Dyno Runs on Fresh Motors
#21
11-23-2014, 04:19 PM
First: You must explain what a "fresh" motor" is. Most of us put at least 1,000 miles before doing any dyno work.
Second: Why do you consider dynoing a motor as "instant killing" it? Done by a professional it will have better/proper A/F numbers than the stock motors which are set lean and run hot to meet the EPA restrictions. I'm no dyno expert but I've had multiple bikes Dyno'd w/o issue with any of them.
Second: Why do you consider dynoing a motor as "instant killing" it? Done by a professional it will have better/proper A/F numbers than the stock motors which are set lean and run hot to meet the EPA restrictions. I'm no dyno expert but I've had multiple bikes Dyno'd w/o issue with any of them.
#22
11-23-2014, 04:47 PM
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Ran my SGS120R an even 1000 miles then dyno'ed it. No problems. Limited rpm's during break-in to 4500.
Our race car engines are all broken-in on dyno. Think anybody's gonna put 1000 miles on a race engine (or chassis) before dyno tuning? Who's got the facilities (think race course and crew) to do that? Some of these engines are tuned to run thousands of miles under race conditions. That says something about reliability and longevity from breaking-in on a dyno.
Our race car engines are all broken-in on dyno. Think anybody's gonna put 1000 miles on a race engine (or chassis) before dyno tuning? Who's got the facilities (think race course and crew) to do that? Some of these engines are tuned to run thousands of miles under race conditions. That says something about reliability and longevity from breaking-in on a dyno.
#23
11-23-2014, 04:54 PM
I think we need to make one determination first before answering this question.
With a knowledgeable dyno operator, who knows that it's a brand new motor, he will treat it as such and do the proper tune for a brand new motor.I would think that he'd treat it entirely than if it's a motor with miles on it. With an 'old' motor he could skip the 'new motor' part and go right to the tuning phase.
With a knowledgeable dyno operator, who knows that it's a brand new motor, he will treat it as such and do the proper tune for a brand new motor.I would think that he'd treat it entirely than if it's a motor with miles on it. With an 'old' motor he could skip the 'new motor' part and go right to the tuning phase.
#24
11-23-2014, 05:02 PM
Road Warrior
I've been to the York Pa plant and watched them take every bike coming off the assembly line and run it on a dyno. They are not actually tuning them, but rather making sure that each bike meets predetermined bench marks. That being said, they do run them up to about 90mph. While they are not using drag race performance they don't baby them either. the 5 or 6 that I saw were run up to the limiter in most gears. They have digital displays so that people who take the Steel Toe tour can see the rpm's and mph. The tester has a bank of gauges and monitors in front of him
Anyhow, my point is that our bikes are put on a dyno a subjected to high rpm and speed at the factory, with no actual tuning being done. They also pull, at random, other bikes off the end of the line and move them to a separate room for more extensive testing. These bikes are then actually ridden on 15 mile loop around York to make sure all suspension, frame, etc. pieces are up to HD standards. These bikes are then, if they pass, put on the trucks and sent to the dealers for delivery.
The guy that was our tour guide told us that if we ever buy a new bike and it has less than 2 miles on it then something is amiss as that's
about what they put on them on the dyno. So, think about it. The bike comes off the line, gets run thru the gears to the limiter, to 90 mph
and taken off the dyn, all in 2 miles with no pre warm up. He also said that it's entirely possible to get a brand new bike that has as much as 17 miles on it due to the above testing.
Anyhow, my point is that our bikes are put on a dyno a subjected to high rpm and speed at the factory, with no actual tuning being done. They also pull, at random, other bikes off the end of the line and move them to a separate room for more extensive testing. These bikes are then actually ridden on 15 mile loop around York to make sure all suspension, frame, etc. pieces are up to HD standards. These bikes are then, if they pass, put on the trucks and sent to the dealers for delivery.
The guy that was our tour guide told us that if we ever buy a new bike and it has less than 2 miles on it then something is amiss as that's
about what they put on them on the dyno. So, think about it. The bike comes off the line, gets run thru the gears to the limiter, to 90 mph
and taken off the dyn, all in 2 miles with no pre warm up. He also said that it's entirely possible to get a brand new bike that has as much as 17 miles on it due to the above testing.
Nice info, thanks.
#25
11-23-2014, 05:30 PM
By fresh I mean having not been broken in with less than 1,000 miles on the new parts. I understand the need to tune it but a generic tune should suffice to get you break in miles put on until a proper tune on a Dyno. And yes, I think revving motor to redline is beating on it. It isn't babying it. I wonder if there are comparisons by third parties to back up either way. If HD puts them on a dyno, why wouldn't they break if in then?
#26
11-23-2014, 06:04 PM
Seasoned HDF Member
#27
11-23-2014, 06:07 PM
All you are doing is seating the rings, it doesn't take long. A couple heat cycles and a few miles.
#28
11-23-2014, 06:11 PM
There is one thing you absolutely must do, and that is to make sure the bike is warmed up before running it through the break in routine.
The bike has been run to the rev limiter before you bought it. Keeping it below 3,000 rpm after that is pointless.
You must generate enough combustion chamber pressure to push the rings out against the cylinder walls in order to properly seat them. This will not happen if you baby it, and after that it's too late.
There's a very good reason the MoCo doesn't recommend this, and lp's post above is correct...there's no way in hell they're going to tell a buyer who may be on the first bike over 250cc in his life to go out on the street and run it in a series of partial to full throttle runs to redline, and risk the guy running into the back end of a parked truck.
The bike has been run to the rev limiter before you bought it. Keeping it below 3,000 rpm after that is pointless.
You must generate enough combustion chamber pressure to push the rings out against the cylinder walls in order to properly seat them. This will not happen if you baby it, and after that it's too late.
There's a very good reason the MoCo doesn't recommend this, and lp's post above is correct...there's no way in hell they're going to tell a buyer who may be on the first bike over 250cc in his life to go out on the street and run it in a series of partial to full throttle runs to redline, and risk the guy running into the back end of a parked truck.
#29
11-23-2014, 06:47 PM
There is one thing you absolutely must do, and that is to make sure the bike is warmed up before running it through the break in routine.
The bike has been run to the rev limiter before you bought it. Keeping it below 3,000 rpm after that is pointless.
You must generate enough combustion chamber pressure to push the rings out against the cylinder walls in order to properly seat them. This will not happen if you baby it, and after that it's too late.
There's a very good reason the MoCo doesn't recommend this, and lp's post above is correct...there's no way in hell they're going to tell a buyer who may be on the first bike over 250cc in his life to go out on the street and run it in a series of partial to full throttle runs to redline, and risk the guy running into the back end of a parked truck.
The bike has been run to the rev limiter before you bought it. Keeping it below 3,000 rpm after that is pointless.
You must generate enough combustion chamber pressure to push the rings out against the cylinder walls in order to properly seat them. This will not happen if you baby it, and after that it's too late.
There's a very good reason the MoCo doesn't recommend this, and lp's post above is correct...there's no way in hell they're going to tell a buyer who may be on the first bike over 250cc in his life to go out on the street and run it in a series of partial to full throttle runs to redline, and risk the guy running into the back end of a parked truck.
Last edited by 95ci springer; 11-23-2014 at 06:49 PM.
#30
11-23-2014, 07:41 PM