Input on this combo?
Input on this combo? Well after extensive searching, some DCR excel spreadsheet work (thanks pianoprodigy), million PMs, I think I've narrowed down my search. I am pretty set on the TR230 cam, due to consistently seeing great numbers as well as healthy torque numbers. I'm looking to match it with the Livernois Stg2 heads with the comp 918 springs (.625 lift, the TR230 is in the .57x range on both sides so that should be adequate for long spring life, no?). I am not looking to mill, but use a .040 gasket giving me what appears to be a .033 quench, a 11.1x:1 SCR and ~8.44:1 DCR. I have also been pointed in a direction that includes AFR 225s, which at first I wasn't too keen on, but after weighing the price of the 90 90 combo, if I just put that price tag onto my heads, I'm at the AFR price tag. I chose that cam because it has shown to me some great under curve power, still can pull to redline, I drive the car everyday and the overlap is only 5* so that shouldn't be too outrageous for times when I'm putting around in traffic. Is my logic good, flawed, wrong, or just ugly? If you have any other suggestions feel free to voice them, I'm open to other cams in the same range (this doesn't include t-rex, MS3, MS4, G5x4, or anything remotely close to the 240 range). Thank you for your help.
-J
-J
The AFR heads have large chambers, what chamber size did you calculate DCR with? Also the AFR 205 runners may be more suited to your needs. The relative low lift does not always guarantee long spring life.
Other than that it sounds like you did your homework. 8.44 DCr with 5 degrees overlap makes for a good DD cam.
Other than that it sounds like you did your homework. 8.44 DCr with 5 degrees overlap makes for a good DD cam.
I used the 64cc chambers which is what I had found when searching for 243 casting chamber size... I see they have the 205s with a 62cc Chamber potentially bumping SCR and DCR up to 11.36 and 8.68 respectively... wow. Here's one more question since I didn't see any place for it in the calculator, why would I benefit from the 205 runner versus the 225, velocity of the intake air due to being smaller? And therefore a larger runner would hurt me unless I'm spinning it up real high? Or am I mistaken... thanks for the response.
-J
EDIT: didn't see a 62cc version on AFR's site, I was on thunder's and saw a 62cc, apparently only offered in 66 and 64? Well regardless, I guess ignore the new CR numbers, and I'd imagine if I got the 64cc they are "as cast" versus the CNC'd 66cc ones. I guess I'd be better off with the ported ones and then mill them to compensate and reach 64 or even the 62cc?
-J
EDIT: didn't see a 62cc version on AFR's site, I was on thunder's and saw a 62cc, apparently only offered in 66 and 64? Well regardless, I guess ignore the new CR numbers, and I'd imagine if I got the 64cc they are "as cast" versus the CNC'd 66cc ones. I guess I'd be better off with the ported ones and then mill them to compensate and reach 64 or even the 62cc?
Last edited by lastcall190; Jan 17, 2007 at 09:32 PM.
Originally Posted by lastcall190
I used the 64cc chambers which is what I had found when searching for 243 casting chamber size... I see they have the 205s with a 62cc Chamber potentially bumping SCR and DCR up to 11.36 and 8.68 respectively... wow. Here's one more question since I didn't see any place for it in the calculator, why would I benefit from the 205 runner versus the 225, velocity of the intake air due to being smaller? And therefore a larger runner would hurt me unless I'm spinning it up real high? Or am I mistaken... thanks for the response.
-J
-J
I would think long and hard about doing the 90/90 setup, AND getting the manifold ported. IIRC, TEA did some testing and ended up changing their stance from "better to have the best heads" to "better to have mediocre heads with the 90/90". If you have the money, do both. But don't totally oppose the FAST setup.
Just my opinion.
Just my opinion.
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Originally Posted by matts22
I would think long and hard about doing the 90/90 setup, AND getting the manifold ported. IIRC, TEA did some testing and ended up changing their stance from "better to have the best heads" to "better to have mediocre heads with the 90/90". If you have the money, do both. But don't totally oppose the FAST setup.
Just my opinion.
Just my opinion.
-J
Originally Posted by lastcall190
Nobody?