Exaust Back Pressure Test

[@mikakarki7989]

Internal combustion engines don't need flippin' backpressure to anything. It's "a poor man's EGR" a.k.a. exhaust gas, which remains in the cylinder after exhaust valve is closed. It raises the combustion temperature in the cylinder making engine more prone to knocking and it takes away volume from a incoming fresh A/F mixture ... smaller bang, less power. Period!. On turbocharged engine it's a different ball game. In that case it's called a TDP ... Turbine Drive Pressure and a certain amount of it is needed to make a bigger bang = more power. 😇

[@reynaldoclaveria100]

excellent video very interesting I gained knowledge.thanks a lot sir.

[@toltec13]

Does the card test also indicate a bad catty converter song with a pressure test? I realize the tapping sound from the card indicated misfiring, but I'm puzzled about the tapping card and restricted exhaust pressure.

[@SamRoxxJDM]

tap your cat with a rubber hammer, if you hear a rattling your cat is bad......the card test shows a misfire in the engine, but any restriction in exhaust will show the same

[@mdscownz]

Why would a 4 stroke engine benefit from back pressure? An engines just an air pump. How can any restrictions from intake or exhaust make it more efficient?

[@wingman4435]

The engine tune relies on some degree of back pressure to push against in order to balance the gas pressure in the engine and maximise power and torque.

[@urassisdragon]

Very interesting! Nice video!

[@mikmik-g8f]

good day, sir. May I ask what type of back pressure gauge you are using? and what type of unit of measurement is that? Is it PSI or kpa? Im not sure and I am learning. I hope you will read this and answer my questions. Thank you so much.

[@georgeh1352]

PSI

[@sheerwillsurvival2064]

Excellent video

[@Squirrel-Chaser]

Is there a way to test a muffler when it's off rhe car? The cat failed on my 2018 Hyundai, but im also noticing exhaust leak marks out of the connection point where the muffler connects to the center muffler assembly. Should i just just install the new cat/center assembly, leaving the muffler disconnected, test, then reattach the muffler and see how the car performs?

[@johnshaw5001]

Your demonstration has nothing to do with back pressure. What does a misfire have to do with an exhaust restriction?

[@johnpaulgarrett1]

Great info. Thank You Very Much.

[@parvariramin]

‏Thanks for the great video, I put a gasket on the connection between the muffler and the exhaust pipe for a better sound. It can be said that this part of the exhaust is leaking now, will it damage the car engine in the long run or not?