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Got the new prop back from fine tuning and
finishing and I'll Say that Clark Lydick of Performance propellers knows what he
is doing. I asked for 100 rpm increase (285 rpm for the engine) on the
prop. The prop is now 74x88 vice the 76x88 I flew with. It performed just
fine, but wanted a bet more rpm for take off.
I bolted the prop on this AM and fired up the
engine, after warm up I advanced the throttle and hit a bit over 6000 rpm static
- just what I ordered. Taking the fuel flow reading (15.75 GPH)and the rpm
and it calculates out to 180HP on the nose. Unfortunately IMC here so no
flying today - perhaps tomorrow to see what the top end is. Then I have
intake manifold #6 ready to slap on and see what it does.
Photos of #6 intake attached. Used the
Featherlight two part Polyurethane casting plastic to make the throttle body
mount. Tubes slide in tubes and are ground adjustable. I figure I'll
need to adjust it twice a flying season once for cool air and once for warm
air. As some of you may recall I tried an air adjustable version - but,
just too many compromises on the airflow in order to get the
inflight adjustment mechanism to work. So decided it was probably not worth
the trouble and weight when I can simply adjust the length once or twice a
year.
Total weight of what you see in the photo is 6 lbs
3 oz. Not too bad considering the Mazda throttle body (which I am
currently using weighs 5 lbs by itself). I also removed the two secondary
injector port bosses that stick out in tube in the lower casting and smooth it
to one continuos diameter - which should help airflow a bit. Upper
tubes slide over lower tubes (clamp is to keep the vibration and manifold
"vacuum" from sucking them down. The Throttle body is a 65 mm Mustang
which weighs approx 8 oz and cost me $25 on ebay.
I will probably have it on when I fly to Sun &
Fun ( assuming it lives up to expectations of course).
Ed
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