Popping

« **on:** March 02, 2017, 11:08:00 PM »

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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« **Reply #1 on:** March 02, 2017, 11:59:15 PM »

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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« **Reply #2 on:** March 02, 2017, 11:59:38 PM »

Exhaust pop or intake?

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« **Reply #3 on:** March 03, 2017, 02:40:26 PM »

Exhaust.

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« **Reply #4 on:** March 03, 2017, 02:41:05 PM »

Off throttle

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« **Reply #5 on:** March 03, 2017, 03:02:13 PM »

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.

« **Reply #6 on:** March 04, 2017, 06:27:57 PM »

All good there.

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« **Reply #7 on:** March 04, 2017, 06:29:46 PM »

Quote from: jrankin on March 04, 2017, 06:27:57 PM

All good there.

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Potentially a vacuum leak? Could be a sucked gasket.

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« **Reply #8 on:** March 04, 2017, 07:46:20 PM »

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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« **Reply #9 on:** March 04, 2017, 09:57:12 PM »

Quote from: jrankin on March 04, 2017, 07:46:20 PM

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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« **Reply #10 on:** March 07, 2017, 12:07:50 PM »

This one, believe you told me this one or the MSD one while back.

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« **Reply #11 on:** March 07, 2017, 12:48:14 PM »

Quote from: jrankin on March 07, 2017, 12:07:50 PM

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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« **Reply #12 on:** March 07, 2017, 12:49:57 PM »

Carb to air filter.

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« **Reply #13 on:** March 07, 2017, 12:56:21 PM »

Quote from: jrankin on March 07, 2017, 12:49:57 PM

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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« **Reply #14 on:** March 07, 2017, 10:25:42 PM »

Yes!

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« **Reply #15 on:** March 07, 2017, 10:26:27 PM »

The pattern is full! Great movie! I'll give it a try, thanks GT!

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« **Reply #16 on:** March 08, 2017, 12:08:13 AM »

Plug the port on the carb base....

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« **Reply #17 on:** March 09, 2017, 05:11:36 PM »

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.

« **Reply #18 on:** March 09, 2017, 09:08:00 PM »

Quote from: 86caribbean on March 09, 2017, 05:11:36 PM

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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« **Reply #19 on:** March 09, 2017, 09:08:52 PM »

That dizzy not as good as people think. Just my .02

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« **Reply #20 on:** March 09, 2017, 09:15:48 PM »

Quote from: Bigblockchevy1691 on March 09, 2017, 09:08:52 PM

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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« **Reply #21 on:** March 09, 2017, 09:38:48 PM »

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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« **Reply #22 on:** March 09, 2017, 10:13:29 PM »

Quote from: Bigblockchevy1691 on March 09, 2017, 09:38:48 PM

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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« **Reply #23 on:** March 14, 2017, 09:13:44 AM »

Thanks big block. I'll see if buddy has one laying around to try before spending more. Appreciate they input

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« **Reply #24 on:** March 14, 2017, 09:29:43 AM »

Quote from: GT Jets on March 09, 2017, 10:13:29 PM

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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