fuel injectors really look cool.

Good night. cardo0

 

I decided to mount the coil to the forward cage leg, only good spot I could find. Take a look at the last pic. http://corvetteforum.net/classics/gr...corvette22.htm

-Greg

 

Many of the high powered ignitions - like my optical can't run solid core. So I use the 10.4mm Taylor Pro 409 Spiral race wires. I think that they are a low ohm per foot.