Multi-Angle Valve Job for High Performance

Рет қаралды 6,210

3 жыл бұрын

Smitty describes the aerodynamic benefits of multi-angle valve jobs, increasing airflow and therefore horsepower by simply "knockin' off some corners."

Пікірлер: 21

@crazyDIYguy 2 ай бұрын

I love that i found this channel, it's so hard to find people that actually know the logic behind performance. Thank you 🙏💯

@georgedreisch2662 10 ай бұрын

While you covered the 15 degree incremental changes in angle to maintain laminar flow over the valve seat and face, you didn’t mention that the 15 degree changes in angle function to provide vaporization ridges, to provide additional fuel - air atomization, and is why radius cuts are not typically used. It’s always left me going huh?, for how much OEM’s leave on the table, for lack of attention to details, for gains in reduced emissions, increased mileage, as well as performance.

@redbaronlsr2107b 4 ай бұрын

That's a nice addition! It's a "Goldilocks challenge" to have good turbulence for atomization, but not so much turbulence that the flow into the cylinder is compromised.

@jordanbuscema2719 4 ай бұрын

just got the multi angle job done looking forward to try it out

@archimedesCNC 3 жыл бұрын

David Vizard would be proud. nicely explained & these efforts are much appreciated.

@ThirteenTwentyRepair 7 ай бұрын

That makes me wonder if the OEM “tumble” helps atomization in a stock application where they are more concerned with emissions than performance.

@johnmoore9588 4 ай бұрын

What makes for good performance with valves usually makes for good fuel economy too. It’s just cheaper to machine oem stuff the way they do

@redbaronlsr2107b 4 ай бұрын

Well said. The tumble and atomization create a good mixture that achieves a faster burn rate (good for performance & efficiency). The biggest factor for us, as a supercharged engine, is getting maximum flow rate through the valves.

@cameronscruisers4518 Жыл бұрын

Thank you a ton

@user-david6265 5 ай бұрын

My 283 has a 3 angle valve job ❤

@joshuachandra6677 Жыл бұрын

This is good stuff right here

@jesseduke694 Жыл бұрын

I like this! Is there more were this came from?

@redbaronlsr2107b Жыл бұрын

Thanks for the encouragement! We have a few ideas for the next set of videos... Been working on our motorcycle lately.

@jamesfontana748 3 ай бұрын

Not to much back cut on exaust valve, it can cause inversion.

@Paul-bo6zu 2 жыл бұрын

Interesting, I have always done the seat, doing the face can be very tricky

@redbaronlsr2107b Жыл бұрын

Agreed. To be more specific, the *seats* may have 3+ angles, but valve face is usually 2 angles, one being the angle of the valve face contact area, and the second being the backcut angle up to the stem. There's some good pictures and data at johnmaherracing.com/tech-talk/3-angle-valve-job/

@tadeckel5053 3 ай бұрын

How about an interferance angle. 1 degree difference between valve sealing seat and seat? Get a better seal.

@redbaronlsr2107b 2 ай бұрын

Interesting idea! This sounds like it would reduce the concentric contact area between the valve and seat. That contact area is a critical thermal path, especially for the exhaust valve, so the valve could run hot. It may be pounded into submission to match the angle of the seat over time.