For those who was looking for small gas engine...here it is. I seen it at Toledo expo. Thanks Capt,n

What company produces it? What size glo engine does it compare to in physical size?

I saw one of these Campagnucci engines in a beat up old RC car in the LHS. Don't know how much power this little bugger puts put though.

That engine is about a .40 size with electronic ignition and puts out about 1.35hp. Saw one in a LHS about two years ago.

More info at:
http://www.aerohobbies.com/Cars/Compagnucci.htm
http://www.mecoa.com/compagnucci/index2.htm#gasoline

Thats 1.35 hp at 17,500 RPM!

They also make engines for model Aircraft!!!

http://www.compagnucci.it/uk/frame_uk.htm

I wonder how much $$, I can't find it on the web-site. Maybe Mecoa can import one... if the price isn't to high.

From what I could tell, it doesn't use needle bearings in the con rod. So it requires quite a bit of oil when running glow fuel and a good dose of oil with gasoline too.

Diablo - I haven't torn apart dozens of engines (only 5 or 6), but I've never seen bearings on the connecting rod. Even if it did have bearings there, shouldn't they be regular bearings or roller bearings? Needle bearings are tapered and seem inappropriate for the con rod. They're more appropriate for the front crankshaft bearing. Is that what you meant? I can't read Italian, but the exploded view of the Campagnucci engine looks like it has dual ball bearings (item #16 & 17).

Needle bearings aren't tapered. Needle bearings are a type of roller bearing where the rollers are very long compared to the diameter of the rollers. Most 2 stroke gasoline engines use needle bearings on both ends of the connecting rod so they don't need a large amount of oil in the fuel to lubricate the bearings. Glow fuel engines use bronze bushings in the connecting rod and require 15-20% oil. Most gas engines can get by with 2-3% oil.

Needle bearings are not tapered. You may be thinking of tapered roller bearings?? Tapered bearings are used on some cars(ect) and have a adjustment. There may be various versions of each. RCIGN can explain it better. Captinjohn

What you describe is what I've always known as roller bearings, and the tapered version of a roller bearing is what I've always known as a needle bearing (each roller is smaller on one end than the other). Sorry if I used the wrong terminology.

Since I've only torn apart glow engines, that explains why I've never seen bearings onthe con rod, just bushings.

They may have bearings on the con rod which doesn't show in the exploded view (the exploded views of glow don't show the bushings either). According to the website the gas ignition version of their engine uses That's a 20:1 mix after break-in. That's a bit higher than the average gas 2-stroke, but the average gas 2-stroke doesn't spin at 17,500 RPM.

needle bearings are in many cases - uncaged and a typical application is in transmissons of cars -surrounding a shaft and inside a multiple gear (cluster)
roller bearings are typically - in a cage of some type .
typically, something holds the rollers apart.
Needle bearings in a retainer are the type of bearings used on model engine con rods .
this is a shell with the ends rolled around the ends of the needles and the exposed bearing surface is the inner portion .
hows that for useless info -

OK - I've acknoledged my error - this isn't my area of expertise, and was using the wrong terminology.

That aside, what makes anyone say there aren't bearings on the con rod? For a con rod this small, they may be permanently integrated into the con rod ends.

If anyone reading this thread can read Italian, perhaps there's more info on the website you can translate for us, or can send an email to the manufacturers.

Has anyone found out the approximate price?

That they would be shown in the exploded view. Here is a shot from an old O&R Compact III showing the rod bearings.



56 & 54 are the bearing groups. If it is any consolation, they are listed as "Roller Bearings" in the parts list

The Dictionary of Automotive Terms and Abbreviations lists Roller Bearings as: A bearing using a series of straight, cupped, or tapered rollers engaging an inner and outer ring or race.

Merriam-Webster Online defines roller bearings as: a bearing in which the journal rotates in peripheral contact with a number of rollers usually contained in a cage.

roller bearing: 1 outer race, 2 cage, 3 roller, 4 inner race

The Dictionary of Automotive Terms and Abbreviations also lists Needle Bearings as: a roller type bearing in which the many rollers have a very narrow diameter in relation to their length. The design makes them particularly useful in situations where there is limited space such as the rod bearings on some pistons. Also called "Quill-type bearing."

Merriam-Webster does not have a listing for needle bearings.

I think tapered roller bearings can be used as a thrust bearing...not positive. I wish more model engines had rod bearings with needle type bearings...allowing less oil needed in fuel. Capt,n

Timken- I recall pionered the tapered roller setups - long ago - they took up both radial and axial loads .
angled rollers are used in many apps - cars etc..

The only time I've ever seen them in use, was on a vertical axis which had to bear weight and still rotate. The front thrust bearing on our engines is a prime candidate for tapered roller bearings.

A standard ball bearing will take about half of its rated load as a thrust bearing..The small amount of thrust our airplane engines make doesn't come anywhere near what the bearings could take..US and Quadra 35 and 41 engines have roller bearings, the thrust is taken up by a bronze thrust washer..Many small glow engines have bronze bushings and work just fine....I think someone at Fox engines once said there was no difference in the performance of the bushing engines, just less weight.....

ball bearing much more simple and cheaper -
model engines - setup correctly - have a teensy bit of play in the bearing setups which allow the front bearing to take the thrust load - the rear bearing takes the radial load - on th chain saw stuff - there is still some slop needed - tho which bearing acually handles the axial load is unknown to me - and frankly
I don't care .

So Rcign, based on your experience with gassers, would you be concerned about running this Compagnucci engine without roller bearings in the connecting rods?

in a normal glow engine the front bearing carries no thrust load unless it's used in a pusher configuration or being slammed on with an electric starter, in normal use the rear bearing carries the thrust load. tapered roller bearings are used in pairs and require a spacer between the inner races, this would make a very expensive engine. standard ball bearings carry this small thrust load just fine.
the needle bearings on gas engine con-rods are the simple uncaged type that serve well at low engine speeds, for high speed glow engines a caged needle bearing would be needed but the main problem is finding room in anything smaller than a .90 .

dave

Strato...Super Tigres have a bronze big end bearing, run well on gas with enough oil.....

I've email Compagnucci in Italy for prices (aero version: CXR0036) but have no reply!

Try MECOA for prices....also. You may want to ask what is the best oil and ratio to fuel for these engines. I got a price on them by emailing, but do not want to give that data out. The company will ...and should quote prices. Capt,n