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Possible 7al-2 problem question
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johnracer
DRR Sportsman
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I had a 7al2 do something similar years ago. I also had a worn distributor gear do it. I wasnt running a crank trigger at that time though.

Do you have access to a msd tester?
 
Posts: 51 | Location: Rifle Colorado | Registered: June 06, 2010Reply With QuoteReport This Post
CURTIS REED
DRR Pro
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quote:
Originally posted by johnracer:
I had a 7al2 do something similar years ago. I also had a worn distributor gear do it. I wasnt running a crank trigger at that time though.

Do you have access to a msd tester?


This box was in the car when I purchased it so I really don't know how old it is. If my testing Saturday doesn't show anything fruitful I will probably just put a new one in and have this one repaired for a spare, or to sell.



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Posts: 2944 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
Curly1
DRR Top Comp
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I recommend having a spare. I have had several go bad.........

Techwest has repaired three for me but he is hard to get a hold of. All worked perfect after he did them.


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Goob
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quote:
Originally posted by CURTIS REED:
So I have been chasing a problem on my car and haven't been able to test enough to find it. Points races and Covid stoppage has me behind.

At around 7100-7200 my car will act just like it's on a rev limiter. I have to shift at 6900 and can't run 1/4 mile. Has anyone ever seen an ignition box act like that.

Things I have done:
New crank trigger pick up.
New distributor.
Shimmed springs first then changed springs.
Carb is different but have o2 data anyway.
I use a 3 step and have pulled the high side chip.
Made sure trigger wires are away from anything.

I was going to test Friday but they cancelled. I plan on pulling the three set plug out of the box. Other than that I will change the ignition as a last resort.


Yes!! 7-AL2 was "scattering" sparks, we discovered it trying to time the new engine.


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Posts: 1654 | Location: Indy | Registered: November 21, 2008Reply With QuoteReport This Post
CURTIS REED
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Got to make 1 pass last night with the 3 step pulled completely out and started popping right at 7200 again.

Saw on data recorder that it was showing 29lbs of oil pressure that run so I put it up. I think it’s bad info but have to check it out.



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Posts: 2944 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
MasRacing
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Not sure if you have access to an MSD tester. If you think the rev limiter is activating you could test that without wasting more test runs. If its a rev limiter falsly activating the tester will cut out above that rpm. While it wont let you test for a miss you may be able to prove or eliminate 2 step without going to the track.


B.J. Masiello
 
Posts: 250 | Location: Connecticut | Registered: November 27, 2007Reply With QuoteReport This Post
CURTIS REED
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quote:
Originally posted by MasRacing:
Not sure if you have access to an MSD tester. If you think the rev limiter is activating you could test that without wasting more test runs. If its a rev limiter falsly activating the tester will cut out above that rpm. While it wont let you test for a miss you may be able to prove or eliminate 2 step without going to the track.


Probably a good idea. I will have time to send it to MSD now. Engine is coming out. At the very least I wiped the coatings off and started to get into some bearings.



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Posts: 2944 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post



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