Difference in .049 and .051?

Ah, thank you both!!

Well, to go into a little more detail:  The initial engine classes for internal combustion engines back in the free flight days were classes A-D.  Class A was anything under 0.1525 cubic inch, Class B 0.1526-0.300 cu/in, Class C 0.301-0.650 cu/in, and Class D was anything over 0.651 cu/in.  Later, when tiny engines became popular for free flight, the 1/2A class was created as being anything between 0.0 and 0.5 cu/in.  

The popular .049 fit into the 1/2A class.  But, Cox figured that if they produced a .051 engine in the same case as a .049, Free flight competitors could build one plane and compete in the 1/2A class, then quickly swap the .049 for a .051 on the plane between heats and use the same plane to compete in Class A.  I don't know if other manufacturers did this also, the Cox .051 is the only .051 that I'm personally aware of.  I know other manufacturers created .065 and .07 engines, but I don't know if they used the same mounting holes.  I'm pretty sure the Anderson Spitfire .049 and .065 used the same mounting pattern.

The Amateur Historian Mark

The Holland Hornet came in .049 and .051 . as did the Atwoods .

Mike1484

The 'twinning'concept was quite widespread-and certainly not confined to the 1/2A class-with a bit of digging you can find examples of .19/21 .19/.201 for some well known brands, plus .29/.31 and .29/.33 plus .49/.51 sizes-all essentially the same engine but either bored or stroked...and from the late 50s thru the late 60s it was just about de rigeur for manufacturers to use a common case for their .29/.35 offerings...and as many other common parts as they could reasonably get away with...

In more recent times a few manufacturers have produced variants of the same design in marginally different capacities to meet US class rules as distinct from the wider world market-two examples would be the CS replica of the ED Hunter 3.46 (.21) produced in a .19 size for the US vintage classes, and the VA Elfin 0.36cc reduced to .020 again to meet US class limits...

ChrisM
'ffkiwi'

ffkiwi wrote:The 'twinning'concept was quite widespread-and certainly not confined to the 1/2A class-with a bit of digging you can find examples of .19/21 .19/.201 for some well known brands, plus .29/.31 and .29/.33 plus .49/.51 sizes-all essentially the same engine but either bored or stroked...and from the late 50s thru the late 60s it was just about de rigeur for manufacturers to use a common case for their .29/.35 offerings...and as many other common parts as they could reasonably get away with...

In more recent times a few manufacturers have produced variants of the same design in marginally different capacities to meet US class rules as distinct from the wider world market-two examples would be the CS replica of the ED Hunter 3.46 (.21) produced in a .19 size for the US vintage classes, and the VA Elfin 0.36cc reduced to .020 again to meet US class limits...

ChrisM
'ffkiwi'

Yes,
I have a couple of Enya .19X and .21X engines that Enya did back in the day to fit that class.
Enya had an .049 / .06 / .08 and .10 that had the same crank case size but larger sleeves/pistons.
Though those engines were more for the home market, some did make its way here. I have a couple.
I do not have a Enya .10 in my collection (yet?)

The Enya .08 with high compression head


The Enya .06 diesel


The Enya .049 on the test stand -- note head difference on the .08 and .049  --- the .049 has the standard head.

Sosam117....you are lucky to have an 08..they're very thin on the ground outside of Japan...as is the 10....I have a couple of the early 06 glows and late 06 glows=plus an early 049...but none of the diesel variants ...(yet!)...the diesels seem to attract a frenzy of bidding on Ebay when they come up. I AM intrigued by your 'high compression' head...was this a standard item? or an accessory? All my 06s and the 049 have a head like your 049 on the test stand....do the heads all have the same threaded OD or are the 049.06 and 08 different diameters?

I might go chasing Ken Enya about any spare parts availability...

