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1930s-40s Briggs engines


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  #1  
Old 12-14-2018, 08:50:52 PM
Briggsguy615 Briggsguy615 is offline
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Default 1930s-40s Briggs engines

Hello I am new to this group, I am glad to find a place to answer questions,

What the compression on a 1935 model y Briggs? Kinda hard to find the correct info! Thanks
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  #2  
Old 12-15-2018, 12:31:57 AM
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ulgydog56 ulgydog56 is offline
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Default Re: 1930s-40s Briggs engines

I betting around 5 and a haft to 6 to 1. low compression in the old days..
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Old 12-15-2018, 01:31:21 PM
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Default Re: 1930s-40s Briggs engines

There is no compression specs. Flip the flywheel and if it bounces back against compression it will run.
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Old 12-15-2018, 03:05:54 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: 1930s-40s Briggs engines

If you try to use a compression gage, you need about 10 compression strokes with a rope start engine, and even that won't give you a perfect reading. If you belt the engine up to an electric motor, then you will get a close idea. Throttle wide open for the test. You should get in the area of 50-60 PSI with the motor. 30 - 50 with the rope start. More is better. As Turbo stated, the best test is to try and start the engine. if after the rope comes off, the engine bounces back against the compression stroke, it should have enough to run. If it just mushes to a stop, then you need to do a leak down test to see where the compression is going. You make an adapter to put air into the spark plug hole, put the engine at TDC Compression, put 80 + PSI air to the combustion chamber and listen for where the air comes out. Intake or exhaust - needs valve clearancing or lapping in. If air comes out the valve chamber vent - rings / cylinder condition need to be looked at.
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Old 12-16-2018, 03:00:37 PM
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Craig A Craig A is offline
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Default Re: 1930s-40s Briggs engines

Welcome to STAK...…..
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Old 12-16-2018, 07:57:43 PM
Ken Karrow Ken Karrow is online now
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Default Re: 1930s-40s Briggs engines

If you pressurized the combustion chamber at TDC be SURE the engine can NOT turn. At 80 psi with 2" bore you have 300+ # of pressure on top of piston and engine will turn with vigor. You ain't going to hold it by hand or wrench on flywheel nut. Also it can turn either direction. Don't ask how I know.
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Old 12-16-2018, 09:02:41 PM
FlJim FlJim is offline
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Talking Re: 1930s-40s Briggs engines

Amen to making sure engine can't turn. And you can't hold it with your hand. I also learned the hard way.
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