V6 Ignition on a V8 Blower motor? Why??
 

Why do some V8 blower motors use V6 Ignition moduals? I checked my engines and noticed that I have thunderbolt V8 moduals on my KE800s. My engines run fine...what would change if I changed to V6 moduals.

Re: V6 Ignition on a V8 Blower motor? Why??
 

The V-6 modules only have 14* of advance.

It allows you to give it more initial advance.

It's generally done to help out idle quality.

Re: V6 Ignition on a V8 Blower motor? Why??
 

What engine adjustments are needed if this is done?
- Timing?
- Idle mixure?
- other?

Are there any drawbacks?

Re: V6 Ignition on a V8 Blower motor? Why??
 

Timing would have to be reset.

If you need, say for instance, 30* total,
you would set initial at 16.

It's always best to re-check it at over 3000 rpm
to see if the total is where you want it.

Idle speed will generally pick up, you
have to adjust the idle speed screws( throttle) back down
to a decent idle speed.

Idle mixture....everythings different,
I can't say yes or no.

The only drawbacks I could say, would be the
cost of the modules.

If you're not stalling when shifting into gear,
or dying at idle, I wouldn't change it.

Re: V6 Ignition on a V8 Blower motor? Why??
 

I ran the v-6 module on a pair of 454 blower motors with 174 b&m blowers , the motors run great . dyno at 536 HP at 5300.

Re: V6 Ignition on a V8 Blower motor? Why??
 

Regarding timing...couldn't I just set total advance @ 3000 and not worry about inital timing???

I really appriciate the replys...this is helpful. Another question...why would anyone build a blower motor with V8 moduals if the V6 work so much better?

Re: V6 Ignition on a V8 Blower motor? Why??
 

If your current engines idle fine, there is no reason to change them. The only reason to use the V6 module is so you can increase initial/base timing to improve idle quality.

A V6 module give 14* advance on a V6 engine. It only gives about 10* advance on a V8 engine.

Re: V6 Ignition on a V8 Blower motor? Why??
 

Thanks Griff!!
So what's the initial timing diff. between the V6 vs V8 modual on my 540c KE800SC motors???

I'm still not sure if I should make the move..but I like any improvement...is'nt there always a give & take to a good "mod"???

AND... why did KE build my engines with the V8s moduals in the first place if V6 moduals are the way to go.

Re: V6 Ignition on a V8 Blower motor? Why??
 

What Griff said.
Generally blower motors run less total advance than NA motors. So if your running 30 total with a 24 degree module, you've only got 6 degrees initial advance. That COULD cause idle problems, ie loading up, stalling out, etc. So with a V6 14 degree module, you set for 20 initial, 30 total. It gives you a much nicer idle.
If your idle is OK now, dont bother to change it.
Gary

Re: V6 Ignition on a V8 Blower motor? Why??
 

Do you know which V8 modules you have. There about 6 different ones. They all have different timing advance curves. They all give 20-24* advance, but it depending on which module you have, the full amount of advance may come in anywhere between 3000 and 5000rpms. I'm sure KE used that specific module for a reason and did some testing with others.
As long as the engine idles fine and doesn't stall when put into gear, I would leave it alone.

I'm guessing that you probably have a V8-HP module. This module gives 20* advance and timing is all in by 3000rpms. Thats just a guess though. Its about as close to V6 module as it gets.

Re: V6 Ignition on a V8 Blower motor? Why??
 

Very helpful, Thanks.

Are there any drawbacks to using a V6 modual?

Re: V6 Ignition on a V8 Blower motor? Why??
 

Well I tried the V6 moduals...just to see what would happen.

Like I said before I thought my idle was fine and I didn't have any problems other than "everyone" says go to V6 ignition.

Wow what a difference. Even cold my motor fired right up and idled and sounded way...way...smoother!

But now I have a new question...

My full advance timing (3500 rpm) was 32*. When we checked the V6 moduals 3500 rpm timing changed to 37*. We then reset timing to 32*.

Is the timing change normal for a modual swap?

My mechanic was confused. He thought timing would stay the same. Anyway I recomend the change. Oh yeah...I had merc V8 HP moduals before.

Re: V6 Ignition on a V8 Blower motor? Why??
 

If you dont make any changes to base timing(idle), total timing will definatly change when you swap the modules. Not to talk badly of anyone but the fact that this confused you mechanic kinda scares me. The only strange part is that total timing should have decreased with the V6 modules not increased. unless he played with base timng. What base timing are you running now? if you have 32 total I am guessing it is around 22 with the V6 module ?

Re: V6 Ignition on a V8 Blower motor? Why??
 

The mechanic I use locally is just a wrench (good guy) I use for easy stuff since I don't have time to do the easy stuff myself. Keith Eickert, Dean Nickerson and Mel Riggs is who I use as advisers (as well as this board). Inital timing was irrelevant to me because on my blower motors need 32* total advance. That is how my motors MUST be set...

Nobody told me what the change in total timing would be other than "everyone" said to check the full advance setting and adjust accordingly.

But...noone said what would happen...I'm not surprised my "wrench" didn't know...but...should it have changed like this?

Re: V6 Ignition on a V8 Blower motor? Why??
 

Yes you want to set total timing to where the manufacturer recomends unless you have ascess to a dyno and can do some tweeking on your own to find out what works best. But if they are Eichkard motors I'm sure they know what is best for there engines. Total timing is what you have to adjust for not base timing. Manufacturers have base timin specs becuase they know what the advance curve of the factory module is and if you take base timing and add module advance you will have total timing. And it is much easier to set base timing. You did the right thing by adjusting for the proper total timing but it would be nice to know what base timin is, all you have to do is check it with a timing light at idle. base timing is what he adjusted to bring total back to 32. Did he adjust idle speed after he did that ?

Re: V6 Ignition on a V8 Blower motor? Why??
 

Yes...idle speed was adjusted. But I was cleaning my bow at the time so i don't know was the change was... up or down. But We both were wondering if the full timing change was to be expected???

But I will say my motors never ran so good and I've owned these for 4 year now...

Re: V6 Ignition on a V8 Blower motor? Why??
 

That is very strange if all you did was switch modules. They should have reduced total timing at full advance and thus made you advance the intital timing more. The advancing of the base timing is what cleans up the idle.

Also, full advance on V6 module is usually all in before 2000rpms when on a V8 engine.