Well guys lets hear what you think is the strongest 50cc engine out there!

BME 58

Ditto

that would be a strong 60, enter the 58 prosport LC by mvvs.

you forgot DLE55

Sorry, but the BME hammers on the DLE. Good engine with the DLE but is not in the top two on stock (factory) exhaust.

For those that want to list engines using a tuned exhaust system to obtain the power output, fairness cannot be used for comparatoive purposes unless the tuned exhaust system is included in the new and basic selling price of an engine.

Hands down and without question, BME 58

I would have to go with the Evolution 58

Can't see the value of rating a 58 in a 50 poll. Am I missing something here? If this were a 60 poll, I could see including it.

My Taurus 52 is stronger than my DA-50 or 3mm 53.

Neither can I [:@]
It also seems that the poll represents mor of the question :"which engine do you use?" than results from fair comparison.

Well.. It serves to pass time.

In which case the Taurus 52 is at the top of the choice list. Aren't very many straight 50cc engines out there. A few listed as such really aren't actually 50cc's. So I guess we have a 50cc class or only a couple of engines to choose from.

Of the 50 class engines I own, all run well but are quite different from each other. I wouldn't exchange them between the airplanes they are currently in. I've preached a long time the importance of matching an engine to its application rather than just picking an engine because its the best performer in its class or because its carb is mounted where some people think it shouldn't be. Some people think a piston port, side carb induction engine can't perform up there with a rear intake engine .... they are missing the enjoyment many engines could offer them. This is probably going where it shouldn't so I'll quit now.

That is a non-argument, and you know it.
My 50cc MX engine that produced about 12hp on a close ratio geared tuned pipe, and 9.5 hp on a wide band tuned pipe would only produce about 4.5 horses on a short stack, and would be well served with 3.5 horses on a restricting side dump muffler. A powerfull engine? You bet! But it would loose to your definition. We are talking power here, not means to bias the views.

I agree. The problem, if there is one, is there are so few true 50's. The BME 50 was left out of the bunch. The OP built the poll around 50cc engines so the inclusion of any engine exceeding that displacement is probably out of line. However, there are engines with more displacement that weigh less than any of the 50's noted, and there are engines of slightly larger displacement that weigh considerably more than any of those listed. 3w 55 is a perfect example.

Any of the engines listed could have it's base max output altered with a correctly matched and tuned exhaust system. That seriously skews the price and output. So where is the line drawn for a true comparison? No exhaust? In many cases is would be less noisy in a dyno test than with the stock mufflers. A DA on stock muffs drives me out of the shop when it's running on the dyno.

LanceLKs i feel ya

A tuned pipe is part of any decent 50 ccsetup
If you have aweed eater -doing duty as a weed eater -I can see using a compact muffler -other than that
No thanks
No tuned pipe only provides mediocre performance It is simple physics - a tuned system-even a mild tuning setup, is basic to any decent two cycle performance package

But NO engine is sold packaged with a tuned exhaust. All are sold with a cheap exhaust diverter or nothing for the exhaust at all. So which tuned system does one rate an engine with? As you noted, a decent exhaust system is a power multiplier, so those willing to spend many, many hundreds of dollars (likely more than the engine cost) could easily stack the power deck by finding and experimenting with the exhaust.

So what exhaust should be used for an accurate power comparison? Logically it would be none for a baseline comparison. Those wanting the most power are dependant on those that have already spent the time and money or need to be willing to toss the dice with their own time and money. Realistically they will need to buy a few different engines and do a lot of exhaust work to find "the one".

A Zenoah G-62 !!

Thats why the BME 58 is the hands down winner. More or equal power than a 50cc engine on a pipe with the benefits of a super lightweight set up. Yet put a pipe on the BME and it weighs the same as others with stock exhaust and now the power can really be noticed. Each way the BME wins.
You can't say the BME 58 doesn't belong in the 50cc class since it is designed to be for planes in that class.
If you want to exclude the BME 58 then change the poll to read.... Whats the best of the over weight under powered 50cc class engines.

It's how you look at it
Iwould not consider a noisy setup
and making quiet power requires expansion
so grab a pipe
as for open port comparisons Not really very good as some open port setups spill the mix badly and others do not. ANY of em run better with a pipe or some type expansion setup
the rub is that setting up a decent exhaust system is apparanly a daunting task for some . So the hunt goes on for a setup which is the best with no good system - when the results can never be the best . a conundrum

Dick, you make my head hurt in a good sort of way ... make me think a bit which is painful some days!

In my 40 years plus flying our toys, I bet for every tuned system that I have seen that worked well or worked at all, I have seen dozens that were just expensive, worthless exhaust pipes. For the most part, people just plain don't understand tuned exhausts and choose not to learn about them. Some people such as the pattern and FAI pylon crowd are forced into understanding them ... most of us are simply ignorant and choose to stay that way. Yes, I would put myself in that catagory too. Simple exhaust systems work for most of us unless forced to use something otherwise.

Dick, you are a critic of people such as myself that continue to use simple exhaust systems but you do little to educate us away from our simple ways. I for one would be willing to learn more if directed in that direction. Maybe you could start a thread about tuned exhaust systems. Basic theory, etc. along with examples of products that we could use. Just a suggestion.

As for this thread, the original poster should have stated something about the exhaust system that would be used. When I read something like this thread, I assume simple, conventional mufflers / exhaust diverters will be used on the comparison engines.

I have a K&S 1060 tuned pipe for a 50 to 60 cc engine up for grabs!
60 bucks + shipping

For practical purpose, and I think in the spirit of this discussion, is how fast a 50cc engine will spin a typical prop for the class.
I have quite a lot of engines in my database. 50cc +- 10% yields 21 engines.
A typical prop would be 22x8, so I queried for those data and sorted rpm descending.
50cc class, +- 10%
motorfabrikant motortype capacity rpm prop
MVVS 50 50 7650 22x8mej
DL DL50 50 7530 22x8 mej
DL DL50 50 7500 22x8 men
DL DL50 50 7350 22x8 xoar
DA 50-da 50 7200 22x8
GR-pro 45 45 7100 3W 22x8
Brison 52cc 3.2 52 7100 22x8
GR-pro 45 45 6900 3W 22x8
DL DL50 50 6800 22x8 JXF
GR-pro 45 45 6800 3W 22x8
DL DL50 50 6700 22x8 MSC
brilelli 46GT 46 6500 22x8 Xoar
CRRC Pro GF45i 45 6050 22x8 NX
CRRC Pro GF45i 45 5880 22x8 NX

Sorry about leaving out the BME 50