andre

I operate off an airfield with a ground elevation of 5327 feet ASL.
Obviously my engine (VW 1835cc with Zenith Carb) feels the altitude
somewhat.
I am thinking....
Would Turbo charging help?
What about an electric blower to increase manifold pressure maybe?
Or how about a NOS system?

bart d. hull

Andre,

I believe turbo-charging is a good solution to your problem. I have
specifically looked into altitude compensation with my system that
I have setup on my Subaru 2.2l.

I have seen the electric blowers on EBAY but I don't believe you will
see the pressure that is developed with a turbo.

Considerations with a turbo setup.

1. Additional weight
2. How much boost? (Too much and you will ping your engine to death.)
3. How to add additional fuel to match boost (IE EFI system or carb)
4 If your using a carb are you going to use a blow through or ****
through system.
5. Timing may need to be reduced dependant on boost to avoid ping.
6. Waste gate or pop-off valve to limit boost.

--
Bart D. Hull
bdhull@inficad.com
Tempe,Arizona

Check http://www.inficad.com/~bdhull/engine.html for my Subaru Engine
Conversion
Check http://www.inficad.com/~bdhull/fuselage.html for Tango II I'm
building.

clare @ snyder.on

How about a gasoline powered leaf blower? Pull the rope for "boost on
demand"

roger halstead

Ram air is not effective at low speeds.


Just somewhat?? <:-))

Probably turbonormalizing...It's not as hard on the engine and would
give you take off power at 5300. With a carb it get a bit
complicated as the carb needs to be in a pressure box.


Not familiar with them.


NOS needs a rather healthy mixture to begin with (As I recall it helps
with cooling)...I'm not sure about the higher altitude effects.

Roger Halstead (K8RI EN73 & ARRL Life Member)
http://www.rogerhalstead.com
N833R World's oldest Debonair? (S# CD-2)

paul millner

with cooling)...

NOS adds a bunch of heat to the engine, so no, it doesn't help with cooling.
Basically, it's a safer way to add oxygen to the incoming air than injecting
oxygen directly... so since the incoming air is now much more oxygen rich,
you need a bunch more fuel, or your mixture will go very lean. In that
sense, it's an alternative to turbocharging... but the NOS bottle will last
a minute or so, OK for one takeoff... then what? :-)

Paul, turbo Cardinal mode

paul millner

Sure, 'cause you'll get the leverage of all the extra HP the air starved
engine can make... and leverage is the name of the game! :-)

Paul

paul millner

complicated as the carb needs to be in a pressure box.


No pressure box required for Marvel Schebler / Precision Airmotive carbs...
just installation of a third throttle shaft seal (did it on my Cardinal when
I turbonormalized it).

Paul

morgans

So you think the leaf blower idea would be about as effective at increasing
HP, as farting into the carb for the methane content?

You may have a point. Anyone have some pressure gauge that could measure
the small amounts of boost at the business end of a leaf blower? I would be
curious to see what good one would do.

Didn't a guy use a two cycle engine setup to boost his engine for a race
lately? What kind of deal did he use?
--
Jim in NC

rich s.

Actually, two things came to mind.
1. Using the leaf blower to:
a. burn gasoline to
b. turn a fan to
c. blow air into another engine to:
d. burn gasoline to
e. turn a fan to
f. produce thrust
Seems somewhat inefficient. If the leaf blower simply uses its horsepower to
add the thrust, it cuts out steps c, d, & e.

2. The leaf blower would be suffering the same anoxia as the main
powerplant. Perhaps one could use a Cox .049 to increase its manifold
pressure? ;o)

"Great fleas have little fleas upon their backs to bite 'em.
And little fleas have lesser fleas, and so ad infinitum."

Rich S.

clare @ snyder.on

The weedeater Barracuda is rated at 370 cfm.
It will produce boost up to just below that point.