How to dial in a FK89 cam, ## ???

[RMS Boxer Service]

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

[Roman]

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.

[GetBackOnTrack]

Why not do a trial assembly and see where your at?

[RMS Boxer Service]

Roman,
You were right Johannes says 106 degree

Getbackontrack,
I like to know what to aim for. I'll assembly and dial in the cam to Johanns' recommandations.

/R

[Chris Andrews - The Mailman]

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