[Steve C.]

Very interesting with the 3316 vs 3319 graph.

Note the section for LIFT in the link below. Where two lift curves are also shown for two different lobes, as here both have a duration of about 250 degrees at 0.050. And one has more lift. And they state in most cases the additional flow throughout the heart of the lift event is significant and it translates directly into improved performance.

https://www.tildentechnologies.com/C...rformance.html


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[pastry_chef]

Dynomation prefers the 3319 over the 3116.

463 @ 6200 RPM in Rick Jones software.

Hyd roller.

[Stan Weiss]

More lift more duration at peak flow.

But if the lower lift cam has more duration earlier it can have more flow at peak piston speed

Bore = 4.155 Stroke = 4.25 Rod Length = 6.625 RPM = 6500
Wrist Pin Offset = 0.0
Piston Speed is 76.73611 Feet per Second
Piston Speed is 4604.16667 Feet per Minute
Maximum Piston Velocity 7598.323903 FPM @ 73.67589 Degrees

Stan

[Steve C.]

MANY years ago David Vizard developed a program called Cam Master, a comprehensive computer program that offers precise cam selection. It's an empirical program based on over 50,000 individual engine dyno pulls on various engine combinations. After input the program provides the specifications for a recommended cam, and topping the list is valve lift. The engine wants all the lift it can and the valve lift figures provided by the computer program indicate engine requirement but it may not be mechanically achievable.

(and my comment, in some cases prohibitive because of cost limitations)

And to muddy the water further with something related....

"Peak intake airflow is a common reference when comparing cylinder heads. While that figure is very important, especially for attaining strong peak horsepower, a cylinder head spends very little time at peak valve lift and considerably more time reaching that point. Considering airflow throughout the entire valve lift range is more important. Strong low- and mid-lift airflow starts cylinder fill quickly and effectively and continues filling the cylinder until the intake valve closes."
HOW TO BUILD MAX-PERFORMANCE PONTIAC V-8S


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[Stan Weiss]

Originally Posted by Steve C.

MANY years ago David Vizard developed a program called Cam Master, a comprehensive computer program that offers precise cam selection. It's an empirical program based on over 50,000 individual engine dyno pulls on various engine combinations. After input the program provides the specifications for a recommended cam, and topping the list is valve lift. The engine wants all the lift it can and the valve lift figures provided by the computer program indicate engine requirement but it may not be mechanically achievable.

(and my comment, in some cases prohibitive because of cost limitations)

And to muddy the water further with something related....

"Peak intake airflow is a common reference when comparing cylinder heads. While that figure is very important, especially for attaining strong peak horsepower, a cylinder head spends very little time at peak valve lift and considerably more time reaching that point. Considering airflow throughout the entire valve lift range is more important. Strong low- and mid-lift airflow starts cylinder fill quickly and effectively and continues filling the cylinder until the intake valve closes."
HOW TO BUILD MAX-PERFORMANCE PONTIAC V-8S


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Steve,
Where did you find this?

Thanks,
Stan

[pastry_chef]

I don't think the quote Steve mentioned is here but other information.
http://www.motortecmagazine.net/a-ne...ms-speed-spec/

[Steve C.]

David Vizard's Cam Master program was featured in National DRAGSTER. Also Muscle Mustangs & Fast Fords magazine in 2002. Years ago David worked in conjunction with Denny Wycott of Motor Machine & Supply in Tucson, Arizona. He is mentioned in the article above. After visiting Crower and David Vizard in California I met with Denny in Tucson on my way back to Texas. Later I had Denny do some profiles for a previous 462 engine with the Cam Master program..


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[Stan Weiss]

Mike / Steve
Thanks for the information. I have a copy of David Vizard / Motor Machine & Supply Cam Master program. I was just trying to understand some more of its history.

Stan

[n20ta2]

Ok, super quick turn around from Kauffman. This is what he sent. Cam card is posted. Looks like comp hydraulic roller 556/550 lift I'm assuming figured with 1.5 rockers? 254/258 duration @.050 ground on a 110. What lift can I expect with 1.65 rockers? Thoughts on this cam?

[Dragncar]

.612 on intake, .605 on ex.
1.7 rockers will get you around .630 lift.
IMO its a nice street cam for E heads. High Ports want more lift.
With this cam you are stopping lifting the valve right before the head starts to shine the most.
It all depends on what you are after. It could very well do exactly what you want it to do.

[Stan Weiss]

Xtreme XFI Int. Rated Duration @ .006 Tappet Lift
3020 304 254 176 .370

Xtreme XFI Exh. Rated Duration @ .006 Tappet Lift
13148 310 258 178 .366

Stan

[Formulajones]

Originally Posted by n20ta2

Ok, super quick turn around from Kauffman. This is what he sent. Cam card is posted. Looks like comp hydraulic roller 556/550 lift I'm assuming figured with 1.5 rockers? 254/258 duration @.050 ground on a 110. What lift can I expect with 1.65 rockers? Thoughts on this cam?

That's sort of close to the same hydraulic roller that Kauffman spec'd for an old 10:1 455 engine dad ran years back. With Kauffman ported round port E heads he sent along a 254/262 @ .050 on a 110 that was close to .600 lift with 1.5 rockers. We ran 1.65's on it. Worked nice in his engine. Drove it on the street everywhere for years.

[Steve C.]

The cam was probably sitting on a shelf

The "20" in the serial number for the year ?


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[slowbird]

Originally Posted by n20ta2

Ok, super quick turn around from Kauffman. This is what he sent. Cam card is posted. Looks like comp hydraulic roller 556/550 lift I'm assuming figured with 1.5 rockers? 254/258 duration @.050 ground on a 110. What lift can I expect with 1.65 rockers? Thoughts on this cam?

You will have to let us know how it runs.

[n20ta2]

Yes it was definitely sitting on the shelf there at his shop , I did tell him I would put some street miles on it. Right now I'm not close to any tracks outside new england dragway and it's 2 hrs away so my trips there might be once or twice a year. We anticipate a move back to Florida hopefully in a year or two so I should be 1/2 hr away From Bradenton Motorsports Park. when that happens I will go a couple times a month so a bigger cam makes sense at that point.

[Steve C.]

I spaced where you previously said in the thread they already had it on the shelf. Ok because you needed it 'now' and if he had to order another custom cam with a more appropriate lobe lift that would have taken weeks if not months.
Go enjoy it.


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[n20ta2]

Originally Posted by Steve C.

I spaced where you previously said in the thread they already had it on the shelf. Ok because you needed it 'now' and if he had to order another custom cam with a more appropriate lobe lift that would have taken weeks if not months.
Go enjoy it.


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Sure will thanks! I would be happy with hp numbers between 575-600 for right now. Maybe with a touch of porting and more cam later I can reach 700, honestly at that point I know my matching numbers block is in jeopardy so it might be an aftermarket block .

[Steve C.]

The heads unported will support 700 hp.


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