nerobro
09-13-2005, 04:10 AM
It's been done.
Skreemer and I have made the GS650 head, block, and pistons fit on a GS550 crank and block.
There's a lot more involved than originally thought.
First, the block wouldn't fit down into the crankcase. The cylinder liners don't actually touch down in thecrankcase so it was a matter of trial and error to find out where the interferece was.
http://zodnetworks.com/~nerobro/Nerobro/DSC00880.JPG
As you can see... some of the interference was pretty severe.
http://zodnetworks.com/~nerobro/Nerobro/DSC00883.JPG
Look carefully and you can see where we ground casting flash off of the inside of bore 2, and Skreemer is working on bore 3
http://zodnetworks.com/~nerobro/Nerobro/DSC00881.JPG
Super Scary... Skreemer with a dremmel. He's not quite the artist as I, but he's competant :-) And look... I let him inside my engine with that thing.
It involved a LOT of grinding. none of it was all that deep, just a lot of it. If I did it again, I'd split the cases, pull the headstuds, and have a machine shop bore the crankcase. But that was well beyond my budget ;-)
http://zodnetworks.com/~nerobro/Nerobro/DSC00882.JPG
Testfitting. This was probally our 4th or 5th fitting of the block.
http://zodnetworks.com/~nerobro/Nerobro/DSC00885.JPG
This is one of our last goes at making clearance. An artist at work... you can't see the work. ;-)
Seccond, much to our chagrin, the headgasket is different on the 650 and 550. so I had to reuse the 650 headgasket. I will be buying 650 headgaskets from here on out. Here's the reason why... The 550 uses an o-ring to seal the chaincase. The 650 just uses the soft fiber gasket. the 650 headgasket also has integrated oil gallery seals. The 550 uses seperate seals.
http://zodnetworks.com/~nerobro/Nerobro/DSC00889.JPG
Skreemer and I have made the GS650 head, block, and pistons fit on a GS550 crank and block.
There's a lot more involved than originally thought.
First, the block wouldn't fit down into the crankcase. The cylinder liners don't actually touch down in thecrankcase so it was a matter of trial and error to find out where the interferece was.
http://zodnetworks.com/~nerobro/Nerobro/DSC00880.JPG
As you can see... some of the interference was pretty severe.
http://zodnetworks.com/~nerobro/Nerobro/DSC00883.JPG
Look carefully and you can see where we ground casting flash off of the inside of bore 2, and Skreemer is working on bore 3
http://zodnetworks.com/~nerobro/Nerobro/DSC00881.JPG
Super Scary... Skreemer with a dremmel. He's not quite the artist as I, but he's competant :-) And look... I let him inside my engine with that thing.
It involved a LOT of grinding. none of it was all that deep, just a lot of it. If I did it again, I'd split the cases, pull the headstuds, and have a machine shop bore the crankcase. But that was well beyond my budget ;-)
http://zodnetworks.com/~nerobro/Nerobro/DSC00882.JPG
Testfitting. This was probally our 4th or 5th fitting of the block.
http://zodnetworks.com/~nerobro/Nerobro/DSC00885.JPG
This is one of our last goes at making clearance. An artist at work... you can't see the work. ;-)
Seccond, much to our chagrin, the headgasket is different on the 650 and 550. so I had to reuse the 650 headgasket. I will be buying 650 headgaskets from here on out. Here's the reason why... The 550 uses an o-ring to seal the chaincase. The 650 just uses the soft fiber gasket. the 650 headgasket also has integrated oil gallery seals. The 550 uses seperate seals.
http://zodnetworks.com/~nerobro/Nerobro/DSC00889.JPG