Porting cylinder heads
07-23-2010, 12:38 PM
#2
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MotoGP
Join Date: Aug 2007
Location: Lake View Terrace, CA
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Search really is your friend...... Sorry Tweety, you're getting slow these days.....lol
But as I happen to have just happened to have looked up the info myself..... here is what you want to do.....
"For the street, the port work should focus on a few things. Do not make major changes to the port area, work on blending the bowls, slight flattening of the port floor around the short radius of each port, matching the carb manifold spigots, and to a good 3 angle valve job. The valve seats should be moved to the outer perimeter of the valves without going all the way to the edge. Total seat contact width should be about 50% of the overall face area."
As found here:
https://www.superhawkforum.com/forum...0&postcount=19
As to where you have it done that is up to you to find.
But as I happen to have just happened to have looked up the info myself..... here is what you want to do.....
"For the street, the port work should focus on a few things. Do not make major changes to the port area, work on blending the bowls, slight flattening of the port floor around the short radius of each port, matching the carb manifold spigots, and to a good 3 angle valve job. The valve seats should be moved to the outer perimeter of the valves without going all the way to the edge. Total seat contact width should be about 50% of the overall face area."
As found here:
https://www.superhawkforum.com/forum...0&postcount=19
As to where you have it done that is up to you to find.
07-23-2010, 02:07 PM
#3
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SuperSport
Thread Starter
Join Date: Mar 2010
Location: Asheville, North Carolina
Posts: 949
Thank you for the info, I have a couple of spare sets, Yet these stock heads/ low milage are not that easy to come by. Any suggestion or recommendation on a shop, or member that would be more experienced in the operation ?
07-28-2010, 12:25 PM
#4
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Join Date: Jun 2010
Posts: 228
Ported and Polished Superhawk Heads
these heads have been ported, polished exhaust port, polished combustion chamber, full radius valve job w/undercut, milled .010" off of the head surface, used with stock valves and Kibblewhite racing springs and moriwaki cams
07-28-2010, 12:43 PM
#5
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MotoGP
Join Date: Aug 2007
Location: Lake View Terrace, CA
Posts: 5,942
The specs listed in my previous post are straight from Moriwaki and work very well unless you are building a full race motor. In that case you have no worries about the lower RPM range. But as always YMMV.
07-29-2010, 08:25 AM
#7
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SuperBike
Join Date: Dec 2005
Location: South Lake Tahoe, CA, USA
Posts: 1,689
That's the first time I've seen a dimpled intake port. I have heard about it and that it flows very well.
Oversized valves are a good idea. And I'm in the 3-angle valve job camp. I like to have some surface area for the valve face contact - more for the exhaust valves, becuase the valve spends most of it's time closed and the valve contact with the seat is critical for keeping the valves cool.
Otherwise, it looks very good.
Oversized valves are a good idea. And I'm in the 3-angle valve job camp. I like to have some surface area for the valve face contact - more for the exhaust valves, becuase the valve spends most of it's time closed and the valve contact with the seat is critical for keeping the valves cool.
Otherwise, it looks very good.
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