High Energy Ignition (HEI)

[cineman]

Funny then that the numbers cast into DeLorean parts like the intake manifold, sump and more are actually Renault part numbers.... even the camshaft numbers Bill has posted in his Volvo literature are traceable Renault numbers....!

Yeah, check out Renault's performance today....

Yes, you are right: every part number on the PRV is native Renault (77...79 etc )
I would like to really know the economy partecipation of all the members of the PRV association at the time: for me appear that Renault did quite everything and got the more.
What i was meaning is that the parts on Delorean engine, at least the top end, was used directly just by Volvo at the age. heads, pistons... just Volvo had the 2.8lt engine at the time, renault got it more later.

Also, this is a scan of the rare document i got. The contract for the engines from Delorean was made directly from Renault, this was confirmed by me by some french guy wich visited the Douvrin factory and know some of the old manager and also by Nich Sutton in N.Ireland, who told me that Renault was the only company to get all the money after the closure of the delorean factory, just because they signed the contract in some way directly with JZD. This is the Renault documents "PR" "Piece de Rechange" for the Delorean engine and parts from them. I have 32 page on this.

Look what i was talking about: the first 126 engines got some different parts, like the ignition distributor "017" wich was directly used on the Volvo 264... and than came the quiter "023" we have. And there are lot of other difference in cams, heads, pistons...
Well.. i find it really exciting, dont ? Would be interesting to confirm it by seeing some of the Proto car engine and checking the numbers...

mot002a.jpg

mot027a.JPG

[DCUK Martin]

Now that's how to mutli-quote! Thanks Martin!

It's really easy, just quote and reply as normal to each post, then instead of clicking on "submit", cut and paste it into Notepad. Keep doing that with every repply, and cut back out of Notepad into the last one. Simples!

Because real engineers, who build ignition systems for a living, disagree with you?

Bill, they are talking about the spark duration required to ignite the mixture, not the power required for the spark to fire. NOT THE SAME THING!

BTW just for once, let me say it: I -am- a qualified professional engineer. Twice over in fact.

The plug will spark at whatever voltage is sufficient to bridge the gap, no matter what the 'maximum output' voltage of your coil is, no matter what your compression ratio is, and no matter what your A/F is.

Let's not confuse Bill. I agree with you entirely that the voltage will stop climbing the moment it's reaches the required level. However, just to be clear for Bill's sake, increased pressure reaises that level.

[Ron]

Let's not confuse Bill. I agree with you entirely that the voltage will stop climbing the moment it's reaches the required level.

Why didn't someone tell me!!! I must have told him 10 times in as many threads...
I'm sorry Bill.

[content22207]

The converse is also true: if your plug gap is too wide, maximum coil output voltage will be reached before it is sufficient to jump the gap, and the plug won't fire. If you don't believe me, just gap your plugs .05" and leave the rest of ignition stock, then try to drive the car.

Stock DeLorean ignition is incapable of reliably jumping .05" plug gaps -- period.

All the theory in the world isn't worth two cents when your engine is misfiring all over the place.

Can I hear an "Amen" from anyone who has actually tried to do so, versus the armchair theorists.

Bill Robertson
#5939

[stevedmc]

The converse is also true: if your plug gap is too wide, maximum coil output voltage will be reached before it is sufficient to jump the gap, and the plug won't fire. If you don't believe me, just gap your plugs .05" and leave the rest of ignition stock, then try to drive the car.

Stock DeLorean ignition is incapable of reliably jumping .05" plug gaps -- period.

All the theory in the world isn't worth two cents when your engine is misfiring all over the place.

Can I hear an "Amen" from anyone who has actually tried to do so, versus the armchair theorists.

Bill Robertson
#5939

YEAH, I tried it and it didn't work.

YEAH, I told them that.

YEAH, they won't listen.

[DCUK Martin]

The converse is also true: if your plug gap is too wide, maximum coil output voltage will be reached before it is sufficient to jump the gap, and the plug won't fire. If you don't believe me, just gap your plugs .05" and leave the rest of ignition stock, then try to drive the car.

....

All the theory in the world isn't worth two cents when your engine is misfiring all over the place.

So here's a novel thought:

Leave it alone

It's perfectly reliable working as designed. Point made.

[content22207]

Stock DeLorean ignition is functional (most of the time), not optimal.

I prefer optimal performance over merely functional performance, just like nearly every other automobile manufacturer in 1981 (and since, to this very day), so:

I upgraded my ignition to 1981 (and since, to this very day) General Motors standards.
I upgraded my ignition to 1981 (and since, to this very day) Ford/AMC standards.
I upgraded my ignition to 1981 (and since, to this very day) Chrysler standards.
I upgraded my ignition to 1981 (and since, to this very day) Toyota standards.
I upgraded my ignition to 1981 (and since, to this very day) Datsun (Nissan) standards.
I upgraded my ignition to 1981 (and since, to this very day) Subaru standards.
I upgraded my ignition to 1981 (and since, to this very day) Honda standards.
I upgraded my ignition to 1981 (and since, to this very day) Mitsubishi standards.

The best part of my upgrade: the high winding ignition coil that made it possible cost *LESS* than a Bosch Blue coil.

Icing on the cake: My coil was Made in USA by an American corporation, not Made in Brazil by a foreign owned corporation (Bosch coils are Made in Brazil now).

When you get right down to it, I wanted my PRV to perform at least as well as a 1988 and later PRV, so I upgraded my ignition slightly beyond the same specs Chrysler used on the Premier 3.0.

Bill Robertson
#5939

[sean]

Stock DeLorean ignition is functional (most of the time), not optimal.

I prefer optimal performance over merely functional performance, just like nearly every other automobile manufacturer in 1981 (and since, to this very day), so:

Got a follow up question about this in you carb thead.

[content22207]

The fact that nearly every automobile manufacturer was already using HEI in 1981, and the fact that they have continued to use HEI to the present day, evidences two facts:
1) HEI was not a passing fad -- when DeLoreans were new in the showroom it was already established as the ignition standard that has never gone away
2) HEI is independent of fuel delivery -- manufacturers have used it on carbureted and electronically fuel injected engines alike

Bill Robertson
#5939

[dn010]

What did Volvo use on their K-jet setups in the 80's?