What are options for twin plug for EFI?

[Porschekid962]

Distributors and mfi pumps are for the historically aligned. Also those who want to plug and forget for the most part once they finally get their product. Electronics on the other hand are far and away the wave of the future and it has been here for years.

If you want performance and the ability to be able to change your setup without needing a new custom mfi cam pump then go efi. If you want old school nostalgia then by all means opt for a dizzy and mfi pump or carbs. AFAIK most motorsport teams went to efi in the 80's in order to better control fuel delivery and increase efficiency. Group C rules pushed fuel efficiency. MFI pumps were great in racing and WWII but modern electronics have surpassed them in every way.

If you want to build a flexible motor, put out good numbers, have the ability to change on the fly and save money than you better go with total electronics.

Distributors are ok for spark but go with a later twin rotor unit instead of a one off 12plug piece for replacement parts sake. The money isnt worth it unless your a concourse nut job.

Best of luck and hopefully you make the most power you can.

[beepbeep]

Hello!

Yes, 500$ can buy you a Yugo, a car that will take you from A to B. It will also buy you a distributor cap to antique and obsolete ignition system or a fully functional and programmable EFI with built in ignition.

I don't understand why would someone want heavier, mechanical, non-adjustable and less reliable ignition system just beacuse some racer car happened to have one during the 70's??

Porsche themselves converted to EFI as soon as technology was mature enough. Motoronic was used on 956's and 962's troughout the 80's. TAG McLaren F1 cars used EFI from beggining of the 80's.

There is no point of using dizzy nowadays apart from nostalgia value. Unfortunately, many good mechanics are still pushing old stuff. Probably beacuse they didn't catch up with electronics.

[afterburn 549]

Thats what I think too..they have to be hvy and hang out on the back of the eng is the wrong place for a P car. the rear is where the problem is so anyway to move it forward is a good thing.
I have to admit they look cool...but for adjustability a management sys. is the place to be. J.M.O.

[BURN-BROS]

Originally posted by beepbeep


There is no point of using dizzy nowadays apart from nostalgia value.

Goran,

Using that same argument one could say we should get rid of our old, obsolete cars in favor of a fancy new Honda.


Guys, JoeMag obviously has enough discretionary income to consider the Motec so let's get back on topic and quite beatin yer chests

JoeMag,
The blade on the rotor is based off of the Jaguar rotor that used electronic timing. I retained this feature just in case. A custom dizzy can be made to do what you are asking. You will not be able to use super high voltage.

A distributorless ignition system will allow for more secondary voltage and wider plug gaps. It will also promote increased wear to the secondary ignition components.

It will boil down to your personal preference since each choice has it's own virtue and vice.

Cheers everybody!

[Turbo_pro]

I am not an expert but can anyone tell me which Porsche engines that had twin plugs 1966-1997 used anything but a distributor.
In my research it looks like all two valve/twin plug engines used a distributor. For that matter which Porsche two valve engine used anything but a distributor?
Motronic, or engine management in general and distributor are not mutually exclusive.
I believe most Motec systems I have even seen use a distributor.



IMHO: afterburn, your envy is showing. It seems half your posts attempt, feebly to attack other people.
Why is that?

[afterburn 549]

1/2 my post ?? you certainly embelish that number. Feebly ? when wrong is wrong and to say nothng would be -feeble -. I dont call people names, I calls em as I sees them, just the facts please.
Lots of people use this board to get their education, some use it for their agenda.

[BURN-BROS]

Afterburn,

First let me say that I am sure you are a decent guy, most Pelicans are. I believe that somewhere down the line Henry has offended you. Your agenda now seems to be continuing to grind an axe at least when it comes to Henry. Can't you guys just hug and make up??? Please, for the rest of us.

[Turbo_pro]

Loser, ...........plain bull headed and stupid. .......... silly. .......self consuming ,non carinng, money orentated, self obsorbed tunnel vision...........

Originally posted by afterburn 549
........... I dont call people names, I calls em as I sees them.............

World class engines builders come to this forum to offer their advise and you offer criticism and venomous attacks.

"Call them as you see them " ? I think the algae on your aquarium is too thick to see through.

Afterburn: the result of too much hot sauce ?

[Henry Schmidt]

Aaron (Burn-Bros) you could be right.

afterburn if I have offended you, I apologize.

Solowerks makes a great point.
I wish to know if there were any Porsche two valve engines built with anything but a distributor.
Even the last 993 with Varioram EFI had a distributor.


Here are a few Late engines with twin plug distributers.

[beepbeep]

Today, I bought a complete MegaSquirt II + all extras for 530 bucks just to play with it on my next project car. If you want to solder it yourself, it will probably cost half of it.

It has a built in MAP, can run low-impedance injectors nativly (Flyback PWM for peak-and-hold is built in), accepts input from my WBO2 and has Autotune feature.

Now the good stuff: it can run single-coil and distributor nativly (in case you would like to keep that dizzy) or interface with Ford EDIS.

One of those connected to twin Ford EDIS-6 is THE least expensive way to do it. Two EDIS-modules from a junkyard are probably cheaper than one NOS distrubutor.

That would give you fully programmable twin-plug EFI + ignition for less than 1000 bucks (hell, less then 500 if you want to assemble it yourself).

Sure, it is batch fired and doesn't have fancy features but is perfectly good solution for N/A engine.

GUI-based software is also available online for free.

You want to keep it retro-chic with twin plug dizzy? No problem, buy Aarons jag dizzy and you don't even need EDIS modules, just twin coils and you are good to go

P.S. No watercooled 911's use dizzy's...it's all coil-on-spark stuff. Why didn't they use it earlier? Dunno...maybe beacuse they were conservative. They clinged on K-Jetronic at least 8 years too long as well

[BURN-BROS]

Very good and informative write-up Goran.

the Coil in spark stuff is great as it eliminates all problems associated with the incredible amounts of voltage being produced today. Some cars have coil voltages around 90,000 volts to run the heated film defrosters...yikes.

[89turbocabmike]

One reason I've considered using Henry's 12 plug distributor on my stealth efi build is the thought that my smog tech will be less freaked out seeing a 12 plug distributor, than none at all. It's nice to have options, thanks Henry and Aaron

[beepbeep]

Yeah, you can always controll dizzy with aftermarket EFI and make it look stock.