Engine Technology

G-Man · Post by **G-Man** » Wed Aug 19, 2015 6:47 am

Well put-together articles on controlling valves and how things have developed over the years. Presented as a pursuit of higher revs but relevant to make an 'ordinary' engine run with lower stress, too.....

G

http://www.cycleworld.com/2013/12/24/va ... n-cameron/

honda brian · Post by **honda brian** » Mon Aug 31, 2015 6:26 pm

Very interesting Graham. Kevin Cameron has three excellent books about racing and old school tuning. I can recommend them. Loving your restoration thread.
Brian.

OldScrambler · Post by **OldScrambler** » Wed Sep 02, 2015 4:51 pm

Beehive springs and much lighter valve components in my CB750

Steverino · Post by **Steverino** » Wed Sep 02, 2015 6:42 pm

Very interesting. I learned a thing or two. I thought the inner valve springs were for added pressure to keep the valves from floating. Pretty obvious I have no formal training. Hey Old Scrambler here is my CB750. I ride it whenever weather permits. It's never been apart and has 8000 miles on it. The more I ride it the better it runs. I am quite often approached by guys my age and older that want a closer look.

cb750right by Steve Steverinomeister, on Flickr

OldScrambler · Post by **OldScrambler** » Fri Sep 04, 2015 12:45 pm

Nice K6...........their only original ONCE! I ride my original K3 somewhat sparingly, but it did make a few recent miles in Idaho, Utah, Nevada and New Mexico.

I have same ID on sohc4.net...................lots of info and interest on all things SOHC-4

My CB750 build is on the high-performance page under Classic Bonneville Racer

I am building a CL77 motor to use in a custom dual-sport build. It will have the 3mm-oversize pistons and thinking about experimenting with modern valve components...........although mildly porting the intakes on the head may be all I need.

G-Man · Post by **G-Man** » Fri Sep 04, 2015 1:28 pm

Great picture, thanks. I have wondered about those springs.

G

OldScrambler wrote:Beehive springs and much lighter valve components in my CB750

G-Man · Post by **G-Man** » Fri Sep 04, 2015 1:32 pm

Steve

The inner springs don't do much, tension-wise as they are much smaller. They do however act as a friction surge damper for the otters at high revs. Notice how they are wound in the opposite direction so they don't snag the outers.

G

Steverino wrote:Very interesting. I learned a thing or two. I thought the inner valve springs were for added pressure to keep the valves from floating. Pretty obvious I have no formal training. Hey Old Scrambler here is my CB750. I ride it whenever weather permits. It's never been apart and has 8000 miles on it. The more I ride it the better it runs. I am quite often approached by guys my age and older that want a closer look.

cb750right by Steve Steverinomeister, on Flickr