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Question by  Snow4Life (49)

What is the normal compression for a 12 hp Briggs and Stratton engine?

I need to lean more about Briggs and Stratton engines.


Answer by  digmyspace (249)

The Briggs and Stratton website has a lot of tech info on what is recommended and stock settings, etc. You could check it out to get more info.


Answer by  mb (5482)

You can expect a normal operating pressure of 10 PSI (pounds per square inch) per unit of horsepower. So aprox 120 PSI.


Answer by  icyblue (236)

I have a 7HP Briggs engine and it gives a compression of 90 pounds. This is barely enough. My friend told me it needs to be higher. Your engine has 12 HP so you can do the math!


Answer by  kitty74 (6)

A fully serviced engine should deliver a compression of between 75 and 80 p.s.i. Allthough, unless it is below 55 p.s.i there probably is nothing to worry about. As the piston rings wear over time they compression will reduce.


Answer by  Jamie0108 (61)

The normal compression rate for a 12HP engine from Briggs and Stratton is 20 to 30 PSI. This is ideal for this type of engine. Making the PSI go anywhere from 40 to 55 or higher will result in a major malfunction with the enginge or blow up of the engine which means you would have to replace.


Answer by  theblip (295)

The proper way to check for compression is with a leak down test. But this requires special stuff and equipment. How much compression are you getting and how did you check your 12 hp Briggs and Stratton engine?

Reply by addicted (186):
Get your valves checked - it's easier than actually checking the compression. If it's dirty or clogged clean them and see if the engine works better. May save you some time.  add a comment

Answer by  HUNM25 (713)

The normal operating compression is usually 110 to 120 psi. You can usually just multiply the HP by the number 10 to get a general standard compression for any sort of engine. So yeah, if you want more information you can also go on their engine website to see about details.


Answer by  Jalaine11 (2043)

If you want to learn more about your Briggs and Stratton engine you might try checking your user manual or their website. Try their FAQ section.

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