Club G40 Forum

Technical => Engine and Transmission => Topic started by: rocore on January 21, 2009, 06:48:26 pm

Title: Exhaust... knocking
Post by: rocore on January 21, 2009, 06:48:26 pm

Changed the rear exhaust bungee last week as the old one was nearly worn out and stretched... Now the new one is on the exhaust knocks on the bottom of the car when going over bumpy ground... Seems as though the mid section is flexing? but its not blowing anywhere?!

Not a huge issue but one of those little things that really grind you down!

Title: Re: Exhaust... knocking
Post by: supercharged spaniel on January 21, 2009, 07:38:13 pm

have you still got the little bump stop in between the two back exhaust hangers?

Title: Re: Exhaust... knocking
Post by: rocore on January 21, 2009, 07:54:56 pm

yep, still there. Seems like it is flexing in the middle... just below handbrake area...

Title: Re: Exhaust... knocking
Post by: PeteG40 on January 21, 2009, 09:11:02 pm

has middle rubber gone??

Title: Re: Exhaust... knocking
Post by: scotsjohn on January 21, 2009, 09:40:00 pm

What diameter are you running? Clearances get pretty critical at the 60mm mark.

Title: Re: Exhaust... knocking
Post by: rocore on January 22, 2009, 08:35:38 am

Running standard system at the moment. Think i need to get the car up and have a proper gander underneath.

Title: Re: Exhaust... knocking
Post by: G40supercharged on January 22, 2009, 08:44:23 am

Check the joint between the catalyst section and the middle section. This sits just above the transmission tunnel brace. The exhaust clamp at the joint can hit the brace as the engine moves.

Title: Re: Exhaust... knocking
Post by: rocore on January 26, 2009, 08:34:04 am

Believe it or not.... All the problem was, was the U-bolt connector was put on upside down and knocking like hell.

Turned round, problem solved and its like driving a different car!