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Discussion Starter #1
We went out yesterday and got the first kit right.At the end of the day we tried the secound kit.As soon as it came on it started popping.We run 34* initial,pull 13* on the first kit and another 11* for the secound.Could this be a phasing problem?We tried to phase it best we could but we are thinking maybe 30* initial to help get the phasing better.Does this make sense?
 

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Discussion Starter #4
If it is a phasing problem should I see any marks when I pull the distributer cap off? It's clean under the cap.
 

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Discussion Starter #6
615" bbc,13:1 comp,14* rfd heads with softened chambers,tunnelram with 2 sv1's,vp no2 fuel,0.080 gasket with piston 0.007 in the hole,cam is 0.900I/0.851E,282/304 @ 0.050,115 sep,113 centerline.2 NOS foggers with annular nozzles.1st kit 32n/22f at 5 pds with 21*.2nd kit 26n/18f at 4 3/4 pds and 11* pulled for a total of 10*.IS flow tool,ngk 10 plugs gapped at 0.025.Thanks
 

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615" bbc,13:1 comp,14* rfd heads with softened chambers,tunnelram with 2 sv1's,vp no2 fuel,0.080 gasket with piston 0.007 in the hole,cam is 0.900I/0.851E,282/304 @ 0.050,115 sep,113 centerline.2 NOS foggers with annular nozzles.1st kit 32n/22f at 5 pds with 21*.2nd kit 26n/18f at 4 3/4 pds and 11* pulled for a total of 10*.IS flow tool,ngk 10 plugs gapped at 0.025.Thanks

How is rotor phased now?
How is nitrous activated?
Have you visually watched timing pull down and hold where it should, when nitrous is activated?
Does it do it on motor passes?
Does it do it on one kit or both?
What does data logger say?
What do plugs look like?
Have you checked trigger wires from crank trigger to ignition (corrosion, spliced, cut, ran too close to other electrical wiring) etc.
 

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615" bbc,13:1 comp,14* rfd heads with softened chambers,tunnelram with 2 sv1's,vp no2 fuel,0.080 gasket with piston 0.007 in the hole,cam is 0.900I/0.851E,282/304 @ 0.050,115 sep,113 centerline.2 NOS foggers with annular nozzles.1st kit 32n/22f at 5 pds with 21*.2nd kit 26n/18f at 4 3/4 pds and 11* pulled for a total of 10*.IS flow tool,ngk 10 plugs gapped at 0.025.Thanks
To me looks like to much timing out ??? Based on the laws of average, if it's taking a .032 jet with 21 degrees still in it, I wouldn't see the need to pull 11 more for a .026 jet ?? You did all the right things to make the engine less timing sensitive, take advantage of it.. You do still need to properly phase dizzy though too.. SJ
 

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Discussion Starter #10
Coil has about 150 passes on it.I'm going to pull 4* out of the initial then rephase the distributor.I will try it again and maybe add a little timing.Only problem is now I have to wait for spring.Thanks
 

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Make sure there are no restrictions keeping nitrous from getting there...all plungers good and operating, nitrous filters (if any) are clean, etc. Did you try turning on the second fogger by itself to make sure the system is working properly?
 

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Crank trigger with that much juice. To much deflection going on. Accurate timing readings from the crank is more suitible. Oh yeah most retard ignitions only pull up to 20 degrees retard total. Your pulling 24, that may be your issue!
 

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615" bbc,13:1 comp,14* rfd heads with softened chambers,... cam is 0.900I/0.851E,282/304 @ 0.050,115 sep,113 centerline. 32n/22f at 5 pds with 21*.2nd kit 26n/18f at 4 3/4 pds
I'm a little out of my league on this combo, and assuming the carbs are right, the timing is probably low, but that looks like the way wrong cam to me. I'm running alot more exhaust and an earlier opening on my 565 with a similar amount of spray. I argued with Bullet and Comp on this before I put my own stick in there. I also have some knowledge of a 582 with way less spray and a similar cam that was suffering from reversion...

Maybe your exhaust port flows more than normal, otherwie I would questions that exhuast lobe?
 

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when you say a phase problem - what timing are you phasing the rotor to?

motor timimg?
1st stage timing?
2nd stage timing?
Somewhere in the middle?

you say lowering initial timing from 34 to 30, if you phase the dist to be close to correct at full timing retard the initial shouldn't matter going down the track on 2 kits.........

maybe I am missing something, or assuming incorrectly you have a crank trigger
 

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No mention of crank trigger, or just a dist. If you are trying to pull that much out of a dist, ain't going to happen, the rotor gets way out of phase on the second retard. If it is a crank trigger, be sure you phase the rotor back far enough.......somewhere around 15* should be fine and try it. Timing might be a touch low, but that combo should run easily at 10* on that amount of nitrous

Monte
 

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No mention of crank trigger, or just a dist. If you are trying to pull that much out of a dist, ain't going to happen, the rotor gets way out of phase on the second retard.
What is a good rule of thumb for pulling the maximum timing with a distributor? 15 degrees? Say from 25 to 10?
 

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It does have a crank trigger we phased it at 20 degree's ran out of adjustment on the belt drive distributor need to turn it back a tooth.
 

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The nitrous guy
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What is a good rule of thumb for pulling the maximum timing with a distributor? 15 degrees? Say from 25 to 10?
Depends............you have much more room between posts with a Ford cap, than with the small cap, so again, depends on distibutor. As with most things though, there is not a "hard" number that you should not go beyond.

To the OP.........I suspect phase is your problem

Monte
 
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