Quote:
Originally Posted by cnpeters
....the Sam James cowl needs little exterior finishing from the example I saw today - very smooth. But, in looking at speed and temperature data, with and without the Sam James plenum (sold by a different location in Florida), I have truly seen negligible differences. For me, it is a matter of aesthetics, with the SJ cowl much sexier looking, albeit at the price of more work....
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The James cowl still requires a lot of pin hole filling. I would guess the actual work to fit and prep is equal with the Vans cowl. The Plenum is tougher than straight baffles.
As far as cooling and performance, I will say, cooling can be an issue. But careful sealing and tuning I run as cool as most. Performance I think I am a touch faster than other RV-7's w/parallel valve 360's.
Hard to snap a good pic when doing a full power speed run. I have a 2kt error at this speed so call it 188kts
At cruise speed yesterday I was showing 179KTAS at 8.1gph. (~177actual)
I chose the James Cowl based on looks also. The extended Long Cowl with prop extension is a way to stretch the lines of the sometimes stubby looking side by side RV's. Also chose my paint for the same reason...Longer just looks faster.
