Topic: CB350F/400F stock cam lift values

[Smithy]

Hi Guys,
I've spent a few nights searching for valve lift specs for stock cam but found nothing.
My CB350F cam measure a lift of around 0.216" with the rocker arm ration close to 1:1 mean a valve lift of only 0.216" is this correct?
Web or Mega cycles start with 0.333" valve lift. That's nearly 120" more (3mm) and uses stock springs.
I'm going to get my cam ground and need to know if my original lift figures are correct.

[bwaller]

I measured the 500/550/650 rockers for a ratio of 1.08:1. I believe all the SOHC 4's must be the same. If you put your cam in the valve cover upside down and install a dial indicator on the adjuster screw (at about the same angle) just rotate the cam for the lift figure.

[Tim2005]

I think all the specs you need are archived on this page here, which was done by a guy called Jeff Chenevert a few years ago

http://web.archive.org/web/20100422072747/http://cafe400f.cloud.prohosting.com/html/CB400f_Cam_Comparison.htm

[Smithy]

Thanks guys,
I can see from the link where the problem is.
The cam lift is 0.215 and rocher ration is 1.08-1.1.
BUT the cam specs listed use an estimated rocker arm ratio of 1:1.4-1.5 giving false valve lift figures.

[bwaller]

I haven't checked the 400 rockers, only assumed they'd match the other 4's. If you're right the chart is flawed, too bad. The only cams using a 0.050" checking height would be the three Web cams, the rest would be @0.040", not comparable numbers, again too bad. I also don't agree with the 29-32% ratio of lift/valve diameter. Methinks 35% is ideal.

The chart's a great idea but I think I could only trust one person doing the testing, unfortunately there aren't many people trying so many different cams.