OS .60 FSR engine - trying to find a piston.
03-23-2016, 05:10 AM
#1
Thread Starter
OS .60 FSR engine - trying to find a piston.
I was recently given an OS 60FSR (side of case is only marked SR) ringed engine that has a deformed piston. I'm gonna put new bearings in it and install the new ring supplied with it. However the piston skirt is out of round. I'd hate to shave the OD of the piston down to square it up, so I'm thinking it better to just replace the piston. If anyone has a piston for one of these old gals, I'd buy it.
03-23-2016, 05:50 AM
#3
Thread Starter
Nah, this one is ringed with a chromed steel liner. I'm gonna keep it that way if I can. It came with a brand new piston ring and the liner is in good shape. Otherwise it'll go into the spares drawer to deal with later if parts are found.
I forgot to mention this engine came factory with a backplate mounted Perry pump and Perry carb. I'll probably get a regular backplate and put a different carb on it. The Perry carb is pretty mashed up.
I forgot to mention this engine came factory with a backplate mounted Perry pump and Perry carb. I'll probably get a regular backplate and put a different carb on it. The Perry carb is pretty mashed up.
03-23-2016, 05:32 PM
#5
Thread Starter
I'll drop him a line and see if he has any spares. I've used a couple Perry carbs, but I havent had any issues with them. Being this FSR is a pumper engine, the carb throat is probably big enough to fit my thumb into. Kidding aside, I'll omit the pump and find a carb a little smaller than the pump carb. I have no muffler for it, so I'll use a Jett muffler on it. That is if I can find a round piston for it.
03-24-2016, 03:08 AM
#8
Thread Starter
03-24-2016, 03:20 AM
#9
Thread Starter
The engine did crash and probably why the brass inserts in the carb are all wonky.
Last edited by 1QwkSport2.5r; 03-24-2016 at 03:30 AM.
03-24-2016, 09:34 AM
#11
Although the .61FSR is not the same as the .60FSR, there was an option for a Perry Pump and Carb on both the .60 and .61. See photos. First two are pictures I found online from another one that sold awhile back, last 2 pics are from my engine. (It's been in a bag for over 25 years all disassembled). This isn't a homebrew installation best I can tell. There are lots of pictures of NIB examples of these engines with the Perry "kit".
The engine did crash and probably why the brass inserts in the carb are all wonky.
The engine did crash and probably why the brass inserts in the carb are all wonky.
03-24-2016, 06:23 PM
#12
Thread Starter
I already have an external Perry pump in a box of junk somewhere that's still good. What I would like to do is find the right non-pump carb or another carb that'll fit and replace the backplate with a standard one. I'm not a fan of pumps.
03-24-2016, 06:24 PM
#13
Thread Starter
Fitting the Perry carb and pump to a brand new engine was common among pattern guys at the time. Being that all pattern airplanes had trike gear with retracts forced them to install the fuel tank above the center line of the carb. The Perry setup eliminated startup flooding and gave a little more top end power. As I said before World Engines did not offer the engine with the Perry setup, OS would never have allowed it.
03-24-2016, 09:18 PM
#14
I couldnt say if anyone was doing conversions but the backplates were being manufactured by Perry. I was stocking those conversions for the OS, Rossi and Webra engines. Thery were ordered directly from Perry. I do happen to have a complete OS carb in my parts box. Would it be worth 10 bucks plus shipping to g you?
03-25-2016, 04:06 AM
#15
Thread Starter
I couldnt say if anyone was doing conversions but the backplates were being manufactured by Perry. I was stocking those conversions for the OS, Rossi and Webra engines. Thery were ordered directly from Perry. I do happen to have a complete OS carb in my parts box. Would it be worth 10 bucks plus shipping to g you?
03-25-2016, 04:13 AM
#16
Thread Starter
One other thing I'll add - the rear bearing in the 60FSR is a tough one to find. This is one of the engines with the "OS-160" bearings - 16x30x7. Boca has them under an MR160 number, but they want $18 for one of them. Yikes. (The engine was free, and I'm a cheapskate... LoL. )
I read a thread the other day that stated which parts cross fit between multiple models of engines... I think a backplate from a 60FP fits, or perhaps a 61SF. I'll have to get back to that thread and see what other Pistons fit. I think the run of the 60FSR was a fair bit shorter than the 61FSR.
