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Author: Subject:  Slight Engine Popping
Memberpaslow22
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posted on December 1st, 2018 at 07:32 PM
Slight Engine Popping


Hi,
When I come off the throttle down a hill for example the engine gives out some slight popping noises.
My idea would be carb mixture settings.

I'm running a 1915, and twin 40mm Empi's.

What do others think????
Thanks.
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posted on December 2nd, 2018 at 07:59 AM



An exhaust leak will often cause that



From your ole' mate Jeff
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posted on December 2nd, 2018 at 08:41 AM



Quote:
Originally posted by beetleboyjeff
An exhaust leak will often cause that


Thanks,
I'm pretty sure there are no leaks but I will double check.
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posted on December 2nd, 2018 at 02:12 PM



Inlet leak
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posted on December 2nd, 2018 at 03:57 PM



Quote:
Originally posted by REDKG
Inlet leak

When I changed the manifolds using new gaskets I'm sure I tightened them all up tight, I'll double check.
Hope not, because it's a bugger to get to No.3 nut.

Thanks
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posted on December 2nd, 2018 at 03:58 PM



if its popping it is unburnt fuel in yr exhaust I would be checking the jetting



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posted on December 3rd, 2018 at 05:48 PM



Quote:
Originally posted by vw54
if its popping it is unburnt fuel in yr exhaust I would be checking the jetting


To rich or lean?
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posted on December 4th, 2018 at 07:55 AM



I would say rich

You need to have an analyzer up the exhaust

the EMPI carbies are not very good as well.




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posted on December 4th, 2018 at 12:27 PM



An exhaust system with insufficient back pressure will also cause popping on deceleration, this was fairly common on the extractor systems with the hot dog muffler which would do a couple of pops and then an almighty boom and flame out of the pipe. Very effective at night.
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posted on December 4th, 2018 at 07:19 PM



Quote:
Originally posted by vw54
I would say rich

You need to have an analyzer up the exhaust

the EMPI carbies are not very good as well.



Ok Thanks, The empi's were on the car when purchased.
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posted on December 4th, 2018 at 07:23 PM



Quote:
Originally posted by grumble
An exhaust system with insufficient back pressure will also cause popping on deceleration, this was fairly common on the extractor systems with the hot dog muffler which would do a couple of pops and then an almighty boom and flame out of the pipe. Very effective at night.


Car has a Fatboy muffler, maybe the cause?, I guess I have a few things to check up on. Keep me busy anyway.
Thanks,
Darryl
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posted on December 6th, 2018 at 08:23 AM



Quote:
Originally posted by paslow22
Quote:
Originally posted by grumble
An exhaust system with insufficient back pressure will also cause popping on deceleration, this was fairly common on the extractor systems with the hot dog muffler which would do a couple of pops and then an almighty boom and flame out of the pipe. Very effective at night.


Car has a Fatboy muffler, maybe the cause?, I guess I have a few things to check up on. Keep me busy anyway.
Thanks,
Darryl


Latest, Disconnected all carb linkages and re set carb and air/ mixture and it seems to have solved the popping.

Thanks for all the input.

Darryl


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