Author Topic: Thinking about getting bigger cam??  (Read 118463 times)

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Gnarly4X

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Re: Thinking about getting bigger cam??
« Reply #270 on: May 23, 2017, 04:39:20 AM »
My thinking was that you seemed to be highly reliant on the software for your cam selection, and in the rpm range you were interested in I've always seen dips in the torque curve on 'real' tests.

If the software you were using didn't show dips (desktop dyno doesn't seem to be good enough to show dips) you could easily pick the wrong cam.

Hi emsvitil,

I'm not highly reliant on the DD data.  It looks optimistic.  The gains that it shows are disputed by at least one 22RE engine builder.  I just have owner feedback - which obviously varies, and the published claims.  But in the absence of any "real world" test data, I'm just looking at what is predicted in the "changes" to cam profiles.  I fully understand it may NOT be accurate.  I will not be surprised if an actual dyno test shows dips in the curve.  I "feel" some dip in the pull when I tach my engine to 5,000 RPM.

Gnarls.

1986 XtraCab SR5 22RE 5speed W56B, ~16,000 MI after break-in, DIM (Did It Myself) rebuilt engine - .020" over, engnbldr RV head, OS valves, 261C cam, DT Header. https://imgur.com/oACTHTR

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