Mount coils directly to the plugs
 

so I am not using a traditional coil on plug piece. I am using an MSD SS coil on a my 12a for direct fire set up using HEI igniters (TFIDFIS). I want to mount my coils directly to my spark plug. But the only straight boots I can find are for coil to wire.

Anyone know where I can find a coil boot that will let me go straight from coil to spark plug?

I don't know if this is a good idea...

Electronics do NOT like:
1) Heat
2) Vibration

Putting the coil on the spark plug just increased both.

The only way to combat this physics is just reduce the mass...
This is why Coil-On-Plug designs (for OEM) use a pretty small coil.
So, you're just reduced your coil performance just to get rid of the spark plug wire???

I'd rather run a honking, big coil and run traditional spark plug wires...

Unless you're RICE RACING with a LOT of money! :D


-Ted

I don't see how they will see any more heat or vibration than mounting them on the strut tower as is normally done. Or on the motor which is often done.

Realistically the difference is a few inches, so the heat problem is a non-issue. Since these coils will be mounted on a plate which is attached to the motor. There will be no movement difference between the plugs and the coils.

After heavy searching, I have come to the conclusion that they do not make a boot for this. So I guess I will be making my own.

Let me get this straight...

You want to mount your coils onto something other than directly onto the engine / spark plugs?

You don't want to use spark plug wires?

Does that sum everything up?
Did I miss anything?


-Ted

http://www.rx7club.com/3rd-generatio...-packs-864760/


I believe you have to cut down the spark plug also.


Need a trigger and something to drive 4 2 wire coils.


Build a custom mount.


Good Luck

I just tried to draw it up in SolidWorks so I can post a 3d rendering, but of course the program is giving me an error. pictures are worth a thousand words, and even more in this scenario.


What I am trying to do is, make a mount that will be attached to the engine. This mount will hold the coils/igniters directly in front of the spark plugs also acting as a heat sink. The spark plugs will be connected directly to the coils through a boot that I will make, since I do not believe they make this type of boot.

Please note that this is not for a fuel injection motor. These are 2 Blaster SS coils (8207) using HEI igniters, with a 85 distributor (TFIDFIS). Using with no trailing ignition at all.

Did you ask just to tell everyone what you are going to do?:dunno:

Seems like you have it figured out.

Good luck

I posted thinking that maybe somebody would know where to get one of the boots to mount a coil to a plug. I never asked a question on how to do it or if it would work. Only where to get the part.

Here

http://www.google.com/#q=coil+to+plug+boot&tbm=shop

Thank you, but none of those will work. Those are all factory replacement parts. I already started to make my own.

Magnecore may be able to make something work. They have a huge variety of boots. We looked at doing this with the IGN-1A coils and there was not enough room between the plugs and the frame rail.

I have also looked at doing this for my Rx8. I was planning to use the IGN-1A coils as well. I am thinking now that making a 90 degree boot to attach the coils might work if you get creative with mounting angles. I am unsure if there is sufficient room though.

So the direct 90° angled one made for your coils are factory replacement..?????


Good luck...

If you are referring to the MSD part 3331, that is for coil to plug wire. That will not work from coil to spark plug.

Nope.

You got it figured


Edit: I am excited to see what you have come up with. Get on it

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:

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.

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.

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

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!

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

Few shots of everything bolted/welded up so far:



http://i282.photobucket.com/albums/k...psf9f5f876.jpg





http://i282.photobucket.com/albums/k...ps21a0ee6a.jpg

Here you can see the igniters hidden away underneath and a shot of the welds:




http://i282.photobucket.com/albums/k...ps0503e36e.jpg





http://i282.photobucket.com/albums/k...psa16e3eae.jpg





http://i282.photobucket.com/albums/k...ps7cbfa12b.jpg

And here they are for a test fit in my very dirty engine bay, that will change very soon:





http://i282.photobucket.com/albums/k...ps654a3f4a.jpg





http://i282.photobucket.com/albums/k...ps57e61d2c.jpg






http://i282.photobucket.com/albums/k...ps39e17ef8.jpg