Why not a potato sounding idle?
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6th Gear
Joined: Nov 2009
Posts: 14
Likes: 0
From: Bossier City, Louisiana
seems like the tighter tolerances would enable a lower viscosity oil for less friction. If these EVO engines have an oil pressure problem at a lower idle, is there any way of getting a higher volume oil pump into the engine or shimming a relieve valve? If I used a higher viscosity oil would that keep the pressure up for a lower idle? With my experiences in loose engines, the oil pressure is lower with bigger tolerances and that will lead to engine failure quicker than the same engine with tighter clearances.
Guess I will have to research that one a little more. Sure this engine is different than the older ones, but did HD make it less reliable? Are the older engines more bullet proof than these EVO's if comparing stock to stock? Anyway, ULTRA, how did you set your idle lower? Is there an air screw like in some cars or do you have to reprogram the idle. I have that option with my 2005 Pontiac GTO with my plug in tuner.
Russ
Guess I will have to research that one a little more. Sure this engine is different than the older ones, but did HD make it less reliable? Are the older engines more bullet proof than these EVO's if comparing stock to stock? Anyway, ULTRA, how did you set your idle lower? Is there an air screw like in some cars or do you have to reprogram the idle. I have that option with my 2005 Pontiac GTO with my plug in tuner.
Russ
Club Member
Joined: Nov 2008
Posts: 5,481
Likes: 4
From: Georgia
seems like the tighter tolerances would enable a lower viscosity oil for less friction. True If these EVO engines have an oil pressure problem at a lower idle, is there any way of getting a higher volume oil pump into the engine or shimming a relieve valve? If I used a higher viscosity oil would that keep the pressure up for a lower idle? With my experiences in loose engines, the oil pressure is lower with bigger tolerances and that will lead to engine failure quicker than the same engine with tighter clearances.
Guess I will have to research that one a little more. Sure this engine is different than the older ones, but did HD make it less reliable? Are the older engines more bullet proof than these EVO's if comparing stock to stock? Anyway, ULTRA, how did you set your idle lower? Is there an air screw like in some cars or do you have to reprogram the idle. I have that option with my 2005 Pontiac GTO with my plug in tuner.
Russ
Guess I will have to research that one a little more. Sure this engine is different than the older ones, but did HD make it less reliable? Are the older engines more bullet proof than these EVO's if comparing stock to stock? Anyway, ULTRA, how did you set your idle lower? Is there an air screw like in some cars or do you have to reprogram the idle. I have that option with my 2005 Pontiac GTO with my plug in tuner.
Russ
I'll leave your other questions for somebody else.
Road Master
Joined: Jan 2008
Posts: 874
Likes: 2
From: Southern Arizona
The older bikes had an external oil pump that was not as efficient, but could pump oil at lower RPMs. The twin cam engine has an internal twin-gerotor pump that creates more pressure and flow, but not at very low RPMs, so no Potatos, unless you want to rebuild your top end due to oil starvation.
Outstanding HDF Member
Joined: Dec 2009
Posts: 2,502
Likes: 6
From: Lapeer , Mich
seems like the tighter tolerances would enable a lower viscosity oil for less friction. If these EVO engines have an oil pressure problem at a lower idle, is there any way of getting a higher volume oil pump into the engine or shimming a relieve valve? If I used a higher viscosity oil would that keep the pressure up for a lower idle? With my experiences in loose engines, the oil pressure is lower with bigger tolerances and that will lead to engine failure quicker than the same engine with tighter clearances.
Guess I will have to research that one a little more. Sure this engine is different than the older ones, but did HD make it less reliable? Are the older engines more bullet proof than these EVO's if comparing stock to stock? Anyway, ULTRA, how did you set your idle lower? Is there an air screw like in some cars or do you have to reprogram the idle. I have that option with my 2005 Pontiac GTO with my plug in tuner.
Russ
Guess I will have to research that one a little more. Sure this engine is different than the older ones, but did HD make it less reliable? Are the older engines more bullet proof than these EVO's if comparing stock to stock? Anyway, ULTRA, how did you set your idle lower? Is there an air screw like in some cars or do you have to reprogram the idle. I have that option with my 2005 Pontiac GTO with my plug in tuner.
Russ
Last edited by 1st 96 ultra; Mar 28, 2010 at 07:12 AM.
Extreme HDF Member
Joined: Nov 2006
Posts: 13,389
Likes: 26
From: Windham,Maine
Are you confused yet! A lot of what is written is not so.,All Harley motors will sound the same provided they are built the close to the same.If all you want is that sound,there has to be someone near you that can help.Good Luck.
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