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valve to cylinder angle

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HDMac

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Posts: 102

Joined: Sat Feb 05, 2005 1:01 am

Location: Switzerland

Post Sun Jan 26, 2014 8:25 am

valve to cylinder angle

Hey,
Does anyone know the angle that the valves are tilted compared to the cylinder axes (in the front cylinder the valves are tilted backwards and in the rear cylinder thy are tilted forward. I tried to measure the angle on a factory blueprint and came up with roughly 4.35 deg. when I try to measure on a real cylinder I get something around 3.5 deg. Is this angle the same for WL, UL and WR cylinders (I know that the valves on WR cylinders are tilted towards the piston perpendicular to the longitudinal axis of the bike as well)?
Thanks,
Mac
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FHP-Eric

Posts: 19

Joined: Mon Sep 27, 2010 12:59 pm

Post Mon Feb 10, 2014 10:04 am

Re: valve to cylinder angle

The UL valves are at 4.5 degrees.
Eric
S&S Cycle, Vintage Lead (formerly Flathead Power)
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HDMac

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Posts: 102

Joined: Sat Feb 05, 2005 1:01 am

Location: Switzerland

Post Mon Feb 10, 2014 11:41 am

Re: valve to cylinder angle

Thanks Eric,
From the drawings I have, it seems that the WL are the same. WR cylinders might be different. I measured the front and rear intake valve on my WR cylinders and found 3.5° and 3.7° respectively. Since I only had to fix the hole of the intake valve guide, I did not measure the exhaust valve angles but looking at the two valves it might be even different. Maybe exhausts are 4,5° and intakes 3.5°?? They look weird anyway because the angles toward the cylinders are different for intake and exhaust as well (1.033° and 3.533°).

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