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BUSY BOLTERS Are you one?  The Shop Area
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Jul 21st, 2025 | | | | Joined: Dec 2006 Posts: 321 'Bolter | | 'Bolter Joined: Dec 2006 Posts: 321 | Hi Stovebolters....
Been thinking about this since my complete new exhaust system showed up in boxes from Chev of the 40's this past weekend....
In my world...exhaust systems mount on soft mounts not solid mounts...every car I have worked on has rubber motor mounts....so is the exhuast system...then I rebuild Howard Knapp and we have rubber motor mounts and then a solid mounted exhaust system....how is this supposed to work??? every time the motor moves in its rubber mounts where is the stress going to go for exhaust system???....the exhaust is gonna snap in half if I was to really drive this stock 235 cu in motor...
Am I missing something???...you cant mount an exhaust system in a solid manner and then hook it to a rubber mounted motor.....
What am I missing here??
Any insight would be awesome...
MikeC
1951 Chevy 3800 1-TonHoward KnappIn the Stovebolt Gallery1948 Chevy 1-Ton (sold Nov 2017)1953 Chevy 1-Ton (sold 10/1/2016) | | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | Mike, from the exhaust pipe at the exhaust manifold to the muffler there is enough "give" that you do not have to worry. The driver side of the engine is the one to "raise up" a little on acceleration but I have NEVER had the problem you mentioned even with a broken motor mount.....and yes, some exhaust systems have hangers that are attached with a "rubber" pad. Just my .02 | | | | | Joined: Aug 2011 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2011 Posts: 45 | Many 6cyl exhaust systems have a solid mount very close to the manifold. Any mounts at the muffler and tail pipe usually have some sort of rubber insulator. This allows for some movement sideways, and also when the pipe heats up, they have a tendency to "grow" or get longer. Rubber mounts also cut down on the drone in the cab, when using non stock exhaust systems.
Joe
The older I get, I only want to work on older rigs.
| | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | These are the same queations that pop up about the fuel line
which doesn't have a rubber flex line from the frame to the engine.
These engines have quite ridged isolation mounts and move very
little. Metals that aren't taken to their yield point will
flex millions of times till they fatigue. The movement of
the L o n g exhaust pipe and L o n g fuel line to from the
pump back never reaches its yield point.
The proof is in the millions upon millions upon millions of
vehicles that were built that way for many many decades
without failure. Since it's your property now, you of
course have the right to redesign your truck any way
you see fit if you feel that your a better engineer
than the engineering staff that GM employed.
Denny Graham
Sandwich, IL
Denny G
Sandwich, IL
| | | | | Joined: Dec 2006 Posts: 321 'Bolter | | 'Bolter Joined: Dec 2006 Posts: 321 | These are the same queations that pop up about the fuel line
which doesn't have a rubber flex line from the frame to the engine.
These engines have quite ridged isolation mounts and move very
little. Metals that aren't taken to their yield point will
flex millions of times till they fatigue. The movement of
the L o n g exhaust pipe and L o n g fuel line to from the
pump back never reaches its yield point.
The proof is in the millions upon millions upon millions of
vehicles that were built that way for many many decades
without failure. Since it's your property now, you of
course have the right to redesign your truck any way
you see fit if you feel that your a better engineer
than the engineering staff that GM employed.
Denny Graham
Sandwich, IL HI Denny I was thinking the GM engineering boys back in the day must have known what they were doing but even my 1947 CJ2A Willys Jeep that I rebuild everything was rubber mounted...it was funny seeing the pictures on here of the solid mounted tailpipe and muffler too..but as you said it must have worked...look at all the millions of these trucks that were built and driven millions of miles... I am just trying to keep it as stock as possible so when I go to sell it there are less questions to be answered... I learn every day I work on this old rig...but it really makes me appreciate my daily driver more and more... Thanks for all the insight... MikeC
1951 Chevy 3800 1-TonHoward KnappIn the Stovebolt Gallery1948 Chevy 1-Ton (sold Nov 2017)1953 Chevy 1-Ton (sold 10/1/2016) | | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | The longer I have my Stovebolt, the more it makes me appreciate
"IT" as a driver. Especially when I have to trouble shoot my my driver.
dg
Last edited by Denny Graham; 01/04/2016 4:33 PM.
Denny G
Sandwich, IL
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