Strange sound when turning right

[Twilling]

My car makes a strange sound when turning right + accelerate. It sounds like the exhaust is getting louder. I only have this problem when turning right.
As if the exhaust leaks in right turns. I have not found the root cause yet. I only have some ideas. Like a worn engine mount or maybe a faulty steering.
Has anyone ever had such a similar issue?

 

[gsxr]

How about if you are in a long right-hand sweeping turn, vs left-hand? Any chance it's rear wheel bearings?

 

[Twilling]

We checked all four wheel bearings but they are still fine. :-(

 

[gsxr]

How did you check the rear wheel bearings? They are nearly impossible to test with the car not moving, without removing the rear axle shaft and feeling the smoothness when rotating the hub by hand.

 

[Twilling]

I think I found the root cause of the strange sound while turning right and accelerate.
There is only a very small gab between the left exhaust pipe and the underlying stiffening. The pipe itselft already has a small dent in that area. I guess I need to replace my engine mounts because if I turn right and accelerate the exhause pipe get contact to the stiffening and the engine sound carries over to the body. I hope new engine mounts will widen up the gab between the exhaust pipe and the stiffening. How much gab do you have in that area between exhaust pipe and underlying stiffening?

 

[gerryvz]

One question for the gurus on this site: When properly installed, what is the general amount of clearance between your crossover pipe, and the cross-member underneath your car?

I recently removed my crossover pipe for my COVID project, specifically to do some under-car detailing and also to make room to get at the flywheel lock, and to do a transmission & torque converter drain.

I re-installed the crossover pipe, and it went on without issue (I've done it a number of times over the years, mainly for transmission services).

I am curious as the amount of clearance that you have between the bottom of your crossover pipe, and the metal "steel bar" reinforcing bar under the car?

My car is about 1/2 to 2/3 of an inch. Also, the bottom seam of my crossover pipe is bent over (has always been that way) to increase clearance.

Interested in your observations / experiences on this clearance distance.

Cheers,
Gerry

 

[gsxr]

1) Measure how much the engine mounts have collapsed, using the photo below as a guide. Only get OE Genuine mounts, if you don't want to be repeating the job. They are expensive.

2) That crossover pipe will move around a bit, if you loosen all 4 bolts slightly (1-2 turns). With the bolts slightly loose, move the pipe so it clears the metal bar, the transmission pan, and engine block with adequate clearance. Then tighten all the bolts evenly. You have to remove this pipe to change the left engine mount, btw.

 

[gerryvz]

I believe my motor mounts are providing enough clearance, so I'm good there.

I'm just curious as to how much "adequate clearance" is typical / common ... ?

 

[sheward]

The clearance in this area of my car before motor mounts were replaced was about 1/16 inch. This distance was with the old crossover pipe which had the heat shield seam peened over. After new motor mounts the new crossover pipe which does not have the seam peened over is about 1/8 to 3/16 away from the chassis tie over bar. There is approximately twice this amount of clearance on my other car which has likely never had any removal and still has original motor mounts. The crossover pipe on this car has the peened over heat shield which I believe came this way from the factory.
I believe any variance between cars can be found in the production of the crossover pipe and heat shield. The heat shield looks to be welded on by hand and this would likely vary a bit due to the way the shield must wrap the curved area of the pipe. In other words this is an assembly process that does not lend itself to extreme accuracy.

drew

 

[sheward]

photos added

 

[Twilling]

photos added

Where can I get such a nice crossover pipe ???

 

[nocfn]

NO shite! I have pipe envy....

 

[Jlaa]

Where can I get such a nice crossover pipe ???

Dang that crossover pipe is lovely.