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Mar 11th, 2023
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Joined: Nov 2008
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Britbike forum member
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OP
Britbike forum member
Joined: Nov 2008
Posts: 3,849 Likes: 84 |
What would be the advantage of converting to the "skinny" valve stems and "beehive" springs?
1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
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Joined: Dec 2013
Posts: 6,793 Likes: 397
DOPE
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DOPE
Joined: Dec 2013
Posts: 6,793 Likes: 397 |
skinny valve stems obscure less of the port.
beehives are said to hold tension longer and have less weight up at the collars. i have a head with beehives but i havent run it enough to have a valid opinion
watermelons, and turnips, and a contaminator
and other stuff
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Joined: Jan 2006
Posts: 2,502 Likes: 127
Britbike forum member
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Britbike forum member
Joined: Jan 2006
Posts: 2,502 Likes: 127 |
What Kev said.
I have that setup on my 650 race bike. 3rd season on them. Had a bad initial experience where a valve contacted a piston at speed. Didnāt end well. We upped the spring pressure to about 90 lbs and itās been good since. Also increased v/p clearance from .060 to .090. Does it make more power than stock? Probably a little.
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Joined: Oct 2012
Posts: 6,562 Likes: 369
In remembrance
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In remembrance
Joined: Oct 2012
Posts: 6,562 Likes: 369 |
My double engine Triumph has beehive springs and 6mm intakesā¦.Supposedly the beehive also offers better valve control with less pressureā¦Set up at 85 pounds closed and 205 at .415 valve lift, engines have seen 7200 rpmā¦But Mike had a difference experienceā¦.I do know that the 6mm intakes bend like they are made from wax from contact with the TDC stop toolā¦ouchā¦
For a street engine? Probably no advantageā¦
61 hot rod A10, 89 Honda 650NT .On a bike you can out run the demons
"I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"
ā
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pushrod tom |
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