Engine backfire
02-19-2004, 07:35 PM
#41
Guest
Posts: n/a
Re: Engine backfire
A bad valve does give an inconstant back pressure sound that
reminds me of an old Crist Craft motor boat.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Just wondering - wouldn't the old test of hanging a shop cloth over
> the end of the tailpipe pretty well identify a possible valve problem?
> Hold it so it hangs straight over the end of the pipe. It will blow
> out, maybe falling back to touch the pipe, unless you have an actual
> exhaust valve problem which will try and suck it up the pipe when that
> cylinder is in the right position. That will cause a backfire, BTW,
> and it can be pretty hard to spot if it's a weak valve spring.
reminds me of an old Crist Craft motor boat.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Just wondering - wouldn't the old test of hanging a shop cloth over
> the end of the tailpipe pretty well identify a possible valve problem?
> Hold it so it hangs straight over the end of the pipe. It will blow
> out, maybe falling back to touch the pipe, unless you have an actual
> exhaust valve problem which will try and suck it up the pipe when that
> cylinder is in the right position. That will cause a backfire, BTW,
> and it can be pretty hard to spot if it's a weak valve spring.
02-19-2004, 07:35 PM
#42
Guest
Posts: n/a
Re: Engine backfire
A bad valve does give an inconstant back pressure sound that
reminds me of an old Crist Craft motor boat.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Just wondering - wouldn't the old test of hanging a shop cloth over
> the end of the tailpipe pretty well identify a possible valve problem?
> Hold it so it hangs straight over the end of the pipe. It will blow
> out, maybe falling back to touch the pipe, unless you have an actual
> exhaust valve problem which will try and suck it up the pipe when that
> cylinder is in the right position. That will cause a backfire, BTW,
> and it can be pretty hard to spot if it's a weak valve spring.
reminds me of an old Crist Craft motor boat.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Just wondering - wouldn't the old test of hanging a shop cloth over
> the end of the tailpipe pretty well identify a possible valve problem?
> Hold it so it hangs straight over the end of the pipe. It will blow
> out, maybe falling back to touch the pipe, unless you have an actual
> exhaust valve problem which will try and suck it up the pipe when that
> cylinder is in the right position. That will cause a backfire, BTW,
> and it can be pretty hard to spot if it's a weak valve spring.
02-19-2004, 07:35 PM
#43
Guest
Posts: n/a
Re: Engine backfire
A bad valve does give an inconstant back pressure sound that
reminds me of an old Crist Craft motor boat.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Just wondering - wouldn't the old test of hanging a shop cloth over
> the end of the tailpipe pretty well identify a possible valve problem?
> Hold it so it hangs straight over the end of the pipe. It will blow
> out, maybe falling back to touch the pipe, unless you have an actual
> exhaust valve problem which will try and suck it up the pipe when that
> cylinder is in the right position. That will cause a backfire, BTW,
> and it can be pretty hard to spot if it's a weak valve spring.
reminds me of an old Crist Craft motor boat.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Just wondering - wouldn't the old test of hanging a shop cloth over
> the end of the tailpipe pretty well identify a possible valve problem?
> Hold it so it hangs straight over the end of the pipe. It will blow
> out, maybe falling back to touch the pipe, unless you have an actual
> exhaust valve problem which will try and suck it up the pipe when that
> cylinder is in the right position. That will cause a backfire, BTW,
> and it can be pretty hard to spot if it's a weak valve spring.
02-19-2004, 07:40 PM
#44
Guest
Posts: n/a
Re: Engine backfire
A crack in the exhaust system will be less likely to be found after
the metals have expanded with heat. You don't need a stethoscope, you
could put your hear directly on the manifolds if you like.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"ezeppelin@msn.com" wrote:
>
> > Make yourself a stethoscope and see if you can find it cold.
>
> Not sure I follow. If by "cold" you mean with the engine not
> running... there wouldn't be any sound anywhere in the system... so
> I'm not sure how I would find the leak with a stethoscope?
the metals have expanded with heat. You don't need a stethoscope, you
could put your hear directly on the manifolds if you like.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"ezeppelin@msn.com" wrote:
>
> > Make yourself a stethoscope and see if you can find it cold.
>
> Not sure I follow. If by "cold" you mean with the engine not
> running... there wouldn't be any sound anywhere in the system... so
> I'm not sure how I would find the leak with a stethoscope?
02-19-2004, 07:40 PM
#45
Guest
Posts: n/a
Re: Engine backfire
A crack in the exhaust system will be less likely to be found after
the metals have expanded with heat. You don't need a stethoscope, you
could put your hear directly on the manifolds if you like.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"ezeppelin@msn.com" wrote:
>
> > Make yourself a stethoscope and see if you can find it cold.
>
> Not sure I follow. If by "cold" you mean with the engine not
> running... there wouldn't be any sound anywhere in the system... so
> I'm not sure how I would find the leak with a stethoscope?
the metals have expanded with heat. You don't need a stethoscope, you
could put your hear directly on the manifolds if you like.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"ezeppelin@msn.com" wrote:
>
> > Make yourself a stethoscope and see if you can find it cold.
>
> Not sure I follow. If by "cold" you mean with the engine not
> running... there wouldn't be any sound anywhere in the system... so
> I'm not sure how I would find the leak with a stethoscope?
02-19-2004, 07:40 PM
#46
Guest
Posts: n/a
Re: Engine backfire
A crack in the exhaust system will be less likely to be found after
the metals have expanded with heat. You don't need a stethoscope, you
could put your hear directly on the manifolds if you like.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"ezeppelin@msn.com" wrote:
>
> > Make yourself a stethoscope and see if you can find it cold.
>
> Not sure I follow. If by "cold" you mean with the engine not
> running... there wouldn't be any sound anywhere in the system... so
> I'm not sure how I would find the leak with a stethoscope?
the metals have expanded with heat. You don't need a stethoscope, you
could put your hear directly on the manifolds if you like.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
"ezeppelin@msn.com" wrote:
>
> > Make yourself a stethoscope and see if you can find it cold.
>
> Not sure I follow. If by "cold" you mean with the engine not
> running... there wouldn't be any sound anywhere in the system... so
> I'm not sure how I would find the leak with a stethoscope?
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