34 replies to this topic

[mugginz]

I'm looking at what to do as far as ignition for a red 253 in my LH.

 

Getting hold of an actual Bosch HEI in decent condition might be a bit of a challenge so I'm considering converting the points dizzy to a breakerless one with a PerTronix 1885 Ignitor.

 

It's instructions mention that it's only compatible with a points style coil with at least 1.5 ohms on the primary coil.

 

I was going to use a Bosch HEC716 which is what's used with the Bosch HEI dizzys so now I'm not sure that coil would be compatible with the Pertronix module.

 

Has anyone got a HEC716 laying around that they can test the resistance of?

 

If it's in the 1.5 ohm or greater range I might give one a go.

 

From PerTronx -

 

1. The Ignitor is designed for 12-volt negative ground systems.
2. The Ignitor is compatible only with a “resisted style” coil. Eight cylinder engines require a minimum
   of 1.5 ohms of resistance. Six & four cylinder engines require a minimum of 3.0 ohms of resistance.
3. If your Ignition coil has the proper primary resistance, remove or bypass all external resistors.
   Do not remove resistors if the coil primary resistance is lower than specified.

 

Any help appreciated

[mugginz]

If I'm prepared to open the wallet a bit wider for a PerTronix 91885 Ignitor II it'll work with a coil of .45 Ohms to 1 Ohms preferably, but just about any coil above .45 ohms so that might be what I need depending on what a HEC716 reads resistance wise.

Edited by mugginz, 09 December 2018 - 10:31 AM.

[hanra]

Put your multimeter on the coil you have now and measure the primary winding. I run my stock Bosch dizzy with a Pertronix module and stock Bosch coil.

Edited by hanra, 09 December 2018 - 01:06 PM.

[mugginz]

The coil I have at the moment is at least 30 years old so I wanted to maximise spark with a new HEI coil.

How have you found the PerTronix module? I'm guessing it's be pretty straight forward to install.

[hanra]

Google the specs on your intended coil and see what the primary winding resistance is.

I’ve used Pertronix modules for years. Only one I’ve killed, I was using an incorrect coil.

Very simple install.

[mugginz]

Tried to find the resistance of a HEC716 via Google this morning before I left home but had no luck. When I get back home I'll have another stab at it.

[hanra]

I'd be inclined to just use a run of the mill coil that suits the pertronix module.

[mugginz]

As long as a run of the mill coil can supply the extra power.

A breakerless ignition system is a win in itself but is only half the benifit of a HEI ignition. The rest comes from the coil.

[mugginz]

Finally found the resistance for the HEC716

 

0.41 ohms as reported by http://360.haubits.n...ition Coils.pdf

 

Documentation for the 91885 says to use a coil with a minimum of 0.45 ohms which is pretty damn close but I've opened a support ticket with PerTronix to see what they say about 0.04 ohms

[Dr Terry]

In my experience the Bosch HEI coil (HEC716) will run the standard Pertronix module too hard & burn it out. You are better off using an MEI ignition coil like a MEC723 or MEC717.

 

Dr Terry

[mugginz]

Yeh, the PerTronix level 1 is only good for a maximum of 1.5 ohm when used with a V8 and the HEC716 is 0.41 ohm

The level 2 PerTronix module is good for 0.45 ohm which is pretty close to the 0.41 of the HEC716 so before I go for less coil output I thought I'd ask PerTronix themselves but being an American company I guess I'll not get a response from them before tomorrow sometime at best

[hanra]

I’ve got an email here for George if no one replies to you.

[mugginz]

Cool. That'd be much appreciated.

Just got back from Bursons. They want about $300 for the 91885. Can get it shipped from America a fair bit cheaper but at least the $300 unit's in Melbourne I spose.

More worrying was that Bursons' supplier reckons the 91885 needs a .6 ohm coil whereas the PerTronix doc says .45 ohm so that's a bit confusing. Ready to drop the money on module and coil but need to make sure of compatibility first.

I like the idea of the Bosch coil cause it's nice and compact but I might have to grab something like the PerTronix coil which should perform roughly as good.

[hanra]

Sorry it was Marvin Grebow Jr.

[email protected]

I’ve always bought mine from Matt @ Ponderosamustang on eBay.

Matt Rosa
Ponderosa Mustang
850-857-1084
[email protected]
www.PonderosaMustang.com

Edited by hanra, 10 December 2018 - 09:15 AM.

[mugginz]

Thanks hanra,

 

Have emailed Marvin on the resistance issue and sent a price and availability enquiry to Ponderosa Mustang.

 

Hopefully will have a response in the near future.

 

mugginz

[mugginz]

Just placed the order with Matt at Ponderosa Mustang.

 

He was very helpful and price was very sharp.

 

Thanks hanra, you've saved me both money and hasstle

 

mugginz.

[hanra]

Nice. I've always found Matt to be cheapest. And yes, helpful.

[RallyRed]

Cool. That'd be much appreciated.

Just got back from Bursons. They want about $300 for the 91885. Can get it shipped from America a fair bit cheaper but at least the $300 unit's in Melbourne I spose.

More worrying was that Bursons' supplier reckons the 91885 needs a .6 ohm coil whereas the PerTronix doc says .45 ohm so that's a bit confusing. Ready to drop the money on module and coil but need to make sure of compatibility first.

I like the idea of the Bosch coil cause it's nice and compact but I might have to grab something like the PerTronix coil which should perform roughly as good.

Hi mate,   ....cant answer your question directly.

But having just fitted a Scorcher electronic dizzy and coil to my LJ 202, and then wanting a Pertronix digital rev limiter as well, I can say that I also went to Bursons     ( as the listed Pertronix agents) .

Bursons pricing seemed excessive, so I rang Pertronix in Melbourne directly. They were happy to sell and post direct to me.

 

You may save some $ dealing direct?.

 

and.....now I see the Ponderosa post....duh.

 

I always try and support the local shops, but they need to be fair regarding markup etc.

Edited by RallyRed, 10 December 2018 - 12:24 PM.

[mugginz]

True. I'll support local even if they're a bit over the odds but when there's a 30% or more difference it's hard not to go with the cheaper price. Though I will say I didn't think to ring PerTronix Melbourne directly but I assume that's who Bursons' was talking to when I was in their store.

Maybe if I could've skirted around Bursons' markup I would've gone with them instead

Edited by mugginz, 10 December 2018 - 12:30 PM.

[mugginz]

Just got advise back from PerTronix that the Bosch HEC716 will be fine with an Ignitor II module.

[RallyRed]

True. I'll support local even if they're a bit over the odds but when there's a 30% or more difference it's hard not to go with the cheaper price. 

100%

[kudu]

Does anyone know any experts that have installed these? I have brought a 91885 module for my Bosch Distributor. However the adapter plate it says should fit flat. However on the base plate there are 2 tiny metal bumps that cause it not to sit flat. Now the instructions say not to alter the base plate. But I'm wondering if it would be fine to just file them off?

 

Any ideas or experience with this?

[mugginz]

I had to slightly modify the mounting plate on mine but can't remember exactly how much I took of off.

[kudu]

I had to slightly modify the mounting plate on mine but can't remember exactly how much I took of off.

OK.. That gives me some hope then.. As long as it still works!.. Which in my mind it logically should.. As it does not effect anything.  IMG_20220728_185056.jpg   89.71K   0 downloads

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[mugginz]

I figured I'd modify the plate of the petronix unit rather than the dizzy as I could get a replacement petronix easier

If I remember rightly I removed a bit of the petronix plate to go around the obstruction on the dizzy