ht lead voltage?

Post Fri Oct 18, 2019 3:44 pm

Was checking for a misfire on an m20 today and found an ht lead with broken insulation and the top of the spark plug end .The reason i found it was because it gave me a shock, not once but twice

How much voltage goes through the ht lead as it wasn't pleasent to say the least haha.

Post Fri Oct 18, 2019 4:19 pm

One hell of a lot mate

20,000 v ??
Twice ?????

Mart.

Post Fri Oct 18, 2019 4:36 pm

Can be very nasty... there's a suppressor resistor in the cable just before the spark plug connector which burn out and damage the cable... I had a misfire at 3k to 4k revs which was random caused by such a failure.

Paul

Post Fri Oct 18, 2019 4:44 pm

martauto wrote: ↑
Fri Oct 18, 2019 4:19 pm
One hell of a lot mate
20,000 v ??
Twice ?????

Mart.

Yeah twice

Haha.Second one i had hold of it with long nose pliers and i still got me somehow

Post Fri Oct 18, 2019 7:24 pm

If the lead is connected to a spark plug the voltage will be limited to a maximum of about 2000 volts, but if it's disconnected, it'll be 20,000 volts +, probably even 30,000.
Either will hurt.
30,000 volts will jump about 10mm in air, if from a rounded surface, or about 20mm from a sharp point.

Post Mon Oct 21, 2019 8:06 pm

Brianmoooore wrote: ↑
Fri Oct 18, 2019 7:24 pm
If the lead is connected to a spark plug the voltage will be limited to a maximum of about 2000 volts, but if it's disconnected, it'll be 20,000 volts +, probably even 30,000.
Either will hurt.
30,000 volts will jump about 10mm in air, if from a rounded surface, or about 20mm from a sharp point.

Must of jumped from the pliers onto my hand the second time then Brian .Ht lead has been replaced now .