Engine Weight Question

[Dave Driscoll]

I'm curious as the weights and HP of some of the common homebuilt
powerplants (lycomming, rotax, auto conversion, etc.) If possible I
would like to get an installed weight (ie throttle control, starter,
raditor, etc.). Any information would be greatly appreciated.

Thanks,

Dave Driscoll
dris...@execpc.com

[Bruce A. Frank]

Ford 3.8L V-6 , FWF including water in the radiator and oil in the crank
case,~430 lbs. which is about 30 lbs more than the real weight of the FWF
of an 0-320 Lyc. setup(C-172).
--
Bruce A. Frank, "Ford 3.8L Engine and V-6 STOL
BAF...@worldnet.att.net Homebuilt Aircraft Newsletter"

*--------------------------------**----*
                 \(-o-)/ AIRCRAFT PROJECTS CO.
                  \___/
                  / \
                 O O

[Gregory R. Travis]

"Bruce A. Frank" <BAF...@worldnet.att.net> writes:

>Ford 3.8L V-6 , FWF including water in the radiator and oil in the crank
>case,~430 lbs. which is about 30 lbs more than the real weight of the FWF
>of an 0-320 Lyc. setup(C-172).

Bruce,

I'll be the first to admit it - I've never weighed a full FWF O-320
about to go into a 172. However, Lycoming lists the following FWF
weights for the O-320 as going into the C-172:

O-320-E2D 268 lbs (C172I-M) (1968 on)
O-320-H2AD 283 lbs (C172N) (1977 on)
O-320-D2J 275 lbs (C172P) (1981 on)

Lycoming CLAIMS that their dry weights (the weights above) include the
carburetor, magnetos, spark plugs, ignition wires, intercylinder baffles,
tach drive, starter, and alternator. And, of course, the engine itself.

That leaves, by my count, oil, oil cooler, oil cooler hoses, and the
cooling airbox and induction airbox for the complete FWF package.

Are you saying that either:

1. The "missing" stuff I listed above weighs something like 120
lbs? Oil for the -E2D and -D2J (2 gallon sumps each) would be,
what, about 16LBS? Oil for the -H2AD (1.5 gallon sump) would be
12LBS. So that means that the oil cooler, oil cooler hoses, and
the cooling baffling are something like 100LBS?

-or-

2. Lycoming should die like the lying bastards they are?

greg in "Umm, I'm about 200LBS give or take a few, really" mode
--

greg gr...@indiana.edu http://gtravis.ucs.indiana.edu/

[Bruce A. Frank]

Greg,

I stood and watched as the 160 hp, 0-320 was unbolted at the firewall and
placed on the scales- all the baffles, hoses and other bits and pieces
stacked on with it. The shipping scales stopped at 390 lbs as I look at
my notes- so my statement should have been 40 lbs.

But I have seen other installations weighed which were as low as 365 lbs
for the Lyc. and Fords with more effort at weight savings top out at 410
lbs. I have not watched the scales myself but I've been told that an
0-360 conversion in a 172- was within 10 lbs of the Ford.

Did you see the Contact! article about the Chevy aluminum block 350
installed in a 172 which weighed only 40 lbs more than the 0-360 the guy
had removed but put out 300hp? Now there's a rocket.

[Dennis Jackson]

Dave Driscoll wrote:
>
> I'm curious as the weights and HP of some of the common homebuilt
> powerplants (lycomming, rotax, auto conversion, etc.) If possible I
> would like to get an installed weight (ie throttle control, starter,
> raditor, etc.). Any information would be greatly appreciated.
>
> Thanks,
>
> Dave Driscoll
> dris...@execpc.com

Try this:
http://gtravis.ucs.indiana.edu/Engines/

Lots of good refs.

DJ

[Gregory R. Travis]

cri...@polarnet.com writes:

>Recognizing that all scales are not created equal -this is what my O-320
>D2J weighed as I installed it on my 2 + 2. Weight was determined by a
>large spring scale as engine was picked up with my engine crane.

>321 lbs which included -
>baffles, engine mount, oil hoses, alternator, starter, (both lightwt.),
>Ellison TB, air box (alum.), starter ring gear, alternator belt, mags,
>plugs, harness, oil thermostat, oil cooler, s.s. crossover exhaust with
>very light wt. mufflers, heat muffs

Very interesting. Lycoming's published weight for that engine is 275lbs
which includes everything you listed above except the following:

1. Exhaust
2. Mufflers
3. Heat muffs
4. Air box
5. Oil cooler
6. Engine mount
7. Oil hoses
8. Baffling

Does anyone think it's reasonable to believe that those eight items
weigh a total of 46 lbs?

A Cessna 172RG manual that I have right here lists the weight of the
O-360-F1A6 installation as 317.7 lbs. This includes those things
normally included in the engine "dry weight" (mags, starter, alternator,
etc.) plus the airbox and air filter. I think that ALSO includes the baffling
and oil cooler and hardware since they're not listed anywhere else in the
w&b total. Lycoming's dry weight for the O-360-F1A6 is 300 lbs.

I'll check Cessna's listed weight of my old O-320-H engine back when that
was what powered my 172 when I get out to the airport tomorrow.

>for what its worth.

indeed.

greg

[cri...@polarnet.com]

Recognizing that all scales are not created equal -this is what my O-320
D2J weighed as I installed it on my 2 + 2. Weight was determined by a
large spring scale as engine was picked up with my engine crane.

321 lbs which included -
baffles, engine mount, oil hoses, alternator, starter, (both lightwt.),
Ellison TB, air box (alum.), starter ring gear, alternator belt, mags,
plugs, harness, oil thermostat, oil cooler, s.s. crossover exhaust with
very light wt. mufflers, heat muffs

for what its worth.
rtc