Eliminate thunderbolt system ?

[kinger952]

Is it possible to use thunderbolt distributor to go back to points and cond. ?
Old school is the best for me .
I would love to get rid of the elect ign period ( I know don't ask ) so much easier for me .

 

[Scott06]

Of course find a points distributor that is marine rated and fits your engine. Toss TB distributor and module take 12 v wire off positive terminal of coil put appropriate resistance in to feed coil during run
You will need to pick up 12 v off the starter slave solenoid or starter to supply full 12 v to coil during cranking

Ok Gotta ask why ?

 

[kinger952]

Of course find a points distributor that is marine rated and fits your engine. Toss TB distributor and module take 12 v wire off positive terminal of coil put appropriate resistance in to feed coil during run
You will need to pick up 12 v off the starter slave solenoid or starter to supply full 12 v to coil during cranking

Ok Gotta ask why ?

I'm old school have worked with many point type distributors with NO ISSUES not like cdi which is hard for me to diagnose

 

[achris]

Is it possible to use thunderbolt distributor to go back to points and cond. ?

Simply put, no. There is no provision for a mechanical advance in the current distributor.

I'm old school have worked with many point type distributors with NO ISSUES not like cdi which is hard for me to diagnose

I get where you're coming from, but you won't find a points distributor for these engines. They don't exist, but as far as 'difficult to diagnose', Thunderbolt is about the easiest out there. It also took me a while to get my head around how they work, and now I do, they are very very simple.

Think of the sensor in the distributor as the 'timing' aspect of the points, and the module as current switching aspect of the points and you've got it nailed. The module does what the points do, switches the current running through the coil on and off. The sensor in the distributor tells the module WHEN to switch on and off. That's it!

Have a read of my document on understanding the system (link below) and look at the circus diagram... It's as simple a system as you can get.

Chris.........

How Mercruiser Thunderbolt ignition systems work.

Mercruiser Thunderbolt ignition systems. Mercruiser introduced the Thunderbolt IV onto their engines in 1982, alongside the introduction of the 1-R drives. The TB-IV system was used until the introduction of TB-V mid-way through 1996. Thunderbolt V was an improvement on an already exceptionally...

forums.iboats.com

 

[kinger952]

Simply put, no. There is no provision for a mechanical advance in the current distributor.

I get where you're coming from, but you won't find a points distributor for these engines. They don't exist, but as far as 'difficult to diagnose', Thunderbolt is about the easiest out there. It also took me a while to get my head around how they work, and now I do, they are very very simple.

Think of the sensor in the distributor as the 'timing' aspect of the points, and the module as current switching aspect of the points and you've got it nailed. The module does what the points do, switches the current running through the coil on and off. The sensor in the distributor tells the module WHEN to switch on and off. That's it!

Have a read of my document on understanding the system (link below) and look at the circus diagram... It's as simple a system as you can get.

Chris.........

How Mercruiser Thunderbolt ignition systems work.

Mercruiser Thunderbolt ignition systems. Mercruiser introduced the Thunderbolt IV onto their engines in 1982, alongside the introduction of the 1-R drives. The TB-IV system was used until the introduction of TB-V mid-way through 1996. Thunderbolt V was an improvement on an already exceptionally...

forums.iboats.com

Thank you I will keep it.
but this is not really helping me with my throttling up issue I'm stimeyed on it. I've been wrenching all of my life and this one has got my 63 y/o. tail

 

[achris]

If it helps, I'm 62, and if I can understand it, anyone can.

What's the engine (model, year, serial number) and what's the problem?

Chris...

 

[Scott06]

I'm old school have worked with many point type distributors with NO ISSUES not like cdi which is hard for me to diagnose

Agreed I like carbs myself but appreciate the electronic ignition. But as Chris lays out it is relatively easy to diagnose when understood

Thank you I will keep it.
but this is not really helping me with my throttling up issue I'm stimeyed on it. I've been wrenching all of my life and this one has got my 63 y/o. tail

So yo have an issue when you accelerate? As Chris mentioned lay out what the issue is and what you are working on may not be ignition related.
.

 

[kinger952]

Agreed I like carbs myself but appreciate the electronic ignition. But as Chris lays out it is relatively easy to diagnose when understood

So yo have an issue when you accelerate? As Chris mentioned lay out what the issue is and what you are working on may not be ignition related.
.

It is definitely spark related when I first moved distributor it ran strong on all 8 for a short while. I'm thinking advance is screwacky trying it tonight with timing light while throttling up

 

[achris]

I think this thread is about to dove-tail into your other thread, so I'll put a link to the other thread and close this one...

Idles great / misses when throttled up

Replaced cam shaft idles perfectly slowly gave throttle engine starts missing it is a electrical issue I turned distributor a bit and smoothed out - shut off started again same thing new cap/rotor wires pulled plugs all look fine but going to replace in the morning - any other ideas I'm...

forums.iboats.com

Chris.
iboats mod team