The V8 Owners Forum -

I have a 4 into 1 exhaust with 4 seperate headers feeding into 1 collector. The headers are just a tap fit into the collector. It is before an O2 sensor.

Anyone know what would be best to seal it?

Thanks,
Tom.

I've heard grease is the best

It seals well and gives you a chance to get it apart in the future

Sealers etc make it a bugger to get apart

Ian

arent they a tight fit as it is ?

Cant see grease doing anything other than melting and running out.

You can get a copper/silicon RTV which works well, or plain old exhaust paste.

But if the tubes are pushed/pulled tight into the collector, any leaks should be minimal.

How is the collector retained onto the tubes ? IMO springs are useless.

have used high tmp silicone on mine but I dont have any sensors to worry about.

Andrew

stevieturbo wrote:arent they a tight fit as it is ?

Cant see grease doing anything other than melting and running out.

You can get a copper/silicon RTV which works well, or plain old exhaust paste.

But if the tubes are pushed/pulled tight into the collector, any leaks should be minimal.

How is the collector retained onto the tubes ? IMO springs are useless.

I used copper grease once. Just once mind

Thanks chaps,

Their is a small rubber (gearbox type) mount at the back of the silencer behind the tail pipe which has very little forward/back movement so that is all that holds the silencer on. The header pipes do go into the collector a fair way so it is held rather securly.



Think i'll try the RTV silicone stuff, had a quick google and it does say it should be ok with sensors.

I suppose its would be more to stop air being drawn in and giving false O2 sensor readings, but yes the are a tight fit.

Tom.

Plain grease works really well, it carbonises really quickly and makes a seal. When I worked in that trade that was all we ever used in the shop.

Alan

the collector should be made in such a way that the ends of the header pipes but against the collector which forms the seal. I take it they arent made like that ?

You might want to consider how you will easily pull it apart if you silicon it up- I'd use copper grease, the worst that can happen is it will run out and you wipe it off.

the collector should be made in such a way that the ends of the header pipes but against the collector which forms the seal. I take it they arent made like that ?

Don't know, an exhaust chap made the exhaust for me. I'll have a look.

Good point about taking it apart, if silicon-ed might be a bugger especially as the headers are not movable until the silencer is of!

Tom.

SuperV8 wrote:

the collector should be made in such a way that the ends of the header pipes but against the collector which forms the seal. I take it they arent made like that ?

Don't know, an exhaust chap made the exhaust for me. I'll have a look.

Good point about taking it apart, if silicon-ed might be a bugger especially as the headers are not movable until the silencer is of!

Tom.

I tried high temperature silicone between manifold and downpipe on my SD1 and it couldn't take the heat. Fine further downstream.