Even MORE Free Power For The Home Engine Builder

Backfacing valves is a tried and true method of increasing low lift flow. Here's an explanation of why it works and how you can do yours at home with no special tools...just a hand drill and a file.
#engineblueprinting #cylinderheads #enginebuilding
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[SmokeyRam]

"Think of me as the free horsepower fairy" that should be on a shirt lol

[jeniaa]

Uncle Tony. I asked that question in 1985. A retired Ford drivetrain engineer was teaching auto mechanics in the Air Force. I had already had years of training before that by my grandfather, who had been a master mechanic. The answer I got from the engineer, for the ridge on the back of the valve. Was to create turbulence. To help a cold engine atomise the fuel better.

[classicreaction]

I was the top cylinder head valve director for Chrysler from 1910 until 1998. The specific area of the valve you are referencing in this video was the direct culmination of many decades worth of atomization physics, combustion theory, and mathematical engineering. I spent my entire life perfecting what I named "The Intake Valve Ramp" to find the quintessential balance between power, drivabilty, mileage, and durability. It's purpose was to create a counterclockwise vortex that would, in turn, bring in a vacuum-induced pressure effect to amplify the sonoramic waves found in the atmospheric combustion during the mid-stroke. It took me literally years of frustrating trial and error testing to get it right. All of my blood, sweat, and tears went into the process. I spent countless nights rolling around, unable to sleep, obsessing about it. That little ridge cost me my wife, my family, and in the end, it cost me my sanity. And you just ground it off with a drill and a file.


And if you believe this story, I got some nice oceanfront property in Nashville for

[jeffperrault]

Just a thought Tony but SLAG HAMMER would fit right in with SOUTH EAST GASSER ASSOC.and low and behold you live right there!

[unclesquirrel]

I was always under the assumption that that ridge on the valve was another factory heat sink

[LetGaiaLive]

Tony, if you were to write a book on all the different ways of achieving free horsepower, I WOULD buy it!
Love your work 👍🇦🇺

[notthegovnkemp]

The ridge could benefit the mixture for fuel efficiency by causing a disruption in flow. Bad for power, good for fuel economy. It's always a trade off like some guy named Tony said on youtube

[Tumbleweed_Tx]

a power drill mounted in a vise is a lathe :)

[gregnelson]

I have been doing this since the 80s. On the exhaust I use a back cut that just blends the edge. Stock and super stock classes is where I find all the tricks of the trade. The single digit increases add up over time.

[hughobrien]

Been wondering about that same question for near 20 years. Just knew that a 30 degree back cut always helped.
That’s as good of an explanation or theory as I’ve ever heard ran up the flag pole. I’ll salute it.

[kcav]

I would've thought that little trough is there to help the air/fuel mixture bounce off the valve face to possibly give the fuel/air mixture a boost filling the cylinder head quench area.... As Dick Arons once said to me "a more complete filling of the cylinder head quench area." Or something to that effect...

[routtookc]

drill chucked into a vice...perfect for the home engine builder !!

[mrpanda_]

That drill in the vice has got to be the greatest thing I've ever seen. Nothing ever stops UT. If there's a will there's a way! Ingenuity at its finest!

[scottlundy]

That Tony just amazes me how he can come up with useful information day after day he is a true grey beard.

[jimjohnson]

Not sure anyone will even read this, but, it has been noted by some head porters that the ridge on the back of the exhaust valve helps prevent reversion. The intake valve is a different story of course in that it may hurt low lift and help at higher lift. Overall under the curve is helped.

[ronnieb]

I use a valve refacer tool for small engines that has a carbide cutter and the valve spins in a v block type vise jaws. Its made by Rotary, part num 750-257 and cost around 50 bucks. Then put in the drill press to clean it up with a right angle die grinder and a flap disc, lastly with scotchbrite disc . I've had machine shop guys ask me who did the work on the valves because they look like Ferrea valves but there OEM

[MrDibbons]

I had a set of original 2.08 intake valves from the 1962-1964 factory Maximum Wedge big blocks that were called "tulip" valves-very long sloped fillet/neck from the stem to the seat face. It looked like they would have weighed a ton. I found an NOS set for sale on Ebay at the moment.

[kerrymathers]

Tony the ridge on the valve is to create turbulence to keep air away from the walls at very low lift. The object is to keep the air near the center flowing at 300 ft/sec at low lift . This is known as "Vena Contracta".
Keep up the good more to playing with cars than simply throwing shiny parts at it.

[AaBb-zjld]

files are amazing tools for many purposes.

[mdcuddy]

Tony, I always had access to a Sioux valve grinder and my Neway valve seat kit. It made seating and grinding very easy. The last part of the head job was to grind the trough off on the grinder with the finest grit wheel after the seating was done. Great to see the old ways working again!