Io-540

[bocefus]

Das is correct a mingo and the displacement of the TIGO-541 is exactly the same. This is why there are no hard and fast rules concerning the - number always indicating the displacement although it does in 99.98 percent of the applications.

 

[Flyin Tony]

What about the IO??

 

[TrafficInSight]

Any particular reason they had to break the whole system instead of just designating it with a suffix?

Tendency toward chaos?

actually I think it's because an integral accessory drive would mean the case is completely different from the other models, in essence it's a whole different engine, although still 541cid. The other dash number engines would share common major parts usually.

 

[belchfire]

What about the IO??

O =opposed Ie flat cylender layout
R= radial (R-985)
L=(if closest to the displacement) means
inline, if at the beginning indicates left
hand engine rotation
I= fuel injection
T=turbonormalized
TS=turbo-supercharged
G=gear reduction
S=internal gear-driven supercharger
V=vee-type cylender layout
A or AE denotes aerobatic

So your IO means "fuel injected, opposed"...
then there is TCM's (explative deleted)
GTSIO-520...geared, turbosupercharged,
injected, opposed.

As a general rule, the more letters in front
of the displacement, the farther you want to
stay away from it!

 

[bocefus]

H= Helicopter

 

[belchfire]

Any particular reason they had to break the whole system instead of just designating it with a suffix?

I am not certain (never been around them) but
there are some of the 540's that have the
intake and exhaust on opposite sides of the
cylender and can use upward
cooling air flow rather than downward...again
not sure but these may be the "541" engines.
If this is the case, using the 541 designation
is reasonable because of the change in
basic cylender design. Most oppossed engines
have the intake and exhaust on the same
(bottom) side of the cylender.

Case changes are usually indicated in the
suffix, like the O-320-H2AD that was used
in 172's, most of which have been replaced
by O-320-A series engines.

 

[bocefus]

Yep, one would be the TI0-541, but your supposition does not hold true. These engines are known as "upstack" and "downstack" Mostly used in ground power units.

 

[crash-proof]

H= Helicopter

Actually, it's "V" as in Vertical, for choppers
Ex: VO-540

 

[bocefus]

Er, no, actually it is V, or H. both for helicopters.
Ex: HO-360, HIO-540, TVO-435 and so on

 

[TrafficInSight]

V is for vertically mounted, and I believe all H means is that it's equipped with a cooling fan for helicopter use and possibly a different type of flange to mate with the belt pullies, may be wrong on that but it's been the only thing I've noticed different so far. So you can have a VIO-540 or an HIO-540, the V usually implies H but it doesn't have to.