compression 11hp b&s

Posted by whitt on July 21, 2005, 11:01 am

wondering what the compression on a 11hp b&s is suppose to be?
It is a john deere riding mower but doesn't have much power when you
run the mower.
thanks

Posted by Ulysses on July 21, 2005, 6:23 pm

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I'm not sure about the bigger ones but on the small engines (3-5 HP) they
don't give a specific compression--if the compression is enough to blow your
thumb out of the spark plug hole then it's enough to run the engine. Pretty
sophicated huh?

Posted by ds549 on July 22, 2005, 12:25 am

60-80lbs one will run. 100-125 is very good.

Posted by Duane Bozarth on July 22, 2005, 10:12 am

whitt wrote:
show/hide quoted text
In general you can figure a compression ratio of from 7 to 9 for a
gasoline engine which is roughly 100 - 135 psi. For small engines the
lower end is more typical. As someone else I think noted, they'll run
down to about 60-80 psi, obviously losing power as there's lower
compression.

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