12 replies to this topic

[AlexP]

My exhaust is making an awful racket considering its a twin box, and really sounds like it is blowing but I cannot see where from. It is an RC40 system with janspeed LCB. I cannot see any fumes escaping from any joints, but the noise is coming from LCB to down pipe joint area.

Is there a good DIY test i can perform to see if any gas is escaping?

[ashmiddleton]

i have always stuck my foot over the end of th exhaust with the engine running then get a mate to get underneath and listen hope this helps

[The-Womble]

I'd wait for a second opinion on this, but I seem to remember reading that if you stuck a cloth or something over the end of the exhaust (only for a few seconds, obviously), it'll increase the pressure of any gas escaping through the hole and you might be able to see it.

Edit: too late. Same suggestion though

Edited by The-Womble, 11 June 2010 - 01:11 PM.

[AndrewJ530]

Could always put some soapy water on the joints near the link pipe and look for bubbles.

[mini_mad69]

Could always put some soapy water on the joints near the link pipe and look for bubbles.

That might work, but make sure the exhaust is stone cold, and as soon as it's started you look. As the exhaust and especialy manifold heat up in a few seconds.

[DaveVader]

Could always put some soapy water on the joints near the link pipe and look for bubbles.

That might work, but make sure the exhaust is stone cold, and as soon as it's started you look. As the exhaust and especialy manifold heat up in a few seconds.

Yeah tell me about it
Pull off my drive "ahh crap, my exhaust just fell off, don't worry, I will just slot it back on" BURN!
Bugger.

You've reminded me that I need to fix my blowing exhaust.

[shnevpayne]

Could always put some soapy water on the joints near the link pipe and look for bubbles.

That might work, but make sure the exhaust is stone cold, and as soon as it's started you look. As the exhaust and especialy manifold heat up in a few seconds.

Yeah tell me about it
Pull off my drive "ahh crap, my exhaust just fell off, don't worry, I will just slot it back on" BURN!
Bugger.

I did that, in the middle of bristol in a multi story car park, tho I went over a speed bump and the exhaust stayed put and started melting into the rubber bump! Was a bit unnecessary tho, massive speed bump! Was very noisy all the way home (75 miles of it!!!)

[mattwho?]

well ive had a few cars with leeking pipes like the bmw zorst i had to do today lol
my old cooper had a leek and all i had to do was look for black soot on the joins to see where it was leeking

[AlexP]

What is the best way to patch a leak joint? The LCB Y-Piece to middle box pipe has 2 'U' bolts holding it together as well as what looks like firegum or assy paste but still looks 'leaky' (although I couldn't feel a leak with my hand).

[MiniAlex]

I alwyas get an old blanket or something, and put it over the ehxaust. Then get someone else to get under the car and try and listen to where it is leaking from I had to do this when I thought the cat was leaking on mine. Sounded noisy round that area haha

[DaveVader]

Spent the whole day sorting my exhaust, took the whole system off, bought new brackets, some exhaust putty and set at it.
Got it on after a lot of jiggery-pokery, yes! No more blowing.
Lets go for a spin... trundle trundle trundle. Hmm, sounds good, back pressure, feels good.
Oh shi... that was my exhaust, oh so was that.
The bracket the holds the exhaust on (well, both of them) broke as I was going along which meant I had to drive home, very slowly and loudly, with an exhaust system sticking out my car.
Great.
Need to grab a mounting kit and will fit it tomorrow, SO annoyed though, my luck has been going out the window recently.

[E-Tizzle]

ive seen on wheeler dealers (and possibly another program) where they just hold up some very thin and light paper, something like tissue paper up to any joint, if it starts flapping around then you know theres a leak, this is best done inside for obvious reasons.

im pretty sure mine has got a blow as well, but it cant see the soot because the whole thing is covered in oil.

[JoneseyBoy]

just put your hand over the end of the exhaust to block the air coming out so it forces it threw any holes in the exhaust if there is any