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Tech Talk => Engine Mechanical / Electrical => Topic started by: jrankin on March 02, 2017, 11:08:00 PM
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Hey BBC guys. Got few questions. I'm getting a pop at about 3000 rpm. I have timing set to 14 int, 34 adv. 468 roller, stainless valves, springs, forged flat top pistons, crank, Rods. What plug should I be running. Motor is just broke in. Wondering if timing needs to be advanced more, or if I need hotter plug. Believe the plugs are 26. I'm running Plonix billet marine, and MSD blaster 2 coil, 750 Dave Lang built holly. Thanks in advance.
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3000 rpm under load, or out of the water? Once it pulls past 3000 rpm the popping stops?
What power valve?
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Exhaust pop or intake?
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Exhaust.
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Off throttle
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If it pops when you let off the throttle check your advance springs inside the distributor. Mine broke and that was the result. No spring and the advance mechanism was jumping back & forth.
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All good there.
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All good there.
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Potentially a vacuum leak? Could be a sucked gasket.
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Thought that too, replaced new intake and gaskets, thinking intake may have a crack. Only thing I can think of is vacuum off the carb to air filter. I should cap it instead of running it. That's pretty much last thing I can think of, besides maybe carb to small for motor now, or power valve to small. It's got me lost. Lol
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Thought that too, replaced new intake and gaskets, thinking intake may have a crack. Only thing I can think of is vacuum off the carb to air filter. I should cap it instead of running it. That's pretty much last thing I can think of, besides maybe carb to small for motor now, or power valve to small. It's got me lost. Lol
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Not feeling it. As far as the air filter thing.
What are you running for a distributor?
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This one, believe you told me this one or the MSD one while back.
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This one, believe you told me this one or the MSD one while back.
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That's a great distributor.
What is this vacuum line to the air filter you speak of?
I can't get my had wrapped around it.
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Carb to air filter.
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Carb to air filter.
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This sounds like your issue.
Like from the larger port" the base of the carburetor to the flame arrestor?
That's a negative Ghost Rider....
GT
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Yes!
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The pattern is full! Great movie! I'll give it a try, thanks GT!
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Plug the port on the carb base....
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It's an ignition issue, ditch the Petronix unit, I had the same problem on my bbc engine. I installed the MSD marine box with their pro billet distributor and the problem was gone instantly.
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It's an ignition issue, ditch the Petronix unit, I had the same problem on my bbc engine. I installed the MSD marine box with their pro billet distributor and the problem was gone instantly.
damn i was waiting for that. Can't agree no more👍👍
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That dizzy not as good as people think. Just my .02
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That dizzy not as good as people think. Just my .02
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Had one on the whitewater boat, ran one on the pull truck, put one on a buddies motor home used to sell the he'll out of them.
Unless something dramatic has changed, it's a pretty good piece.
GT
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Not going to get deep into this. Just giving the guy a couple more things to check if what you said don't work. Some people have no problems with them but I did not once but twice on two different engines. It's is what it is some people like them some don't.
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Not going to get deep into this. Just giving the guy a couple more things to check if what you said don't work. Some people have no problems with them but I did not once but twice on two different engines. It's is what it is some people like them some don't.
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The biggest issue with the hall effect distributors is when the voltage is low it you try to use a high resistance or internally resisted coil.
GT
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Thanks big block. I'll see if buddy has one laying around to try before spending more. Appreciate they input
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The biggest issue with the hall effect distributors is when the voltage is low it you try to use a high resistance or internally resisted coil.
GT
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Yes sir ... Got to have correct voltage.
Ran one for 10 years never a single issue.
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So my alternator is bad, I do have Batt charger on it. So could be I'm not enough voltage, got a new alternator on the way. I'll try that first, before spending 1000 bucks. Thanks again guys I'll let ya know.
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So my alternator is bad, I do have Batt charger on it. So could be I'm not enough voltage, got a new alternator on the way. I'll try that first, before spending 1000 bucks. Thanks again guys I'll let ya know.
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The electronic ignition systems are designed around 14.5 volts.... So absolutely.
GT
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Yes check voltage, it's was at 9.6. So I already order a alternator it will be here Thursday.
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