How To Measure Blow-By For Under $200

Рет қаралды 8,769

3 ай бұрын

In episode from the 2024 ‪@EnginePerformanceExpo‬ Lake Speed Jr and Ben Strader show two different tools for measuring blow-by, which is the ENEMY of your ENGINE, and as Ben always says, if you want to manage it, you first have to measure it.
Fortunately, ‪@EFIUniversity1‬ happened to have a Ford 7.3L Godzilla engine on the dyno, so let's see what kind of blow-by a factory built engine produces.
#engine #enginebuilding #horsepower #pistonring #Ford

Пікірлер: 43

@stuarthoffman5065 3 ай бұрын

I would love to know where to find the engine crankcase flow /pressure numbers. I have never seen them in publications.

@robertdouglas3456 3 ай бұрын

Excellent video Lake!💪🌄

@TotalSeal 3 ай бұрын

Thank you 🙌

@patrickharper9297 3 ай бұрын

another good and informative video

@TotalSeal 3 ай бұрын

Glad you enjoyed it

@catlinpondel2487 3 ай бұрын

What’s your thoughts on installing oil catch can on modern engines? I installed one on a 2022 Toyota Tundra. With 15k miles on it, I have collected and saved about 4oz of oil from being ingested by the engine. Makes me feels good that I did it! Thank you for doing these videos, and sharing your knowledge! 👍🏼

@TotalSeal 3 ай бұрын

Good idea!

@randywl8925 3 ай бұрын

That's miniscule. I'm getting 2oz in 700 miles. ....Hey, almost 300,000 miles on my 4.3 V6 Compression is decent at around 147 to 160.

@randywl8925 3 ай бұрын

Is blowby 100% caused by ring seal? I get 2 ounces in my home brew oil catch can after 600 to 700 miles. Compression average is around 150. The valve guides are probably sloppy with 294,000+ miles on the odometer. The seals, nonexistent or turned to bakelite. I'm curious if the condition of my valve guides and seals have any role in blowby and also if they contribute to the oil mist making it to my catch can.

@ericrmk7608 3 ай бұрын

I believe the 'need' for a catch-can is also dictated by the type of oil and properties of that oil..... how much of your oil you loose from its relative volatility... What are your Noack numbers of your oil? Also... When you say 4oz of oil... is that only oil, or emulsified oil... and what component of your oil have you lost because of that volatility (evaporative loss) ?? @TotalSeal #TotalSeal

@catlinpondel2487 3 ай бұрын

@@ericrmk7608 It is dirty looking, and maybe even thinner than normal. Maybe even a little milky at times? I see what you are talking about. I guess I would have to test it to see.

@irawantanujaya 3 ай бұрын

The thinner piston ring design used by many modern engines today also increases the possibility of blow-by as well as the possibility of fuel dilution

@stuarthoffman5065 3 ай бұрын

Working on heavy duty diesel engines I measured crankcase pressure in inches water to help determine engine condition. What’s more important, pressure or flow understanding they are related to each other.

@strokie1000 3 ай бұрын

I use Total seal zero gap ,leakdown test = 1 to 2% blowby must be very low wish have the meter to know the cfm.

@klausvonschmit4722 3 ай бұрын

Part of my maintenance routine following a race is to leak down ole Penelope after I change the oil and run the valves to decide do I pickle her and back the rockers off or is it fresh up time? Now that the mutual BSing is over! Is there a way to utilize one’s leak percentages into CFM? Killer video!

@jdksynthetics 2 ай бұрын

I love oil, too!

@user-kw7zb8qw1u 3 ай бұрын

I just take the oil cap off 😅

@TotalSeal 3 ай бұрын

LOL

@robertdouglas3456 3 ай бұрын

It might get quite messy!🤩🤩

@darrenwilliamson7944 3 ай бұрын

How much blow by is too much on a m278 Benz v8 bi-turbo engine??🤔

@boostedthirdgenracing 3 ай бұрын

I noticed the blow by meter went up when you let off

@TotalSeal 3 ай бұрын

That’s created by the differential pressure caused by the manifold vacuum from closing the throttle.

@bicepusmaximus 3 ай бұрын

Where are you attaching it on your valve cover?

@TotalSeal 3 ай бұрын

That's the best place to connect since there is less splash going on versus the crankcase.

@Fix_It_Again_Tony 3 ай бұрын

It goes where ever the crankcase vent would go.

@devbropa-wy1xl 3 ай бұрын

That's the same thing use to test asthma stuff.

@FadetoBlack1463 3 ай бұрын

Would measuring crank case pressure provide similar results?

@TotalSeal 3 ай бұрын

Yes, it is another way of looking at the same thing.

@dan1906 3 ай бұрын

Not without a way to control or measure the gas escaping. Pressure will just build until it finds a way out. Your pressure measurement will only show how much pressure the crankcase can hold before leaking, not the volume of blow-by.

@FadetoBlack1463 3 ай бұрын

@@dan1906 Wouldnt that same theory apply to measuring blow by?

@dan1906 3 ай бұрын

@FadetoBlack1463 I'm not sure I understand your response. Blow-by is a measurement of volume, not pressure. Pressure is the containment of volume. Think about your tires. They hold air under pressure, but that is not an indication of how quickly it was inflated. Crankcase pressure is a measurement of now much it can hold before leaking, which isn't much. It will not show how much blow-by is occurring in real-time, hence the need for a flow meter, and why they use it.

@FadetoBlack1463 3 ай бұрын

@@dan1906 I see. Maybe that is a more accurate way to measure. I would think however if you has a base measured crankcase pressure and or vacuum and now you have an increase in pressure or reduced vacuum that would show degrading ring seal as well?

@johnnyhonda7576 3 ай бұрын

What number is too high on a N/A 500 Hp iron block and heads

@TotalSeal 3 ай бұрын

Over 5 CFM is not great. Over 8 is really bad.

@bcbloc02 3 ай бұрын

@@TotalSealwon’t the displacement of the engine have an effect on acceptable values? I would think a 20liter motor will pass a lot more cfm than a 2l while still being ok.

@stevensapyak7971 3 ай бұрын

4.6.24. 🤔Pressure Transducer calibrated to read SCFM❓

@marscruz 3 ай бұрын

Pressure is one thing. Flow volume (SCFM = standard cubic feet per minute) is another. Sure, they are related, but not the same thing. The device that Lake is holding with the ball and tube is called a rotometer. It measures the amount of gas flow per unit of time.