ChrisM
'ffkiwi'

ffkiwi wrote:Sosam117....you are lucky to have an 08..they're very thin on the ground outside of Japan...as is the 10....I have a couple of the early 06 glows and late 06 glows=plus an early 049...but none of the diesel variants ...(yet!)...the diesels seem to attract a frenzy of bidding on Ebay when they come up.   I AM intrigued by your 'high compression' head...was this a standard item? or an accessory? All my 06s and the 049 have a head like your 049 on the test stand....do the heads all have the same threaded OD or are the 049.06 and 08 different diameters?

I might go chasing Ken Enya about any spare parts availability...

ChrisM
'ffkiwi'

ffkiwi,
The standard head and the "high compression" head are similar to the Cox glow heads.
The high compression head has less of a dome shape inside. Where as the std head has more volume.
That is why the std head is taller than the high comp. head.
The standard heads were normally the original heads shipped out. You had to special order the 'high compression' head.
The 'high compression' heads were only for the 06 / 08 and 10 and not for the 049.
The head diameters are slightly different.

shtterman sells the cylinder heads:
https://www.ebay.com/itm/ENYA-080-10-060-049-CYLINDER-HEAD-NIP-CHOICE/223467215993?hash=item3407af1c79:g:gp0AAMXQkTZQ3w9V

I had to get a replacement head for the 08 a couple of months ago because someone overtightened the glow plug and stripped out the threads. There is no brass insert (like Enya has on their other engines) and the aluminum gets stripped easily.

So,  Ken Enya told me, the only replacements he had were the 'high compression'.
Well I needed a new head, so I said o.k.

As for my collection of small Enya 049 /06 /08 and 10.
I have 2 - Enya glow 049 with reed induction, 1 - glow 049-TV
2 - vintage (1960) glow 06-TV ( purchased during Vietnam war)
1 - glow 06 reed induction
4 - glow 06-TV and 3 - diesel 06-TV
1 - glow 08 and 1 - glow .10

I got one Enya .06 diesel  and the Enya .08 engine this year from a friend Australia.
He lives in Macgregor, Australian Capital Territory.
Had to get a new crankcase because he removed the lower mounting lug?
The two diesels I got were from Carlson Engine Imports. I would have purchased more diesel Enyas from him but Altech ( the US distributor) didn't want him to sell any Enyas. Though Altech was not importing Enya diesels. Carlson tried to strike a deal with them, that he would only sell the Enya diesels and he had customers that only wanted diesel engines. Altech didn't want any competition and told him no and "if" he sold any Enyas they would take him to court!

Few years later Altech folded and no US distributor for Enya engines.

So, with the help of the internet (around 2005) I purchased 3 - Enya 15 diesels engines from Modelflight in Australia.
I purchased other Enya engines from Modelflight (two - glow 06 engines - had "instock") because that was the only place I found on the internet. (at that time)
Then, I found a hobby shop in Singapore (on the net). I was able to purchase the Enya 10 and the two Enya 06 glow engines.
The one glow 049-TV (slightly used but was in-the-box with muffler, two wrenches, and spare glow plug) I purchased from a friend in England ($125.00 USD) last year.

I'm trying to get more of the 08 and 10 (maybe a few more 049).

My Enya 06 diesel on the test stand ( it uses the glow 049 throttle valve carb.)


Bottom mounting lug removed by my friend in Australia


New crank case from Ken Enya


My Enya 06 glow engine on my special made mount (notice the down thrust in the mount)
14cc hand made tank. Engine runs for aprox. 16 minutes at around 4300rpm (about 1/3 throttle - open as see in the photo)
Fuel: 0% nitro / 22% caster oil / 5% white gas (Coleman lantern fuel) 73% alcohol
muffler not installed at this time.

Impressive-you must have one of the best small Enya collections outside of mainland Japan!  I will certainly follow up with Shtterman on the heads-I emailed Ken Enya about a year or so ago regarding spare parts for the 049/06/08/10 engine but received zero response..which I thought was a bit poor, since I know he does speak english.  I would particularly like to get my hands on the red anodised pressed alloy mounts, as only one of my reed valve ones has the mount. As all my small Enyas have the 'std' heads, obtaining the high compression one will allow a bit of bench testing to see what can be gained....and that info might also be applicable to the Fuji 049 and 061...though my 061 is the blind cylinder model....whereas the Fuji 049 model I have has what looks to be a very near identical screw on head to the Enya...

