[SEL] Re: Briggs Question

[Bill Dickerson]

Mechanical compression release works as a weight on the cam gear, it
operates a lever that is embedded in the cam lobe - gives the valve some
lift where there would normally be none.
As the engine speeds up, the weight moves outward, pulling the lever in and
letting the valve operate as normal.
B&S more commonly used a special cam grind to accomplish similar on their
small aluminum engines. Yes, the exhaust valve was lifted ever-so-slightly
to relieve some compression on the compression stroke. The idea was that as
the engine sped up, this would have little impact on the running and power
of the engine. Well, their engines always seemed to have enough power for
me.

Have you noticed that it now takes a 4.5 or 5hp engine to run the same
rotary lawn mower that we used to run with a 3 or 3.5 hp engine? 
Thank your government and blade speed limits for that............

Bill

-----Original Message-----
From: sel-bounces at lists.stationary-engine.com
[mailto:sel-bounces at lists.stationary-engine.com] On Behalf Of jlb94 at juno.com
Sent: Thursday, June 03, 2004 9:11 AM
To: SEL at lists.stationary-engine.com
Subject: [SEL] Re: Briggs Question


Thanks to all (Roger - Ron - Bill B. - Bill D.) for answering my question on
adjusting the Briggs valves.

This is one of the engines I picked up from an old fellow in a neighboring
borough. He needed to make space and gave me 8 small engines and this
Roto-Tiller. I got 2 Sears Square Base Briggs running and a model 8 that I
sold. There was also a 1936 Briggs Model "B" that I sold.  
This is the last of the engines (Roto-Tiller) and I think there's hope for
it.

I figured I'd have to grind recalling posts from the past.

I am a little hesitant to start grinding as the engine had run (according to
the carbon) before.  But I couldn't find any adjustment.  And, cannot
imagine how the valve would "grow" - Unless the seat wore down.   I have
a couple spare valves from junkers.
I'll try to see if one of those fits any better.

I had a 1936 Model "B" - with crank - that had a compression release like
Bill B. mentioned - and - looked for something that might serve the same
purpose but couldn't find any.  Anyway, a compression release usually works
on the exhaust valve, not the intake valve - Right ?  

This is a small 3HP & I don't THINK it would have a compression release.
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