Valve Performance diy Modifications & Why I'm NOT Back-Cutting My Valves
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- เผยแพร่เมื่อ 23 พ.ค. 2020
- My opinion of Modding Intake & Exhaust valves for Performance and how I do it. I won't be demonstrating a Back-Cut mod but I do explain how & why I'm not. The Elgin valves are for some resent heads I bought and the oem from a crate vortec engine.
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th-cam.com/play/PL7o4U7VWtLLc2cFgpyAE2_zQwuMBphoFc.html
This is great info, thanks.
WoW!!! Decent idea but PAINFUL TO WATCH WITHOUT DRINKING!!!
Don't watch David Vizard's video where he uses a cordless drill and bench grinder then.
I am impressed with this method. I’m old school n I’ve never seen this done. I’m doing this
I did this with some scooter valves, one set filed easy, the next set cut a groove in my file! Haha didn't expect that!
I was surprised how much harder the eBay valves were than stock valves.
Theoretically amazing idea, My concern is how to take material evenly from each valve.
It's close enough. Go check out David Vizard's channel, he uses a drill and grinder. I didn't invent this mod it's old school!
Michigan gear heads are the best.
Warren Michigan in the house with a 84 cutlass but it ain’t no god damn mouse love the content bubs
Is That Ridge Or Lip On The Exhasut Valve An Issue If Some Exhasut Valves Have It And Some Do Not? For Some Odd Reason I Got A Set Of CNC Ported Heads With Larger Valves etc. They Forgot To Shorten The Valve Guides For More Cam Lift Clearnence So I Did That My Self. When I Had It Apart And Inspected All The Valves And Seats I Noticed 2 Of The 6 Exhasut Valves Had No Ridge On Them While The Rest Had The Ridge. (this is a 6 cylinder 2 valves per cylinder engine). Do You Think This Is Going To Be An Issue If Some Valves Have The Ridge And Others Do Not On The Same Cylinder Head? This Is A Turbocharged Engine. What's Weird Is The Valves That Do Not Have The Ridge Sit Further From The Head Requiring A Longer Pushrods On Those Valves About .025" Longer (hydraulic lifter engine). It Took Me 2 Years To Get These Cylinder Heads And I Just Want Things To He Right If Something Is Not Right.
Just a quick data point: I wanted to make a very flush set of 4 valves to put into my head while polishing the combustion chambers on a BP4W Miata head. I threw old valves into a metric collet on my milling machine, threw a lathe tool into the vise and used it like a lathe. The valves were not hardened or work hardening. It would be possible to modify a full set of these valves using machinist techniques to make them all the same. If they had been 304 or something like that, it would be difficult at best. Not sure if this holds for all makes of valves. If you are here, more power to you!
For dummy chamber grinding valves, I just use a hand drill and bench grinder. David Vizard does his Back-Cuts that way. For "some things" the mod itself is most of the gain, being very precise n consistent isn't that much more or any "sometimes". If DV is happy using his eyes to back-cut valves, then that's good enough for me.
@@BOOT Funny, I think I saw the video you are talking about this week. DV knows his stuff. I wish he'd given a few more specs about his grinds, but I suppose you don't want to give it all away. Oh well, my motor is together and I'm hopefully I'm not pulling it apart for a long time.
I appreciate you sharing the knowledge you've been extremely helpful.
im always down to learn something thanks, i have never heard of someone doing this.
I've got a few old-school tricks up my sleeves
no volve grinding compound?
What kind of racing do you do?
In my opinion the exh valve mod has 5 effects, two were covered in the video
Boot I have a question for ya.. ) I dropped a valve on an aprilia rsv4 engine and the intake valve is a titanium :/ Can I order / get a titanium valve blank and have it cut too dimensions of o.e.m valve size... would it be cost effective... they want 500$ for 1 intake valve from aprilia :/ What would you do in this situation
Sorry can't help, no clue bout Titanium stuff but GL!
I've never heard of or seen reversion going all the way back into the intake manifold runners, it seems impossible to me, like how does the engine even run, you must have cam timing with a super early opening intake coupled with a horrendously poor flowing exhaust.
That staining looks more like heat cooking fuel in the boundary layer, how hot you runnin this thing ?
Are you running a shit ton of cam advance ?
Also it seems to me not back cutting your intakes would make the situation even worse not better ? i think your thinking that one backwards ?
They have Anti Reversion plates that go under the carburetor, this combo liked one. Also search on youtube "kaase aetc video"
@@BOOT Shit dude that was f-in cool, talk about hands on eh !! Okay im gonna think about this reversion thing some more. tks.... for others who may be interested a direct link : th-cam.com/video/7Iq1B-2paCs/w-d-xo.html&ab_channel=NickNorris
@@BOOT Years back when i first build a bench and started flowing heads i built a spacer like that for a single 4 barrel set up but i had 4 clear plexiglass tubes, i fired the thing up, revved it a few times and the plexiglass started cracking everywhere because it got ice cold, i glued the cracks but didn't do any more testing , it became a shelf ornament. Buddy in the video must be using Lexan.
@@luckyPiston I didn't link the video sometimes youtube flags links as spam but the poster never knows. Anyways here's another with more info th-cam.com/video/ElcbVBOs5TE/w-d-xo.html
хорошее видео!!!
Thanks!
Valve master 🙏
Not one single valve will be the same with this file method
They don't need to be. I've herd more than one PRO say, the exact back-cut angle doesn't matter long as it's in a range. Again, my example is David Vizard using a hand drill and bench grinder to back-cut his valves. He shows himself doing it in one of his videos, go check it out.
Dude! Buy a supercharger and you wont have to waste your time doing that crap!
I like figuring out all the little power tricks but yah it's a lot of work! I'd prob do it anyway now that I know how to, even if I had a power adder LOL
You need to remove even more exhaust if the engine is supercharged LOL.
Painful to watch.
Don't go watch David Vizard's video then
🙄
Why would you create a video thats only going to lead people to destroy their valves... Best you can do is remove this video
It's a proven mod. Go watch David Vizard do the same thing, only he uses a hand drill and grinder.
@@BOOT i don't have an issue with mod....its the method used, high error and unrepairable damage...
The mating area of both valve and seat are precision work... no regular desk press drill nor hand can do such work..
Valve mating angle has little to no noticeable effect when turbo charge.
@@willis23jm1 The method is in a book, again it's old school well proven. It doesn't compromise the sealing angle of the valve to the seat unless you hold it at that same angle or otherwise hit it. Which can be easily checked with some dykem or a sharpie after. I suggest you do some research on the subject.
@@BOOT exactly, some trolls don't know what they are talking about!
I understand your..."thought" process. But why are you installing a bigger cam.. your installing it for more power right? Why would you hinder that if this theory works and lose power .. especially a 30-40- or even a 50hp loss. Makes no sense. If it isn't fouling plugs which it shouldn't cares about exhaust in the intake. That's "normal" for high lift overlapping camshafts. Your thinking too much into your "hotrod" build. Whomever told you that you bought it but it's definitely a mistake. Need to make a video on how this was a mistake. Period. You'll get more likes
Do you understand how some seat Valve Jobs hurt/help low lift flow, it's the same principle
@@BOOT you do what you do. But eventually you'll come around. No one says... I'll lose power mid lift to keep a cleaner intake. That's the truth to the video. A dirty intake. Lol.
But it's your build.
@@gpt5002 And you keep doing w/e your doing, FYI Google reversion. It's not bout a clean intake, maybe try watching the video