Intake valve power ringz
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Thread: Intake valve power ringz

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    UngerDog ungermm's Avatar
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    Intake valve power ringz

    I'm rebuilding the head on my free GT and came across an article that included increasing performance with a trick of cutting rings on the back side of the intake valves. It reminded me of the ancient Chinese piston dimple trick. I searched this site, but couldn't find anything about this. Is this worth the effort for a stock 1.9 high compression rebuild?

    Prepping Valves for Performance

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    Project 1450 supporter... Site Supporter My location RallyBob's Avatar
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    All I'm thinking is 'stress risers'. Looks like you would just create half a dozen places on the valve for a crack to propogate from.

    Even the guy who wrote the article doesn't make any power claims. He says 'less prone to detonation' and 'better fuel economy'. FWIW...
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    Opeler My location SpringGT's Avatar
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    Quote Originally Posted by RallyBob View Post
    All I'm thinking is 'stress risers'. Looks like you would just create half a dozen places on the valve for a crack to propogate from.

    Even the guy who wrote the article doesn't make any power claims. He says 'less prone to detonation' and 'better fuel economy'. FWIW...
    I very much agree. Introducing this many grooves and sharp edges on a valve head while removing all of that material is just asking for trouble, even if it had any power benefits.

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    Non Civilian My location opelwasp's Avatar
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    I would suggest trying Singh Grooves before weakening your valves.
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    Pedal Smasher Autoholic's Avatar
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    Quote Originally Posted by opelwasp View Post
    I would suggest trying Singh Grooves before weakening your valves.
    I know, another thread resurrection...

    I would not recommend any modifications to the combustion chamber that result in a sharp radius. Taking a look at what some of those "improvements" are, I'd bet that these individuals do not have an engineering degree. Any potentially sharp radius edge in a combustion chamber, will add heat sinks. And I'd be worried about running a groove right up to the edge of the gasket, that will provide a channel for pressurized gases to target a small section of your gasket. Long term, I see gasket failure being a problem.

    Of all the high end engines I've seen internal shots of, a consistent but rough surface seems to be the ideal surface to create for a carb'd engine. The crazy builds, replicate golf ball dimples in the intake runners via CNC machining. So the "lynz" in the intake port do make sense, if you're trying to add turbulence but there are other more consistent ways to do this. The problem I see with the CIH, is the intake manifold. If I was trying to maximize performance and fuel economy at the same time with a CIH, I'd ditch the intake manifold and make a tubular intake. Think headers, but for your carb. Run a 38 DGV and a tubular dual plane. The intake pulse will be stronger and flow will be improved, because the air / fuel charge won't slam into the bottom of the intake. Either round or rectangle tube would be an improvement, and good pipe bender.
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    Tennessean Site Supporter My location hrcollinsjr's Avatar
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    Quote Originally Posted by Autoholic View Post
    I know, another thread resurrection...

    Taking a look at what some of those "improvements" are, I'd bet that these individuals do not have an engineering degree.
    Did Smokey Yunick? I'm not disagreeing with your previous statement. While a formal education may look good, it doesn't always equate intelligence. I'm sure many great discoveries have been made by people lacking a 'formal' education in the area of their discovery.

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    Last edited by hrcollinsjr; 02-14-2017 at 08:14 AM.
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    Smokey experimented however. I'd be willing to bet for every performance discovery he made, he made 3 discoveries of how to decrease performance. A formal education in engineering would just help you make less bad discoveries and possibly more good discoveries. One way or another, it all comes down to education. It's just how did you learn what you know? Both routes cost money, tools and experience. Only one helps you understand why most of the time. Anyone can create an explosive, fewer can explain why it went bang.

    I'm not trying to make it sound like a college education is all that and a bag of chips. College is a tool, for some it is needed / required to do what they want to do. Some just need a solution, they don't care why the solution worked.
    Last edited by Autoholic; 02-14-2017 at 07:57 PM.
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    cutting rings on the back side of the intake valves/ golf ball dimples in intake

    G'day again, I hadn't heard of rings cut in the back of intake valves but I saw a rally engine in the 80's with a deep ring cut around the back of exhaust valves to stop exhaust flow reverbing back. And I have incorporated a golf ball pattern in the bottom of the intake manifold plenum floor in the hope two stop fuel pooling with minimal effect on the flow. Its good to experiment I always remember Murphies Law (if it can go wrong it will ) and stick with kiss (Keep it simple stupid ) if an idea gets to complicated sit back and find a simpler approach .
    Have fun with your project and remember you are building it for you and other don't have to agree.

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