ibe_waiting
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I have a 5 hsp briggs,what should the compression be for it too run good?
compression question
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Russ2251
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There are no definitive numbers.
Briggs requires a leak down test.
If by spinning the flywheel against the compression stroke and it bounces back, it is considered acceptable.
Briggs requires a leak down test.
If by spinning the flywheel against the compression stroke and it bounces back, it is considered acceptable.
karl
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Do what russ says, if you got a tester if it is below 40psi I think it will not run. 100psi+ is good, 80psi is getting low, might burn oil or dilute oil from blowby.
B man
Tecumseh FTW!
well stock is etheir 206cc or 194cc.
karl
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What does that have to do with anything? 206cc tho.
B man
Tecumseh FTW!
well it would likely be 160cc or above to run good.
Russ2251
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Please explain.
B man
Tecumseh FTW!
well if the motor is 206cc. and it looses more than 46cc then something must be wrong. and with 46cc lost it cant run great.
ibe_waiting
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Whats cc got to do with compression, Ive got 60 pounds of compression and no spark. I was just wondering if a briggs with 60 lbs is worth buying a new magnito, thats all!
Doc Sprocket
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Bman, you are a little confused. Engine displacement (CC or CID) has absolutely nothing to do with compression, which is measured in PSI. You cannot "lose" displacement.
Doc Sprocket
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Repeat your compression test, this time spinning the crank backwards- this defeats the compression relief mechanism designed to give easier starts- it will give you a much more accurate reading.
Russ2251
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You're good to go. It will run OK with half of that.
karl
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Yep, it is probably a cool bore engine, there disposable. You cant bore of hone them.
ibe_waiting
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thanks everyone for all the input!
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