THE NEW MT 57CC ENGINE

[rcign]

Not yet, there's a package at the Post Office, just can't get it until Monday......

[rcign]

No problem, Larry, those plugs fit almost every engine.....Put 'em on your website, people are always needing spares....Every Zenoah 38,45,62, and 80-----ALL Quadra engines....ALL Sachs cylinders...All Brillelli engines, unless he changed...ALL chainsaw conversions....And more

[jrjohn]

	Quote: Originally Posted by rcign
	Not yet, there's a package at the Post Office, just can't get it until Monday......

Sound like a night operation to me, there is no reason why you can't pick that thing up around 1:00AM if you have any decent buddies to help you.

[Al Lewis]

	Quote:
	Crosshatch marks are necessary in a chrome or Nikasil bore 2 stroke...WRONG.... The crosshatch marks are below the smooth surface of the bore...Crosshatch marks above the smooth surface would wear the rings out VERY quickly.....

Amen to that brother. Rings wouldn't stand a chance against Nikasil with cross hatching. BTW Ralph, I may have found a substitute for chrome that's better then chrome and a lot harder wearing. Cheaper then Nikasil though.

[Tired Old Man]

Ralph,

I read one of the posts farther back from someone that is thinking "no more Brillelli" about 6 bolt hubs on 50cc engines. Seems he believes that a single bolt hub let's the prop slip

My personal experiences are that anyone that has more than an 8 year old girls strength can tighten a single bolt hub well enough that the prop or backplate remains secure. 6 bolt hubs on small engines are little more than "bling" to me and originally only a marketing ploy.

What's your opinion? As if I didn't already know....

[jrjohn]

	Quote: Originally Posted by Pat Roy
	Ralph, I read one of the posts farther back from someone that is thinking "no more Brillelli" about 6 bolt hubs on 50cc engines. Seems he believes that a single bolt hub let's the prop slip My personal experiences are that anyone that has more than an 8 year old girls strength can tighten a single bolt hub well enough that the prop or backplate remains secure. 6 bolt hubs on small engines are little more than "bling" to me and originally only a marketing ploy. What's your opinion? As if I didn't already know....

Pat, I always felt the ideal setup was having a choice of single nut, 3, or 6 bolt hub. The MT-57 gives you 3 choices. It probably cost a little more to give this type of setup, but in my opinion it's worth the extra money.

[jrjohn]

Pat, here is what you wrote on another thread earlier today about the single bolt hub. (it's a copy and paste) it seems you were concerned about todays wooden props being compressed and splitting with the single center bolt. I agree with you, my friend with a B 366 had this exact problem among others.

quote
"A single center bolt should be run down pretty tight. Where I work the number is well over 100 inch pounds. I apologize for not being specific. The problem with this is that wood props compress much too much with high center bolt torque loads. The props of today are not nearly as hard a wood as those of 10 or 15 years ago. Back then the wood was typically maple and did not compress much". unquote

[closetguy]

Thanks, Ralph, Johnny on the spot as usual.

[sinergy]

	Quote: Originally Posted by Pat Roy
	Ralph, I read one of the posts farther back from someone that is thinking "no more Brillelli" about 6 bolt hubs on 50cc engines. Seems he believes that a single bolt hub let's the prop slip My personal experiences are that anyone that has more than an 8 year old girls strength can tighten a single bolt hub well enough that the prop or backplate remains secure. 6 bolt hubs on small engines are little more than "bling" to me and originally only a marketing ploy. What's your opinion? As if I didn't already know....

Pat that is a good point... I have never had a single bolt slip a prop.. guess I have more strength than an 8 yr old

As far as the 24" prop needed for an EF Yak that in itself is funny... there is a few hundred out there flying just fine on 22x8s and 23x8s. Keep digging that hole... it's funny to watch.

[Tired Old Man]

I have to admit that a single bolt and the average wood prop don't get along very well anymore. Too bad all the manufacturers now go with soft woods for propellers. The good stuff must cost too much.

