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PostPosted: Mon Feb 21, 2005 5:28 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22128
Location: Chicago
Pilotnut sent me his Engine, just as we figured...

The saga starts here http://pilotodyssey.com/PO/viewtopic.php?t=1111


Attachments:
File comment: See the problem?
Pnut-bearing.jpg
Pnut-bearing.jpg [ 20.9 KiB | Viewed 2076 times ]
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PostPosted: Mon Feb 21, 2005 5:28 pm 
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Location: Chicago
The other side


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PostPosted: Mon Feb 21, 2005 5:32 pm 
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Joined: Fri Dec 19, 2003 9:37 pm
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Location: Howell, New Jersey
I know that there has been much back-and-forth discussion on this topic, but what do you figure is the cause??


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PostPosted: Mon Feb 21, 2005 5:33 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
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Location: Chicago
Other things going on here, burning all the way down to the crank cases....


Attachments:
File comment: You can see the char on the gasket.
burn1.jpg
burn1.jpg [ 64.4 KiB | Viewed 2072 times ]
File comment: Carbon build up on the cases
burn2.jpg
burn2.jpg [ 65.3 KiB | Viewed 2072 times ]
File comment: Another burn spot on the gasket
burn3.jpg
burn3.jpg [ 39.5 KiB | Viewed 2072 times ]
File comment: Carbon looking build up seen here
burn4.jpg
burn4.jpg [ 61.04 KiB | Viewed 2072 times ]
File comment: Not as bad on this transfer
burn5.jpg
burn5.jpg [ 59.79 KiB | Viewed 2072 times ]
File comment: Its on both sides, here is other case.
Pnut-burn.jpg
Pnut-burn.jpg [ 63.37 KiB | Viewed 2072 times ]
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PostPosted: Mon Feb 21, 2005 5:38 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
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Location: Chicago
PilotNut wrote:
I know that there has been much back-and-forth discussion on this topic, but what do you figure is the cause??


Dunno, over heating? Why is it burning down the transfers? It has that wild ATVR hog it
out bigger is better porting, port timing so wild it is burning back into the transfers? Too
much duration? I dunno, you might call them and ask, maybe send them the pictures
by email?


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PostPosted: Mon Feb 21, 2005 6:38 pm 
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Location: Chicago
Pnut your cylinder measures 3.228 can you call Wiseco to see if they have a
piston kit that will fit your bore in stock? It would be nice if they had one
for a 3.229 that would allow me to hone your bore .001 larger to ensure
the rings seat well.

OR in other words you have a 577P8 Piston, you need another, can they go pull
30 of them off the shelf and measure each one then send you the biggest one..
Maybe they can make you a 577P9 ??? I have been told years ago guys kept
boring up to a CR450 why not go to 83mm ?


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PostPosted: Mon Feb 21, 2005 7:20 pm 
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Joined: Fri Dec 19, 2003 9:37 pm
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Location: Howell, New Jersey
Thanks for the info - I'll call Wiseco tomorrow to see what they have.


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PostPosted: Tue Feb 22, 2005 9:16 pm 
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Joined: Tue Dec 23, 2003 10:31 pm
Posts: 5523
Location: New Jersey
Hoser, are the cases damaged like More's CSI?


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PostPosted: Sat Mar 05, 2005 1:36 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
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Location: Chicago
Nope not damaged like More's CSI, here is the exhaust port of Pilotnuts and
mine.


Attachments:
portmap.jpg
portmap.jpg [ 35.8 KiB | Viewed 1366 times ]
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PostPosted: Sun Mar 06, 2005 9:04 pm 
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Location: Howell, New Jersey
Hoser - what does the tracing of the ports tell us?? Does this offer any clues into why my motor (( Internal Combustion Engine ? )) was burning down into the crankcase?


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PostPosted: Sun Mar 06, 2005 9:44 pm 
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Joined: Sun Dec 28, 2003 10:38 pm
Posts: 228
Location: Knoxville, TN
In the very least it means that your exhaust port timing is HUGE! I may have grown considerably with each successive bore and hone. The port is a lot larger than hoser's, and this could be why you see burning down into the crank cases like you do. It means that the piston isn't completely closing off the intake/ or possibly the transfer ports during combustion. If the porting on them is as radical as the porting on the exhaust then I suspect that's where the burning is coming from.
I hate to be the bearer of bad news, but if it were mine I'd look into a new cylinder or getting that one resleeved.


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PostPosted: Mon Mar 07, 2005 4:39 am 
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Location: Chicago
His exhaust port is actually smaller than mine, I talked to some Engine building gurus and
they indicated the Engine probably needs more blowdown time area, I can see where I
could make the exhaust port larger or even match mine but the cylinder is on the last
bore, a new wiseco piston provides .006 clearance so he is looking for another cylinder.


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PostPosted: Mon Mar 07, 2005 2:39 pm 
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Joined: Sun Dec 28, 2003 10:38 pm
Posts: 228
Location: Knoxville, TN
oops, was transcribing the number wrong. my fault.


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PostPosted: Mon Mar 07, 2005 2:43 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22128
Location: Chicago
PilotHawK wrote:
oops, was transcribing the number wrong. my fault.


No problem, your comments got me thinking, I will see if I can find some graph
paper, make another impression and see just what the difference is between the
two, this might also help someone else in the future...


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