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 Post subject: Superfinishing
 Post Posted: Sun Aug 13, 2017 10:56 pm 
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Victor Meldrew
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Location: Worcester
I'd never heard of this process until one of the chaps on the Honda Twins site posted a photo of his 175 gearbox that he'd had treated to this. Looks spiffing !

Image

http://www.racedevelopments.co.uk/assets/documents/suzuki_gsxr1000_k1/superfinish.pdf

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 Post subject: Re: Superfinishing
 Post Posted: Mon Aug 14, 2017 10:33 am 
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Needs to get out more!
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Wow - the parts all look brand new :eek


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 Post subject: Re: Superfinishing
 Post Posted: Mon Aug 14, 2017 11:02 am 
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Knob Magnet
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Location: Catterick, North Yorkshire
What is the advantage over dull???
you cant see inside a gearbox once built!!

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 Post subject: Re: Superfinishing
 Post Posted: Mon Aug 14, 2017 1:07 pm 
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Hornet Lord
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Location: Somerset
370steve wrote:
What is the advantage over dull???


+1 but I think it's what it's doing to the already shiney bits that worries me.

I can't help think it's snake oil. Once an engine has 'broken in' it's interfacing parts have polished against each other and thus the engine is 'run in', isn't it?

I can see an argument for doing this to a brand new engine, maybe... but to take metal off a gear that has already bedded in (against its pair) is just opening up the tolerance and making neither surface fit again.

I read an article once about "blue printing" an engine and the engineer said what he does is basically examine every gear and remove any alloy that has become squished into the teeth, as this is what robs power. Hence the need for very short oil changes on initial break in.


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 Post subject: Re: Superfinishing
 Post Posted: Mon Aug 14, 2017 2:03 pm 
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Needs to get out more!
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Location: In The Garage
Quote:
What is the advantage over dull???
you cant see inside a gearbox once built!!


Brilliant if you've got a glass crankcase :angel


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 Post subject: Re: Superfinishing
 Post Posted: Mon Aug 14, 2017 2:27 pm 
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Hornet Lord
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Posts: 556
Location: Newark on Trent
Spiffing.
Now that's a real adjective.

A nice touch to the cogs too, Richard.

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 Post subject: Re: Superfinishing
 Post Posted: Mon Aug 14, 2017 4:51 pm 
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Victor Meldrew
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Location: Worcester
No, I couldn't really see the point and expense of doing this on a 40 year 18 bhp engine. The guy wants to get his crank apart and have that done as well. Already got a reground and resurfaced cam and rockers at great expense from the US. Again, I can't see the point, 5% of 18 if he's lucky.

That said, it does look nice, and would be a joy to reassemble.

The Race Developments blurb does claim all sorts of benefits on new parts, and 3-4 microns isn't that much to remove. (0.003 - 0.004 mm). Or a gnats cock ....

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Ten years have got behind you
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