gingerprince
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| posted on 8/6/06 at 08:25 AM |
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Bike cans with Cat's built in
In a bid to quieten my Indy down (on the cheap until I get a full system made up in the winter) to get on some trackdays I've got hold of a
standard bike can off eBay - It's a GSXR1000 K3/K4 titanium can for the princely sum of £7.50 
Anyhow I have a spare set of carbs with standard 115 main jets on my blade so was hoping to swap can and carbs and be reasonably setup.
However the exhaust looks like it has a cat (it's got that telltail pattern when you look in the input side).
So a couple of questions: -
1. Will the CAT hinder performance much over say a standard baffled non-cat can? I'm thinking here more along the lines of will using the
standard 115 main jet for the blade run rich because the cat is even more restrictive than a standard blade can?
2. What will happen to the CAT over time with a carbed engine? (I know they die due to unburned fuel but do they clog up, break up or just stop
"catalysing" ?
3. I know the cat is useless for any MOT purposes anyway as bike cat's aren't man enough for car tests (if it's ever required for
MOT) so can I break it out, and if so will that cause me any noise issues (ie does the CAT form part of the noise suppression)?
I'm willing and expecting to accept some loss of power for now to get on track (and play corners  ), but hoping to be able to run whatever
system with my 115 main jets just to get me on track.
So any suggestions for the best approach?
Cheers, Sy
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sebastiaan
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| posted on 8/6/06 at 05:10 PM |
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1. the cat might hinder performance a little, but if this is over 5bhp, i'd be *really* surprised. These things flow quite efficiently.
2. cat's don't die of unburnt fuel, they do of unburnt fuel AND oxygen. This mixture then burns inside the cat, heating it up to a point
where (usually) the carrier (the bit that has the honeycomb structure in it on which the precious metals are located) either breaks up or melts. This
might clog the cat, but it usually doesn't.
3. Leave it in and give it a go. If it isn't quiet enough, get another can ;-)
I'd just put the can on and see how the engine runs and if it is quiet enough. Go enjoy yourself!
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gingerprince
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| posted on 8/6/06 at 10:45 PM |
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Cheers. That's what I'm hoping for, and at the end of the day if it is really poor it's only cost me a few quid!
Just crossing my fingers that the jets in the spare carbs will suit it and so be the cheap stop-gap for the summer I'm hoping for.
Ideally I'd have played on Saturday, but some buggers decided it'd be a good idea to have a barbecue and put the world cup on his plasma
telly so it looks like I'll have to wait until next week to test it
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gingerprince
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| posted on 11/6/06 at 07:36 PM |
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Well I guess the new can isn't too restrictive then. It ran like a dogs dinner with the spare carbs (with 115 jets). Put the original carbs
back on (with the 132 jets) and it ran much better. Still a little hesitation, but I guess the fact that I'm not running an airbox makes a big
difference to breathing so it likes more fuel.
Tell you what though, with a quiet exhaust on you realise just how bl00dy loud the induction is 
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