FordStrokers rotating kits - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #16 of 25 (permalink) Old 04-05-2014, 11:46 PM
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Re: FordStrokers rotating kits

The cost of entry for a custom cam is not as much as you think. It's not much more than an off the shelf cam. And it is expertly tailored to your combination.
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post #17 of 25 (permalink) Old 04-06-2014, 07:34 AM
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Re: FordStrokers rotating kits

X 2 what he said. $337 directly from Comp. $349 if you have Ford Strokers design it specially for your build and application. I highly recommend spending the extra $12 and letting Jim do it. I went through some real frustration trying to come up with a suitable grind with the phone in Comp techs. I went through two of them and the recommendations they came up with were miles apart. IF I even got a call back, that is. Finally gave up and went to Jim and wham bam, thank you mame, I had a new custom grind cam on the way in three days! Jim told me he works directly with the engineers at Comp, not the phone answerers.
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post #18 of 25 (permalink) Old 04-07-2014, 06:42 AM Thread Starter
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Re: FordStrokers rotating kits

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The cost of entry for a custom cam is not as much as you think. It's not much more than an off the shelf cam. And it is expertly tailored to your combination.
I've been reading up on custom cam grinds, and it's not really as cut and dried as I'd like it to be. People saying this guy or that guy does the best job, and an equal number refuting those claims. It's hard to know what to do...

I've found a lot of "calculators" for various camshaft aspects, but most of them require parameters that aren't available based on advertised specs, such as intake lobe centerline, or ground-in advance. In most cases, it appears that you already have to have the cam so you can get the specs off the cam card. If you already have the cam, it's pretty much too late unless you're willing to spend the money on a new cam - again.

How does one calculate dynamic compression with so little info?
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post #19 of 25 (permalink) Old 04-07-2014, 01:45 PM
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Re: FordStrokers rotating kits

All you need to know about the cam to calculate dynamic CR is the intake closing. Plug that figure into any CR calculator and it will give you the dynamic CR as well as the static CR. The UEM (Kieth Black) piston web site has a good calculator.
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post #20 of 25 (permalink) Old 04-07-2014, 04:00 PM
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Re: FordStrokers rotating kits

Most qualified cam grinders or those with years of knowledge in selecting cams can get you to within about 5% of what is ideal for a given combination and the customers goals. Its getting that last 5% that makes the difference to the customer's experience in what is good and what is bad. As was mentioned, there are variables that may not be known to the expert. Good ones will use various calculations and their experience with a given setup. One of my grinders said he ran his combos on 7 different computer programs until he got it right. He did give me a kick-ass solid roller that that was never matched for street/strip usage in my old 393w.

When I built the 427w I knew that the heads were too small for ultimate performance so I went to the guy who knew the best on how to make them run with AFR heads--Ed Curtis of FlowTech Induction. He has a solid reputation and I think that he did me well on my hydraulic roller. If your looking for a $150 camshaft, he is not your man. But, if you think about it, why spend the money for a Dart stroker and skimp out on what is probably the 2nd most important performance part that it needs besides the heads?

As mentioned all you need from the cam is the intake closing degrees. Here is a very good calculator: Wallace Racing: Dynamic Compression Ratio Calculator. How you get the degrees is up to you.

Also most static compression ratio programs give only ball park figures. If you want to be more exact, use this tool from Diamond Pistons: Compression Ratio Calculator | Tools | Diamond Racing Pistons. It is what I used to calculate my compression. Again, info is only as accurate as the data supplied.

The ground in advance is a variable that can be manipulated with an adjustable timing chain. You need to work with that anyways to get the max out of any camshaft design and to ensure that there is adequate piston-to-valve clearance. Simply setting the cam in at zero on the gears is not enough in many cases especially with an inline valve head.

Dennis

65' Stang Street/Strip. Dart 434W NA, Victor heads, G101A 4 Spd, 4:56 rear gear, on 93 octane pushing 3550lbs. [email protected]

Last edited by dennis111; 04-07-2014 at 04:08 PM.
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post #21 of 25 (permalink) Old 04-18-2014, 09:00 AM Thread Starter
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Re: FordStrokers rotating kits

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The 850 DP carb is also a huge overkill with that cam. Its simply not needed for your application. It will not give the street driveability and the economy that a smaller series carb will give.
I was giving some thought to what you said about carb size, and I ran the CID*rpm/3546 formula to come up with 803 cfm. Since I'm assuming that a 100% volumetric efficiency is not "real world", I knocked it down to 95%, applied that value to the previous result, and came up with 763 cfm.

Since the car will be mostly driven on the street, I decided a vacuum secondary would be a better choice. QuickFuel has two carbs available that might be better choices - SS-735-VS and a SS-780-VS.

I'm thinking the 780 would be the better choice between the two. Thoughts?
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post #22 of 25 (permalink) Old 04-18-2014, 10:12 AM
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Re: FordStrokers rotating kits

Vacuum secondaries would be good--you don't need the double pumper for your primarily street usage. I would also believe that the 780cfm would be a good match of the 2 carbs you listed.

95% VE is probably still a little optimistic.

I am not personally familiar with the QF offerings, but I believe they are supposed to offer a truer actual rating than the Holley does (at least I hope so. ) If you were doing the Holley, I would suggest a 950, which actually flows closer to 830cfm. It has smaller venturi body than the 850 but offers a much better carb mixture and better part throttle response. It was the larger venturi of the 850 that I was steering you away from for street use.

With that said, I believe that the stuff from QF is top notch and I've been considering trying one of their race carbs since that is my goal.

Dennis

65' Stang Street/Strip. Dart 434W NA, Victor heads, G101A 4 Spd, 4:56 rear gear, on 93 octane pushing 3550lbs. [email protected]
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post #23 of 25 (permalink) Old 04-18-2014, 12:07 PM Thread Starter
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Re: FordStrokers rotating kits

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Vacuum secondaries would be good--you don't need the double pumper for your primarily street usage. I would also believe that the 780cfm would be a good match of the 2 carbs you listed.

95% VE is probably still a little optimistic.

I am not personally familiar with the QF offerings, but I believe they are supposed to offer a truer actual rating than the Holley does (at least I hope so. ) If you were doing the Holley, I would suggest a 950, which actually flows closer to 830cfm. It has smaller venturi body than the 850 but offers a much better carb mixture and better part throttle response. It was the larger venturi of the 850 that I was steering you away from for street use.

With that said, I believe that the stuff from QF is top notch and I've been considering trying one of their race carbs since that is my goal.
I've never seen ANYTHING bad posted about them. I was considering their Black Diamond carb, simply because it's black.
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post #24 of 25 (permalink) Old 04-18-2014, 09:36 PM
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Re: FordStrokers rotating kits

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I've never seen ANYTHING bad posted about them. I was considering their Black Diamond carb, simply because it's black.
They look nice but I wonder if they are more prone to heat soak and boil over?

Dennis

65' Stang Street/Strip. Dart 434W NA, Victor heads, G101A 4 Spd, 4:56 rear gear, on 93 octane pushing 3550lbs. [email protected]
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post #25 of 25 (permalink) Old 04-19-2014, 04:52 AM Thread Starter
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Re: FordStrokers rotating kits

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They look nice but I wonder if they are more prone to heat soak and boil over?
Quick Fuel Technology - BDQ-950 Carburetor - Popular Hot Rodding

Lighter and apparently run 6% cooler.
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