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Ian Harrison
Joined: 23 Nov 2006
Posts: 1671
Location: United Kingdom (Great Britain), Manchester
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 Posted: Mon Jul 23, 2012 2:24 am Post subject: Well it did make a funny noise!! |
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Hi Guys
In the event of a "funny noise", it might be best to stop the engine sooner rather than later.
Perhaps this driver lacked a certain amount of "mechanical sympathy" (to his cost).
After the bottom of the piston fell away the errant rod and pin must have been thumping the remaining top of the piston up to TDC where it fired and actually kept running while the pin tried to gouge itself out of the cylinder. A big chunk of piston debris was also punched out of the front of the crankcase. 
The only thing that stopped it was the plug being closed by a chunk of debris 
Best Regards
Ian 
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Ian Harrison
Viper Racing UK
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Benn Herr
Joined: 18 Jul 2001
Posts: 1584
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Chris Reinhardt
Joined: 29 Aug 2002
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Location: United States, New York, Ossining
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Andy Kiker
Joined: 22 Nov 2003
Posts: 460
Location: United States, New Jersey,
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| Posted: Mon Jul 23, 2012 7:16 am Post subject: |
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Just a quick hone job and put it back together.
You would never have to worry about a four coner stick.  
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James Ingram
Joined: 25 Nov 2004
Posts: 148
Location: United States, Texas, Dallas, TX /Park City, UT
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| Posted: Mon Jul 23, 2012 8:30 am Post subject: |
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I think I would use acid in this case. Drop the whole mess into a 5 gal bucket about 2/3 full of acid and come back and check it in a week.
JI |
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Ian Harrison
Joined: 23 Nov 2006
Posts: 1671
Location: United Kingdom (Great Britain), Manchester
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| Posted: Mon Jul 23, 2012 8:49 am Post subject: |
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Hey Jim and Andy
I think your right with the crank and the cylinder. Hopefully the right hand crankcase will repair OK, though!!
Best Regards
Ian
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Ian Harrison
Viper Racing UK
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+44 161 343 2009
Championship winning Superkart race team 1997-2012 |
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Chris Hegar
Joined: 25 Jun 2002
Posts: 3537
Location: United States, Oregon, Portland
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| Posted: Mon Jul 23, 2012 3:35 pm Post subject: |
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That's one of those ya kinda start to lean away from as it happens. "ahhh that's not good, Dad's gonna be pissed." 
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Chris Reinhardt
Joined: 29 Aug 2002
Posts: 2951
Location: United States, New York, Ossining
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| Posted: Mon Jul 23, 2012 5:59 pm Post subject: |
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That's not a crack, geez, I patched up a GSXR case the other day it had a hole in it the size of a halve dollar!!! If I lived near by I'd weld that one for nothing!!!!
CR
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Racer Johnson
Joined: 08 Feb 2009
Posts: 116
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| Posted: Mon Jul 23, 2012 6:53 pm Post subject: |
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lol I know that feeling chris! its usually hauling ass then it loses a couple hundred rpm right before it goes......its like sh%$t and your reaching for the clutch when it ties up. or in the laydown days your rapidly reaching for the needles......whack!! silence.... air sound....... then its like ok wheres my best viewing area for the rest of the race.....
-Eric |
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Bobby Butler
Joined: 26 Nov 2004
Posts: 384
Location: United States, Louisiana, HOUMA
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| Posted: Mon Jul 23, 2012 8:18 pm Post subject: Blown cr |
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The gasket looks pretty good!
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Gerry MacNutt
Joined: 14 Apr 2012
Posts: 114
Location: Canada, not USA state,
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| Posted: Mon Jul 23, 2012 10:24 pm Post subject: |
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| What make of piston and time on it? |
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Ian Harrison
Joined: 23 Nov 2006
Posts: 1671
Location: United Kingdom (Great Britain), Manchester
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| Posted: Tue Jul 24, 2012 12:25 am Post subject: |
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Hi Gerry
Whatever piston, from questioning the driver (who was new to the sport), it had been in way too long!!
I'm pretty sure from the markings still visible on the top of the piston that it was a Prox which is actually an ART piston. ART also manufacture genuine Honda pistons.
Nothing wrong with the piston choice, but as I say nothing lasts forever!!
Best Regards
Ian
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Ian Harrison
Viper Racing UK
www.viper-racinguk.co.uk
sales@viper-racinguk.co.uk
+44 7984 225 564
+44 161 343 2009
Championship winning Superkart race team 1997-2012 |
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Ian Harrison
Joined: 23 Nov 2006
Posts: 1671
Location: United Kingdom (Great Britain), Manchester
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| Posted: Tue Jul 24, 2012 12:28 am Post subject: |
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Hi Chris
Shame your not across the road, you would have got the job, especially at that price 
But to be honest, there is a little more than welding up the cracks. The crank chamber walls have been pushed out a fair amount and bolt holes are ovalled and squashed. We all know what happens when you try and push those walls back into place.
However, I'm sure my man with the TIG will be able to do the bizz.
Best Regards
Ian
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Ian Harrison
Viper Racing UK
www.viper-racinguk.co.uk
sales@viper-racinguk.co.uk
+44 7984 225 564
+44 161 343 2009
Championship winning Superkart race team 1997-2012 |
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Chris Reinhardt
Joined: 29 Aug 2002
Posts: 2951
Location: United States, New York, Ossining
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| Posted: Tue Jul 24, 2012 4:23 am Post subject: |
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Ian, do you have a way of trueing the cases when your done patching them up? With all that welding and damage as you described, it's going to move those bearing pockets a might bit....
CR
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Ian Harrison
Joined: 23 Nov 2006
Posts: 1671
Location: United Kingdom (Great Britain), Manchester
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| Posted: Tue Jul 24, 2012 7:24 am Post subject: |
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Hi Chris
Not a specific piece of kit. Worst case scenario is that it's either scrapped or we have to sleeve the main bearing housings with pressed in steel sleeves. With the crankcases being reasonably inexpensive, it dosen't take too much before replacement is the best (and easiest) option.
Of course the cases are evenly pre-heated to 275 degC (527F) prior to weding.
Best Regards
Ian
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Ian Harrison
Viper Racing UK
www.viper-racinguk.co.uk
sales@viper-racinguk.co.uk
+44 7984 225 564
+44 161 343 2009
Championship winning Superkart race team 1997-2012 |
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