thunder bolt 4 coil
 

Is there anything special about the TB4 coil ? Can I replace/ substitute with msd coil and keep my Distributor and module?

Re: thunder bolt 4 coil
 

I replaced mine with MSD and kept the old one on the boat as a spare, just in case.

Re: thunder bolt 4 coil
 

yes you can replace simple swap out

Re: thunder bolt 4 coil
 

cool,... I didnt know if mercury had some special incompatable set up.
Thanks,
Tom

Re: thunder bolt 4 coil
 

Any benefits to the MSD over the TB4? I just bought a boat with slghtly built small blocks and TB4s...Thanks

Re: thunder bolt 4 coil
 

the msd has stronger current which translates to better burn



(the simple answer)

Re: thunder bolt 4 coil
 

On my 383 I swapped the Tbolt coil that I was told was a 40,000 volt coil for a Jacobs 60,000 volt coil. It looks nice but did little to nothing for performance, 90% of the engines just do not need the extra zap. Tbolt is pretty decent setup don't let anyone BS you.

Phil

Re: thunder bolt 4 coil
 

If you use an MSD coil make sure it is the 'high vibration coil' or it will not last long. The only time a coil change will help performance is if the old one was weak.

Re: thunder bolt 4 coil
 

Like my Uncle Melvin use to say "You don't need a forest fire to light a cigarette, when a match will do".

Re: thunder bolt 4 coil
 

thanks guys, the one I have has physical damage. It works well but I'm not sure if it's working as well as it could.