More ST G21 .35 Questions

Have two more questions for you knowledgeable folks.

1)Anyone know the Boca part number for the front bearing on a G21 .35? Or at least the dimensions. I get very close to .250 ID by .750 OD but not exactly. Measuring with calipers so they may be off a tad.

2)I have a replacement crank that has a full circle at the back end as opposed to the cut out one that was in there. Is it better? Also the full circle one has an aluminum spacer on the front that goes up by the front bearing. Which way does the spacer go on the crank?

spacer goes with the "cupped" side toward the rear of the engine. I belive the complete round cranks are the standard rpm, with the cut-out versions being for racing. I have two new in pack ones here, and one says RACING with the cut-out type, with the other with just a part reference only. I got some cranks from Italy last year for the .65 RISE models, and the same RACING application was on the package.

EL7Z is (or was) the FAG/Norma-Hoffman part number.

Great - now I can call Boca. And thanks for the info on the spacer and the cranks.

Cary,

The full-wheel cranks are nice, as when the outer band of aluminum comes slinging off it makes a very thorough mess of most all the spinning parts, doesn't do any of the non-rotating stuff any good either.

Then you can get back to using an engine which is superior to the kitty and for which you can still get parts.

Have fun...

LAST EDITED ON Feb-28-04 AT 11:01 PM (CDT)
 
Hmmmmm - Dan, Thanks for the advice. I have a very strange fondness for the ST series. No know reason and the MD is not suggesting serious help. Have several newer power plants (inlcuding a Nelson or two) that are much better than than the ST. I am subject to random drug tests at work so I guess I'll have to just suffer. I have not fallen to the Pond Scum moters yet but who knows.

LAST EDITED ON Feb-29-04 AT 07:11 AM (CDT)
 
Funny, I haven't had a problem finding parts for mine and they run just fine. This is all a hobby anyway and just for fun so who in the world gives a hoot what is superior to what?
You're trying to split hairs with a flint ax Dan.

Jake

The full-circle crankshafts were made later than the others. I don't think the full-circle shaft was as good as the previous version. Supertigre kept "improving" the G.21 .35 until is was pretty useless. As Dan suggested, the aluminum bands would come off. People cut them off so they wouldn't disintegrate while the engine was running.

Yes, the chamfered side of the washer goes toward the rear. It allows the shaft to have a bigger radius where it changes diameter than it could if it had to match the smaller chamfer of the bearing. We used to call that washer the "forget-me-not", because we frequently forgot it during assembly. The first time a prop was tightened, the bearings would bind and remind you that you forgot the forget-me-not.

Funny, I haven't had a problem finding parts for mine and they run just fine. This is all a hobby anyway and just for fun so who in the world gives a hoot what is superior to what?
You're trying to split hairs with a flint ax Dan.
Jake

Jake,

Just so I don't have to participate in any future questioning of you, the result being your hasty exit from this forum, screaming like a little girl, my post was in jest. As in there actually is nothing nice about having aluminum band come loose from the crank. And as it can be assumed there has been at least limited progress in Combat engines since the days of G-21 35s, that too was a joke.

For your further edification, at one time a new Combat 36 was being imported to the U.S. I didn't have one, but Mr. Rush did and filled me on the results of his testing: "Well, there's good news and bad news. The bad news is they are slow. The good news is they blow up."

This is humor in my crowd. Please make a note.

Excuse me a second Dan, where did you distill all this from?
Who in the world would use one of these in a Combat match today unless it were some type of nostalgia/and or speed limit event and you just wanted to use this particular motor?
I was referring to using it as a Sport engine only- they do indeed run and drive there.
I don't run screaming from anywhere- my mobility is a little too impared and so are my vocal cords.

Jake

LAST EDITED ON Mar-03-04 AT 06:14 PM (CDT)
 
Just remove the band and you will live a happy life. Use a 11/4 and run it fast and it will be a good sport motor and last forever.Years ago I ran one in a Nobler and it worked great, Even won a few contests with it in Dunedin Fl in 1973.Wow 30 years ago.