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06-29-2012, 04:51 AM
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Club Chopper Member
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Join Date: Nov 2011
Location: Mildura,
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Bike Year, Make, Engine: Harley 89 Heritage 127 ultima
Posts: 406
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lean or rich
I hear a lot of motors running that are cammy and when rolling with no throttle down low in the rpm's have a loopy loopy sound to them do you think it is a lean fuel condtion or a rich fuel condtion. whats your thoughs....
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06-29-2012, 05:41 AM
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Club Chopper Member
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Join Date: Nov 2010
Location: Fort Worth,
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Bike Year, Make, Engine: 2007 CFL
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I think it's the design of the cam profile. Duration and overlap.
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06-29-2012, 05:58 AM
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Join Date: Apr 2009
Location: griffin,
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Bike Year, Make, Engine: bdm mastiff,bdm pitbull,
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that has nuttin to do with rich or lean as posted by above.. some people do set the idel speed down way low... but that is bad for oil pressure & flow.... try & maintain 850-1000 rpm...
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06-29-2012, 06:51 AM
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Location: W.Columbia,
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Yep, 06 got it right on!
Idle your motor too low rpm's and it will shorten the life expectancy of the motor greatly.
It may sound great to you but you are paying the price.
***
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06-29-2012, 04:18 PM
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Club Chopper Member
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Join Date: Nov 2011
Location: Mildura,
au
Bike Year, Make, Engine: Harley 89 Heritage 127 ultima
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thanks fellas i'm not talking potato potato here and low idles. my motor idles at 950 rpm it dont like any lower than that. i am talking a fuel condtion where the pilet jet is in my opinion is to lean, or there is a inlet manifold leak. i hear it all the time and wonder if other people here it also and know what it is that causes it, sure overlap in cam profiles will cause ruffness in idle and just above but this kind of thing should not happen at all when a motor has no air fuel happening due to throttle shut off. are you hearing me now
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06-29-2012, 04:22 PM
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Join Date: Aug 2004
Location: CHICAGO,
IL
Bike Year, Make, Engine: 2006 FLYRITE BOBBER, 2002 NIGHT TRAIN
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+1 on that. I keep mine @ 950-1000 RPM and I had a couple of Harley guys
pull up next to me and tell me my idle was too high. I said "thank you ladies"!
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06-29-2012, 05:37 PM
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Club Chopper Member
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Join Date: Jun 2008
Location: South Texas,
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Bike Year, Make, Engine: chopped hardtail 100"Evil Evo
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the old pans and shovels do idle a lot lower than these new motors but then again they only need 6 or 8 pounds of oil pressure and at idle its not uncommon to see them drop to 2 pounds or less. 
At low idle a long duration cam will "breath" both on the intake and exhaust. Some long duration cams will even spit gas out the carb at idle. A big Lienweber will spit almost a soda cap of gas out the carb when you shut it down.
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06-29-2012, 05:57 PM
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Club Chopper Member
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Join Date: Nov 2011
Location: Mildura,
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Bike Year, Make, Engine: Harley 89 Heritage 127 ultima
Posts: 406
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thats true Red you only have to look at a funny car to understand that. So what you are saying is that the duration of the cam profile and lift is whats causeing the loopy loopy type of sound from a over tuned motor.
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06-29-2012, 06:02 PM
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Bike Year, Make, Engine: chopped hardtail 100"Evil Evo
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probably so if the valves are good and the lifters aren't too tight.
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Just tryin to make it in this fuked up world without gettin busted for some bullshit thing
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06-29-2012, 08:32 PM
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Club Chopper Member
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Join Date: Nov 2011
Location: Mildura,
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Bike Year, Make, Engine: Harley 89 Heritage 127 ultima
Posts: 406
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yep all new, good shit mate hope you guys have nice rideing weather over there. thanks man.
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