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EDIS Coil Pack Mounting, and Plug Leads


Damon
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Hi All

Please move this if it is in the wrong section....... but all the interesting stuff seems to go on in this one.

I am in the (painfully slow) process of Megajolting my 3.5 v8 Disco (LPG).

Les has already fitted my trigger wheel, and I have been faffing about sourcing coil packs etc for ages, but now I am ready to get on. I have seen somewhere that someone has fitted the EDIS coil packs to the side of the plenum, and this strikes me as a good solution.

Is there any reason that this is a bad idea?

Would you agree that it is OK to get some ali square bar TIG'ed to the plenum, then tap it for bolts to hold the coil packs? (Not by me obviously, I am inept)

Would anyone have any measurements for the plug leads for this style of fitment?

Anybody have any experience of the 10mm 'quad core' racing plug leads?

(Oh cripes, I've just read the 'rubbish posts' topic)

Your wisdom is eagerly awaited.

Thanks

Damon

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Geoff mounted his coil packs to the side of the plenum on his RR, which then became Zuz's, and is now Bill's, and is now parked in my garden... which means I can wave a camera at the mounts if you like?

Only thing to be wary of would be distorting the plenum casting, it's unlikely but if you got too much heat into it (esp. near the edge) you could warp it and end up with loads of air leaks. I'm sure a TIG-qualified adult could comment on this though.

Don't faff about with swanky pants HT leads, use genuine Bosch or Lucas, or bite the bullet and buy Magnecor. Most of the fancy ones are just brightly coloured tat. My HT leads are a Lucas set picked off the workshop floor, dizzy ends picked off and Ford ends crimped on. Work fine for me even in deeeep water.

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Thanks Fridge'

I had thought of the potential for welding disaster, and have got a plenum off of ebay just in case.

I plan to beg Les to do the welding as I think he is a TIGmeister. I did PM him a while ago on the subject, but I think there was a PM problem at the time as have had no response and they aren't in my sent folder I notice.

A picture of the mounts would be most useful please. I think I've seen a pic of a blue plenum on here with chunks of ali welded on for coil packs.

A measure of the leads would be great too, so I can source them before strapping it all together. So standard 7/8mm silicone leads are adequate?... I thought the bigger the better given that I have LPG?

Damon

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I too thought about mounting them there.

I decided against them as a mechanic mate advised me the coils can breakdown if they get massively overheated.

As such I decided the plenum was not to be the mounting point as it gets horribly hot

This was purely my thoughts from info given to me, it may be that they would be fine long term mounted there, but I thought "why take the chance" and mounted them at the front of the engine and others have done this too since.

The other issue you will have is the ECU, when I megajolted mine the spark was much more powerful, as such the spark meant a "Better" ignition, and the result was hunting as it then ran weak, mine was a tweaked system anyway, but if you find when it runs that it hunts as you drive then you'll need to have the ECU rechipped and programmed.

That was also another of the reasons I went from MegaJolt to full Megasquirt

Nige

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if you are going to the hassle of megajolt then isn't it worth just going the whole hog and going full MS?

its not a huge amount more work after all andwould save you kicking yourself later when you decide to upgrade?

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Hi Guys

I only start on petrol, for literally two seconds until the revs drop and it changes to LPG automatically. The LPG system is an old style 'draw-through' system (though with a stepper valve linked to a lambda to make it closed loop), which I can ramp up the gas flow on.

If this wasn't the case I would MS in a jiffy (or more likely several months of disasters!). I have a Unalite dizzy, which gives good sparks, but the vacuum module has gone kaput, so thought I may as well 'jolt it now that switchable maps is available.

Anybody got any good maps for LPG?? (I hear they like a very different profile)

Nige: I have read your threads with great interest and seen your mounting solution, which I have spoken to Les about fabbing me up, but then I saw the plenum mount and it looks really neat, so thought I would take the chance. If they start breaking down I guess I will have to re-think. They are often mounted on the block in ford applications I think?

Damon

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Nope they are not !!!!!

When I liberated mine from a couiple of M*ndeos :lol: I noticed they are mounted on the END of the block on a strnage shaped bracket like a wedge of cheese, the top being level, and the angled base for triangulation / strength. ie they are in air flow all about :(

That did it for me, and the thought of Looooooooooooooooooooooooooooooooon leads to 1 3 5 and 7 from the other side of the plenum :blink:

Nige

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Ask and ye shall receive - it's as if I've got nothing better to do :ph34r:

plenum_coils_1.jpg

plenum_coils_2.JPG

plenum_coils_3.JPG

And my setup (in the prototype stage :ph34r: ):

wp_coils_1.jpg

OK, not my finest hour of fabrication but this was about 2 weeks to Russia... butchered a pair of Mondeo coil mounts to save faffing about.

wp_coils_2.JPG

Doesn't look too bad covered in mud :P the gunk on it is white grease, with the Ford ends and some grease round the lip they're about as waterproof as can be.

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Nige: Thanks for that. I know nothing and so am prepared to be led. Do you think a mounting like the photos above will get over this heat sink effect? Are the leads that much longer than from the front left side option?

Fridge: Those photos are great, and another option (as opposed to mounting straight to plenum) that might get around the heating fears. Looks not important for me particularly, just thought a plenum mount was neat as no leads need to cross etc.

I have wavered between plenum and water-pump cover mounting (shameless rip-offs both!), and am back in no man's land again now, DOH.

D

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Funnily enough I found my original plans for those coil pack mounts today - could scan them if you like? The finished article was modified a bit from the plans, but I can modify or annotate them to show that.

