Twin Plug Install Continued
 

Installed the MSD's and coils and related wiring for my twin plug upgrade. Trying to be ready for testing at Willow Springs on the 13th of Dec. If time permits, some Dyno tuning at Vision Motorsports.http://forums.pelicanparts.com/uploa...1164651111.jpg http://forums.pelicanparts.com/uploa...1164651132.jpg http://forums.pelicanparts.com/uploa...1164651148.jpg http://forums.pelicanparts.com/uploa...1164651164.jpg http://forums.pelicanparts.com/uploa...1164651179.jpg

Subscribing - because I may be twin-plugging my engine soon, and know next to nothing about it.

Can you post some details about the distributor? What type is it?

Why twin MSD boxes and coils? Is this a common set up?

Thanks.

SmileWavy

I'm also going to be following this one. Do you have a thread on the building of this car? Have you re-routed the fuel lines from the tank?

More pictures of the bare engine compartment would be greatly appreciated!

Looking GOOD!

Looks Great Mark.. Are you excited???? Like me.

Go to jbracing.com, talk to Mike Bruns. They are a wealth of information.

I will try and post more photos tomorrow.
Sorry no thread on the build up of this car. It has been abn ongoing process for 8 years.
The fuel lines to go back to the tank, thats how the PMO fuel regulator likes it.

You have to use seperate CDI and coils in order to twin-plug. One for the top plug and one for the bottom plug.

If you only used one CDI/MSD and one coil and then tried to send the charge to both top and bottom plugs what would happen is only one plug would fire because the high tension charge would chose the path of least resistance and go that route to discharge leaving the other plug with no charge.

This is not unlike a lightning bolt that chooses the shortest path to earth like a tree or building and discharges. You need two lightning bolts to hit two targets.

There are people who will argue one way or the other on this but some folks are firing 2 coils with a single MSD box. I have no direct experience doing that but I have read a few post from people here who are doing it.

Cheers

Very nice Mark, and I like your throttle-cable. What are you using for a fuel pump, and where's it going?

Holley Blue pump, up front. Remember this is already a "sorted" race car. The only improvements this time are twin plugs and GE80 cam up from a GE60.

I've heard the same too. You can drive a twin plug engine with a single MSD/Crane ignition unit driving two coils.

Good point. I erroneously grouped the MSD in with the coils in my post when I should have only said that seperate coils must be used.

Installed sheet metal, mounts. made holes for the "lower" plug wires. Just waiting on wires. Should be "alive" this weekend.http://forums.pelicanparts.com/uploa...1164835227.jpg

Well, ready to put in the car. Thanks to the guys and gals @ JB Racing! The customer service was excellent. I like how they advised me to use 2 colors of wires, black for bottom and red for the top plugs. I am pleased with the final "look".http://forums.pelicanparts.com/uploa...1165014373.jpg http://forums.pelicanparts.com/uploa...1165014383.jpg http://forums.pelicanparts.com/uploa...1165014393.jpg http://forums.pelicanparts.com/uploa...1165014402.jpg http://forums.pelicanparts.com/uploa...1165014420.jpg http://forums.pelicanparts.com/uploa...1165014434.jpg

Mark. Looks great. However, You need to replace the Engine support bracket. Not only can I see the weld repair you did not even try to paint it to cover it up. What happened to your attention to detail? LOL..

great job on the motor.

It just needs to be re powder coated, I went too radical on the lightening and had to repair it by adding gussets.
If all goes smoothly I should be driving it around the neighborhood tomorrow or Sunday.

That sure is a purdy motor! I really like the idea of color coding the plug wires.

Buy one of these.
http://rennline.com/product.php/sid/5/aid/64/auto/Porsche/prodid/23

She came to life yesterday. What a difference! Drove it around the neighborhood. No leaks, Willow Springs on the 13th.................yippeeeeeeeehttp://forums.pelicanparts.com/uploa...1165163548.jpg http://forums.pelicanparts.com/uploa...1165163560.jpg http://forums.pelicanparts.com/uploa...1165163577.jpg

So THAT was what all that sweet noise I heard was coming from behind the hallowed gates in Coto...:)

Your motor/car is beautiful, it looks light as a feather...:)

We should have a beer sometime at Wings on the lake in RSM...SmileWavy

Ralph

Ralph,

Lets get together soon. Send me your phone #.
They have a car show the 1st and 3rd Saturdays of the month at the Coto Valley Country Club. I am going to drive my race car over on the 16th of DEC. Let me know if you can make it, I will put you on the "list"


Mark

Hi Minkoff,

Any update on going to GE 80's from the 60's?

I would guess the twin plug w/ the 80's are sweeeeeeeeeeeet!!

Are you using any heat shielding on your lower valve covers?

Bob

No Heat Shielding, the 80's vs. the 60's gave me much more top end. The car ran great all weekend at the CA Speedway.
I gained 3-4 seconds per lap from the last time I ran there

That is unbelievable! That much of a time saving? Are you running the engine between 5500 and redline ALL THE TIME???

What kind of speed/lap was it previousley vs. now?

Sounds great!! Would this be a little peaky for the street ;-)

Bob

Always between 5000-8000 rpm's
this is definitely not a street motor.