Model Forum / Radio Controlled / Air Models / July 2004

If I recall my G-38, that's correct, especially for the 18" prop.  That's a not
a big load for that engine.

Dr.1 Driver
"There's a Hun in the sun!"

My experience says to have the hi-speed needle at 1 1/4 turns open...not 1/4.
Mitch

I'm having a devil of a time setting the high speed needle valve on a used
Zenoah G-38 that I got from a friend.  The engine has not been smacked but
the
carburetor sedttings have been messed with.  The instruction manual call for
0~1/4 turn for the high end and 1-1/4 rotation for the low end.  The low end
idle seems about right but is that a typo in the manual for the high end?
All
the experts in the club said that I should start at 2 turns open for the
high
end but this seems extremely rich even though the engine started fairly
easily
when I started it there.  The 0-1/4 turn would seem way too lean.  I'm using
a
Zinger 18/ 6-10 prop  which seems to be adequate power for for this engine.
My
only other experience with the larger gas engines is with a Fox (Sachs) 41cc
engine which has run fabulously out of the box with no fiddling with the
needle
valves.  So any suggestions are welcome at this point before all my brown
hair
turns gray.
Joe L.
=========================

According to Horizon's site, you're a bit under-propped.
Here's the product info link:
http://horizon.hobbyshopnow.com/products/description.asp?prod=ZENE38A
The G-38 is the ideal gas engine for models such as the Midwest Extra 300S,
Cap 232 and Super Stinker, as well as the Lanier Cap 232 and Stinger 120,
where sport performance is desired. It is also a popular choice for many
scale projects. It will turn an 18 x 10 prop at 7100 to 7400 rpm.

The manual you have must contain a misprint.  Here's a direct link to the
current one:
http://horizon.hobbyshopnow.com/ProdInfo/Files/zenoahengines-manual.pdf

On page 6 of 24:
3. Standard settings of each needle is as follows:
a. Low-Speed Needle: 1-1/8 plus/minus 1/4
b. High-Speed Needle: 1-3/8 plus/minus 1/4

Prop chart page 12 of 24
G26A 16x8 @ 8,700
G38 Gas 18x10 @ 7,300
G45 Gas 20x10 @ 7,200
G62 Gas 22x10 @ 7,200
GT80 Gas 22x12 @ 7,200   24x10 @ 7,200

I'm having a devil of a time setting the high speed needle valve on a used
Zenoah G-38 that I got from a friend.  The engine has not been smacked but
the
carburetor sedttings have been messed with.  The instruction manual call for
0~1/4 turn for the high end and 1-1/4 rotation for the low end.  The low end
idle seems about right but is that a typo in the manual for the high end?
All
the experts in the club said that I should start at 2 turns open for the
high
end but this seems extremely rich even though the engine started fairly
easily
when I started it there.  The 0-1/4 turn would seem way too lean.  I'm using
a
Zinger 18/ 6-10 prop  which seems to be adequate power for for this engine.
My
only other experience with the larger gas engines is with a Fox (Sachs) 41cc
engine which has run fabulously out of the box with no fiddling with the
needle
valves.  So any suggestions are welcome at this point before all my brown
hair
turns gray.
Joe L.
=========================

According to Horizon's site, you're a bit under-propped.
Here's the product info link:
http://horizon.hobbyshopnow.com/products/description.asp?prod=ZENE38A
The G-38 is the ideal gas engine for models such as the Midwest Extra 300S,
Cap 232 and Super Stinker, as well as the Lanier Cap 232 and Stinger 120,
where sport performance is desired. It is also a popular choice for many
scale projects. It will turn an 18 x 10 prop at 7100 to 7400 rpm.

The manual you have must contain a misprint.  Here's a direct link to the
current one:
http://horizon.hobbyshopnow.com/ProdInfo/Files/zenoahengines-manual.pdf

On page 6 of 24:
3. Standard settings of each needle is as follows:
a. Low-Speed Needle: 1-1/8 plus/minus 1/4
b. High-Speed Needle: 1-3/8 plus/minus 1/4

Prop chart page 12 of 24
G26A 16x8 @ 8,700
G38 Gas 18x10 @ 7,300
G45 Gas 20x10 @ 7,200
G62 Gas 22x10 @ 7,200
GT80 Gas 22x12 @ 7,200   24x10 @ 7,200