440 cuyuna

[fordmtrsp]

Is there any difference between the 440 cuyuna and the jlo,rockwell. Will they bolt right up to where a g50b was or is there modifications that have to be done?

[Don]

Scorpion bought the JLO/Rockwell rights and moved the company to Minnesota back in the late 70s or early 80s. They called the engine Cuyuna after the local mountain range. They made some changes, but it was still more-or-less a JLO. Anything twin with a six-bolt head is a five port engine and will give better performance. They won't bolt up to the Xenoah/Chaparral mount without changing the mounting holes.

Don

[fordmtrsp]

would you prefer the 440 cuyuna over the 484? Also would you prefer a jlo model over the rockwell?

[fordmtrsp]

Im sorry I meant prefer the jlo over the cuyuna?

[Don]

I like them all, and they're all good powerplants for those that want a 2-stroke. The Chaparral is a little hotter engine (just my opinion- I don't want to start an arguement with the German engine boys) but tends to be a little higher maintenance and more finicky about weather, altitude, etc. JLO and Cuyuna are the same basic engine and the parts interchange for the most part. I don't think there's any real difference in say, the 5 port JLO 440 and the 5 port Cuyuna 440.

Don

[hydromike]

Oooo, he got me by 20 min. I know you're asking Don, but I'm going to throw in my 2-cents. The Cuyuna 440 and a Rockwell JLO 440 that has a "dash 8" (-8) or a -9 at the end of the model number are really quite similar engines. I have a Rockwell JLO 2F440-9 that, aside from the sticker on the fan shroud (and angled spark plugs, vs. vertical spark plugs) is the same 'dern motor as the early Cuyuna 440s. I cant' tell the difference, and the power is pretty spot-on between the two.

If you're shopping around for a 440 Rockwell, look at the serial plate on intake side (I think?) of the crank case. Anything around -8 or -9 is going to be right on par with the "Cuyunas". I don't think Cuyuna made an effort to distinguish their 440s from one to the other once they took over production. At least I haven't seen numbers to suggest it. A 484 Chaparral is going to make more power than the Cuyuna/JLO. It seems that the 440s are all over the place, and are pretty easy to come by. A Chap might be a bit more of a hunt, but they're a great engine if you can get one. I run at least one of each of these, and they're very solid, reliable engines. I have the Chap in my RIM, and it moves that 3-ton pig along quite nicely. It sure would love to have a home in something about 400 pounds lighter, though...

~m

[geno]

JLO

CUYUNA MOVED OUT OF MINN. AND CHANGED THE NAME TO 2si located in nc. I HAVE GOTIN PARTS FROM THEM IN THE PAST.