> > Paul what would happen if I used round aluminum spheres like these
> > > as knuckles to get my intake runners closer to the engine. My intake
> > > manifold is the Racing Beat 6 port manifold it's a little on the high
> > > side I think I may not have to much of a problem as I'm building a
> > > Long Ez and I think I'll have room if i need to make the runners a
> > > little higher.
> > >
> > > Anytime you force the air to make a sharp right angle you loose
> > > big time. Are you using the Weber carb it is designed for or
> > > EFI? If EFI I would lengthen it and go straight up through the
> > > cowl with a ram air scoop on top like most race cars use.
> > > That manifold is designed for 9 or 10 thousand RPM.
> > > --
> > > Paul Lamar ...No rotor no motor.
> >
> > > paul
> > >
> > > Thanks for the rendering I've always wanted one of those.
> > > Did you use Rhino? If so could you send me the file? Also,
> > > what are the dimensions of that formula one style intake.
> > > I would like to make a couple. I have some pretty good ideas.
> > > I think I can turn the blank on my Lathe, and then lay up some
> > > glass over it.
> > >
> > > Tony
> > >
> > > If you can stand the ugly factor make the runners 24 to 28 inches
> > > from side port to trumpet mouth :) The butterfly throttle can be in
> > > the air scoop cum plenum. The opening should be about 3 inches
> > > in diameter. The native Rhino file is too big to email.
> > >
> > > Paul Lamar ...No rotor no motor.
> >
> >
> > Well that's just it. I really don't want ugly per say. I like the
> > function aspect of it no doubt, but your right it is ugly. there
> > must be a better way to skin this cat to get the same results.
> > How much BHP will I see in this configuration as opposed to say
> > something like mistrals intake? What I'm trying to get at is, to
> > have form and function. How much HP will I loose from the form
> > aspect of the intake? Lets say for argument sake that in this
> > configuration I get 190hp but if I go over the top, or make a
> > SLIGHT bend in the intake to keep it below the cowling I may
> > only get 180hp, which would be o.k. for a long EZ. I think ; ) .
> > do I have to have the runners that length what happens if I cut
> > 3 or 4 in off? where is the runner length on these renderings?
> >
> > Tony
> >
> > ----------------------------------------------------------
> >
> > The 24 to 28 inch runner length is center line of the pipe
> > from the side port to the trumpet.
> >
> > Give me some dimensions. Straight up from the front and rear
> > RB intake manifold flange to the cowl surface. And straight up from
> > the top of each rotor housing to the cowl surface.
> >
> > Then place a long carpenters level on the RB intake manifold flange
> > and see if it clears the top of the rotor housing. If so give me
> > the dimension from the bottom of the level to the top of the
> > rotor housing.
> >
> > You won't get as much power at 6500 RPM as the Mistral manifold has
> > been carefully developed on the dyno for peak power at 6500 RPM
> > or so. My guess is you will get somewhere between 175 and 185 HP
> > at around 6500 RPM. Maybe Jim Medere can tell us what the
> > stock Weber gives at 6500 RPM with the stock 6 port man length.
> > Are you street porting your six port? Are you using the 2.85:1
> > gear or the 2.17:1 gear? If the 2.85:1 gear you can go up to
> > 7500 RPM use shorter runners and get more HP.
> >
> >Paul
>
> I don't have any dimensions available from the flange to the top of
> the cowling as i'm not that far into my build. I didn't plan on using
> the stock cowlings anyway, I was just simply going to make my own so
> I can toy around wiht the dimensions. Maybe you can just figure it on
> the stock cowling as a starting point. I'm not street porting my
> engine, I do have brand new turbo [rotor] housing on it though but I'm
> keeping it N/A for weight and simplicity. I plan on using the 2.85:1
> redrive. I would like as much power out of this thing as possible.
>
> What I'm looking for mostly is reliability, if I have to sacrifice
> some HP for a simpler fuel system that's O.K. also from the top of
> the RB manifold flange to the top of the rotor housing is from what
> I can tell about 1/2in maybe a little less. If I lay the level on
> the flange the bottom of the level touches the top of the rotor
> housing however it's way off level bubble the flange has a slight
> slope to it. If I level the bubble I get just about a 1/2in does
> that make sense? you can clearly see the slope in the flange at
> level bubble.
>
> Tony
>
> Well that is something to go on.
>
> I will see what I can do with the 90 degree bends.
>
> OK This requires two 90 degree two inch tubing bends
> on a three inch center line radius. Based on an overall
> lenght of five inches for your ebay throttle body this
> gives about a twenty inch runner length which is about right
> for 7500 RPM take off.
>
That's it !!!!! that's the system I want to use. Now the question is what do you think the HP will be at 7500 RPM ? and can I get more HP if i use one injector on each throttle body and use the stock
primary location at the port basically the two injectors side by side that everybody plugs the holes for. that gives me the two primaries port injected and my secondaries body injected. Or do I just
use the Ebay throttle bodies with two injectors each?
Tony
Without porting it is not going to be good. I notice racing
beat has discontinued the six port manifold. The Y in the manifold
also does not help the tuning. Any kind of discontinuity like
the Y confuses the air :) I hesitate to guess. You might call
Jim Mederer or Dave Lemon and ask them. The only thing the E-bay EFI
TB is going to buy you is horizontal operation and high altitude
leaning. You will get about the same sea level power as a 48 mm Weber
I suspect.
BTW don't forget to take the pins out of the six port
rotating barrels. One broke loose in Chuck Dunlap's engine and
was ingested into the engine over the Grand Canyon. Luckily he
landed it on a road. Also you will need to port the juncture
of the tubing with the manifold and TB. Two inch OD tubing has
an ID of 1.875" which equals 47.6 mm. Hopefully the manifold
on e-bay EFI TB is made for a 48 mm weber.
--
Paul Lamar ...No rotor no motor.
Paul I did in fact take the pins out as I did remember the
story of the forced landing due to a pin being ingested.
O.k. how about this? The RB manifold has a flange on the top why
not use 2.00 ID tubing and weld a flange to it that mates up to
the RB manifold? This way the tubing wall is on the outside of
the manifold not stuffed down into it.
there is also enough "meat" around the port of the manifold that
I can portmatch the ID of the tubing to the ID of the intake
manifold port, this way you have a true 50mm or larger. Or I
can P-port it and forget the whole thing.
Tony
Do you have a source for two inch ID tubing. I have not been
able to find any for the last 55 years (since I was 16) let alone
get it mandrill bent :)
Who said anything about stuffing tubing down inside?
A 48 mm Weber is 1.889 inches ID. Two inch Outside Diameter
tubing .065 wall is a near perfect match at 1.875 INSIDE DIAMETER.
I fully intended welding two flanges to each two inch OD tube
to mate with the RB manifold and the 48 mm Weber replacement
EFI throttle body.
Paul Lamar ...No rotor no motor.
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