A suitable cam for a 434
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Sorry Danlee. Forgot to give you all the information.
I have one hydraulic roller cam now that I was going to swap for the abovementioned cam. It's specs are as follows:
http://www.cranecams.com/?show=brows...tType=camshaft
Any comments would be most welcome
Thanks again
Craig
I have one hydraulic roller cam now that I was going to swap for the abovementioned cam. It's specs are as follows:
http://www.cranecams.com/?show=brows...tType=camshaft
Any comments would be most welcome
Thanks again
Craig
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From: Delaware
With a Crane #528371, the Torque is 404@2000 RPM, and peaks at 549@4500 RPM. The peak HP is 562@6000 RPM. The difference between this and the original number is the ICL is 103 degrees vs 108 degrees. This advances the cam. The overlap is 73 degrees and it will have a rough idle. The IVC is only 65 degrees and the DCR is 9.66:1. With Iron heads, it would require 101 Mean Octane. You could retard it 4 degrees, but the low RPM torque will drop. You might think about dropping the static CR.
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Thanks for your prompt reply Danlee. Well, this does create some problems. What about the last cam specs I supplied Danlee? For the hydraulic roller cam? Would this be more suitable? What figures would you get for this cam?
I look forward once again to your reply.
Craig
I look forward once again to your reply.
Craig
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From: Delaware
With a Crane #529801, the Torque is 384@2000, and 542@5000 RPM. The peak HP is 573@6500 RPM. The overlap is a little better at 68 degrees. The IVC is 76 degrees, and the DCR is 8.76:1. This will run on 95 Octane with Iron heads.
If you advance this 4 degrees, the torque is 394@2000 and 544@5000 RPM. The peak HP is 568@6000 RPM. The DCR becomes 9.1:1 and the Mean Octane for Iron heads becomes 97 or better.
If you change the LSA to 114 degrees, and set the ICL at 107 degrees, the torque is 401@2000, and 544@4500 RPM. The peak HP is 556@6000 RPM. The overlap is only 64 degrees, and the DCR and Octane are the same as above. This should give you a better idle and plenty of low RPM torque.
You should be able to get a HR cam ground like this from Comp Cams.
BTW all these simulations are using head flow for CHI-3V 218cc heads. Different head flow will change these numbers, but the comparison between cams will be the same.
If you advance this 4 degrees, the torque is 394@2000 and 544@5000 RPM. The peak HP is 568@6000 RPM. The DCR becomes 9.1:1 and the Mean Octane for Iron heads becomes 97 or better.
If you change the LSA to 114 degrees, and set the ICL at 107 degrees, the torque is 401@2000, and 544@4500 RPM. The peak HP is 556@6000 RPM. The overlap is only 64 degrees, and the DCR and Octane are the same as above. This should give you a better idle and plenty of low RPM torque.
You should be able to get a HR cam ground like this from Comp Cams.
BTW all these simulations are using head flow for CHI-3V 218cc heads. Different head flow will change these numbers, but the comparison between cams will be the same.
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Re: A suitable cam for a 434
Thank you very much Danlee. This was exactly the information needed. Your efforts have resulted in solid figures. You have saved me from a lot of grief. I have the hydraulic lifters from the Crane cam. Can I use these with another hydraulic roller cam?
What sort of stall speed should I select to go with this cam?
Lots of questions I know, but everyone's efforts on the forum very much appreciated.
Thank you
Craig
What sort of stall speed should I select to go with this cam?
Lots of questions I know, but everyone's efforts on the forum very much appreciated.
Thank you
Craig
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Joined: Aug 2001
Posts: 4,270
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From: Delaware
With about 400 ft-lbs torque @ 2000 RPM, I think that a stall speed of 2000 RPM will be fine.
Check with your tranny builder. The first Crane cam suggested 3000 RPM, but that was for a 351C with a 3.5" stroke. A 434 with a 4.25" stroke will not need that high of a stall speed.
Check with your tranny builder. The first Crane cam suggested 3000 RPM, but that was for a 351C with a 3.5" stroke. A 434 with a 4.25" stroke will not need that high of a stall speed.
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