Anyone have results of the relation between spark plug gap and ability to maintain torque into the midrange rpm band.

I was thinking that provided your ignition system is up to task, a larger gap would give you better ability to ensure a good burn at midrange rpm since there is more spark essentially.

Any downsides to running larger gap?

Stock 35 to say 45?

 

You might gain 0.002% more HP by opening up the gap, as long as it can still fire reliably.

 

With the HEI's the minimum gap I'd have is .045, I got a little better than stock and run mine at .060 w/ no problem. HEI's got zing and can handle the wider gap w/ no problem.

 

It's not HP that I'm after, its keep the torque curve as flat as possible till I hit other restrictions that prevent this from being possible.

 

I doubt you'd notice any difference.

 

I'm wondering if I should go through the trouble of it because there are quite a few people now I've talked to that have re gapped theirs to say 45 or 55 and have said that their midrange improved somewhat.

I wouldn't have thought much about it till I saw a dyno result of a 45 gap tpi vs a 35 gap tpi and the curve was more noticibly flatter. The slope of the drop off after peak torque was significantly less. The ignition system was a jacob's 65000 V so I wasn't really sure though how much that comes into play or not...

 

i doubt youll genuinly gain much if its already properly gapped. The differences would probably be too small to conclusivly see with a stock, or near stock setup.