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| One more question to throw into the mix. A friend is building a Cozy and has 13B short block, currently believed to be fresh though compression and leak down tests remain to be done. He is now thinking to go turbo instead of tearing it down to go P-port. Is it true that there is no intake runner tuning for a turbo setup? Yes it is more complicated to go turbo (than peripheral), but there is also the advantages at altitude.
So the extra question is: P-port or turbo?
Christian, While you are doing that, you could also
include some info on your pporting of the Renesis. How did you know where
to bore the holes for proper timing and how did you seal the water
jacket? I assume that you just plugged up the original ports with JB weld
or something? Thanks, One of the other Bills
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Wednesday, October 07, 2015
9:04 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: To P or
not...
can you give details
on your custom built hotdog with inox? baffling.
Sent: Tuesday, October 06,
2015 11:08 PM
Subject:
[FlyRotary] Re: To P or not...
I would agree, yes it
worked out to be allot more simpler running 2 x 2" runners than playing
with 4 in my opinion and easier to manufactur etc
From modifying my
engine from a not so good 6 port intake to a simple 2 port intake I gained a
good 30-40 hp and 15 k top end
The noise also isn't
that bad on my renises as I've attached a custom built hotdog underneath with
inox baffling which works well
Trying to ensure I
have a complete knowledge before I make my decision,
The P port as shown
for the website is exactly what we are looking for. Straight forward power at
high rpm. The noise is a factor of energy output which is the same.
If I tune a 4 port
runner system and get x amount of air into the engine I give y amount of fuel
and I have z amount of power and engine exhaust/noise to handle.
If I use a P port and
get x amount of air and give y amount of fuel it is the exact same z
output. It was just easier to get x amount of air into the system.
Or am I completely off
base.
Bob,
One thing that everyone should get clear is that for aircraft PPorts are almost
always superior. At higher RPMs. Also Pports will idle just fine. Good balance
and vibration control are the key to good idle. The engine won't make a lot of
power at low rpm but that isn't a problem for an aircraft. The rotary makes a
better aircraft engine than a car engine! Bill Jepson
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