Posted April 04, 2012 - 11:16 AM
Posted April 05, 2012 - 10:43 AM
Posted April 05, 2012 - 01:02 PM
Posted April 05, 2012 - 05:33 PM
I am not familiar with the Fb23 engine designation as you posted.
Is this a Model FB with the overhead valves, or a Model 23FB with the valves in the block (flathead)?
B&S never published compression pressures for their older engines (I doubt they do it now either).
Many of their engines had "compression relief" ground into the camshaft profile, so that when cranking the engine, cylinder pressure would bleed off to make starting easier. ....Once the engine was running, the loss of compression at speed was insignificant.
The method recommended by B&S to check for adequate compression is to spin the engine counterclockwise (flywheel side) against the compression stroke. ....If compression is adequate, the flywheel should "bounce back" in a clockwise direction. ....Slight or no "bounce back" indicates low compression.
Posted April 05, 2012 - 06:44 PM
Posted April 05, 2012 - 07:00 PM
Posted April 06, 2012 - 06:09 PM
Posted April 06, 2012 - 09:13 PM