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Lynn

If I sized = the pulley=20 correct it will be impossible for me to run over 4 pounds. = Normalization=20 to 8k is the goal with maybe 1-2 pounds if temps are good. At that point = I=20 should be equal to a IO540 at same altitude.

Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of=20 Lehanover@aol.com
Sent: Friday, November 02, 2007 9:02=20 AM
To: Rotary motors in aircraft
Subject: = [FlyRotary] Re:=20 MAP port location \

In a message dated 11/2/2007 8:57:23 A.M. Eastern Standard Time,=20 bhughes@qnsi.net writes:

George,

Mazfix and Mazsport are both boosting to 280hp at the = wheels. http://mazfi= x.com.au/perfproducts/rx8_upgrades.html. =20 Pettit Racing is seeing 270+ with 5-8#'s http://www.pettitracin= g.com/rx8/index.htm=20 My goal has always been to match the IO540 at 8000ft and have a = much=20 lighter plane with new engine. No doubt I will be giving up some = HP=20 without the intercooler. One percent for every 10 degrees I = think.=20 If my cooling ducts and exit area work as planned I may add an = intercooler.=20 The goal now is to get the engine started and flying by summer.=20

Bobby

RV10

The power available on a dyno pass lasting 15 seconds tops, is a = long long=20 way from the usable power

for a long climb to altitude in an airplane. The rate of heat = rejection=20 must be huge. This is the downfall of the turbo engine. When coolant = temps go=20 up, sensors back off the timing to prevent detonation.

Detonation is charge temperature dependant. The higher the = temperature the=20 more likely you are to see detonation. No inter-cooler means higher = charge=20 temperatures.

The effective compression ratio of a normally aspirated engine goes = down as=20 RPM goes up because the ability to fully fill the cylinder with mixture = is=20 limited by port open times going down. So ignition timing is just not=20 critical.

Not the case with a boosted engine. Effective compression = ratio can=20 go up with RPM, so, usually

boosted engines have less than 8.5:1 rotors. Starting with 10:1 = rotors and=20 no inter-cooler, limits total boost, and timing control and boost = control=20 must be precise. Perhaps boosting just to maintain sea level performance = would=20 be a less expensive path.........

Apex seals are very hard, and will damage the turbo on the way = out.

Lynn E. Hanover

See what's new at AOL.com=20 and Make AOL Your Homepage.

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