break in
Seasoned HDF Member
Joined: Nov 2006
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From: la la land jerzey
evo motors are the easiest and the most forgiving + 1 on the drive it like you normally do well that is if your a human being -
antique bikes that shair oil and gas in the same tank with different compartments - when the motor is new will boil the gas in the shaired tank from the hot oil, i have seen the paint peel on some -
evos dont have that added little drama knowing the fuel tank is 60 plus years old and soldered together not welded
antique bikes that shair oil and gas in the same tank with different compartments - when the motor is new will boil the gas in the shaired tank from the hot oil, i have seen the paint peel on some -
evos dont have that added little drama knowing the fuel tank is 60 plus years old and soldered together not welded
Elite HDF Member
Joined: Oct 2005
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From: Canton, Michigan
Club Member
Joined: Jun 2007
Posts: 45,429
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From: Bedford UK
His opening remarks do, regarding improved manufacturing methods, including cylinder honing. What he omits to say is that manufacturers are also using superior materials and design, in large part due to EPA noise and emissions regulations.
One of the most noteworthy improvements in recent engine design is the reduction of 'parasitic losses'. By using superior materials the reciprocating parts can be reduced in weight, friction losses can be reduced, also inertia losses. A simple example is the 'beehive' valve spring, which use a smaller diameter spring keeper, also light spring (because of the reducing diameter coils), but these are possible due to lighter weight valves. So the power from the crankshaft, required to open each valve, is lower. This approach continues throughout even our latest Harley engines (and my S&S Evo!).
One of the reasons synthetic oils are suitable, despite being thinner than p1ss, is that running clearances between mating moving parts are also less. I could go on! Such things do offer the prospect of shorter running in times.
One of the most noteworthy improvements in recent engine design is the reduction of 'parasitic losses'. By using superior materials the reciprocating parts can be reduced in weight, friction losses can be reduced, also inertia losses. A simple example is the 'beehive' valve spring, which use a smaller diameter spring keeper, also light spring (because of the reducing diameter coils), but these are possible due to lighter weight valves. So the power from the crankshaft, required to open each valve, is lower. This approach continues throughout even our latest Harley engines (and my S&S Evo!).
One of the reasons synthetic oils are suitable, despite being thinner than p1ss, is that running clearances between mating moving parts are also less. I could go on! Such things do offer the prospect of shorter running in times.
Tourer
Joined: Jun 2013
Posts: 272
Likes: 5
From: pomgolia
lunched both motors
I'd switch to an Andrews cam as their quality and longevity is from my experience far better than crane.
that apart running in, give it a few short hard full throttle blasts to force the rings hard out against the bores and bed them in
change oil after 50 miles to get rid of any crap that has got into motor
babying motors and running them in slowly usually glazes the bores and from my experience you end up with a smoking slow motor with lots of blowby and poor performance
Outstanding HDF Member
Joined: Jul 2013
Posts: 2,874
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From: Houston, TX
I just rode mine after the ball hone and re-ring. I gave it some good full throttle runs up to 3k and let it engine brake all by itself. My first fifty miles were mostly spent on tracking down a bad leak though....
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cbaker1@farmersagent.com
General Harley Davidson Chat
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Apr 16, 2011 08:42 AM
