RC51 Track Bike Project
03-03-2011 | 09:09 AM
#124
Thread Starter
Senior Member
SuperBike
Joined: Dec 2005
Posts: 1,689
From: South Lake Tahoe, CA, USA
I got a little too carried away with polishing the ports, because it helped me to visualize the port shapes. I think I need to go back in and put some surface roughness on the port walls to keep the fuel suspended on the intake ports and encourage some carbon deposit on the exhaust ports, for insulation.It's good practice.
I have a very low mileage engine, that I bought for $250. The poor thing must have been crashed in the first few weeks of ownership. It will be the core for my next engine project.
I have a very low mileage engine, that I bought for $250. The poor thing must have been crashed in the first few weeks of ownership. It will be the core for my next engine project.
03-03-2011 | 09:13 AM
#125
Fastest Color
SuperBike
Joined: Jul 2007
Posts: 2,091
From: Lithia, FL
I got a little too carried away with polishing the ports, because it helped me to visualize the port shapes. I think I need to go back in and put some surface roughness on the port walls to keep the fuel suspended on the intake ports and encourage some carbon deposit on the exhaust ports, for insulation.It's good practice.
I have a very low mileage engine, that I bought for $250. The poor thing must have been crashed in the first few weeks of ownership. It will be the core for my next engine project.
I have a very low mileage engine, that I bought for $250. The poor thing must have been crashed in the first few weeks of ownership. It will be the core for my next engine project.
03-03-2011 | 09:44 AM
#126
Thread Starter
Senior Member
SuperBike
Joined: Dec 2005
Posts: 1,689
From: South Lake Tahoe, CA, USA
Yeah, I can't pretend to have a need for more power. I wouldn't say it's scary fast, but much of the time, I don't need to run it wide open, like I would on a 600. Look at the video of Dave Stanton at Thunderhill that 8541Hawk posted and he runs at part throttle much of the time, as well.
But you are right. Much of the impetus for the project is the satisfaction that comes from doing the work. I'm building a full stage II engine, complete with Moriwaki airbox and intake snorkel. I'm installing a set of Kent billet cams. Compression ratio will be lower than I would have expected, for several reasons, based upon what I have learned from RD. It mainly has to do with propagation of the flame front on big, slow pistons and the path between intake and exhaust valves during the overlap period.
When he sent me cam timing info, with recommendations for road races like the IoM-TT, I knew I was in to something serious.
Now, if I can just stop being such a wuss, and get the damn bike off the corners, I'll have something.
But you are right. Much of the impetus for the project is the satisfaction that comes from doing the work. I'm building a full stage II engine, complete with Moriwaki airbox and intake snorkel. I'm installing a set of Kent billet cams. Compression ratio will be lower than I would have expected, for several reasons, based upon what I have learned from RD. It mainly has to do with propagation of the flame front on big, slow pistons and the path between intake and exhaust valves during the overlap period.
When he sent me cam timing info, with recommendations for road races like the IoM-TT, I knew I was in to something serious.
Now, if I can just stop being such a wuss, and get the damn bike off the corners, I'll have something.
03-03-2011 | 09:58 AM
#127
Fastest Color
SuperBike
Joined: Jul 2007
Posts: 2,091
From: Lithia, FL
Yeah, I can't pretend to have a need for more power. I wouldn't say it's scary fast, but much of the time, I don't need to run it wide open, like I would on a 600. Look at the video of Dave Stanton at Thunderhill that 8541Hawk posted and he runs at part throttle much of the time, as well.
But you are right. Much of the impetus for the project is the satisfaction that comes from doing the work. I'm building a full stage II engine, complete with Moriwaki airbox and intake snorkel. I'm installing a set of Kent billet cams. Compression ratio will be lower than I would have expected, for several reasons, based upon what I have learned from RD. It mainly has to do with propagation of the flame front on big, slow pistons and the path between intake and exhaust valves during the overlap period.
When he sent me cam timing info, with recommendations for road races like the IoM-TT, I knew I was in to something serious.
Now, if I can just stop being such a wuss, and get the damn bike off the corners, I'll have something.
But you are right. Much of the impetus for the project is the satisfaction that comes from doing the work. I'm building a full stage II engine, complete with Moriwaki airbox and intake snorkel. I'm installing a set of Kent billet cams. Compression ratio will be lower than I would have expected, for several reasons, based upon what I have learned from RD. It mainly has to do with propagation of the flame front on big, slow pistons and the path between intake and exhaust valves during the overlap period.
When he sent me cam timing info, with recommendations for road races like the IoM-TT, I knew I was in to something serious.
Now, if I can just stop being such a wuss, and get the damn bike off the corners, I'll have something.
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