Nitrous Spark plugs

Originally Posted by mr49south

i run autolite 3922 plugs with timing on 14 works very well

Timing on 14 with the nitrous?! How big of a shot? Unless you're running some high octane fuel, that sounds pretty scary to me...

[mr49south]

i am shooting a 150 shot on 93 pump gas .works very well.

So you're plugs look ok? No detonation I guess? That's amazing for a 150 shot. All we have here in So.Cal. is 91 octane. I've yet to experiment with race fuel & more timing. My 150 shot on 91 octane with my timing on 9 is plenty for me. I don't want to damage any of my motor internals. That's great that you can pull that off though. What are your 1/4 mile times mr49south?

[mr49south]

well we only have an 1/8 trackand i went 7.39 ,97.8mphon a 125 shot leaving on idle with bf drag radials.on the 150 shot leaving at 3200 with 150 shot went a 6.92,at 102.5 .getting ready 2 try a 175next time out.

That's pretty impressive. What all is done to your motor & fuel system mr49south? Have you checked your plugs after a nitrous run, or at least once you get back from the track? How do they look? No flakes of aluminum melted onto the electrodes, right? LOL. Just kidding...I'm curious to see how the 175 shot will work for you. So do you retard your timing at all from regular on motor runs? I highly suggest you retard it at least a few degrees on the 125-175 shots. But...who knows, maybe that 93 octance is helping out bigtime.

[mr49south]

no i never touch my timing. checked my plugs and it was running richmy car runs 7.87 on motor at 87.4mph.my motor is stock bottom end with tw heads ,eldo intake,24lb inj, 75 tb, 73 mass air, 4.10 gear. with a comp cam dont no the specs but it is preety big with 1.72 rollers on it

Originally Posted by mr49south

no i never touch my timing. checked my plugs and it was running richmy car runs 7.87 on motor at 87.4mph.my motor is stock bottom end with tw heads ,eldo intake,24lb inj, 75 tb, 73 mass air, 4.10 gear. with a comp cam dont no the specs but it is preety big with 1.72 rollers on it

Sounds like a good motor combination. What size fuel pump are you running? I've been using nitrous for many years now, and consider myself fairly educated with the 'ol laughing gas. Unless running race gas, any motor should have the timing retarded down to 8-10 degrees btdc when running a 125 shot or higher. I'm just curious...how come you don't retard your timing at all? You might not see any signs of detonation just yet...but you could be doing damage to your motor that shows up down the road.