Discussion
Heres a daft question...if i took the Y section of exhaust out, gave it a bit of a thump (
) and then got an airline and blew air through from the opposite direction, does anyone think that this will make a difference or just be a waste of time...???
Also while it is like this, would i be able to remove the pre cats without taking the manifolds off?
) and then got an airline and blew air through from the opposite direction, does anyone think that this will make a difference or just be a waste of time...??? Also while it is like this, would i be able to remove the pre cats without taking the manifolds off?
Andy
I've read reports about the possibility of per-cat debris falling back into the exhaust ports whilst you knock them out, so id be a little cautious. Couldn't say if the cr*p would simply be blown back into the manifold when you fired it up, or be sucked inwards to cause internal damage.
If you've got the 'Y' off, it's only another 10 hours work, lots of swearing, gashed skin, oh and the cost of new gaskets to get the manifolds off......
I've read reports about the possibility of per-cat debris falling back into the exhaust ports whilst you knock them out, so id be a little cautious. Couldn't say if the cr*p would simply be blown back into the manifold when you fired it up, or be sucked inwards to cause internal damage.
If you've got the 'Y' off, it's only another 10 hours work, lots of swearing, gashed skin, oh and the cost of new gaskets to get the manifolds off......
Had this when I had a Chim. The precats had disintegrated and blocked the main cat. I chopped out the main cat and replaced it with a Blackthorne Autocatylist, Sports, free flow cat, (200 cell) cost about 170 squid. Total job took about 5 hours (on my drive) including removing the Y piece, chopping the main cat section out and TIG welding the new one in. Didn't bother putting the precats back in. Well worth it in terms of a few extra horses and the noise. Whilst the Y piece was out, I stuck a vacuum cleaner hose into the manifolds to suck out any crap that may have been left in there.
If you are not a welder then I would have thought that any reasonable fabrication / sheet metal shop would do the job for you for not much money as long as you removed the Y piece.
Dave C
If you are not a welder then I would have thought that any reasonable fabrication / sheet metal shop would do the job for you for not much money as long as you removed the Y piece.
Dave C
A little advice for the lower bolts on both sides of the engine.
Drivers side, remove the starter if you can, it makes access a little easier.
Passenger side, remove the main exhaust...six bolts to the tray and the rear hanger, makes things a lot easier if you can get to the bolts from underneath.
Regards
Iain
Drivers side, remove the starter if you can, it makes access a little easier.
Passenger side, remove the main exhaust...six bolts to the tray and the rear hanger, makes things a lot easier if you can get to the bolts from underneath.
Regards
Iain
ntel said:
Had this when I had a Chim. The precats had disintegrated and blocked the main cat. I chopped out the main cat and replaced it with a Blackthorne Autocatylist, Sports, free flow cat, (200 cell) cost about 170 squid. Total job took about 5 hours (on my drive) including removing the Y piece, chopping the main cat section out and TIG welding the new one in. Didn't bother putting the precats back in. Well worth it in terms of a few extra horses and the noise. Whilst the Y piece was out, I stuck a vacuum cleaner hose into the manifolds to suck out any crap that may have been left in there.
If you are not a welder then I would have thought that any reasonable fabrication / sheet metal shop would do the job for you for not much money as long as you removed the Y piece.
Dave C
Sounds very good.
I used to be a welder by trade so that is not a problem...good (obvious when you think about it) idea about the vaccum cleaner.
Precats out tonight and i shall see how much cr*p comes out the Y section when i tip it upside down!!!
Any other tips/pointers to consider when doing this?
When I first took the Y piece out a few big chunks of pre cat came out but the problem was all the little bits that had blocked the cells. To get me over my initial problem, I cut through the main cat about 2" from the top (hard work with a hacksaw) and knocked out the blocked part of the existing cat. I then welded the can back together. It worked OK for a couple of months but with all the abuse it had had the main cat started to disintegrate. Thats when a put the sports cat in. Dont worry emmissions. When tested mine was always well within the limits. When putting the Y piece back you might struggle aligning it to get the clamps back on. I made a tournequette(sp?) out of rope and a bar. I wrapped the tournequette around the manifold and the cat then wound it up until the flanges seated properly.
Best of Luck.
Dave C
Best of Luck.
Dave C
well i removed the Y section...looked in the left hand manifold and saw the pre-cat, rattling around in there, looked in the right hand manifold...no pre-cat?
Looked inside the y sectiaon and it was sat on top of the main catwedged in a good 'un.
Took me about an hour to get the b
d out!!!
Whole job took 3hrs...which wasnt to bad.
Sounds even better, goes better and it pops and bangs!!!
Looked inside the y sectiaon and it was sat on top of the main catwedged in a good 'un.
Took me about an hour to get the b
d out!!! Whole job took 3hrs...which wasnt to bad.
Sounds even better, goes better and it pops and bangs!!!
Jay Dee said:
Is there any way you can tell if the pre cats or the cats are blocked? Other than glowing manifolds?
Well in my case, the exhaust note was very quiet and acceleration was slugish although the engine ran smoothly. Petrol consumption was low i.e 26 to 28mpg although that may not have anything to do with it.
Gassing Station | Chimaera | Top of Page | What's New | My Stuff