RE: OS -160 conversion
 

And your flying season is August 1-August 2? Just kidding!

Very nice work, well done! I see the rod bearings are what prevents a leaner oil ratio? Are they plain bushings? Can you make a new rod with needle bearings?
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RE: OS -160 conversion
 

Yes it has a brass bushing on the big end of the rod. That is why the higher oil ratios.
I wished I could put some needle bearings and a new crank pin in there, but room is as much of a problem as anything. Timken does show a bearing that just may work, but as one could guess it has been discontinued or never made to start with.
a person has to use a bearing that fits a new crank pin somewhere close to the size range of the original.

RE: OS -160 conversion
 

Hi guys
I got a chance to run the 160 again with the Xoar 18x8 laminated prop.
I did loose a few RPM as compaired to the 18x6 Wide but it stabled out at 7800 solid and a stable idle at 1650 which is plenty good enough for me.
I willl have to tack my DLE-30 I use the same prop on it, for the life of me I can't remember the numbers I got from it, but i'm sure it was not over 8K but I may be wrong.
The 160 engine really needs to warm up good and I don't think the ring is completly broken in yet, because when hand starting it, it will pop with my finger over the carb to choke it and that seems to flood it, again the low end may be a tad rich still. It needed the starter to actually fire it up and go on the first run of the day after that it flip starts fine especially after it warms up to temp. Maybe someone could shed some light on that.
I have not measured the temp, I feel it's a waste of time in most cases, but I can touch it and of course it's hot but not hot enough to cause any issues. When I get the engine in the plane where I have better control of the gas linkage and some air time I will know more about the cold start ups.
I feel running a Gas engine on a stand isn't really the thing to do, I'd rather have the cooling effects of the air rushing over it in the air to help keep things cooler. *L* I got into it once with the glow guys cause I said about the same thing and I got all sorts of flak from them about it. Sorry but I will go to my grave still fully believeing that any air cooled engine (GLOW or GAS will run cooler in thr air than on the bench. I dunno maybe I'm all wet here but thats what I think.

Doug You said your engine was turning the same size prop at 8-8200 on glow fuel an at a much lower Altitude.
So I am very happy with what I am getting on gas, as I said earlier I knew I would suffer some loss but it's not as great as what I thought it would be. But I gained instant spool up on gas even with the 18x8. On glow fuel it took it a while to get on top with any 18 inch prop. I have seen two props with the same numbers on them bought the same day and won't spin the same RPM's, maybe not a great deal more but some.
Maybe if I can ever get my son to lite I will make a short vid of it running and the tack results.
BTW I used 2 tacks and they was both reading the same RPM.
Richard.

RE: OS -160 conversion
 

Good stuff.

RE: OS -160 conversion
 

Looks good.

Has anyone tried doing a Saito 180, I have one and thought it might be fun to try.

Was just wondering what size carb I should use.

Milton

RE: OS -160 conversion
 

Walbro WT-456 carb made for four strokes with a return spring on the pump diaphragm

RE: OS -160 conversion
 

Just so happens there is a Saito 180 conversion going on at this very moment. http://www.rcuniverse.com/forum/m_10332664/tm.htm
I think all the info a person will need is in that thread.

RE: OS -160 conversion
 

The Saito 180 four stroke glow engine is a good candidate for conversion. There are a lot of them out there and they can use a lot of glow fuel.

RE: OS -160 conversion
 

Thanks for the link, Big help on my decision to give it a try.

Found a WT-456 carb here for about $36.00, Does not sound like a bad price and should be better than using stock carb.
http://tewarehouse.com/WT-456-1
Just have to make a carb adapter for it.

Going to use a Rcexl ignition and try to mount the sensor direct on the engine and not have to use a timing ring and new prop hub. ????

Milton

RE: OS -160 conversion
 

Milton, They will run pretty good on the stock carb. Try that first just so you know the difference with the Walbro

http://www.rcuniverse.com/forum/m_9313390/tm.htm

RE: OS -160 conversion
 

Cyber have you looked at Garlock bearing material.

RE: OS -160 conversion
 

I will try both, Just like the idea of a pump on the carb so i don't have to worry about tank location.

I have used a clines regulator but do not thin it is a good idea to use muffler pressure from muffler on gas engines

Milton

RE: OS -160 conversion
 

Those 456,s are pretty small,I lost 300-400 rpm on 15cc gas,but it ran good to 9100,usual 9500 w/9.5mm carb,good luck.