I read a thread the other day that stated which parts cross fit between multiple models of engines... I think a backplate from a 60FP fits, or perhaps a 61SF. I'll have to get back to that thread and see what other Pistons fit. I think the run of the 60FSR was a fair bit shorter than the 61FSR.
Last edited by 1QwkSport2.5r; 03-25-2016 at 04:16 AM.
03-25-2016, 06:46 AM
#17
My Feedback: (11)
O.S. did offer engines with the Perry Pump and carburetor. Years later, they had an O.S.-made pump/carb system where they licensed the pump technology from Perry (or had Perry make them with the O.S. logo). O.S. made the rear covers and did the installation of the Perry Pump. It was just one of the options they offered.
03-25-2016, 07:38 AM
#20
O.S. did offer engines with the Perry Pump and carburetor. Years later, they had an O.S.-made pump/carb system where they licensed the pump technology from Perry (or had Perry make them with the O.S. logo). O.S. made the rear covers and did the installation of the Perry Pump. It was just one of the options they offered.
I guess I stand corrected, my apologies. Bill, what time frame was that? I worked in two stores during the 1982-1995 time frame and purchased OS engines from both World Engines and then Great Planes and do not recall ever seeing a listing for a Perry equipped engine. As stated I did stock conversions that were purchased directly from Perry.
Also Bill while we have you here, I recently purchased a second hand .61 SXH WC that is in need of a piston ring. When looking up the part number it is the same as the .60-.61 ring that is currently listed on the Tower web site. However when looking at the picture the ring does not have the notches for the retaining pin. I assume that the picture is a generic one and not of the actual ring associated with that part number. It would be a PITA to snap a picture of every single ring Tower sells. Can you verify this foe me please?
Last edited by speedracerntrixie; 03-25-2016 at 07:45 AM.
03-25-2016, 08:20 AM
#21
The Perry pump and carb combination was quite common at the time. I bought mine from Brown's Hobby in NYC. My installation was in a boat where the pump was able to pull fuel from two 12 oz tanks in series.
03-25-2016, 08:28 AM
#22
This is the carb I have, not in perfect shape but functional. I got it with a very abused engine and even after replacing the bearings the engine ran poorly. The original bearings got so bad and someone continued to run the engine. The fit between the crank and the front housing was ruined and the housing would no loner seal so it would not hold a needle setting. I ended up tossing the engine but kept the carb hoping it would fit an MVVS .45, it didn't fit so no need for me to hang on to,it.
03-25-2016, 03:43 PM
#24
The OS SR series of engines is not the same as the OS FSR series of engines
The 61 FSR is a powerful RPM engine ( and came later ) limited to smaller props than some 61's
The SR series is a bit less powerful ,from my experience than FSR
Both engines are very many years old ,so aquiring parts can be an issue and depends a lot on the number of engines of a type , sold to begin with
You might concider putting the money you plan on spending ,into a newer design with more power out put
I did rebuild some older engines years ago ( as you are ) only to be disappointed ,with the power output compared to other engines i was already using ,after running the rebuilt engines
I have two favorite 61 engines ,one is my Webra 61 champion and the OS 61 SF ( long stroke )
, but i mostly fly a 75 OS AX or an ASP 75 with an OS 7D carb installed ,in my 60 size airframes these days
Power can get you out of trouble ,so good to have ,as underpowered is a disasster waiting to happen
The 61 FSR is a powerful RPM engine ( and came later ) limited to smaller props than some 61's
The SR series is a bit less powerful ,from my experience than FSR
Both engines are very many years old ,so aquiring parts can be an issue and depends a lot on the number of engines of a type , sold to begin with
You might concider putting the money you plan on spending ,into a newer design with more power out put
I did rebuild some older engines years ago ( as you are ) only to be disappointed ,with the power output compared to other engines i was already using ,after running the rebuilt engines
I have two favorite 61 engines ,one is my Webra 61 champion and the OS 61 SF ( long stroke )
, but i mostly fly a 75 OS AX or an ASP 75 with an OS 7D carb installed ,in my 60 size airframes these days
Power can get you out of trouble ,so good to have ,as underpowered is a disasster waiting to happen
03-25-2016, 04:23 PM
#25
Thread Starter
The "F" prefix means front induction and the "SR" suffix means Schnürle Ported. Generic model designation, but they're all FSR engines. The .60 FSR isn't as powerful as the .61, maybe. The pumped engines will be stronger due to the larger carburetor. With a stock carb it won't be as powerful. That's pretty much a given. As to whether it's worth working on? Sure is.