Timing advance at idle
#1
09-10-2007 | 03:08 PM
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5th Gear
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#4
09-11-2007 | 07:58 AM
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Joined: Nov 2005
Posts: 5,926
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From: NE Ohio
RE: Timing advance at idle
ORIGINAL: Racerx296
On a 07 road king SERT, SE Air Cleaner, Rineheart tru duals, question is----> how do I get the idle to sound like the old carb days! I advanced the timing and lowerd idle speed to 900rpm its better but still sounds weak. Any ideas?
On a 07 road king SERT, SE Air Cleaner, Rineheart tru duals, question is----> how do I get the idle to sound like the old carb days! I advanced the timing and lowerd idle speed to 900rpm its better but still sounds weak. Any ideas?
#7
09-12-2007 | 01:18 PM
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Joined: Feb 2006
Posts: 43
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RE: Timing advance at idle
If you really want to mess with your idle here is one for 'ya. Get your race tuner out, set front cylinder from map 0-40 and from 500 - 1125 rpm to 12 deg advance and in the next cell at constant rpm to 16 and than back to 12 until you reach 40 map. Do the opposite with the rear cylinder by starting out with 15 deg advance and reduce it to 12. You got my idea? Objective is to destabilize the already uneven firing events even further. Try it out........
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sounds like a cool experiment. Have you done this yet?
#9
09-13-2007 | 06:50 PM
RE: Timing advance at idle
IMHO cams would be the safest way to accomplish the sound of the older carb bikes. As stated above, EFI bikes idle is set higher to make sure that the charging system is getting enough juice back to the battery. Also I believe factory idol is set to around 1000 rpm, another reason is oil flow to the motor. When you slow down the idol, you dont get as much oil and pressure to the motor, which will cause your bearings to start to go and so on. An S&S 510 cam is about the largest can you can bolt in a bike with no mods to the motor. What your really looking for in a cam for lope at idol will be its durration, not its lift. I know Ill catch some flack from some people around her by saying this, but lift doesnt have much to do with a cams performance, its really how long you can keep that valve open to get gas in and exhaust out. The size of the intake and exhaust runners will always stay the same size, thus lift of the cam will really wont make much of a differance as compared to durration.
Chris
Chris
#10
09-15-2007 | 09:17 PM
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Joined: Feb 2007
Posts: 7,663
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From: Northeast Ohio
RE: Timing advance at idle
ORIGINAL: sonar_chris
IMHO cams would be the safest way to accomplish the sound of the older carb bikes. As stated above, EFI bikes idle is set higher to make sure that the charging system is getting enough juice back to the battery. Also I believe factory idol is set to around 1000 rpm, another reason is oil flow to the motor. When you slow down the idol, you dont get as much oil and pressure to the motor, which will cause your bearings to start to go and so on. An S&S 510 cam is about the largest can you can bolt in a bike with no mods to the motor. What your really looking for in a cam for lope at idol will be its durration, not its lift. I know Ill catch some flack from some people around her by saying this, but lift doesnt have much to do with a cams performance, its really how long you can keep that valve open to get gas in and exhaust out. The size of the intake and exhaust runners will always stay the same size, thus lift of the cam will really wont make much of a differance as compared to durration.
Chris
IMHO cams would be the safest way to accomplish the sound of the older carb bikes. As stated above, EFI bikes idle is set higher to make sure that the charging system is getting enough juice back to the battery. Also I believe factory idol is set to around 1000 rpm, another reason is oil flow to the motor. When you slow down the idol, you dont get as much oil and pressure to the motor, which will cause your bearings to start to go and so on. An S&S 510 cam is about the largest can you can bolt in a bike with no mods to the motor. What your really looking for in a cam for lope at idol will be its durration, not its lift. I know Ill catch some flack from some people around her by saying this, but lift doesnt have much to do with a cams performance, its really how long you can keep that valve open to get gas in and exhaust out. The size of the intake and exhaust runners will always stay the same size, thus lift of the cam will really wont make much of a differance as compared to durration.
Chris
And cam "lift" does have a lot to do with performance,I am running 10.5:1, 2.0" valves, 50mm throttle body with SE high flow injectorsand a Woods .650 lift cam with short duration. It is a torque monster and builds great Hp even with the short duration, the cylinders fill efficiently due to the high lift. If lift didn't add to performance, no one would make high lift cams.