supra5677
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Posts: 1279
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posted April 27, 2007 07:43 AM
zx12r dyno break in
How does a break in dyno work?
   
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TRNorBRN6001
Needs a job
Posts: 2021
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posted April 27, 2007 12:15 PM
I think Entropy might have a secret dyno break in method that he might be willing to share.
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TFA 200MPH CLUB MEMBER!
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted April 27, 2007 03:13 PM
 Edited By: dougmeyer on 27 Apr 2007 16:14
If you mean "How do you break in an engine on a dyno?". There's nothing hi-tech there. You just let the engine (bike) run under a light, constant load, increasing the load (throttle opening) over time. A couple hours will do it, and then do a pull or two to wide open throttle.
Done deal- go race.
Now, it just occured to me that you might not be familiar with a dyno that can provide a constant load. If you've only used a Dyno Jet dyno that only measures wheel acceleration and does not have an electro-brake to hold the engine at a constant RPM while measurng torque, you can't really do a break-in on that kind of dyno. This is also why dynos like that were less than optimum for engine development. You have to be able to hold the engine at a given rpm at wide open throttle indefinitely to do that kind of work properly.
While on the subject of break-in, I've long ago stopped worring about "miles of use". What is important is time, not distance. You could drive forever at a light load and not really accomplish a proper break-in. But in 2-3 hours of varying load, culminating in a couple of full throttle blasts, you've got the job done about as well as it will get.
Doug
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supra5677
Pro
Posts: 1279
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posted April 28, 2007 06:03 AM
thx
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deathpulse
Pro
Posts: 1688
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posted April 30, 2007 12:57 PM
Doug - that is the BEST damn break in advice I've ever seen. How do you learn all of this stuff? Man. This site continues to be the best source for good info!!
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ninja12
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Posts: 3310
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posted May 02, 2007 07:33 PM
Doug,
would a couple days of city riding do the same thing?
stop and go with constant changing load, 2-3 heat cycles.
Then a couple full speed passes and a oil change.
I see more builder agree that less breakin is needed with new style engines.
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dougmeyer
Needs a job
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Posts: 2713
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posted May 02, 2007 08:58 PM
That's the idea. Progressive loads and heat. The less steady state the better. Modern ring/cylinder break-in occurs in hours, modern machine finishing techniques and dimensional control leave surfaces that don't change much when first run.
This is not to say that things don't get progressively better over much more time, but that the initial period where it used to be thought that you would "hurt" your engine is much shorter.
A well used, well maintained engine really will pick up power over hundreds of hours.
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