piston/sleve identity
 

Someone somewhere was looking to identify a piston and sleeve set.

The piston is not 2 piece, that is a machined relief to prevent piston crown from scoring sleeve at temp.

These are for 70s vintage O.S. Max R/C and or stunt.
They interchange between cases, the .30 will fit .35 and the opposite is true.(sleeve od is same)
Crank rod pin all interchange.
Heads do not, the head and Sleeve have to be the same.

Part numbers are 30R/C code 22203002 and 35. 23003002.

Bore on the .30 is .734 approx
bore on .35 is.805 approx
This in inches not the foreign stuff.

RE: piston/sleve identity
 

You know that some Classic Stunt guy is looking for that 35 Max S piston and sleeve!
Chris...

RE: piston/sleve identity
 

Hi, I think that the query you refer to on whether the piston was a one or two piece unit was one I posted elsewhere. I think you hit the nail on the head on both counts, at least as far as I'm concerned you have. The .30 Max set also appears identical with the one that I have. Thanks for clearing this up.

RE: piston/sleve identity
 

Chris
Do you need one?

flyingtigre
Check the bore size.
I posted the rough measure above.

I have not checked the timing on the 2 different sleeves but would be they are the same.

The .30 should still make more power than a Fox.35 stunt.


David

RE: piston/sleve identity
 

OK, pulled out ye olde calipers and here's what I got. Piston as measured about 1/16th inch below top = .738; port in = .396 to bottom of cylinder, .827 to top of cylinder; port out = .5 to bottom of cylinder, .787 to top of cylinder. Don't know if those last few measurements are of any interest or value.

RE: piston/sleve identity
 

Knowing I did just a quick measure with old calipers I would say you have a .30

RE: piston/sleve identity
 

No David.
The one I have is a hybrid with a cylinder, liner, piston and head from a Super Tigre 46. It's a T&L 40 from Tom Lay in SoCal. Runs great, very light.
Thanks though,
Chris...

RE: piston/sleve identity
 

flyingtigre

Well it seems I can not find the stuff I remember but instead find stuff forgotten.

Just ran across a piston/sleeve for an Enya .35 that also looks like the ones posted.
The bore is approx .801.
The pic is of the .35 an project I dug out to finish. Stroking it with a .45 6001 crank.:D

I do not have a .29 dissembled to check but it is a possible your sleeve is for an Enya .29.

Ah! just dug this out, a NIB Enya .29-IIIB Super Typhoon model# 5103 with specs sheet.
Bore .735( you measured your piston at .738)
stroke .704

So far no dead on match.

The closest measure between indicates the .30 OS but if memory serves right ENYA had several bore/stroke engines in various sizes.

There are no by pass holes in piston or sleeve on these 29s and 35s.
I think the OS .25 did have holes.will be awhile before I get around to restoration of this size engines.

Brian Hampton from Adelaide(downunder) has good knowledge of the Enya.
Tell him I sent you!


David

RE: piston/sleve identity
 

Wrong thread
Whoops!

RE: piston/sleve identity
 

I'll help if I can but I'm not sure what the question is :D.
You mentioned a 29-IIIB Super Typhoon though which has me wondering. The Typhoon name was only applicable to the very first sand cast Enyas with a red cylinder head from the early 50's but there was an Enya 29-IIIB Special called the Speedy in the USA which had a bathtub shaped intake and a single rear ballrace amongst other differences.

RE: piston/sleve identity
 

Brian
3rd post this thread should work on clearing up what the question was/is.
How are the children in Jim's playpen doing? Hope they are getting along.

This winter may have time to do some good measuring of pistons and sleeves to help for sure Id what Flyingtigre has.
Current work on trimming out Stunt planes and retraining pilot leaves not a whole lot of time for engine work.

Mysteries, I like good engine mysteries!;)

Here is the payper work, box and engine, Super Typhoon.
4 of these were brought back from Japan, although 3 have been traded of over the years.

Camera is lousy at close in photos.
Pictures do seem to clear if zoomed all the way(2X click)

RE: piston/sleve identity
 

I comparing the 5103 to a 5224 with out disassembling:
The 51 is smaller than 52
The 51 appears to be bushing crank.
The 52 appears to be twin ball bearings.
The finish on both engines is similar with the in box 51 being slightly Grayer.

Also for finish comparison is pic of sand cast Fox 1949 ECJ 6 .35 stunt with a Forster .29 that just guessing would think it is sand cast.

For same is pic of of what we on the Topside or North end of the ball call a Bath Tub intake.
Sand cast Fox .29R " The Worlds Most Advanced Racing Motor" Duke was funny that way!

I remember breaking in ENYA lapped engines, Very painful for the fingers. Hooking them to a quart can and just let them run.
Last forever once broke in.

RE: piston/sleve identity
 

The 5224 on the left is the 29-IV Special with twin ball races and a different crankshaft using a 1/4 x 28 prop thread instead of the usual 7 x1mm. The 5103 is a 29-IIIB and yes, a bushed crankshaft.

That's interesting about the Super Typhoon in those instruction sheets because I've never heard or seen that reference before.

Seems like I might have to strip a couple of engines too and do some measuring of the ports like flyingtigre did.

RE: piston/sleve identity
 

Brian
Found this.
One on left has what I have come to recognize as sand cast finish

RE: piston/sleve identity
 

Many thanks to everyone for their assistance in determining the construction of the piston and the engine to which it belongs. I've concluded that the piston is truly of one-piece construction and probably belongs to an OS engine. Only a manufacturing process step made it appear otherwise.

RE: piston/sleve identity
 

Nice find Dave. The one on the left is the second version (of three) of the original sand cast 19's dating from February 1950. The head and prop driver were originally anodised red and there's a trace of the anodising left in the knurling of the prop driver. The main identifying feature for the second version is the straight sided head fins. Very little is known about these early sand cast .19's so it's a bit of a rarity.

The one on the right is the first die cast 29 made after the original sand cast Typhoon and dates from early '54 and there were two variations but I can't pick which one yours is from the photo. It's not known for a certainty which came first but there's a difference in length between the exhaust ports, one has a port that's 36mm long and the other is 38.5mm long. It's been decided (because Enya themselves aren't certain :)) that the longer exhaust is the later version for various reasons.

RE: piston/sleve identity
 

Brian
Stumbled across the image on a Google image search will doing some Fox research.

I wish those 2 were in my collection but not!
Do have a twin exhaust O.S. though.

flyingtigre
I think you have O.S. P/S also.
Will not be 100% certain until I have time to do more measurements.