Question About Exhausts And Joins

[WYTSKY]

hey guys,

bought a brand new xforce highflow cat off Ryan1600 and put it on the car tonight.

With the new cat on, even with the gaskets, in the middle of the ovals on either side that join to the next part of the exhaust ( the part furthest away from the bolts) I can put my hand under there and feel some of the warm exhaust gases blowing out in the crack.

Just to make it clear... so if the top and bottem of this oval are where the bolts are, the part that I can feel gases is ... ---> () <---

Is this acceptable or does it have to be completly sealed? and if so, wot is the best way?

And I tightened the bolts up hard enough to squish the bit of the gasket around them, but not in the middle.

1 other thing, my old gaskets appeared to be larger then the ones that came with the xforce... should those maybe go back on?

appreciate the help

Adam

[blind_elk]

The flange on the existing pipes has probably warped a bit. You can get special high temperature sealant (like putty) that you can coat the gasket with. That should help create a proper seal at the flange joints.

[Jmaac]

Your flange is bent/warped. Machine it flat or use a much thicker gasket

[WYTSKY]

Thanks guys, appreciate the help.

Can I drive the car around for the day as it is?

is it possible for me to put two gaskets on? ie, the old + new one? or is that a bad idea? because by the looks of the old 1, with that combined with the new 1 it should be a good fit.

[Munkyb0y]

just use that exhaust gasket goo stuff. it's only about $10 a tube. put it on the flanges and use a gasket as you did, and hopefully it will seal. if it doesnt, you'll need to find which face is warped and get it machined flat. well not even really machined.... you could prob do it yourself with a grinder and a steady hand.

Edited February 13, 2008 by Munkyb0y

[r32drifter1]

yeah sounds like a job for a tube of ultra blue gasket sealant!

Edited February 13, 2008 by r32drifter1

[WYTSKY]

I will go out and get a tube of that stuff ( sounds like it could come in handy) but I just chucked on the old and the new gaskets together and it now appears to be fine I may still put some stuff on it just to be safe.

Thanks for the help guys

[Jmaac]

You'd be better off with two gaskets. Goo will take weeks to get it hard enough to be heat resistant. Usually melts or burns out - and its messy

If you machined it flat you shouldnt even need a gasket as the materials are the same and will be running at the same temp

If you pull it off yourself it would cost less than the goo to machine

[(B1) MR_fanny]

i got an exhaust leak at the cat when a speed bump it it. sounded like the car was constantly farting when idling next to a wall. used the goo to fix it all up.

[subzeroR33]

Having a leaking gasket would that have potential to cause a loss in performance.

[Jmaac]

Nope unless the gap creates a fair amount of turbulence - just noiser, more bad gasses...

[moobaque]

The stuff u need to buy is CRC Maniseal Exhaust Cement!

u use this stuff on both sides of exhaust gaskets and as the first time the pipes get some heat in them this stuff will set and stop all those unwanted leaks!

you can purchase it from any auto place eg. repco, bursons, supercheat, etc

[WYTSKY]

Appreciate the help guys.

You know, I gave the car a bit of a flog today, only for a couple of minutes, now I don't know if I have started to become used to the slight lack of power or if the power has gotten back up to what it was somehow.

you know that sensor that plugs into the cat? wot does that do? does it tell the car how much approprate flow it should have? I don't know, it just seemed to have a good strong burble session down this hill, then after that the power didn't seem to be as laggy and it feels abit more torquier from then on.

is this possible?

the other thing I am curious about. these cats flow at 570cfm or some unit of measurement. how much flow does a straight 3" pipe provide?

Adam

[moobaque]

you know that sensor that plugs into the cat? wot does that do?

tis just the exhaust temp sensor.

[WYTSKY]

oh ok, no worries ... just thought it may have something to do with it?