Cylinder Head 201 - Radius Cut Valve Job
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- čas přidán 3. 06. 2013
- This video covers the complete valve job process that your machinist might perform. If the 100 series videos didn't help you identify and correct a problem with your cylinder head, then this is the next step. This video is brought to you with permission from my machinist in full 1080HD, and covers cleaning up the head inside and out, preparation and setting up a radius cutter, cutting all 16 valve seats, valve grinding, and spans 3.5 hours of actual work in under 30 minutes. There's nothing like this anywhere else on CZcams.
THANK YOU BALLOS PRECISION MACHINE. Thank you for the professional explanation and execution of a job excellently-done, and un-precedented access to your facilities.
A valve job is done by re-grinding or replacing valves, and then having new seats cut to match the faces of the valves you're using. There are several different machines that might be utilized to achieve this result, but the process is the same no matter how it's done. There are seat cutters that utilize cutting stones. There are valve seat cutters with 3 separate angles installed 120° out-of-phase, and there are single cutters with all 3 angles (radius cutter) that cut with one blade in one pass. The machine demonstrated here is a Sunnen VGS-20 Radius Cutter. This machine (now out of production) produces a gradual curved seat that's superior to the shape of a traditional 3-angle seat. While a radius cutter does contain the 30, 45 and 60 degree angles, it does so without leaving any sharp edges between their faces.
My valve selection includes Supertech 1mm oversized nitride-coated stainless steel undercut and back-cut intake valves, and 1mm oversized Inconel back-cut exhaust valves. Inconel is a high-temperature alloy utilized in marine and forced-induction performance engines that can handle more abuse than steel can without melting. The other characteristics of the valves which are discussed typically yield bigger gains in airflow than simply using a bigger hole and a bigger valve.
Why I did this to a perfectly-good cylinder head:
I changed cams. Because the valves were previously recessed during another valve job 9 years ago, my valve installed height was increased and this raised the operating positions of my rocker arms. My new camshaft selection dictates using the stock valve install height. The only solutions to this valve install height problem are to either replace the valve seats, or install oversized valves. I opted for the latter.
Takes a special kind of chilled out guy to go through that painstaking process with professionalism from start to finish. The gentleman there fit the bill perfectly.
almost 2 mill views and only 132k subs. he really does it for use. thanks man youve thought me a lot over the years even today. thank you
That machinist is an excellent teacher and communicator. His explanation is so precise and thorough. He should be teaching in a vocational college. What a Professional. I salute him.
I was a Sunnen salesman for 40 years. My hat is off your one of the few people that I have seen that runs the VGS20 correctly,
This video is ridiculously valuable. Thank you for making it and sharing it with us!
Thanks for this quality video, learned a lot (and with your other cylinder head 101 series, too). Cheers!
Man this is awesome. I love how much pride this guy takes from doing his job so well. Makes me want to become a machinist! It's awesome that they let you watch/film their work. Great stuff.
Made me understand the definition of multi angle valve job. Thanks.
Man, the camera work, the editing, the knowledge, the delivery. Great vid.
I love falling asleep to these technical videos... i’m not saying that they’re boring but your narration is just so soothing
This is just like I’m at work. Same exact machines. Both of em. Was cool to see the quirks of someone else do this !
Thank you so very much for this video I've been wanting to see this for so many years.. In my head I've been trying to figure out how they were able to perfectly align the machine for every brand and model of engines out there ! Thats awesome I want to quit my job and do that !
I'm not even much of a DSM fan, but I've pretty much watched all of your videos because of how informative they are. I learn MANY new things every time you post a new vid. Thank you, and keep up the great work!
Have a whole new respect for machinists, great video.
By far one of the best auto engine / mechanical videos Ive watched this year
Awesome video thank you. I've been tuning imports for 22 years and finally get to see a machinist do their magic.
Great video, had a bunch of engine work done in my younger years with some explanation but this is exactly what I like.
Amazing video! That guy knows his stuff, but more important he is willing to tell you WHAT and WHY is he doing it. Great guy!
Jafromobile and Mark. What we can learn from others never ceases to amaze me. But, Its the people like you who take the time and show the patience to make accessing that knowledge possible. Thanks so much! I've learned a LOT in just two, well produced videos with thoughtful and articulate narration.
Your machine shop is awesome for participating in the video. He did a great job of explaining everything he was doing. You certainly can't do that type of work without very specialized equipment. That's what machine shops and machinists are there for. You have a great relationship with you guys over there. Let him know he has my thanks next time you see him. I learned a lot and watched every second. Your machinist cares about precision performance work. Yet another awesome video.