question about the decatting process
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Road Warrior
Joined: Mar 2012
Posts: 1,487
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From: boston
question about the decatting process
I bought myself a second head pipe so that I could decat this one and still have a stock pipe if needed. I cut the window out of the head pipe and removed the cat material. My question is this. Do I have to ensure that I get every bit of the material out? I ground what I could but it still feels like there is still some in there flaking off the pipe. Do I need to worry about getting every last crumb out? if one of the flakes that I leave in there breaks off the pipe, will it harm the bike or just blow out the exhaust? Adding monster ovals also.
I know this this sounds like a dumb question but I am not that that mechanically inclined and don't feel like screwing up my 21000 dollar toy.
Jim
I know this this sounds like a dumb question but I am not that that mechanically inclined and don't feel like screwing up my 21000 dollar toy.
Jim
Ultimate HDF Member
Joined: Aug 2012
Posts: 6,470
Likes: 4
From: on the road
put your hand over the exhaust on a harley sometime------------they have a slight bit of overlap in the cam and you can feel a quick bit of suction but I dont think it could draw it all the way up the pipe before it fired again but I would sure try hard to get it out to keep from getting another rider in the face with super hot junk myself.I dont think you can get it perfect but pretty close
Outstanding HDF Member
Joined: Apr 2010
Posts: 2,477
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From: Western MD
I would try to remove as much as possible. I don't know how far the cats are down the pipe for reversion to cause a problem, but i know cager cars that have the cats close to the head (bolt directly to manifold) can have problems with the piston oil rings getting clogged with debris from cats that break apart. nissan sentras in general had a big issue with this problem.
try putting a bunch of 1/4-5/16 nuts in cat chamber and shake around to knock off as much as the loose stuff as possible.
try putting a bunch of 1/4-5/16 nuts in cat chamber and shake around to knock off as much as the loose stuff as possible.
Tourer
Joined: Jun 2006
Posts: 445
Likes: 33
From: irwin pa.
fragments
I did mine and agree there will be smalls chards attached to the inside of pipe. I doubt they would ever be an issue and may even burn away over time. I wouldn't worry about it and just enjoy the reason you did it in the first place.
Tourer
Joined: May 2010
Posts: 348
Likes: 5
From: The mitten state
Convertor "material" is CERAMIC! It does not burn away, and indeed can be injested (by reversion) back into the engine! NOT "getting it all" can lead to engine failure!
On cars with even underfloor cats, I have lost engines (development) when convertors failed!!!
Reversion is greater with few cylinders! More time between firing pulses in the exhaust. A 6 has more reversion than an 8 and a 4 more than a 6, so you can imagine how much more reversion is present in a 2 cylinder NON_EVEN firing Harley!!
Ceramic makes an excellent abrasive!
On cars with even underfloor cats, I have lost engines (development) when convertors failed!!!
Reversion is greater with few cylinders! More time between firing pulses in the exhaust. A 6 has more reversion than an 8 and a 4 more than a 6, so you can imagine how much more reversion is present in a 2 cylinder NON_EVEN firing Harley!!
Ceramic makes an excellent abrasive!
Intermediate
Joined: Jun 2010
Posts: 45
Likes: 0
From: 3 rd rock
Convertor "material" is CERAMIC! It does not burn away, and indeed can be injested (by reversion) back into the engine! NOT "getting it all" can lead to engine failure!
On cars with even underfloor cats, I have lost engines (development) when convertors failed!!!
Reversion is greater with few cylinders! More time between firing pulses in the exhaust. A 6 has more reversion than an 8 and a 4 more than a 6, so you can imagine how much more reversion is present in a 2 cylinder NON_EVEN firing Harley!!
Ceramic makes an excellent abrasive!
On cars with even underfloor cats, I have lost engines (development) when convertors failed!!!
Reversion is greater with few cylinders! More time between firing pulses in the exhaust. A 6 has more reversion than an 8 and a 4 more than a 6, so you can imagine how much more reversion is present in a 2 cylinder NON_EVEN firing Harley!!
Ceramic makes an excellent abrasive!
Suggesting that there is adequate reversion to draw material into the cylinders is ridiculous and physics/engineering calculation can prove it.
You would have to draw a volume of exhaust greater than the volume of the header pipe back up to the cylinder and into the chamber while at the same time drawing intake air into the other side of the cylinder.
Your information falls along way short of "factually accurate". Maybe check your facts before posting info that confuses people.
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Road Captain
Joined: Mar 2012
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Last edited by IronWright; Oct 3, 2013 at 02:17 AM.
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