Valve angle
#1
Three Wheelin'
Thread Starter
Join Date: Sep 2003
Location: SF Bay Area
Posts: 1,526
Likes: 0
Received 0 Likes
on
0 Posts
Valve angle
The angle on the valve and seat on the 928 is 45 degrees. I have been reading a bit on performance and longevity issues and there are some recommending a 46 degree angle on the valve seat and a 45 degree angle on the valve. This is supposed to reduce the surface area and reduce heat on the valve. I could see this on intake valves as they do not get as hot, but I would think one would need more surface contact on exhaust valves to cool them.
Any input on this? Unless there was a good case to be made I am not sure I am up to trying this on a 928, but I am wondering if anyone has considered it.
Any input on this? Unless there was a good case to be made I am not sure I am up to trying this on a 928, but I am wondering if anyone has considered it.
#3
Three Wheelin'
Thread Starter
Join Date: Sep 2003
Location: SF Bay Area
Posts: 1,526
Likes: 0
Received 0 Likes
on
0 Posts
I see nothing in the manual - both the valves and valve seats are at 45 degrees. I am more curious if anyone has tried changing the angle on the 928.
Another issue is lapping. When I talked to the people who sell cutters they did not advise lapping. I am curious if lapping is no longer considered valuable.
Another issue is lapping. When I talked to the people who sell cutters they did not advise lapping. I am curious if lapping is no longer considered valuable.