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cam profile for optimum smoothness
https://slantsix.org/forum/viewtopic.php?t=8366		 Page 1 of 1
Author:  steponmebbbboom [ Mon Feb 09, 2004 7:51 pm ]
Post subject:  cam profile for optimum smoothness
Can anyone suggest cam specs for a cam that will noticeably improve smoothness of the engine throughout the stock RPM range without sacrificing horsepower? This is on a 225 super six, dynamically balanced with very mild porting (head blended to new seats). No horsepower gain is required.
Author:  SlantSixDan [ Sun Feb 15, 2004 8:13 am ]
Post subject: 
Stock or close-to-stock camshafts give very smooth running with a stock or close-to-stock \6...sounds like the real question might be "Why doesn't my engine run smoothly?".

What kind of roughness is it?
Author:  Doctor Dodge [ Sun Feb 15, 2004 9:27 am ]
Post subject: 
The overlap event has a big influance on the smooth idle and low speed torque of an engine. If you ar building a low RPM engine, a short overlap cam is the ticket. It is interesting to note the the early SL6 have a very short overlap cam to begain with, more overlap was added in later years.
DD
http://www.dutra.org/pictures/engine/st ... -specs.jpg
Author:  steponmebbbboom [ Sun Feb 15, 2004 10:06 am ]
Post subject: 
Dan, the goal is to improve on the stock smoothness of the engine. It did have a pounded #2 rod bearing, but it's being rebuilt right now. I haven't done anything to increase hp other than the 2bbl intake, everything has been built to increase durability and smoothness.

Doug, thanks for the specs. I'm guessing these cams all have more or less the same lift? Are they adequate for the flow/velocity I need with the BBD? Is there anything I can do to increase rocker ratio should I need more lift to take advantage of it?

Thanks again, guys... 8)
Author:  SlantSixDan [ Sun Feb 15, 2004 1:46 pm ]
Post subject: 
What I'm saying is that it's tough to improve on the smoothness of a stock 225 *in good running order*. They do not run roughly in stock form unless something is wrong. (Your pounded #2 rod, for instance).

The lift increased as did the overlap and duration over the years. Early cams (to '64) had around 0.370" lift, '65-'70 cams had 0.395 or so, and '71-'80 cams had 0.410 or so. The P4120243 MP cam has 0.436". All of these cams deliver excellent engine smoothness.

I have no experience with non-Chrysler cams.
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