Does anyone have a good link to a crankshaft thread size chart for glow engines?
I've been searching for an hour and can't really come up with a good comprehensive chart anywhere.

Tower used to have one in their catalog, but that's gone too.

Thanks_bob

http://www.tru-turn.com/af.htm

Thanks for the link and I was there also.

Trouble is, I'm trying to sort out a bunch of spinner nuts and adapter nuts.
Once I get the sizes, I'd like a chart that goes the other way where you can look at the size and see what it fits
rahter than looking at the engine and getting the True Turn adapter number.

Take care_bob

Go to http://dubro.com/DUBRO2005CATALOG/index.htm and see p.53 of the catalog.

Amazing...I was doing a google about an Enya a few hours ago and stumbled across this.
http://www.greathobbies.com/technica...crankchart.php

Off topic, but after I looked at the Du-Bro chart, I went to the Great Planes chart to confirm that O.S. engines used 1/4"-28 threads or 5/16"-24 threads. Since I haven't had to replace one, I had no idea that they weren't metric. Anyone know why not? Dzl

Thanks for the help guys.

None of the charts list the Moki 1.35 and up.

Does anyone know that one?

Because we'uns don't like no metric stuff. We tolerate it but if'n you want'un to sell it to us'ins you need to take care of us'ins. Seriously, it is what the market demands. Since the US of A is big market, they tend to satisfy us. Recently, I acquired a Checz engine and had to buy a metric reamer for almost $20. All other engines seem to be old English (which I like and what I grew up with).

So personaly I think all the shafts should be in inches not millimeters.

Cheers,

Chip

If you look closely at the Tru Turn chart, they have the shaft and thread sizes there also.

If you've got one of the old English Merco 29 or 35's then don't ever lose the prop nut. It's a 1/4x26 which is a Whitworth Fine series.

Still, one day America will catch up with the rest of the world and go metric .

Downunder, is Australia all metric? Interesting, if it is, since the fractional idiocy originated in England.

Don't have blind faith in what you read in any of these sites, in regards to MVVS engines.

These engines have lately (three years ago) had their thread sizes changed.

The .40-.49 engine now have a 7 x 1.0 mm thread.
The .61-.91 engine now have an 8 x 1.25 mm thread.

If you get an older MVVS of these sizes, it may still have the older 6 x 1.0 mm thread.


So before believing and taking things for granted, take your vernier calipers and measure it yourself.

We've been 100% metric for about 20 years now. America and 2 third world countries are the only ones still not metric, although in America's defence you're looking at the way Australia did the changeover because ours appears to have been the easiest.

Dar, I noticed those MVVS sizes and couldn't believe they're the same as my old OS Max-III .15's.

Brian,


For a certain time, MVVS had removable studs in these engines, that had to bolt into the 7 and 8 mm front journal...
So the 6 mm thread was about the largest they could use.

It was well made and very hard. It held up pretty well.

Then there was, on the .40-.49, a one-piece crankshaft, with the same 6 mm thread... It occasionally broke while tightening the prop-nut...
So they went to 7 mm after about a week.

This size is strong on a .40-.53!

Nothing to comment about the 8 mm thread size.

I have an older MVVS .40 with a 6mm x 1 thread.
It is hard to get a comprehensive list it seems.

So, does anyone know if the Moki 1.35 is really 8mm?

Happy Holidays_bob

Manufacturers in the States are still supporting legacy products dimensioned in inches, but if you look at the prints you'll find metric dimension. A 3/8" shaft or bolt shank might be dimensioned
ΓΈ 9.525, and the threads will be listed as 3/8-16 (for example). I've seen old prints redrawn to have metric dimension specs, but the product didn't change.

New designs are commonly all metric, but since fasteners dimensioned in inch are still available, they might be specified on a new print. All-New designs are commonly (all right, not exclusively) dimensioned and specified using Metric.

When demand for the legacy products goes away, the new ones will all be dimensioned in Metric. I don't see that demand disappearing, or even fading, for years.

In a niche market like the RC engine market, I could see the switch to metric taking place more quickly. Me, I just don't care, a dimension is a dimension, and a trip to the hobby shop (or hardware store, or lumberyard) is still just a trip.

Good luck,
Dave Olson

30 years ago I thought the change to metric was eminent. That within a couple years we would be all metric. At the time USA cars were Usually metric on the engine and inch on the body. About major factor that's changed in the last 30 years is that the cars are mostly metric now. That is because the cars have become more worldly.

I guess Chinese and 3rd World imports to this country have increased and they are metric? They are mostly "throw away" items and are not field repairable. So you7 do not notice the metric factor with them.