If your using a carbon or plastic compound propeller there's no issue with a single bolt hub at all. There's quite a few of them flying for many hours at a time everyday with no slippage, and pre-flights day after day indicate there wasn't any slippage from flight to flight.

Point was, when multi bolt hubs first appeared on 50cc singles there was absolutely no need for them. It was some pretty good marketing strategy to make people believe that what they had was not as good as it should have been, and went on to sell a lot of engines with information based on a lie. Same thing with "auto advance" ignitions over mechanical advance. People are generally kind of dumb and will buy into anything if it's presented nice and slick, even when it's wrong.

If a prop hub was equipped with two anti rotation pins that were long enough to make it about half way through the prop you can still use a single bolt hub on a wood prop made of today's softwoods, using the same torque as you would with a multi bolt. How do I know?? I do this on my own stuff and have a 105cc engine set up this way. The racers flying along at a sedate 220 plus miles an hour with engines over 200cc's are doing the same thing. The process of using anti rotation pins would be less time and work for the manufacturers and make life a lot easier for the users.

jrjohn,

You're the one that doesn't think Brillelli should remain in business becase he uses a single bolt hub? Better have a talk with Echo, Poulan, Toro, Yardman, and just about every other saw and mower engine maker out there. Based upon your position on mulit bolt hubs all of them should be closed up and run out of town.

[jrjohn]

	Quote: Originally Posted by Pat Roy
	I have to admit that a single bolt and the average wood prop don't get along very well anymore. Too bad all the manufacturers now go with soft woods for propellers. The good stuff must cost too much. If your using a carbon or plastic compound propeller there's no issue with a single bolt hub at all. There's quite a few of them flying for many hours at a time everyday with no slippage, and pre-flights day after day indicate there wasn't any slippage from flight to flight. Point was, when multi bolt hubs first appeared on 50cc singles there was absolutely no need for them. It was some pretty good marketing strategy to make people believe that what they had was not as good as it should have been, and went on to sell a lot of engines with information based on a lie. Same thing with "auto advance" ignitions over mechanical advance. People are generally kind of dumb and will buy into anything if it's presented nice and slick, even when it's wrong. If a prop hub was equipped with two anti rotation pins that were long enough to make it about half way through the prop you can still use a single bolt hub on a wood prop made of today's softwoods, using the same torque as you would with a multi bolt. How do I know?? I do this on my own stuff and have a 105cc engine set up this way. The racers flying along at a sedate 220 plus miles an hour with engines over 200cc's are doing the same thing. The process of using anti rotation pins would be less time and work for the manufacturers and make life a lot easier for the users. jrjohn, You're the one that doesn't think Brillelli should remain in business becase he uses a single bolt hub? Better have a talk with Echo, Poulan, Toro, Yardman, and just about every other saw and mower engine maker out there. Based upon your position on mulit bolt hubs all of them should be closed up and run out of town.

Pat, whats your point, I agreed with you about the single bolt hub being a weak link. you seem to be trying to straddle a fence here.

[jrjohn]

Pat, could you please copy and paste my words where I said I didn't think the guy should remain in business. I don't remember saying that.

[RTK]

No reason for a 50cc class engine to have a multi-bolt hub. On my BME 115's I use the center nut and (two) other bolts, that's it. Haven't had a problem with any of them yet.

I really hate tightening and checking all those bolts so they don't shear.
On my 3W's the factory bolts are so soft they bugger up very quickly, one call to Mc Masters Carr and that problem went away.

[sinergy]

	Quote: Originally Posted by jrjohn
	200 bucks cheaper than the Brillelli, and not a chainsaw conversion, 6 bolt prop hub so your prop won't slip. Say goodnite to Brillelli

I think that about covers it

[jrjohn]

	Quote: Originally Posted by sinergy
	I think that about covers it

i could not agree with you more, it doesn't look good for them