Thread: Cam issue

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Using the Wallace computer, http://www.wallaceracing.com/dynamic-cr.php
I want to input a figure, but I don't know how to drag it off the cam card,
http://www.compcams.com/Technical/Se...umber=12-212-2, its asking me for the abtdc figure at .50, and I cant find it. Can somebody help me out. Thanks.

Thanks Denny. When I entered these numbers to get my Dynamic cr, I got a what I thought was a bad "report card". I am 4.040 on the bore, 3.48 on the stroke, 5.7 on the rod, 10.23:1 cr, I dont know the boost number I should use and 650 on the alt. Would you like to plug those numbers in for me on that chart and see what you "thaink" about those numbers it spits out. I really trust your opinion. If you'd care not to bother I appreciate the input already given, Thanks. Jim

Do those sound like "healthy numbers to you? I know I'm sounding geneic here aren't I? That 2.67 number doen't sound like I'm being efficient with the cylinders, but I dont know what a "good" range is. The Dyn cr is 7.95:1. Is that low for a warmed over 350? Diggin for knowledge here! lol

How do you get boost?

I have the block I was telling you about(the specs), with 462 heads/2.02 valves, with 1.6 rockers. Just trying to get a hot little street motor here, nothing fancy. The machine shop suggested this grind, but running the Wallace numbers , it doesn't sound right. Its for a 4 speed 87 camaro.

.020 and .040 if I am not mistaken.

Thanks Denny for hanging with me. I know the pistons are the Speedpro H345np, they are 7cc flat top, I believe. ( At my age CRS disease is settin in). I'll have to remember how to get the chamber cc's and I'll try yelling at ya again. Thanks so much for the assist. I'll go out to the garage tomorrow and measure myself again. Thanks.

Originally Posted by DennyW

Something is not quit right.

Recheck your specs on this motor.

Piston chamber cc'S, and piston top volume, I also need. You have to be sure on the deck height. Head gasket sounds right.

Denny,I think his chamber volume is off.
His heads should have a combustion chamber volume of around 64 cc if the have not been surfaced to much or milled.
The 79 cc's seem's a little large to me.

Quicker than that! I really gotta go to bed. But the head cc's are 61. the piston to deck is .021. Des that help?

Thanks Guys really appreciate it!