RE: OS -160 conversion
 

Milton, you need to see how the WT-456 is different from a 2 stroke Walbro and you can change a larger one to make it like the WT-456 pump assembly.

RE: OS -160 conversion
 

What a lot of good information in the links provided, Anything form valve lubrication to oil mix and carbs.

My head is spinning right now and trying to figure it all out.

Hopefully I will figure it all out from people that have tried it and come up with a good conversion.

Thanks
Milton

RE: OS -160 conversion
 

Hi Terry
Garlock bearing material ??? I have used garlock plate before to make insulators, reed blocks and fixtures, but don't ever recall trying it for a bearing, although as tough as the stuff is it just may work good. That is if were on the same page.
If not throw me a link.

RE: OS -160 conversion
 

www.ggbearings.com
Do a search on site for dp31.
Garlock not Garolite

RE: OS -160 conversion
 

Interesting reading especially the PDF file

I didn't find any Garlock on that site but the Gar Max and Gar Fil were interesting.

RE: OS -160 conversion
 

GGB= Glacier Garlock Bearings, we have always called the PTFE impregneted bronze bushings garlock. Seems that now there other types.

RE: OS -160 conversion
 

Have you actually flown a plane with the converted OS, turning the props you are bench running? You may want to let the performance in the air guide you in your choices.

Also, if you want more out of the engine, you may want to use a tuned exhaust.......

Have you guys tried running Avgas in the OS conversion?

Very nice work on the conversion. You've given me ideas on converting my 9 year old OS 160. It has sat unused for more than 5 years now; a total overhaul makes more sense than just returning it to glow service.

RE: OS -160 conversion
 

Are you actually using the porous bronze/Teflon impregnated bushings now in a gasoline model engine?

RE: OS -160 conversion
 

Long ago we converted 2 ST3000 to Garlock bearings. One lasted about 50 hr, the other was crashed after about 5 hr and the engine was destroyed. I can't remember which formula bearing we used.

RE: OS -160 conversion
 

Thanks for the info. Years ago, I did a lot of business with Garlock in a different application than this one. Garlock had some expertise in PTFE processing.

PTFE doesn't work well in compression; it tends to push out of the way, and in this case anyway, the porous bronze would have made direct contact. 50 hours is about 200 flights give or take, or about a season of flying. Reasonable performance for PTFE in a load bearing application.

RE: OS -160 conversion
 

Have you actually flown a plane with the converted OS, turning the props you are bench running? You may want to let the performance in the air guide you in your choices.

Also, if you want more out of the engine, you may want to use a tuned exhaust.......

Have you guys tried running Avgas in the OS conversion?

Very nice work on the conversion. You've given me ideas on converting my 9 year old OS 160. It has sat unused for more than 5 years now; a total overhaul makes more sense than just returning it to glow service.

I myself have not flown a plane with the converted engine in it yet, but from reading another thread Corona Bob has flown his and really likes the outcome of it.

Its still a shade on the cool side plus there some white stuff still on the ground here to fly as of yet. It didn't used to bother me much I flew all year long, but anymore the cold gets to my back big time and fairly well ruins my day.

I know what you mean about prop size to fit the plane and flying style of a person so that is yet to really be determined on my end. I know before on glow I was not at all happy with an 18" anything prop on the 160 due to the slow throttle response time and the type of flying I do. I don't see that at all with the gas conversion throttle response is instant with the 18 inch props I have bench ran.
I'm not even useing the correct muffler for the 160 so my RPM's and transistion may differ when I get the engine installed, for the better I hope.
I myself don't use AvGas, but that is all one of my flying friends uses mainly because of the gas smell, as far as I know most if not all of his engines are stock compression raito and do not need the extra octane in the gas for detonation reasons.
A tuned pipe i'm sure would inhance the performance of the engine, but in my case it would require alot of mods to make one fit in the plane, and really is not feasible to do.

RE: OS -160 conversion
 

Hi Terry I got busy and didn't get back with you on the Garlock bearings, no I have not used them but they do look interesting. 50 Hrs of run time and it was shot or is that when you took it down to inspect things and also at what oil ratio did you use?
PTFE or Teflon as most folks know it, is not very stable and does make me wonder just how good it would be in an heated inviroment. However it is slick and wears like iron only better providing you can keep it in the required specs needed.