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Cox Engine of The Month
my "twin bee"
Page 3 of 4
Page 3 of 4 • 1, 2, 3, 4
Re: my "twin bee"
No, it is the only one whom I built.The fuel is standard with 5% nitromethane, and this engine use a stock "reed".
Now I builds one 4 cylinders boxer of 16 cm3, 2 stroke
Now I builds one 4 cylinders boxer of 16 cm3, 2 stroke
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
Re: my "twin bee"
I am assuming a 4 cyl. will have a proportionately sized "rotary-valve" induction?chris74100 wrote:No, it is the only one whom I built.The fuel is standard with 5% nitromethane, and this engine use a stock "reed".
Now I builds one 4 cylinders boxer of 16 cm3, 2 stroke
Did you increase the fuel/air-flow in the 1st 2 cylinder engine? (asked in my previous post) I am aware of the fuel restrictions/availability in your region... but your Cox engine components were designed to run on fuel with a nitro content of 3-times (minimum) of what your stated test-fuel has.
I would "personally" pay the shipping... "to and from" the U.S. to have one of our "engine people" here; run your 2 cylinder model, on "cox" fuel. You already have several people interested in your engine... and there's quite a large Cox community here in the U.S. You "may" be able to profit from a production-run, if the engine's performance is adequate.
We are all very envious of your skills!
Roddie
Re: my "twin bee"
Hi, Roddie, the fuel/air-flow is similar at the standard babee be. I'm not modified.
Maybe would be it better to put a carburetor
Maybe would be it better to put a carburetor
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
Re: my "twin bee"
Chris, in my opinion... a 4 cylinder should have a venturi size of a .15 to .20 engine (if using the Cox .049 cylinders) and large enough to bore-out, if there's still not enough air-flow.chris74100 wrote:Hi, Roddie, the fuel/air-flow is similar at the standard babee be. I'm not modified.
Maybe would be it better to put a carburetor
Maybe design a crankcase with the venturi in the "center"; equally feeding the 2 front and rear cylinders with a rotary-valve crankshaft supported with bearings?
There's always the consideration of the "mounting" provisions too. A "radial" mount would probably be better than "beam mounts". I've seen multi's with a "rear" intake... and this makes it difficult to mount the engine to a firewall.
I am sure that if "anyone" can build it... "you" can!
Roddie
Re: my "twin bee"
Lol, the 4 cylinders is 4x .20ci, (16cm3 in metric).
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
Re: my "twin bee"
Sorry Chris... I should have caught that in your previous post...chris74100 wrote:Lol, the 4 cylinders is 4x .20ci, (16cm3 in metric).
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
Re: my "twin bee"
I've never seen somebody make a tap himself - And of such a fine thread. Very nice job!
lieven
lieven
OVERLORD- Diamond Member
- Posts : 1786
Join date : 2013-03-19
Age : 57
Location : Normandy, France
Re: my "twin bee"
Nice shop you have there! I ran a "Blake" grinder years ago, for a small local tap company. The machine was for grinding the "flutes" in the tap. The abrasive wheel was "diamond-dressed" down each side, to the proper thickness, and then a "radius" was dressed on; which was frequently "re-dressed" as needed. There was a "rhythm/technique" that had to be mastered while "feeding" into the wheel and then "retracting"... that produced a finish; free of chatter/burn. When completing a piece, the "lands" had to measure within .003" of each other in thickness. It could be a bear to set up... especially with small stuff such as 000-120 pitch. You could almost "see through" the wheel, after dressing it into thickness for these.
Keep us posted on the 4 cylinder's development!
Roddie
Keep us posted on the 4 cylinder's development!
Roddie
Last edited by roddie on Sat Oct 26, 2013 11:06 am; edited 1 time in total
Re: my "twin bee"
Thanks, but this tap can only aluminium tapping.
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
Re: my "twin bee"
Watching with fascination.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: my "twin bee"
yes. same here.RknRusty wrote:Watching with fascination.
Phil
pkrankow- Top Poster
- Posts : 3025
Join date : 2012-10-02
Location : Ohio
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
Re: my "twin bee"
Very clean, indeed. You've got talent.
OVERLORD- Diamond Member
- Posts : 1786
Join date : 2013-03-19
Age : 57
Location : Normandy, France
Re: my "twin bee"
Very thanks
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
chris74100- Silver Member
- Posts : 66
Join date : 2012-08-17
Age : 55
Location : ANNEMASSE (FRANCE)
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