|
|
Russell, you will be on as solid ground as anyone else to simply use the
Atkins "short intake". I've visited with him extensively, visited his shop
and asked every question I could think of, and here's what Dave says and I
believe to be so on intake manifolds:
We have 2 choices: 1) Long tuned manifolds that have more resistance to
mass flow of air, or 2) the short untuned manifold (used by Mazda Racing??)
which gives higher mass flow.
- They both generate about same torque and HP but 2) has less space
problem.
- Dave is a competive racer and is one of those guys with max
experience with rotaries - and he is quite comfortable with the short
manifold.
I'm going to start off with the Atkins short manifold - or one similar that
fits the RX-8 Renesis engine.
David
----- Original Message ----- From: "Russell Duffy" <13brv3@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, April 17, 2004 1:27 PM
Subject: [FlyRotary] intake ideas?
Maybe it's safe to ask this while Ed's away :-)
I'm still thinking of what I'll do for intake #3, and I have to admit that
I
haven't really paid much attention to any of the dynamic tuning topics,
since I didn't figure I could fit the resulting manifold in the cowl. It
just dawned on me that Tracy has a good intake, which fits under his RV-4
cowl. Unfortunately, I don't remember anything about it, and can't find a
picture. Does anyone have a picture that shows Tracy's intake. Actually,
I'd like to see pics of anyone's intake, just to get some ideas.
The current thought is to get the primary injectors back in the block, and
mount the secondary injectors as close as possible. Does anyone know if
the
turbo, and non-turbo injectors are interchangeable? I'm pretty sure they
must fit the same hole in the block, but how about the fuel rails? FWIW,
I
know (all too well) that the connectors are different.
I have to admit, that it's going to be difficult to resist modifying the
short, straight intake that I got from David, and using it with my old TWM
TB. This will give two injectors in the block, and two in the TB. Since
it
will be so short (about 10 inches), it will be far less than ideal, but I
can't say if it will be better or worse than my current intake until I try
it. This is probably the simplest thing to try at the moment. Now that I
think about it, I could probably practically bolt it on, without
modification (to fit under the cowl) to see how it compares with the other
intake in static rpm. Hmmmm....
Thanks,
Rusty (in search of the universal intake)
|
|