pre cats

[daz the plumber]

im having my manifolds removed as they still leak from the first atempt.can get rid of the pre cats with out any problems thanks

[sapper]

Relativley easy once the manifolds are off. you will need a long masonary drill bit, hammer and chisel and some long nosed pliers for the last little bits. Or you may be lucky and have then drop out, either way wear a mask some nasties in there.

[daz the plumber]

will i expect a different exhaust note ,any extra power,and will it have to be re tuned?

[That Daddy]

daz the plumber said:

will i expect a different exhaust note ,any extra power,and will it have to be re tuned?

In answer to your questions in order,manifolds will sound more tinny(noticable only on idle)extra power? no not really,no it wont need retuning worth doing yes certainly,one of mine moved before i decided to remove them(was gonna carry out when renewing manifold gaskets)and sheared the tip off one of my Lambda probes

Edited by That Daddy on Wednesday 14th May 22:45

[daz the plumber]

i removed the manifolds today for the second time, i made a mistake by useing exhaust paste on the gaskets and it dried before it was nipped up .the removel of the pre cats was a swine but now its done i am happy

[MuffDaddy]

How tough is the new manifold? I have a ticking noise which I figure is the gasket. What will I need?

[Zippee]

daz the plumber said:

will i expect a different exhaust note ,any extra power,and will it have to be re tuned?

No, no & no in that order!

[daz the plumber]

ive had the manifolds faced up.new gaskets and removed the pre cats ,yet i still have a ticking noise .may be i should just turn the music up a bit and forget it ,as for exhaust note you can tell the difference much deeper and the odd splutter and burble .

[Chimjunkie]

I have just changed my manifolds and taken out the precats. Firstly, in my case, the exhaust is a lot louder, the car does seem more eager (guess that depends on extent of engine tune and whether the exhaust breathing is the next weakest link?) and thirdly the manifolds i replaced them with are shte! Leak worse than my old ones. Back to square one.

[daz the plumber]

did you use the better gaskets?i got mine from tvr shop with new nuts bolts and washers.remember to put them on dry and put the face on a flat surface and remove any pitting .how have you tested to make sure its the manifolds ?

[Chimjunkie]

daz the plumber said:

did you use the better gaskets?i got mine from tvr shop with new nuts bolts and washers.remember to put them on dry and put the face on a flat surface and remove any pitting .how have you tested to make sure its the manifolds ?

Used the metal edged ones with a slow setting exhaust jointing compound. The leaks are coming from the 4 into 1 section. Easily found by using a length of hose as a stethoscope. Got the dremel on the faces to remove pitting and tracking.

[daz the plumber]

mine is now sorted , sounds better, im after perfection and i think its the wrong car for that. the car is not tapping or making any worrying noises when i rev the car but on load there seems to be a clatter untill the revs build up .it could be a number of things but ive heard alot worse daz