cam advice.....
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Instructor
Joined: Apr 2013
Posts: 116
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From: Liverpool New York
cam advice
Heads get set up for max lift, not rocker ratio. Somebody is not explaining something correctly to you. Keeping with this a spring that is set up for .700" max lift and you put a .500" lift cam is not good. Since Spintron testing has come around to the industry we have proven that max cam lift needs to max the spring out to around .050" before coil bind. Some feel .070". Some feel right a zero. Large amounts of clearance after max lift promotes spring surge which has been proven in Spintron testing to destroy valvetrain with bad harmonics.
You need to find out what the max lift the heads have been set up for. What is the seat and open pressure of the springs.
Velocity is king on the street. This gives you instant throttle response. The super vic is not going to be a good choice on this engine.
You need to find out what the max lift the heads have been set up for. What is the seat and open pressure of the springs.
Velocity is king on the street. This gives you instant throttle response. The super vic is not going to be a good choice on this engine.
The heads are being checked so I will get all pressures and max lift
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Instructor
Joined: Apr 2013
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From: Liverpool New York
Team Owner
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From: altered state
St. Jude Donor '05
Beter to have a properly sized intake if it means a quick port match maybe even some attention in the plenum area than an intake thats way too big to begin with. 2000 stall dont get carried away wiht the big stuff on the motor.
Drifting
Joined: Jul 2013
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From: Tri-Cities TN
Thread Starter
Instructor
Joined: Apr 2013
Posts: 116
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From: Liverpool New York
The supervic port size is identical to the AFR port size...what would the reasoning be for having a smaller port on the manifold as opposed to the head?
Also, Im still waiting for the valve and spring info....when I determine valve opening(travel) and spring pressures this should greatly help me in figuring out which cam will be appropriate?
Also, Im still waiting for the valve and spring info....when I determine valve opening(travel) and spring pressures this should greatly help me in figuring out which cam will be appropriate?
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Race Director
Joined: May 2005
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From: Millington Illinois
St. Jude Donor '08-'09
The supervic port size is identical to the AFR port size...what would the reasoning be for having a smaller port on the manifold as opposed to the head?
Also, Im still waiting for the valve and spring info....when I determine valve opening(travel) and spring pressures this should greatly help me in figuring out which cam will be appropriate?
Also, Im still waiting for the valve and spring info....when I determine valve opening(travel) and spring pressures this should greatly help me in figuring out which cam will be appropriate?
The Super Victor will not fit under your hood.
Thread Starter
Instructor
Joined: Apr 2013
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From: Liverpool New York
Best option is to have ports match and operating range of intake match the operating range of the cam. The super Victor has an operating range of 4000-8000 rpm. Hot hydraulic rollers usually have peak HP around 6000 RPM and sub 6500 redline. Your giving up a lot of bottom end and midrange with that intake. This one matches your ports and has a lower operating range, closer match. Peak power don't win races. Highest average power across the operating range does. http://www.summitracing.com/parts/WND-7530/
The Super Victor will not fit under your hood.
The Super Victor will not fit under your hood.
Safety Car
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From: anchorage ak
DO MA NEU!
Drifting
Joined: Jul 2013
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From: Tri-Cities TN
The OP if in fact he does have 1.7s will need a hyd roller cam profile that will accept 1.7 ratio and not cause any issues with valvetrain.
Team Owner
Joined: Apr 1999
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
From the first post it looks to be a SBC 406. 1.7 rockers? Why?
Drifting
Joined: Jul 2013
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From: Tri-Cities TN
The same cam lobe profiles are put on various makes of engines. As long as the lobe has a velocity profile that will work with a 1.7 rocker it can be used on a SBC. The lobe has no idea what engine it is. I do fine it strange that a SBC has a 1.7 rocker ratio.
Race Director
Joined: Apr 2000
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I talked to Red at Comp Cams years ago and he talked my out of 1.7 rockers basically said the cam I have is street roller and you are going to put more stress on the springs or have to buy a higher pressure spring which would reach the limits of what they considered a "street roller" and making longevity a problem.
He said if I want more lift get a bigger cam. I went with 1.6 rockers and everything worked fine
He said if I want more lift get a bigger cam. I went with 1.6 rockers and everything worked fine
Race Director
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
This tells me the books you have been reading and the outdated S/W you use has not informed you that don't compare a small block chey to a big block or LS engine especially when it comes to cam and valve train components. These are all different engines and comparing it to LS engine in ludicrous.
Drifting
Joined: Jul 2013
Posts: 1,299
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From: Tri-Cities TN
Your personal attacks must come from something that I have done to you. I don't know what is or when I offended you but I will apologize in public right now for what ever I have done.
Now in my "ClueLessNess" I posted 3 cams above for 3 different engines. All are the same lobe profile. I've never had an indepth conversation with a lobe but as anyone can plainly see all those cam have the same lobe profile on the cam core for the given engine.
SO, with your comment of each having nothing to do with each other then that lobe must only work in 1 of those engines with your statement since they are not the same.
Now in my "ClueLessNess" I posted 3 cams above for 3 different engines. All are the same lobe profile. I've never had an indepth conversation with a lobe but as anyone can plainly see all those cam have the same lobe profile on the cam core for the given engine.
SO, with your comment of each having nothing to do with each other then that lobe must only work in 1 of those engines with your statement since they are not the same.
Team Owner
Joined: Apr 1999
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I don't have exacting information on this SV intake, but I would use one word of caution when talking about intake manifolds. What CI did the manufacturer use to rate this at 4000 -8000 rpm? The answer in the past has generally been 358 ci race motors. 427 ci is @ 20% larger So it becomes a 3200 - 6400 rpm intake.
I'm not claiming exacting figures, but you get the idea. I presently drive around with a plenum volume bigger than a SV and bigger heads than the OP. I never think about some little loss of low end TQ because it is so much greater across the board than any sub 400 ci motor. If you have to ease into the throttle 1st gear of a 700R4 why would you be concerned about gaining some little bit of low end TQ?
Now my 383 uses the weiand 7530 single plane because it is so much smaller
I'm not claiming exacting figures, but you get the idea. I presently drive around with a plenum volume bigger than a SV and bigger heads than the OP. I never think about some little loss of low end TQ because it is so much greater across the board than any sub 400 ci motor. If you have to ease into the throttle 1st gear of a 700R4 why would you be concerned about gaining some little bit of low end TQ?
Now my 383 uses the weiand 7530 single plane because it is so much smaller