Question about Coating Pipes
- Thread starter HILCLMR
- Start date
A
amery3
New member
Ceramic coating makes the pipes stay warmer (probably good in your application) and make them cooler on the outside since it reduces both conduction and radiation because of the properties of the ceramic coating, so it would lower temps some, however it doesn't help a lot though...
If you only wish they were cooler in the spring because your hood gets soft in a few places it will probably help. If you are too hot on a normal riding day, or are melting through your hood, try something else.
You would be better off coating then wrapping them in header wrap or a mesh hood if you're not too attached to your headlight, then slightly shortening the pipe at the header to account for the slower moving sound waves (like 1/8-1/4")
If you only wish they were cooler in the spring because your hood gets soft in a few places it will probably help. If you are too hot on a normal riding day, or are melting through your hood, try something else.
You would be better off coating then wrapping them in header wrap or a mesh hood if you're not too attached to your headlight, then slightly shortening the pipe at the header to account for the slower moving sound waves (like 1/8-1/4")
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HILCLMR
Member
Actually I'm just wondering if operating RPM's will change, I've seen where cpi doesn't recommend coating their black pipes because it affects the pipes operating characteristics. Not really too keen on cutting the pipes any further, they are a tight fit as is. A 1/4 or 1/8 is just not possible.
Last edited:
A
amery3
New member
The RPM that you make peak horsepower at will drop by a decent ammount, just a 30 degree increase in average pipe temp (from 1100 to 1130) will lower Peak HP RPM's by about 30 RPM if you were tuned to operate at 8000 RPM originally. You can find this by looking at the change in mach velocities of the exhaust waves for two temperature cases.
It may or may not matter to you, that's your call, if you think your clutching was dead on, than you will need to re-clutch to load the engine a bit more, or, it may improve it if your clutching was a tad-bit on the heavy side in the primary.
It may or may not matter to you, that's your call, if you think your clutching was dead on, than you will need to re-clutch to load the engine a bit more, or, it may improve it if your clutching was a tad-bit on the heavy side in the primary.
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DWHalverson
Well-known member
Kind of splitting hairs. Sound waves change based on too many variables. Temp, atmospheric pressure, humidity and so on. I've heard the debate on CPI's pipes and I figure it can only help "stabilize" the operating RPM of the pipe. I can't see any loss of power in doing so. Seems like CPI claims you will loose power, I think the power just gets moved and you will have to adjust clutching accordingly. No two engines or pipes are the same anyway.
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RKT
Well-known member
???
I am a little confused by this.. Hotter pipes will raise the peak operating rpms not lower (like stated above)
Having said all that.. if you think pipe coatings are really holding in a bunch of heat.. I got some $$$ that say you can not hold you hand on ANY coated pipe for 10 sec after it as been run... I also got some $$$ on the same deal with a header wrapped pipe BUT I will state that you CAN hold you hand on the header wrapped pipe... Any takers?
I am a little confused by this.. Hotter pipes will raise the peak operating rpms not lower (like stated above)
Having said all that.. if you think pipe coatings are really holding in a bunch of heat.. I got some $$$ that say you can not hold you hand on ANY coated pipe for 10 sec after it as been run... I also got some $$$ on the same deal with a header wrapped pipe BUT I will state that you CAN hold you hand on the header wrapped pipe... Any takers?
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Killerk
Well-known member
I think I am going to invest in an rc car heat guage to do some testing.
Would be good to know real world underhood heat results on similar sleds.
The reason cat sleds or any manufactures sleds rust is due to open trailers with no cover.
Has nothing to do with brand specific.
Trailer in an enclosed trailer or put your cover on and you will not get rust.
Would be good to know real world underhood heat results on similar sleds.
The reason cat sleds or any manufactures sleds rust is due to open trailers with no cover.
Has nothing to do with brand specific.
Trailer in an enclosed trailer or put your cover on and you will not get rust.
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RKT
Well-known member
True.. The rust is from outside storage
I do think there is some heat retention with a GOOD coating and it will lower under-hood temps SOME.. But I do not believe that these coatings will retain enough heat to alter the pipe's operating rpms.
Just my opinion..based on experience
Kelsey
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HILCLMR
Member
Okay, Kelsey, amery3, thanks for the input. I'm just concerned about melting my hoods as the pipes are quite close and they do get warm. I also didn't want to spend the cash coating these pipes if it was going to make them change the engine RPM's. The pipes are a one off and didn't want to wreck them. I can live with the black, just the melting of a $300 hood in 10 mins of riding kinda irks me. Like I said before I'll clean em paint em and be done. BTW Kelsey can you make a set of 900 cat heads for this thing that'll be able to run on nitrous?
Thanks Guys
Mike
Thanks Guys
Mike
