Spark plug gap

[secondchance]

Spak plug gap

For those of you who run AC Delco Rapid fire #5, gapped at .035 (gap for 90 thru 92? FR2LS), ,045 (Recommended on the box of Rapidfire) or .050 (Recommended on the sticker on top of rad shroud on 94 ZR-1)?

 

[Rob]

I have mine gapped at .045 simply because as I recall, a few people had suggested that this was an ideal gap for an LT5. Is it wrong or is it right, I can't really say. I've been running this gap for quite a while and given the duty cycles that my ZR-1 experiences, I have not seen any adverse effects.

Anyone else have thoughts about this?

 

[secondchance]

I'm suprised. Of all people, I'd figured you would know the answer and precisely explain why!
Just kidding.
Wider the gap hotter the plug, right? Does this mean more prone for detonation? Anyone?

 

[KOPBET]

My two pence is that you should use the gap recommended in your owners manual or under-hood sticker unless you raise the compression or add forced induction in which case you would be lowering the gap. Too little gap can cause pre-ignition and detonation. Too much gap could cause misfires, fouling and loss of power and economy.

 

[secondchance]

Well. Problem is that I think .050 settimg recommended for 94 was based on platinum tips that came with the car. I had a lot of problems w/ platinum tips and car runs much better w/ non-plt. Rapidfire.

 

[phrogs]

I have the #5's in my 90 and acording to the service manual it states .035 now I have had a few guys say put it at .050 I say try it out and see what happens.

there are 2 diferent styles of the #5's one is in a blue box the other is in a red box one is pre gaped one says gap to your specs I got the later.....

Im not sure what to say I think mine is running fine right now but I may just pull them gap em to .050 and see what happens.


johnny

 

[secondchance]

I have blue letter #5s, fluted tip. These came pre-gapped at .045. Seems to run fine.