Coil Choice - Team Camaro Tech
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post #1 of 6 (permalink) Old Apr 11th, 12, 08:48 AM Thread Starter
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Marc
 
Join Date: Jul 2001
Location: Belgium
Posts: 546
Coil Choice

Hi

Please can you explain the importance of secondary resistance of a coil for a particular application?

For ex :
MSD blaster 2 : 4.7 K ohm
Accel 8145C : 10.8 K ohm


Best regards

Camaro 1968, propane 327ci, Big Brake, Hotchkis, T56
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post #2 of 6 (permalink) Old Apr 11th, 12, 01:14 PM
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Alan
 
Join Date: Oct 2007
Location: SoCal
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Re: Coil Choice

6.1 ohms? Negligible for our applications. Reminds me of total harmonic distortion on stereos:

.3% vs .6%, like anyone could hear the difference, it is all just bragging rights.

alan
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post #3 of 6 (permalink) Old Apr 11th, 12, 01:37 PM
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Matt
 
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Re: Coil Choice

Marc,

Let me start by saying I am new to this so I may be wrong. But first the difference is 6.1 thousand ohms not 6.1. Secondary resistance in and or itself is not important. It is how this resistance effects the voltage and current supplied to the spark plugs that matters. The higher resistance in the secondary windings will limit the current and/or voltage supplied to the plugs. It will also make more heat in the coil. I looked at the Accel website and couldn't find a specification for the peak current for the 8145C. My guess is that it will be less than the Blaster 2 but don't know for sure. A higher current at the same voltage will give more energy to the spark.

How much difference you will see in your application I cannot say.

Hope this helps and if I am incorrect hopefully someone will correct me.

Matt
67 RS, 406 small block, TKO600, Moser 12-bolt (3.73)
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post #4 of 6 (permalink) Old Apr 11th, 12, 11:33 PM
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Steps
 
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Re: Coil Choice

Off subject
Quote:
Camaro 68, mild 327, LPG Autogas,
u running LPG? dedicated or duel fuel
What system ? IMPCO ?

My Spelling is not incorrect...it is creative

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post #5 of 6 (permalink) Old Apr 12th, 12, 02:25 AM Thread Starter
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Marc
 
Join Date: Jul 2001
Location: Belgium
Posts: 546
Re: Coil Choice

Hi!

Yes for sure it is K Ohm not Ohm.
By what you said I can keep my blaster 2 and it will run just fine or even better. High secondary resistance is also needed I guess to avoid short circuit inside a coil..

My question came because I bought a new Acce 52100 distributor as my old Mallory is worned out, and Accel recommend their unit to run with their coil so I looked at it...


Steptoe, I am just right now installing an IMPCO 425 mixer straight on holey base plate for LPG only and I am informing as you see about best tuning. I am also changing the position of the evaporator to bring it closer to mixer, I will attach it by the firewall. Untill recently I was running a Impco 300A with dual fuel and no specific ignition settings, and I was not satisfied.


Regards

Camaro 1968, propane 327ci, Big Brake, Hotchkis, T56
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post #6 of 6 (permalink) Old Apr 12th, 12, 10:03 PM
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Steps
 
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Location: New Zealand
Posts: 13,316
Re: Coil Choice

I ran a 300a upto abiout 1986 and been dedicated LPG ever since then
L converter and 425 ..used to be on a holley base but eventaully wore the 1 st 425 ot about a yr ago and replaced it along with a Q jet 850 cfm base..
As this is about the best place to be for 1st gen...
http://fuelsforum.rasoenterprises.com/index.php

Tuning principles remain the same , except LPG has a few anolies like very low idles , doesnt get hot on lean mixtures. doesnt detonate as easy....

See u there...
Cheers Steps
Steps

My Spelling is not incorrect...it is creative

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