Meshikinquah

iTrader: (1)

I am looking for some info on the 500 and 525 ignition modules.

The two rear engines have the 525 (848823-2) ignition modules and then center has a 5F23A V8-HP ignition module. I am looking for any timing info and rev limiter info on these modules.

I am looking at doing all three the same so what would be the best ignition module to run on a triple 42 running 500 HP’S with CMI exhaust?



Thanks for any help

waybomb

Send me your email addy and I'll send you a TB IV and V manual. Has all you want to know wbaout TB ingnition, including curves and troubleshooting.

Meshikinquah

iTrader: (1)

Thank you for the info waybomb.


I found these two modules info and figure I would post them. I will post more as I find them so to help others also. Maybe someone has some to add.



MCM 502 MAGNUM/MIE 8.2
Identification Mark: V8-20R Module Advance: 20 Degrees Initial Timing: 8 Degrees BTD Total Advance: 28 Degrees


MCM 7.4L/MCM 454 MAGNUM/MIE 7.4L
Identification Mark: V8-24 Module Advance: 24 Degrees Initial Timing: 8 Degrees BTDC
Total Advance: 32 Degrees

Griff

What engines and ignition do you have??? Those are Thunderbolt IV modules that you posted specs on. Used only until about 1996-1997 on 500HP's and never on 525EFI's
The ignition modules you should most likely be running are the V8-HP's that came on early carbed 500HP's. You could also run the V6-14 modules which will give about 10* of advance on a V8.

Here's all the specs on TB IV modules

Meshikinquah

iTrader: (1)

Griff,
Thanks for the info….


My engines: Trip 500 HP’S with CMI exhaust

My modules: two rear engines have the 525 (848823-2) and center different style has a 5F23A V8-HP

Modules: (848823-2) Have MHP 525 SC paper label, on the back metal side stamped in ink 11S ___20A.

I do not see the 848823-2 on your list but as I looked at the back I am thinking that the 20A is the amount of advance. I am not sure what the 11S is??? This module is the square type with metal back.

The center engine has the 5F23A V8-HP which is mounted on the metal triangle bracket, different style plug than the others.

That is a nice chart with the advance curves. Would you have that info for the 848823-2?

Griff

Your part numbers do not come back to anything when looking them up. I can't tell what you have, but I can tell what you are supposed to have.
You should be running V8-HP modules. That is what came stock on carbed 500HP's.
You should also be setting the timing based on total advance of 32-34*. Stock HP500's get set at 12* base with 20* of advance.
Base timing really does not matter that much. Just set it for the correct total advance.

The 525SC stock module a V8-22A. It is the first V8-22 module on the curve table

Meshikinquah

iTrader: (1)

I have attached pictures of the modules.






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Meshikinquah

iTrader: (1)

525-SC V8 Thunderbolt IV 96-97 0K000012 & up 13524a1 na na 91019a3 848823t2 805443t

babalu

Race sterndrive 525SC gen Vl Thunderbolt V ignition module

should be 11 base and 20 advance

Griff

The pics are of TB V ignition modules.
There were some HP500 TB V modules for sale in the swap shop a few weeks ago.