Ignition Type?

[sub2010ss]

I have been struggling with this for awhile now. My original engine was a 2 barrel carb 5.0 without a knock sensor, serial number 357725.

After I installed the 5.7, I used all of the original components minus that intake and carb. So the ignition system is original to that serial number.

My question is, which style thunderbolt ignition module do I have, and does it have a RPM limiter built into the module?

I posted about a few top speed runs that I made and someone said there is no rev limiter on my engine and that it is a fuel problem yet the RPM is at 5200 RPM by the boat tach and the sound is very similar to what I am used to with an automotive limiter, i.e. ignition cutout, pop pop pop.

Also to add, I believe my fuel system is keeping up as I have solid fuel pressure and nearly new components.

 

[Bondo]

Ayuh,... Aren't there letters at the beginin' of the serial number,..??

If it's a T-Bolt IV, there's No rev limiter,....

If it's a T-Bolt V, I believe it also don't have a rev limiter,.... though they did come with, 'n without a knock sensor,...

To my knowledge, Only the Efi/ Mpi motors have a rev limiter,....

 

[sub2010ss]

That's a good question. I saw others with letters and haven't looked again to see. Ill have to look at the module and for a part number and see if I can't refer that back to IV or V.

 

[sub2010ss]

Just found this and it has lots of useful info.

http://www.boatfix.com/merc/bullet/94/94_02.PDF

 

[sub2010ss]

Ok, with enough research, got to love the internet, I found my module. The part number on it is 861459 and it is a TB V, which does have a limiter, which makes me feel much more confident it what was happening at 5000+ RPM. Also, I've learned I set the timing without using the procedure of grounding the purple and white wire (#13). So who knows where I am actually at for timing. Also these bad boys have some sort of idle timing adjustment, so to properly set the idle, #13 also has to be grounded. All good info as I didn't do any of that. And now I understand why timing jumped around so much and why the idle was hard to pinpoint as well. What a good day of research!

Another useful link
http://www.boatfix.com/merc/servmanl/16/16b4r2.pdf

 

[Bondo]

and it is a TB V, which does have a limiter,

Ayuh,.... Thank you,.... I learned something again today,......

 

[sub2010ss]

I teach nuclear power operations as my side job lately as I learn about boats!