coils

[Lou]

Here is a video of how to test your Mutt ignition coil. Includes the testing of NOS US coil and 2 aftermarket coils. Provided is the actual output voltage measured of all 3 coils, a real eye-opener.

Spoiler; none of the aftermarket coils tested had the proper primary resistance and this affected the output voltage of the coil. The higher inductance and resistance of the primary has more inductive “kickback” which must be absorbed by the capacitor if using points or electronic ignition module. This explains why many using aftermarket coils have failed electronic ignition modules a short time later after replacing the coil.

https://youtu.be/4pSG_X1lZ5c

[Horst]

great measurements!

[Hambone]

Great info, they must have painted the chrome ones black.

[muttguru]

I've just finished watching the video. An excellent pictorial.....but a very disappointing outcome for the much vaunted "New Black" coils.

The price of original GI Mil-spec coils has probably doubled today.
Ken

[rickf]

And one particular dealer who is selling these "new" coils as "original specification" coils is probably not very happy with that information!!!

[Lou]

And one particular dealer who is selling these "new" coils as "original specification" coils is probably not very happy with that information!!!

And I bet he will not refund my money, either!

[Lou]

Great info, they must have painted the chrome ones black.

Very possible since the primary had the same exact reading

[Lou]

great measurements!

Thanks! Never saw anyone post the output voltage of an ignition coil before. Most likely because that Tektronix P6015A Probe cost over $2,600! https://www.newark.com/tektronix/p6015a ... easurement

[lpcoating]

Are there drawings for the US coil?

Guy

[lpcoating]

Guessing no one has any info or knowledge of a drawing or schematic?

Guy

[rickf]

I would guess the original coils had drawings, you would have to source the archives of those companies. First you would need to find the companies that made them and there were probably several. I am sure AC Delco had a hand in it. The problem is not making the coil but making the coil in the form factor that is needed to fit the M series distributor. That is a VERY limited application and is not going to be a big seller. Going to be hard to convince an American company (if there even are any more) to make such a limited item.

[Cobra5]

Prestolite Electric was a manufacture under part number CY4002. Here is a link to their website but you would have to contact them to see if they have info. https://www.prestolite.com/Corporate/

[old dodge guy]

MVPA archives has truckloads of drawings from the military, I wonder if they might have a copy? As this was a "mil spec" part, the military should have had a tech drawing somewhere. Couldn't hurt to contact them to see.
MVPA.org

[svramselaar]

hi
below at this site the mil spec for coils
i have not look it over so i do not know if this is it

http://everyspec.com/specifications-sta ... search.php

MS51114 CMS51114C (NOTICE 1), MILITARY STANDARD: COIL, IGNITION-24 VOLT DC (WITH INTERNAL BALLAST) (16 JAN 1994).
MS51114 CMS51114C, MILITARY STANDARD: COIL, IGNITION-24 VOLG DC (WITH INTERNAL BALLAST) (06 JUN 1973).
MS51114 CMS51114D (NOTICE 2), MILITARY STANDARD: COIL, IGNITION-24 VOLT DC (WITH INTERNAL BALLAST) (31 MAR 2003).
MS51114 DMS51114D, MILITARY STANDARD: COIL, IGNITION-24 VOLTDC (WITH INTERNAL BALLAST) (10 MAR 2008).
MS51115 AMS51115A (NOTICE 2), MILITARY STANDARD: COIL, IGNITION-24 VOLT DC (WITHOUT INTERNAL BALLAST) (31 OCT 2003).
MS51115 AMS51115B (NOTICE 1), MILITARY STANDARD: COIL, IGNITION-24 VOLT DC (WITHOUT INTERNAL BALLAST) (15 MAR 1993).
MS51115 AMS51115B, MILITARY STANDARD: COIL, IGNITION-24 VOLT DC (WITHOUT INTERNAL BALLAST) (07 JUL 1967).
MS51115 BMS51115B, MILITARY STANDARD: COIL, IGNITION-24 VOLT DC (WITHOUT INTERNAL BALLAST) (10 MAR 2008).
MS51355 CMS51355C (NOTICE 1), MILITARY STANDARD: COIL, STARTING - ENGINE IGNITION, WITH FILTER, 24 VOLT DC (18 APR 1990) [NO SUPERSEDING DOCUMENT].
MS51355 CMS51355C, MILITARY STANDARD: COIL, STARTING - ENGINE IGNITION, WITH FILTER, 24 VOLT DC (17 SEP 1969) [NO SUPERSEDING DOCUMENT].


specs for the M151


MIL-T-45331 FMIL-T-45331F (AMENDMENT 2), MILITARY SPECIFICATION TRUCK, UTILITY: 1/4 TON, 4X4, M151A2, TRUCK, AMBULANCE: FRONT LINE, 1/4 TON, 4X4 M18A1, TRUCK, UTILITY. 1/4 TON, 4X4 CARRIER FOR 106MM RIFLE M825 (18 JUN 1981)
MIL-T-45331 FMIL-T-45331F, MILITARY SPECIFICATION TRUCK, UTILITY: 1/4 TON, 4X4, M151A2, TRUCK, AMBULANCE: FRONT LINE, 1/4 TON, 4X4 M18A1, TRUCK, UTILITY. 1/4 TON, 4X4 CARRIER FOR 106MM RIFLE M825 (19 JAN 1976)
MS500071 AMS500071A (NOTICE 1), MILITARY STANDARD: TRUCK, UTILITY, 1/4 TON, 4X4, 85 INCH WHEELBASE MILITARY DESIGN, M151A1 (22 MAR 1978) [NO SUPERSEDED DOCUMENT]
MS500071 AMS500071A, MILITARY STANDARD: TRUCK, UTILITY, 1/4 TON, 4X4, 85 INCH WHEELBASE MILITARY DESIGN, M151A1 (22 MAR 1978) [NO SUPERSEDING DOCUMENT]
MS52165MS52165, MILITARY STANDARD TRUCK, UTILITY, 1/4 TON 4 X 4, M151A2 (8 MAY 1985)


george

[lpcoating]

This is interesting. So I did a search on the CY4002 part number. Found a company that has 295 of them! They purchase surplus. Interesting enough we were in their system as we've done business in the past. Out of curiosity, I asked them to quote the following quantities, hoping for some secret honey hole that wanted to sell them for $25 each. LOL - No such luck!


Part Number Qty Price Total
CY4002 295 $295.63 $87,210.85
Description: COIL
Delivery: Immediate
Condition: New Surplus
Certs: Yes

CY4002 100 $375.00 $37,500.00
Description: COIL
Delivery: Immediate
Condition: New Surplus
Certs: Yes
CY4002 50 $410.00 $20,500.00
Description: COIL
Delivery: Immediate
Condition: New Surplus
Certs: Yes

Guy