Interesting article

Martin F · 5th November 2003, 11:50 PM

http://www.mototuneusa.com/break_in_secrets.htm

Interesting theory.

wez · 6th November 2003, 09:53 AM

Cool find

alex h · 30th April 2004, 03:02 PM

Moved to beef up the fledgeling Tech Corner

Ian C · 5th May 2004, 03:42 PM

Way too many exclamation marks.

His main argument seems to be around the friction of piston rings on the honed surface of the cylinder wall. Trouble is, he seems to think the honing roughness will be "used up" in 20 miles no matter how hard the ring is pushed against it. My common sense (and I think the laws of physics) says that the harder it gets pushed the faster it will be used up so either method does the same amount of smoothing down the cylinder wall and bedding in of the piston ring, just that the "slow" running in period does it over more time with more sympathy.

It's like sanding - the running-in period starts with light pressure of a rough grit, and gradually moves to more pressure with finer grit as the roughness gets worn away and the cylinder pressures increase. This article suggests that piling in with rough grit at full pressure for a few minutes will do the job perfectly. Hmmm.

-Ian

Darren Blake · 7th May 2004, 11:51 AM

We tend to break in green engines here by running a series of powercurves on them on the dyno. We have in the past run engines in "hard" if they have been rebuilt and there is a lot of wear present in the bores already.

Not at all sure about the piston pic. How the hell has he managed to seal the top land off from the combuistion gases? The top land should be coloured at the very least.

5th November 2003, 11:50 PM	#1
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	http://www.mototuneusa.com/break_in_secrets.htm Interesting theory. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

6th November 2003, 09:53 AM	#2
wez Senior Member Join Date: Sep 2003 Location: Heathrow Posts: 271	Cool find __________________ 96 Silver T-6, S6GP ECU, 591bhp & 523ft/lbs, CW SMIC Dyno Plot Photo Gallery Turbos Compared 2BarTuning Steve Manley 01865 291300

30th April 2004, 03:02 PM	#3
alex h Old Timer Join Date: Sep 2003 Location: East UK Posts: 887	Moved to beef up the fledgeling Tech Corner __________________ Regards Alex H

7th May 2004, 11:51 AM	#5
Darren Blake Member Join Date: Sep 2003 Location: Norwich, UK Posts: 58	We tend to break in green engines here by running a series of powercurves on them on the dyno. We have in the past run engines in "hard" if they have been rebuilt and there is a lot of wear present in the bores already. Not at all sure about the piston pic. How the hell has he managed to seal the top land off from the combuistion gases? The top land should be coloured at the very least. __________________ Darren Blake Signature Nazi.

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5th May 2004, 03:42 PM	#4
Ian C Member Join Date: Sep 2003 Location: Norwich Posts: 57	Way too many exclamation marks. His main argument seems to be around the friction of piston rings on the honed surface of the cylinder wall. Trouble is, he seems to think the honing roughness will be "used up" in 20 miles no matter how hard the ring is pushed against it. My common sense (and I think the laws of physics) says that the harder it gets pushed the faster it will be used up so either method does the same amount of smoothing down the cylinder wall and bedding in of the piston ring, just that the "slow" running in period does it over more time with more sympathy. It's like sanding - the running-in period starts with light pressure of a rough grit, and gradually moves to more pressure with finer grit as the roughness gets worn away and the cylinder pressures increase. This article suggests that piling in with rough grit at full pressure for a few minutes will do the job perfectly. Hmmm. -Ian

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