The coil packs didn't seem to mind being alongside the plenum at all, and it was a nice tidy solution (would have been even tidier if I'd got as far as trimming the HT leads to length and putting in some clamps for them). It does mean quite long HT lead runs to the LH bank, but this isn't really a problem. The leads from the EDIS controller (mounted on the inner wing) run across the bulkhead then neatly up the valley alongside the injector leads and straight up into the bottom of the coil packs.

The one in the photos is made from ally but when I do another I'll use steel (stainless if I could afford it, just 'cause I'm a tart and it doesn't rust), for two reasons. One, I can't weld yet, so the chances of me successfully welding ally are slim (Geoff Greenwood did that one for me). Two, the lugs at the top where it attaches to plenum bolts are thin and too weak in ally. I'll also grind out the areas around these bolts to allow straight lugs instead of the narrow necked ones the original has (if you look at the plenum it wraps round the bolt heads, leaving only a narrow opening).

In order to avoid expansion problems and making fitting a lot easier the bracket has open slots at the bottom where it locates on the three plugs in the side of the plenum base. The plugs are nigh on impossible to tighten with it place so they are fitted with loctite on the thread and backed off just enough to allow the bracket to slide behind the head.

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Nige,

Your leads are the neatest looking, ideally positioned NON factory job I've ever seen, and surely this thread deserves a piccy of your coilpack/lead arrangement, I was certainty well impressed at Bordon.

Boothy

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Please excuse my late response........ I think I stopped getting an email alert when the thread was moved? and have been busy digging my vege patch on the first decent weekend of the year round these parts.

Geoff: Your plans would be very useful if you could dig them out. I haven't welded for 15 years, but I know a man who can. I would really appreciate the HT lead lengths also if you have them.

I have found the image that first sparked my Plenum mount idea:

http://forums.lr4x4.com/index.php?act=atta...ost&id=5502

Would heat transference be an issue with this option do we think?

Damon

post-1722-1208122643_thumb.jpg

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I attached mine to the bulkhead just behind the plenum (LR 90, no airbox). Drilled and tapped holes in the bulkhead and made aluminium brackets for the coilpacks to sit in. I figured less heat soak & vibration. Can take a pic if of interest?

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I attached mine to the bulkhead just behind the plenum (LR 90, no airbox). Drilled and tapped holes in the bulkhead and made aluminium brackets for the coilpacks to sit in. I figured less heat soak & vibration. Can take a pic if of interest?

Hi Tom

Sadly my engine (Disco) is tight to the bulkhead and no room either side on bulkhead due to LPG emulators and other bits and bobs.

I do like the plenum mount,for tidiness, but am also worried about heat damage, but then coil packs are v cheap so I suppose I could carry spares and just suck it and see.

Damon

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Hi Tom

Sadly my engine (Disco) is tight to the bulkhead and no room either side on bulkhead due to LPG emulators and other bits and bobs.

I do like the plenum mount,for tidiness, but am also worried about heat damage, but then coil packs are v cheap so I suppose I could carry spares and just suck it and see.

Damon

Well, Im in a similar situation, on board air and lpg pipes in the way, mine are just mounted on the side, drilled and tapped through (sealed) the plenum. I just used the P38 coil bracket and folded the tabs up.

Never had any issues with heat / breakdown.

(for the more astute amoung you, I dont have a coolant leak, Ive just changed the thermostat).

Heres a pic for you:

post-400-1208184254_thumb.jpg

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That is very neat Paul!

What Standard Ford Leads can you use from that position?

istruggle2gate11: Like that one too, but I am way too scaredy to drill the plenum.

I have now spoken to uncle Les, and 'we' are going with the water pump mount. If it looks as neat as Paul's setup I will be v pleased Les!

Damon

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I used standard Escort leads from the scrappys, got a couple of sets cleaned up with gunk or similar and they're perfect, fantasticly tight fit on the plugs and definatly made for the coil pack with the rubber 'o' ring and snap fit.

Coil packs mount like H'F'Hells side by side over the water pump.

Worked all day on Howlin Wolf round 1 at Bordon, underwater and never missed a single beat all day in the swamp, absolutely amazing.

Best bit did not cost a penny and if needed I've got a spare set.

I find it very hard to justify a set of Magnecor or similar when these work perfectly well.

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Paul - if you swapped the right hand pair from both coil packs (and the LT wires accordingly) your leads would have less crossovers. ;) Do you use the standard long moulded Ford plug ends?

John, leads were only thrown on for photographic effect!

Plug end suits a V8 rather well.

DSCN0879.JPG

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Geoff: Your plans would be very useful if you could dig them out. I haven't welded for 15 years, but I know a man who can. I would really appreciate the HT lead lengths also if you have them.

I have found the image that first sparked my Plenum mount idea:

http://forums.lr4x4.com/index.php?act=atta...ost&id=5502

Would heat transference be an issue with this option do we think?

Should only be marginally worse than my bracket, which hasn't caused any problems. It looks very neat - I'd say like it left the factory that way, but it's a bit too neat to be Solihull's handiwork!

I'll take the plans to work and scan them - might be day after tomorrow as I need to make some phone calls tomorrow lunch time.

Tom - I thought about mounting the coils on the bulkhead, but aside from being a bit short of space (would have been one each side) I was worried about losing the really good earth to the block, especially as I'd had a fair bit of trouble with dodgy earth straps with the original ignition. I take it you don't have any problems?

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