Yazza54
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| posted on 25/2/11 at 06:26 PM |
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R1 cam change
As I'm now keeping the fury I want to fit the Kent cams I have... Am intending to raise the compression slightly at the same time. I'm not
particularly worried about timing etc but should I be worried about piston valve contact? Anyone done this or anything similar have any tips?
Engine is a STD 5pw r1
I'm unhappy cos I eat and I eat cos I'm unhappy
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A1
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| posted on 25/2/11 at 06:59 PM |
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can you measure it up to see? like cam lift vs height above piston...
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Yazza54
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| posted on 26/2/11 at 11:21 AM |
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Probably but surely someones done it before
I'm unhappy cos I eat and I eat cos I'm unhappy
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Major Stare
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| posted on 26/2/11 at 07:58 PM |
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quote:
Originally posted by Yazza54
Probably but surely someones done it before
Yes they have........ and stop calling me Shirly 
Jon "FISH"
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Yazza54
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| posted on 26/2/11 at 08:00 PM |
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Help pls 
I'm unhappy cos I eat and I eat cos I'm unhappy
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matt_gsxr
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| posted on 26/2/11 at 09:54 PM |
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Isn't this the old "rebuild with thin layer of plasticine on the piston top".
Then reassemble and turn over by hand (super carefully no spark plug), take apart and see what the plasticine looks like.
Worth getting the plasticine reasonably warm (softer) and spraying with wd40 so it doesn't stick to the valve and piston.
Not sure how much valve to piston clearance you need, but I am sure Adi (fount of all R1 knowledge) will be on for that.
The other thing to look out for is the piston walloping the end of the plug. You can space the plug back with m10 copper banjo bolt washers if that is
too close.
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adithorp
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| posted on 26/2/11 at 10:22 PM |
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quote:
Originally posted by matt_gsxr
...I am sure Adi (fount of all R1 knowledge) will be on for that...
Don't drag me into this. I was just reading it hoping to learn something.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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matt_gsxr
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| posted on 26/2/11 at 10:42 PM |
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quote:
Originally posted by adithorp
quote:
Originally posted by matt_gsxr
...I am sure Adi (fount of all R1 knowledge) will be on for that...
Don't drag me into this. I was just reading it hoping to learn something.
sorry, you aren't going to learn anything from me (except bad habits)
The Graham Bell book suggests clearance of 60thou (1.5mm), my attitude is that a miss is as good as a mile! But I treat engines as disposable
learning tools.
Graham Bell excerpt
The link describes the process that I tried to, and another method.
Matt
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mikemph
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| posted on 27/2/11 at 08:27 AM |
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I am pretty sure the 1.5mm is to allow for rod stretch at high rpm and expansion as things warm up.
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Big CC Racing
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| posted on 27/2/11 at 11:50 AM |
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quote:
Originally posted by Yazza54
As I'm now keeping the fury I want to fit the Kent cams I have... Am intending to raise the compression slightly at the same time. I'm not
particularly worried about timing etc but should I be worried about piston valve contact? Anyone done this or anything similar have any tips?
Engine is a STD 5pw r1
If your intending to skim the head & fit race camshafts you should be worried about the cam timing as it will affect the piston to valve contact.
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