Slight Engine Popping
paslow22 - December 1st, 2018 at 07:32 PM
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.
beetleboyjeff - December 2nd, 2018 at 07:59 AM
An exhaust leak will often cause that
paslow22 - December 2nd, 2018 at 08:41 AM
| Quote: |
Originally
posted by beetleboyjeff
An exhaust leak will often cause that
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Thanks,
I'm pretty sure there are no leaks but I will double check.
REDKG - December 2nd, 2018 at 02:12 PM
Inlet leak
paslow22 - December 2nd, 2018 at 03:57 PM
| Quote: |
Originally
posted by REDKG
Inlet leak
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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
vw54 - December 2nd, 2018 at 03:58 PM
if its popping it is unburnt fuel in yr exhaust I would be checking the jetting
paslow22 - 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
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To rich or lean?
vw54 - 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.
grumble - 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.
paslow22 - 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.
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Ok Thanks, The empi's were on the car when purchased.
paslow22 - 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
paslow22 - 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
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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