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  #16 (permalink)  
Old 04-25-2013, 05:04 PM
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Use one of the cams I listed.

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  #17 (permalink)  
Old 04-25-2013, 05:26 PM
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Quote:
Originally Posted by buddy6350 View Post
Well I'm trying to build something just to drive on Friday night. Just something to cruise with. I would have figured with the 71 lt1 having pretty much the same piston just with 64cc chambers and the 72 having flat pistons and 76 CC chambers. The 71 being 11:1 and 72 being 9:1. I would have figured mine to be in the middle at 10:1. Not considering the .030 over. But I planning on running it on an octane booster, as for gears I have a 9". Ford rear end. It has 3.50 gears. I really just want a quick 0-100 nothing more. And maybe a good set of breaks. I've got a 78 elcamino. But planning on buying a different. Car to put this in after its done, so I don't rush it. Ready to roll and then drop it in
For the most part octane booster is a waste of money.

If you want a quick street car go with a relatively mild cam, in the 215-220 range and get a mild stall, around 3000. Combine that with your 3.50 gears or even a little more and it'll be a very snappy street cruiser. If its well tuned you should be able to run it on premium if you're a little under 10:1. Otherwise you'll need to throw some race gas in with it too. 100, 110, hell even e85 can all work.
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  #18 (permalink)  
Old 04-25-2013, 08:12 PM
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solid/hydraulic

Quote:
Originally Posted by buddy6350 View Post
Well I'm trying to build something just to drive on Friday night. Just something to cruise with. I would have figured with the 71 lt1 having pretty much the same piston just with 64cc chambers and the 72 having flat pistons and 76 CC chambers. The 71 being 11:1 and 72 being 9:1. I would have figured mine to be in the middle at 10:1. Not considering the .030 over. But I planning on running it on an octane booster, as for gears I have a 9". Ford rear end. It has 3.50 gears. I really just want a quick 0-100 nothing more. And maybe a good set of breaks. I've got a 78 elcamino. But planning on buying a different. Car to put this in after its done, so I don't rush it. Ready to roll and then drop it in
would you consider using a solid or roller cam instead of a flat tappet hydraulic?
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  #19 (permalink)  
Old 04-26-2013, 08:34 PM
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Originally Posted by ap72 View Post
I already have given you a much better alternative many times. And that is picking one based on application. Displacement, target use, and induction and exhaust are ALL more important than compression.

DCR means what exactly? It's a fancy way of renaming cranking compression. Hell your target DCR is again dependent on loading and fuel so any "target DCR" is void as soon as I suggest changing fuels, cylinder heads, or in some borderline cases even induction and exhaust.

DCR is a RESULT that can be checked to help provide assurance- it is NOT the starting point.


I know you attempted to simplify things, but you not only over-simplified it but also used one of the worst metrics as a scale. A more common set of metrics would be RPM and displacement which is more accurate than your approach but still leaves a lot of room for problems.

The plain and simple truth is that you CANNOT simplify cam selection by that much and still claim to have valid results.

From what I understand your "research" came from the cam catalog of Comp, you gathered your results by selecting the target static compression ratio listed in the cam descriptions. You also chose to throw away anything they listed about RPM, induction, exhaust, usage, etc. Interesting that your argument is that their recommendations are to be trusted because of their experience yet you started by throwing away 80% of what they recommended as you deemed it irrelevant.

My "alternative" is to simply use the traditional methods of cam selection and throw away this silly idea that there is a singular trend that can be followed in cam selection, especially a trend based on such an irrelevant parameter.

DCR is a CHECK, not a target.
Mark Twain said it best.....
"Never argue with a fool; onlookers may not be able to tell the difference"
I'm very tired of trying to make sense to you. You've been on this forum long enough to have learned something useful, but all of it seems to have avoided you.
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