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| Critique my Cam. https://slantsix.org/forum/viewtopic.php?t=41914 |
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| Author: | drgonzo [ Thu Sep 16, 2010 1:16 pm ] |
| Post subject: | Critique my Cam. |
Looking at some lobes from Oregon Cam Grinding and came up with this cam. 63 Dart, 904, 3000 stall speed 3.55:1 gears 9.0:1 CR Hyper Pak 450Holley Clifford Headers Intake: from Grind #819 Lobe LIft-.291" Duration @ .050" - 219 Duration @ .020" - 248 Valve Lift: .437" Intake centerline- 106 Exhaust: from Grind #818 Lobe LIft-.287 Duration @ .050" - 212 Duration @ .020" - 240 Valve Lift: .431" Intake centerline- 110 LSA 108 @.050 In opens 3 closes 36 Ex opens 42 Closes -10 |
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| Author: | Dart270 [ Thu Sep 16, 2010 2:23 pm ] |
| Post subject: | |
Those are almost stock cams, in my book. If you are trying to make some HP, go bigger. I don't consider anything under 220 @ 0.050" a performance cam for the 225. With a 3000 stall, you can easily run something in the range 226-240 @0.050". With 9.0:1 and that stall I would run the Oregon #346 as is: 234 @0.050" INT 228 @0.050" EXH 106 LSA 0.480" lift on both Install it at 100 deg centerline. On the other hand, you can ask anyone on this site, and they will tell you that I like bigger cams than many other folks. Lou |
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| Author: | Joshie225 [ Thu Sep 16, 2010 2:27 pm ] |
| Post subject: | |
That's a pretty tame cam. It would probably work well with a stock torque converter if the compression ratio really comes in at 9:1. If you want something that idles smooth and has a lot off off-idle torque it's a good choice, but it doesn't need a 3000 RPM stall converter. If you want more power stick with that converter and bump up the cam duration and compression ratio. |
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| Author: | drgonzo [ Thu Sep 16, 2010 7:04 pm ] |
| Post subject: | |
I was trying to come up with something close to the Erson RV15 RDP. Doc suggested the 3000 stall with my 3.55 gear. Perhaps misunderstood. I will look onto something bigger. Hmmmm. Thanks guys. Brad |
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| Author: | drgonzo [ Thu Sep 16, 2010 7:08 pm ] |
| Post subject: | |
Idle quality is not important to me. I want to buy ONE cam even if it is not optimum for my set up initially as this will be an on-going project. That 346 grind does look good. |
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| Author: | Joshie225 [ Thu Sep 16, 2010 7:31 pm ] |
| Post subject: | |
The Oregon #346 cam will make good power if the cylinder head flows well and nothing else is really wrong. I'd try for 10:1 compression ratio with that cam, but it will be alright with at least 9:1. Measure the piston to deck clearance. Feeler gauges and a straight edge will do. Using that measurement along with the bore size and cylinder head CCs we can calculate the compression ratio. Well, you can too. I like the calculator on the KB pistons web site. http://www.kb-silvolite.com/ |
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| Author: | Dart270 [ Fri Sep 17, 2010 5:39 am ] |
| Post subject: | |
Cam choices can vary based on skill of tuning and preference for engine combo. Doc will recommend one cam for a combo, and Josh another, and I another. All of them could work well if the motor is set up well and tuned well. I have tried about 6-8 cams with a range of specs over the years, with different centerlines and such. Doc has tried many more. My point is that there is not one solution, but a family of solutions. Let the discussions continue...  Lou |
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| Author: | drgonzo [ Sun Sep 19, 2010 5:36 pm ] |
| Post subject: | |
I understand. I have built quite a few SBC and SBF engines for street and race application. I am just drawing on the more experienced of you as I have never hot rodded a slant six. Thanks guys. Brad |
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| Author: | 66aCUDA [ Mon Sep 20, 2010 6:21 am ] |
| Post subject: | |
So what are the head specs? What does it flow, what valves, etc. Also purpose, car weight, etc. Frank Im with Lou on the heavy cam side of things. |
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