Rotary Car Club - Mount coils directly to the plugs

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- RX-7 1st Gen Specific (1979-85) (https://rotarycarclub.com/forumdisplay.php?f=38)

- - Mount coils directly to the plugs (https://rotarycarclub.com/showthread.php?t=18248)

I remember a post way back when where someone fabbed up exactly what you are wanting
to do except for the HEIs. It worked ok, just added weight and made it hard to route some
stuff on that side of the engine.

I will say that anytime you can reduce a wire length it will help with the spark. Basic
physics there. Thats why OEM are engineered with smaller coils, they don't need a whopping
huge coil to drive the spark when they are direct connected like that.

I'll see if I can find the post on it.

This is the picture I was thinking of: http://img375.imageshack.us/img375/4082/cop3.jpg

Do a google search rotary coil on plug to see other examples. The Ausies seem to be doing this a lot. Maybe Rice will chime in on it.

This is Rice Racing he Loves that setup and I am a shitcunt!

Edit:

Quote:

Originally Posted by RICE RACING (Post 110044)

Overall? I wanted single turbo as its more reliable than twins. All the other stuff to do with data collection was for my own development stuff (I must put up the VBOX equipment and logs).

The ignition system set up was a thing I wanted to try myself (I currently do not run this due to a compatible issue with the ECU type I run and CDI ign systems so at the moment the trusty HKS DLI is installed with stock coils/wires etc). The idea is to have massive spark current/voltage and limited RFI (which I achieved) however CDI systems do not work as well as inductive at light loads and low rpm *even with multi spark* (HKS is superior), at the moment with my 50/50 water to methanol mix at 500cc/min the HKS DLI works perfectly and the car runs better on this ign than the race CDI spec set up so that is why I changed back from my expensive time consuming custom CDI coil on plug set up. *This pictured system does though fire a much stronger water only injection set up at almost double the flow rate* but due to my Link ECU not working with it (any similar full CDI system, tested with Motec, M&W, Dynatek) on the activation of a rev limiter or boost limiter its unsafe to run in all conditions.

All the other system parts IC set up, carbon air box etc are factory SP items on this very race car so wanted to retain the stock look of the car. My performance goal with it was to match a Ferrari F40. Looking to obtain ~500bhp *engine power* and a responsive engine to get to do 128 to 130mph trap speed in the 400m or 1/4 mile measurement with normal road tires (no quasi drag stuff needing burn outs etc etc).

She is set up as a road race car as you would call it.

Hope this gives a general over view.

Peter

I did not 'ditch' the set up:

The quote was attributed to a BS ECU that had a fatal flaw in that it was not tolerant to CDI ign for some reason (Link/Vipec G4 ECU) on the action of limiters. They paid me $7500 in compensation for their own fuck up which was NEVER EVER rectified despite numerous firmware attempts to fix the problem.

In the end I ended up turning off all limiters and going back to my superior CDI system, pictured above.

It works great :)
The POS ECU was turfed a long time ago LOL.

Quote:

Originally Posted by RICE RACING (Post 283634)

Well Mr I don't update my thread so I can't give credible information.:lol:

Thanks for clearing that up smecksy!

Edit:

Never mind you did update it! Foot in ass.

Also :rofl: giving poor Sean shit..

Yep, just read it shitcunt, over 83,000 people have LOL.

Quote:

Originally Posted by RICE RACING (Post 283640)

Yep, just read it shitcunt, over 83,000 people have LOL.

I am 3,500 of those people.:rofl:

Quote:

Originally Posted by chibikougan (Post 283641)

I am 3,500 of those people.

I think me and Mitch might be the other 80,000...

lol

J.

Just to be a shitcunt only 33,000 have read it.:rofl:

Stick a Vbox on that and analyze the data!:cheers2:

Ok here is what I did.

I took an old barely used set of aftermarket plug wires I had from a previous TII. I removed the boots on either end of 1 plug wire and removed the metal clips that snap onto the coil and spark plug. I then shortened the spark plug side clip to about half the length, and then cut off the 90* turn from the coil side. I then fused them together using TIG with no filler. For a boot, I cut down the spark plug side strait boot to the right length. and wa la... Coil on plug boot.

I am half way through making the moun for the igniters and coils. I'll updatye when that is complete...

PICS!

http://i282.photobucket.com/albums/k...ps21ccab63.jpg

http://i282.photobucket.com/albums/k...pscc4b8509.jpg

http://i282.photobucket.com/albums/k...ps910adc94.jpg

Schweet!

I now dub these coil condoms!

Here's an update for my coil on plug set up.

I used two plates of 3?16" aluminum and machined them to fit then welded the two plats together. Because

of the weight of the coils, I used pressed fit stainless steel threaded inserts. I redrilled and

counterbored the coil to use 10/32 cap screws to be the exact length to not sit flush with the backside

of the mounting plate.

The igniters mount directly under the coils hidden away on the opposite side. Since these are so light I

just threaded the plate and used 8-32 cap screws. I milled the cap screws down to also be the exact

right length to not stick out, not just for looks. But they would hit the coils if sticking out past the

mounting plate.

The fins were milled then beveled to aide in the heat dissapation as well as to add some asthetics.The

hole you see in front of the coils on the bottom plate is for the wires to go from the coils to the

igniters. These wires will not be seen when looking from above. The wires that from to anf from the

dizzy will be ran across the bottom side and will also be completely hidden. I will show this in my next

update.

So far I am liking the outcome, I have only the two mounts left to make. I already have one drawn up, I

just need to mill it.

Pics...

A shot of the coils and igniters prior to welding it up to check for fit. And a shot of the SS inserts,

slots, and counterbore work:

http://i282.photobucket.com/albums/k...ps0e13d677.jpg

http://i282.photobucket.com/albums/k...ps18ca6940.jpg

http://i282.photobucket.com/albums/k...ps688ae566.jpg

http://i282.photobucket.com/albums/k...ps521414f5.jpg