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#1
05-26-2023, 12:13 AM
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Angeles and McCarthy Elliptical valve job
Anyone know the specifics of the Eliptical valve job they spoke of in their books? I’ve heard others discuss this but haven’t heard the specifics of it.
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Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
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#2
05-26-2023, 05:52 AM
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I have both of McCarthys books and there is not word one in there about any such valve job.
All there is shown in one book is a as of that time period legal NHRA valve job for the stock class of cars. Can you give a specific book title and page numbers? In terms of running a boosted motor like you are, I don't think the issue of reversion is as great.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
05-26-2023, 06:16 AM
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I have their books and previous H-O racing newsletters about their cars and H-Os cars and books and nothing mentioned about elliptical valve design.
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#4
05-26-2023, 10:28 AM
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The only thing I have seen, is a non round throat area and it was not in a Pontiac head.
Stan
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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#5
05-27-2023, 12:45 PM
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I don't recall Pete getting much into the details of his elliptical valve job. In fact he was pretty much tight lipped on the details of his Super Stock valve job he shared the flow numbers in his second book... Probably with good reason.
These pictures are of an elliptical valve job done back in the 80's by one of the top Pontiac head porters. The top cut mimics the bottom cut just not as pronounced due to the small top angle. |
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#6
05-27-2023, 04:20 PM
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Quote:
This isn’t for one of my turbo cars they dont care much about head work it’s for a NA set up. . Which sadly I’m just not that well versed in anymore after turbocharging for so many years I used to race NA w quadrajets and I can hardly remember anything from back then. I do boats , 2 stroke outboards, airplanes lycoming mostly, 2 stroke yamaha jetskis supercharged 4 stroke seadoos, , dodge deisels , it all gets confusing after a while . Too many directions Either that or I’m just plain getting old .
__________________
Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
| The Following User Says Thank You to turbo69bird For This Useful Post: | ||
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#7
05-27-2023, 03:04 PM
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That looks like a original Production RA4 casting you got there.
It’s so obvious that those chambers where a refinement of the 1967 061 head.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 05-27-2023 at 03:09 PM. |
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#8
05-27-2023, 09:14 PM
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Had me thinking it wasn’t in there haven’t read these in many years . Was just about my Bible at one time.
__________________
Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
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#9
05-28-2023, 11:51 AM
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Quote:
Stan PS - Some might find this thread interesting. Dykem and a Flow Bench https://www.speed-talk.com/forum/vie...7f0bfc4a52d48f
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm Last edited by Stan Weiss; 05-28-2023 at 11:58 AM. |
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#10
05-28-2023, 06:44 AM
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Ok so he does mention it, but gives no details.
The main benefit I see with that type of valve job is to enhance the effect of port bias that is inherent in any non Hemi type head ( non wedge chambers ) with parallel valves . In a way Vizard has done the same thing with his patented 4 valve Hemi mod where one intake and one exh valve are a little smaller then the other two. If you have a flow bench and the equipment to do valve jobs then the bottom cut depth/ height around the bowl is what will have the most effect on minimizing the velocity profile differential between the long side of the port and the short side, be it intake or exh. Like you said, when running boost this matters very little, unless your cam pick is way over the top!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#11
05-28-2023, 10:51 AM
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Uh oh i need reread his book.
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#12
05-29-2023, 11:54 PM
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__________________
Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
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#13
05-30-2023, 12:20 AM
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and I know some of you have seen this already but thought it was relevant to add to this thread as well
https://youtu.be/mQwon4Gfzfo
__________________
Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
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