OK I have searched and read until my eyes are buggin out. For those with Crane (or other ignition modules), what plug gap are you using for Autolite 25's?
Regardless of coil or module, you want to run as much gap as the ignition system will reliably support. So experiment with it - start with stock and work your way up. If you have enough energy to jump a bigger gap, that makes for a big, fat spark exposure to the mixture, and as Martha would say, that's a good thing.
your right ,but thats not regardless of the coil.remember the coil puts out the spark,48,000 volt coil dictates a bigger gap as opposed to the stock coil of 37 or 38.and if your running an msd unit then you can increase the gap even a bit more.
You're misunderstanding my post Sting - didn't intend to imply that the coil wouldn't impact how big a gap you could run -- it will impact it. But, REGARDLESS of what your system is, run as a big a gap as your system will reliably supply. If you have more coil, that gap will be larger. The stock system/coil will support the stock gap of .054 unless you're running more compression or boost. The point is - play with it and see. You won't really hurt anything. You'll get some mis-fire when you get the gap too big -- then back it down from there.
Thanks guys! Don't know what the coil output is. It is a Crane PS-91, and all I can tell you is you don't need a dark room to find an arcing wire. Major lightning bolts! You guys ever tried cutting back the ground strap?
Thanks guys! Don't know what the coil output is. It is a Crane PS-91, and all I can tell you is you don't need a dark room to find an arcing wire. Major lightning bolts! You guys ever tried cutting back the ground strap?
I have always read that the stock coil is good for 50,000 volts and the stock gap being between .44-.46.?
I do have my ground straps cut back half way over the electrode. Seems to work ok.
Mild H/C/I combo; stock ignition on mine. I cut back the ground to about half way over the center electrode and run .054". Mileage/drivability/performance have remained unchanged for the last 2 1/2 years and 14K miles - no other changes other than oil/filter.