Why do these bikes sound different?
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,123
Likes: 7,644
From: Poolville
I have heard that a low idle like that causes premature stress on the crank pin instead of the mass rotating smoothly it's banging the crank pin each time it fires which is not good for the crank pin...
Banned
Joined: May 2018
Posts: 4,576
Likes: 978
From: Viet Vet, crossroads
Why not? During the rebuild I did I got oil from the rockers when cranking the engine by turning the rear wheel by hand. I got even more when cranking it on the starter which is about 200 rpm. Why would there be no oil at 500 rpm?
My pressure gauge tells me there is oil, even about as much as 400 rpm higher. On hot days there is 0 psi, but then there is also 0 psi at 900 rpm. For what oil pressure is worth in a roller bearing engine...
My pressure gauge tells me there is oil, even about as much as 400 rpm higher. On hot days there is 0 psi, but then there is also 0 psi at 900 rpm. For what oil pressure is worth in a roller bearing engine...
Do as you wish
Cruiser
Joined: Aug 2008
Posts: 190
Likes: 25
From: Rotterdam, Netherlands
Which book do you have? Not trying to be thick here, really like to know what is where, cause my book states to keep idle around 1000, but it does not say anything about no oil when going any lower. Or at least not where I am looking 
Last edited by Daedalus; Jul 23, 2018 at 08:50 AM.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,123
Likes: 7,644
From: Poolville
Why not? During the rebuild I did I got oil from the rockers when cranking the engine by turning the rear wheel by hand. I got even more when cranking it on the starter which is about 200 rpm. Why would there be no oil at 500 rpm?
My pressure gauge tells me there is oil, even about as much as 400 rpm higher. On hot days there is 0 psi, but then there is also 0 psi at 900 rpm. For what oil pressure is worth in a roller bearing engine...
My pressure gauge tells me there is oil, even about as much as 400 rpm higher. On hot days there is 0 psi, but then there is also 0 psi at 900 rpm. For what oil pressure is worth in a roller bearing engine...
Cruiser
Joined: Aug 2008
Posts: 190
Likes: 25
From: Rotterdam, Netherlands
Thats the oil weight I'm using and thats what my gauge is normally showing me, also at 500 rpm! When it goes over 30 degrees C outside, which it regularly does in the past weeks, it's 0. But again, oil pressure in an engine with open bearings doesn't mean much, so its a non issue anyway.
Last edited by Daedalus; Jul 23, 2018 at 09:55 AM.
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,613
Likes: 3,380
From: Cental, MI
Yer the Guy that reads the Rule Book and Points out all the **** we didn't tell ya Not to Do!!!!
Do Whatever ya want to... Keep a Bottom end on the Shelf... Thats what I do!!!!
Last edited by Racepres; Jul 23, 2018 at 09:48 AM.
Banned
Joined: May 2018
Posts: 4,576
Likes: 978
From: Viet Vet, crossroads
I hate saying something I can't back up,
so far the only thing I have found is recommended idle of 900 to 1000, but no reasons.
I will search .
so far the only thing I have found is recommended idle of 900 to 1000, but no reasons.
I will search .
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Cruiser
Joined: Aug 2008
Posts: 190
Likes: 25
From: Rotterdam, Netherlands
Brinneling is contact welding. For a crank it means debris getting pressed on to the surface with so much stress it gets welded onto it. Its characteristic for engines with open bearings like Harley engines, but it usually happens under great stress. On idle speeds, the engine is virtually doing nothing
Last edited by Daedalus; Jul 23, 2018 at 09:55 AM.
Banned
Joined: May 2018
Posts: 4,576
Likes: 978
From: Viet Vet, crossroads
Brinneling is contact welding. For a crank it means debris getting pressed on to surface with so much stress it gets welded onto it. Its characteristic for engines with open bearings like Harley engines, but it usually happens under great stress. On idle speeds, the engine is virtually doing nothing
This of course was referring to new cars with fairly low miles and very early U joint failures
"Brinelling
Brinelling is the permanent indentation of a hard surface. It is named after the Brinell scale of hardness, in which a small ball is pushed against a hard surface at a preset level of force, and the depth and diameter of the mark indicates the Brinell hardness of the surface.More at Wikipedia"
