8251 or 8261 for Grid

Vmo · #1 08-11-2012, 02:13 AM

I'm going to replace my 7AL-3 system with a Grid. I see that the 8251 or 8261 are the recommend coils. What is the difference between them? I have looked at the specifications, and they look about the same.

I guess I do not really understand the technical specification numbers.

Thanks.

msdtech1955 · #2 08-13-2012, 08:27 AM

whats your engine combo?

Vmo · #3 08-13-2012, 09:12 AM

555 BBC with 2 stages of nitrous.

msdtech1955 · #4 08-13-2012, 09:43 AM

then you would want the 8261 ( more current) for the cylinder pressure
you have.

Vmo · #5 08-13-2012, 11:32 AM

Would you be kind enough to explain the differences in the 2 coils so that I can learn about current. What would the 8251 be best for?

msdtech1955 · #6 08-13-2012, 12:03 PM

here is the coil current chart

coil current.jpg

coil current-jp.JPG

Vmo · #7 08-13-2012, 03:19 PM

Thanks. I was wondering about current, because I thought that the rate that a coil could re-charge and fire again vs.overall output was the trade off.

Would the 8251 coil be adequate for my 434 normal aspirated 14:1 compression motor that I spin to 7400 rpm? I am going to use the -7AL3 ignition for it. Or would I be better of with another 8261

Both cars are strictly 1/4 mile cars

msdtech1955 · #8 08-14-2012, 06:49 AM

for the most bang for buck...the 61 would be a better choice.