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Original Message
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| RE: O.K., Geoff... |
| By Gerry Proctor - 02/25/2003 10:03:07 AM; IP 207.133.188.254 |
You seem to persist in something other than what Crane recommends. I went to their site: http://www.cranecams.com/master/apps/ford44.htm and reviewed the specs for the H-296-2 cam and they try make it plain and simple. They lay it all out in front of God and everybody...even machining the guides.
If you want to use a double spring or a spring set that exceeds Crane's recommendation, you are in dangerous territory. The break-in method for stiff springs is to use either a light break-in spring or rockers with significantly reduced ratio. If you try to break in a cam with a double or triple spring installed, you have a very good chance of wiping a cam lobe.
You do not get better performance from a stiffer spring if you can't make power at the limit of the spring. Once you are spinning the engine past the limitations of the cam, intake, heads, or exhaust you are only making noise. If you check the cam card, Crane will tell you at what point you should expect to experience valve float with their recommended springs. If you experience float at a significantly lower rpm, then you probably have a problem with installed height or retainer height.
These are not the dark ages, Geoff. We no longer speak words like 3/4 race cam and have to trundle through the dark trying to find compatible parts. The cam grinders have quite a bit of experience in putting together a package of parts that are engineered to work together and go to great lengths to share that with the public. The reason for this is to give the non-NASCAR experienced builder the most likely prospect for a good outcome. Crane would like you to have a good experience with their products.
My personal opinion is that your best bet for success is to follow Crane's advice regardless of your opinion of the open and closed pressures.
Hope this helps. |
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