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Title: How to dial in a FK89 cam, ## ??? Post by: RMS Boxer Service on May 12, 2008, 09:22:31 am Hi all,
I'm helping a friend building a 86X101.6 mm Oxyboxer engine with JPM heads for his 64 drag racing sedan and need a little help. My question is, should I mount it sraight up or retarded/advanced a few degrees?? I have searched both this site and the shoptalkforum without finding an answer. What did you guys do when installed your FK89 cams?? /R Title: Re: How to dial in a FK89 cam, ## ??? Post by: Roman on May 12, 2008, 16:37:49 pm Why don't you ask JPM? The reason you won't find any info is that there is very few JPM 4" heads out there, I had the very first in a running engine and that was exactly a year ago. My guess is that he tells you to set it at 106 degrees.
Title: Re: How to dial in a FK89 cam, ## ??? Post by: GetBackOnTrack on May 13, 2008, 15:24:53 pm Why not do a trial assembly and see where your at?
Title: Re: How to dial in a FK89 cam, ## ??? Post by: RMS Boxer Service on May 13, 2008, 20:37:58 pm Roman,
You were right :) Johannes says 106 degree ;D Getbackontrack, I like to know what to aim for. I'll assembly and dial in the cam to Johanns' recommandations. /R Title: Re: How to dial in a FK89 cam, ## ??? Post by: Chris Andrews - The Mailman on May 15, 2008, 02:30:32 am Hi all, I'm helping a friend building a 86X101.6 mm Oxyboxer engine with JPM heads for his 64 drag racing sedan and need a little help. My question is, should I mount it sraight up or retarded/advanced a few degrees?? I have searched both this site and the shoptalkforum without finding an answer. What did you guys do when installed your FK89 cams?? /R Dialing in your cam depends on the camshaft's actual lobe separation (lobe center). It is assumed that you have a standard Engle FK-89 with 108° lobe centers. Years ago, I was scolded by a cam grinder, that I needed to run my cam intake lobe centerline at 104°. Being naive I reluctantly obliged and set the cam 4° advanced. What I am attempting to convey is, one does not know for certain what the engine requires until it is run on a dynometer and the torque and horsepower verses RPM is measured. Then you can make adjustments to the camshaft to optimize the power band. Have fun. Chris Andrews - The Mailman |