LS7 Ignition leads coming off

[adam001]

Hi,

Having a little bit of trouble with our LS7 in our Ultima GTR. The standard ignition HT leads do not seem to stay on while on track. Mostly the boots on the spark plugs are coming off, but occasionally on the coils aswell.

Has anyone else had this issue? Found better leads? I wanted to avoid sliding the metal boots off and using the old rally trick of cable ties if I can

Cheers,
Adam

[ROWDYRENAULT]

Adam: My engine builder builds LS motors for off road trucks that compete in the Baja and new Paris to Dakar races. He also drives and sometimes crews them so I think he's got the vibration and heat thing pretty well wired. I called him and he says your problem is heat on the boots he suggested 8.5mm MSD wires with the silver cloth heat insulation over them. Hope that helps, lee

[adam001]

Thank you for that, do you have any recommendation on where you can get pre-made leads for the LS7?

[Hugger Z]

adam001 said:

Thank you for that, do you have any recommendation on where you can get pre-made leads for the LS7?

LS7 was a corvette motor. Are your coils in the stock location? If so then you can just buy the MSD 8.5mm wires for a Z06 (which has the LS7). If they are not, look for a kit that allows custom lengths. I have the MSD wires on my LS1 engine and they work great. Never had any issues and daily drive the car in the warmer months here.

[adam001]

Hi, yes the coils are in the stock position. I can see magnecor and MSD HT leads for the ZO6, does anyone know of a good UK supplier?

[Storer]

Talk to Kyle when he gets back from his holidays. He will have a supplier.

Paul

[MarkWebb]

There is a europe msd seller. However they are based in Greece and if they do not have stock the stuff takes ages to arrive.

[philcerb]

phone magnecor 01530 274975 they post out for next day ask for 13mm longer.

[ROWDYRENAULT]

Adam don't forget to use a heat shield on the plug wire and boots. Thermo Tec company builds a slip over heat shield for this problem. Lee

[teamHOLDENracing]

adam001 said:

Hi, yes the coils are in the stock position. I can see magnecor and MSD HT leads for the ZO6, does anyone know of a good UK supplier?

Adam - I have a set of new Moroso race leads for the LS engine - bought them a while ago but never fitted them. I have now relocated my coil packs so can't use them. They are Moroso Ultra 40 race wires: http://www.moroso.com/catalog/categorydisplay.asp?...

Happy to sell them to you at a bit of a discount. PM me if of any interest - they were about $115 from memory, plus tax and shipping from the USA. I've also got some heat resistant boot covers I'll throw in with them.

Cheers

Andy

[adam001]

Thanks for all the replies.

Andy are those Moroso Leads the 7mm or 8.5mm? Going by the above posts I get the impression we need 8.5mm

Phil, I'll get on the phone to magnecor and see what they offer, what did you mean by 13mm longer? Are their normal leads for the Z06 too short?

Will talk to Kyle aswell

Had a look at the thermotec website, looks like a good thing to be doing, will have a look on demon tweeks aswell

[philcerb]

standard zo6 leads need to be 13mm longer to fit nice.

[teamHOLDENracing]

Adam, just had a look and they are actually 8.65 mm. I bought them for racing, so got what I perceived to be the best.

They are approx 9 inches long tip to tip.

Not sure where you are - can always send you one to test fit.

I suspect what is happening to you is air is trapped by the seal of the boot on the plug or coil. When it gets v hot it pressurised and pops off. One way of aleviating this is to put a pin hole in the boot

Cheers

Andy

[adam001]

Thank you Andy, I sent you a email about the leads Yesterday, they sound like they fit the bill

[teamHOLDENracing]

Probably stuck in my spam filter - can only exract it on Monday morning...