OzzyTom

I was looking at info on the Igniter III and noticed it has an adjustable rev limit feature.
I like the fact it is designed to fit under the dizzy cap, so it negates the need to bolt any other hardware in the engine bay.

I already have a tach drive HEI dizzy fitted to my engine, and it works very well, but I'm wondering if there is a replacement module (such as the Igniter III) which can be fitted to provide the adjustable rev limit functionality.

I guess I could restore my original distributor and add the Igniter module along with a new coil, but it would be a lot easier if I could simply fit a device inside my current HEI dizzy.

Can the Igniter III be fitted easily to an existing HEI dizzy?
or is there another rev limit device available for installation within the HEI dizzy?

Thanks in advance for responses.

jackson

you can install an external stand-alone rev limiter

or

both accel & msd did offer hipo 4-pin HEI module w/ on-board rev limiter'.

-add-
nothing personal or specific ... "thanks in advance" not as sincere

C3 Stroker

You can replace your module with this MSD unit;

http://www.summitracing.com/parts/MSD-83647/?rtype=10

OzzyTom

Thanks for the replies....
That's exactly what I'm looking for.

Significant difference in price between the MSD and Accel units ( $95 vs $140 ), and Mallory also has a module priced at $121 ???


MSD # 83647


Accel # 35373


Mallory HyFire #699

Does anyone have any personal experience (good or bad) with either of these units?

The MSD unit (cheapest) sets the rev limit via shorting a wire when engine is at half cutoff rpm, whereas the other 2 units use a pcb switch to preselect the desired rpm cutoff.
Selectable rpm via a switch would seem to be a better method, but I'd like some feedback from the forum from anyone who has used any of these modules.

Farmdawg

I do The MSD units are the ones that most of your Late Modle short track guys use when they are not allowed to run an MSD 6-t and Dist. Works great with the HEI and rev limiter hits really soft. Its a very good and powerfull setup. I run them for years.

OzzyTom

Finally got around to buying one of these and thought I'd provide some feedback.


MSD HEI HEAT module, pn MSD-83647

Installation was very simple and straight forward.
BUT
Programming the rpm limit was a bit of a pain, as it would not set when I was grounding the tach lead as shown in the instructions.
Mucked around for a while, even using a wire connected directly to the battery post to provide an alternate ground wire.
Eventually got it to set, so I went for a drive around the block to check it.

It does work very effectively.
Motor pulls strong right up to cutoff and then holds the rpm with an audacious sound of misfiring.
I need to check the accuracy of my tacho, as the needle stops about 600 rpm less than the set value...


Only issue now is I have developed an intermittent loss of power... feels/sounds like a momentary loss of ignition.

Cruising along at an easy pace, I get a sporadic momentary "Hiccup".

I'm thinking there may be a fault in this new HEI module.
No issues previously with the old module.

Anyone encountered any similar issues?

OzzyTom

For Sale....

1 MSD HEI rev limit module

I returned the HEI module to the supplier here in Australia.
They wanted to test it on their distributor to assess the problem.

Well sure enough they couldn't replicate my problem, so they sent it back to me.

I re-installed it, hoping that maybe it would be OK after my recent dyno tune found my advance curve was not right.

No joy.

Intermittent misfire has returned with this MSD HEI rev limit module.

I put the standard HEI module back in my dizzy, and the motor runs perfectly.

I'm not prepared to spend any more money on shipping this device interstate or back to the USA. Another lesson learnt.

If it aint broke, don't fix it.

bashcraft

Are you sure there isn't a loose connection somewhere?

OzzyTom

There's only 4 connections to be made....

Ground wire screwed to distributor body
2 wire plug to the pcb module
3 wire plug to distributor cap
and the switched +12V supply to the distributor cap.

Like I said, motor runs perfectly with a standard HEI module.
As soon as I drop this MSD module in, the intermittent misfire re-appears.
It occurs during steady cruising.... engine at about 1800~2000 rpm.

I pull it out, pop back the standard module... and presto. All good again.

If there's a loose "connection" it is in the module.
More than likely a bad (dry) solder joint causing intermittent issues due to vibration or thermal loading.

Not real happy about the situation, but located in Australia it makes it time consuming (and costly) to continue sending this item back and forth to get it tested.

I wanted a rev limiter for peace of mind... but I'm not willing to accept any reliability issues.
I'm not prepared to waste any more time on this MSD module.
As far as I'm concerned, it was a waste of money.