 ChrisM
 'ffkiwi'

PS Did you deal with Ken Enya directly for replacement parts, or did you source the parts via Bobby bBrooks aka 'shtterman'?

ffkiwi wrote:Impressive-you must have one of the best small Enya collections outside of mainland Japan!  I will certainly follow up with Shtterman on the heads-I emailed Ken Enya about a year or so ago regarding spare parts for the 049/06/08/10 engine but received zero response..which I thought was a bit poor, since I know he does speak english.  I would particularly like to get my hands on the red anodised pressed alloy mounts, as only one of my reed valve ones has the mount. As all my small Enyas have the 'std' heads, obtaining the high compression one will allow a bit of bench testing to see what can be gained....and that info might also be applicable to the Fuji 049 and 061...though my 061 is the blind cylinder model....whereas the Fuji 049 model I have has what looks to be a very near identical screw on head to the Enya...

 ChrisM
 'ffkiwi'

PS Did you deal with Ken Enya directly for replacement parts, or did you source the parts via Bobby bBrooks aka 'shtterman'?

I dealt with Ken Enya directly. I had the part numbers and made up a list for him like below
---AND---
In the subject line I put in bold print  *** ATTENTION --- NEW ORDER ***

QTY x description (part number)
1 x crank case (09303)
1 x front housing gasket (09316)
8 x back plate gasket (06212)
8 x carburetor gasket (06214)
8 x gasket for cylinder (06213)

I'm fortunate enough that some of my Enya 049/06/08 engines have a illustration sheet with part numbers.
I know of that red anodized mount that you are taking about. I only have one of those as well.
My slightly used Enya 06 reed engine (with case - not a box) has one in it.
I don't have any for my 06 reed engines. Maybe I should see "if" Ken has any "on-hand"?

As for my Enya collection, there is another guy that has a good collection of these engine as well.
Check out this thread for other small Enya collectors.
https://www.coxengineforum.com/t11528-enya-049-06-engine?highlight=Enya++06

Last thing.
I purchased from Ken Enya today the last of the Ultra 11CXD-TN that he had on his website. Two of them.
No more Ultra 11CXD-TN engines.
Ken told me what engines are available is he end of any more built engines.
So it looks like the only engines left are the glow engines ( the .15CX-TN and the Ultra11CX-TN

Indeed...worth touching base with him on the subject. I imagine there are two different mounts-one with a two screw mounting for the 06-I and 06D-1 backplate and one for the 049-1 reed backplate with a 4-screw mounting. I need two of the 2-screw plus one for the 049-I. Any chance you could scan and email me the 049/06/08 parts sheet-or the whole instruction leaflet? or post it here?

ChrisM
'ffkiwi'

ffkiwi wrote:Indeed...worth touching base with him on the subject. I imagine there are two different mounts-one with a two screw mounting for the 06-I and 06D-1 backplate and one for the 049-1 reed backplate with a 4-screw mounting.  I need two of the 2-screw plus one for the 049-I. Any chance you could scan and email me the 049/06/08 parts sheet-or the whole instruction leaflet?  or post it here?

ChrisM
'ffkiwi'

We should move this to a new thread?

I don't have a scanner/printer.
I usually go up to my library and do that, but with the covid-19 the library has been off limits.
The back plate gasket and carburetor gaskets are all the same for 049-II TV/06-II TV/08-II TV and 10-II TV
They also work for the reed engines as well.
See the stock numbers above.
Head gaskets are a different part number and are made of aluminum. See the attached photo of the head gasket.
Though, I have not seen brand new Enya 049/06/08/or 10 have these head gaskets installed?

shtterman might have the same illustration for the part numbers?
See if Bob Brooks can do it?

06-II head gasket -- .030" thick


06-II head gasket


06-II head gasket stock number

Agreed-we should be in the non Cox engines section....

CJM