Right side exhaust pipe at rear of car smooth stable and unmoved
Left side wobbles all over the place
All hangers checked and all good.
I also have a "whistle" coming from the left hand side exhaust, it increases as RPM increases
I'm thinking a leak / gap in header collector to exhaust flange gasket or I haven't sealed the pipes well enough up to the heads...
any other thoughts ?
Newly fired BBC...exhaust shaking on left bank only
Moderator: Team
-
- Guru
- Posts: 1762
- Joined: Wed Aug 26, 2009 8:30 pm
- Location: Beautiful Southern Maryland
- Contact:
Re: Newly fired BBC...exhaust shaking on left bank only
Both sides are connected to the same engine. If one side is solid and the other side moves around it sound to me like the left side is not supported correctly somewhere. You need somebody to grab hold of the left pipe and shake it around while you look to see where it is loose.
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
www.enginerepairshop.com
Advanced Automotive Machine
Waldorf Md
www.enginerepairshop.com
-
- Pro
- Posts: 231
- Joined: Tue Apr 21, 2015 8:49 pm
- Location: Quinton/Richmond VA
Re: Newly fired BBC...exhaust shaking on left bank only
Solid mounts - they are all good. It does have a slight misfire every 20 secs or so that I am trying to track down. Yeah I agree same engine how can it be engine related, esp when the engine (at idle) is basically unmoved. more to look into...I need to get under it
Re: Newly fired BBC...exhaust shaking on left bank only
It doesn't by chance have a 4-7 swap cam?
1.34 9.42 @ 142.41 / 1.28 5.96 @ 115.00 @ #3251 Better in 2023
427 BBC by S&S Speed Center, AFD, Enderle MFI by Spud Miller
Sepanek Racing T400, Dynamic converter, Autoweld, Santhuff, Smith Racecraft,
Dick Fords Body Shop, Trackside Products,
427 BBC by S&S Speed Center, AFD, Enderle MFI by Spud Miller
Sepanek Racing T400, Dynamic converter, Autoweld, Santhuff, Smith Racecraft,
Dick Fords Body Shop, Trackside Products,
-
- Guru
- Posts: 4607
- Joined: Sun Sep 18, 2011 11:31 am
- Location: Heading for a bang up with Andromeda as we all are.
Re: Newly fired BBC...exhaust shaking on left bank only
If you crank it with the spark killed is the cranking rpm steady, or does it speed up going by a particular cylinder?
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
Re: Newly fired BBC...exhaust shaking on left bank only
I'd throw a $1 bet the ex valve to guide clearance is too tight.
Heat is energy, energy is horsepower...but you gotta control the heat.
-Carl
-Carl
Re: Newly fired BBC...exhaust shaking on left bank only
OK so exhaust fixed. It was a hanger. looked OK on basic inspection I went all over them with the car running and one was cracked (metal part) and when still it reseated and looked OK.
Now to figure out the whistle. Definitely sounds inside the engine. I might pull the carb and freshen it up and ensure there are no vac leaks. Might be a pin hole leak in a casket or something like that
Now to figure out the whistle. Definitely sounds inside the engine. I might pull the carb and freshen it up and ensure there are no vac leaks. Might be a pin hole leak in a casket or something like that