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Joe,
Please read the following old messages. Note that anO-360 weighs about 40 lbs more than an O-320. I also have a post (that I can't find) from Tracy showing that his new Renesis installation weighs 285 lbs (trusting to memory here). I think you can safely plan an identical weight to an O-320 and lighter than an O-360.
Ken Powell
> >BIG SNIP<
>
> There are about a dozen ways to specify engine weight and I don't know which
> way Powersport did it but I would assume that this is Firewall Forward
> weight.
> I have seen 3 examples of FWF weights of Lyc O - 320 installations in
> certified airplanes. The weights were arrived at by actually unbolting
> everything forward of the firewall (not including cowl or prop) and weighing
> it. These were all on Cessnas 172 of various years. I think Lycoming says
> the O - 320 weighs 276 pounds. The actual FWF weights measured were 355,
> 370 & 385.
>
> Moral of the story is that I would not necessarily conclude that the
> Powersport engine weighs about the same as an O - 360. It might, but their
> 326 lb number does not prove it.
>
> Tracy Crook
> tcrook@rotaryaviation.com
> www.rotaryaviation.com
_____________________________________________________________
From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf
of john [frmrjohn@netonecom.net]
Sent: Friday, March 21, 2003 6:38 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] l3B weight
Here are the numbers on my engine, 13B w/Marcotte R-drive.
Redrive 36# 2 rad. 10
engine 170 oil cooler 6
pan 5 wires, hose 10
wtr pmp 7.5 cooler brkt
alt. 7 aluminun plate 8
strtr. 7 between eng &
weber&intk 8.4 pan total 275.4
Wt on balance scale was 276# ready to mount on the engine mount, without
oil, coolant and exhaust manifold. JohnD
_____________________________________________________________
here is a preliminary measurement of an old O-320 and my 13b components- redrive is Tracy's reduction gear unit computer is also Tracy's.
There is probably a miscellaneous 20 lbs of stuff that I haven't thought about yet on the 13B
re
Marko
| Engine Weight Comparison Lycoming O-320 B3B vs. Mazda 13B - all weights are in pounds. |
| Lycoming engine weight |
Mazda 13b engine weight |
|
|
|
|
|
|
126 |
case, crank, oil-pan / screen |
218 |
engine, redrive, crank-sensor |
|
76 |
cylinders |
5 |
oilpan |
|
27 |
pistons, pins, intakes, etc. |
6 |
orig lower intake |
|
5.5 |
flywheel |
10 |
engine computer |
|
3 |
carb |
4 |
engine mount in engine |
| guess |
20 |
mags/plugs |
6 |
steel tubing |
|
|
|
|
|
|
10 |
6" prop extension |
|
|
| engine sub wt |
267.5 |
|
249 |
|
|
3 |
engine mount |
6 |
engine mount |
|
3 |
|
? |
radiator and water |
|
|
|
5.5 |
water pump (racing - reg +2.5) |
|
4 |
oil cooler |
5 |
oil cooler |
|
7.5 |
starter (lite) |
7.5 |
starter |
|
10 |
alternator |
7 |
alterntor(s) |
| guess |
3 |
exhaust |
13.5 |
exhaust (plus piping) |
|
295 |
|
293 |
_____________________________________________________________
rom: "Marko Bewersdorff" <marko@bewersdorff.com>
To: <flyrotary@olsusa.com>
Subject: RE: CG
Date sent: Mon, 15 Apr 2002 08:53:19 -0700
Send reply to: flyrotary@olsusa.com
>>> ^ >> ^ >>>> FlyRotary <<<< ^ << ^ <<<
>>> ! >> ! >>>>>>>>>><<<<<<<<< ! << ! <<<
>>
I have a 6port and a tracy redrive with the 6 gears inside, the CG is
about where the sparkplugs are (rotor near the re-drive) that is
without intake manifold, without alternator and I don;t remeber if
that included the waterpump.
weight wise I have some numbers taken of my engine components
Lycoming O-320 B3B engine weight
76 cylinders
126 case, crank, oilscreen
27 pistons, pins, intakes, etc.
5.5 flywheel
3 carb
20 mags/plugs (guess)
10 prop extension
engine sub wt. 267.5
3 engine mount (long ez)
4 oil cooler
7.5 starter (lite)
10 alternator
3 exhaust (guess)
total 295
mazda 13b engine weight
218 engine, redrive (Tracy), crank-sensor
5 oilpan
6 original lower intake
10 engine computer (Tracy)
4 engine mount in engine (Aluminum Plate)
6 steel tubing for mount
sub total 249
5 oil cooler
5.5 water pump (racing - regular add 2.5 lbs)
13.5 exhaust
total 273
re
Marko
-------------- Original message --------------
> Hi All,
>
> Please tell me how much more a RX-7 that has every thing on it ready to fly,
> water oil and etc., weighs more than a 180 HP Lyc. ( approx ).
>
> Thanks
> Joe
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
|