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Fox 25BB
Do any of yall know if a diesel head is available for the current Fox .25BB engine??
Thanks in advance. Whoopee |
RE: Fox 25BB
I do not know of one at this time. Davis Diesel Development advertises diesel heads for the Fox .15, .45, .46, .50, .60 and .74 engines but he skips the .25's. You might contact Davis and ask him about it though. Maybe it was a oversight in his price list.
http://davisdieseldevelopment.com/price_list.html |
RE: Fox 25BB
Why not check out the source: www.davisdieseldevelopment.com the website doesn't show the Fox 25 on the product list but does list the OS 25FSR and 25FP-so the Fox may be available to special order (or may have been available in the past-he does say ask about discontinued models.............)
ffkiwi |
RE: Fox 25BB
I've tried to interest Mr. Davis in miaking a head for the .25 for a long time but so far, no go.
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RE: Fox 25BB
Actually, the Fox 25 is the only one that interests me out of the entire range due to its rotatable upper barrel.
Just curious to know if Fox or MVVS adopted that system first? Thanks. |
RE: Fox 25BB
Hard to say, I don't know when MVVS started doing it. But the Fox .19 BB engine did it before they came out with the .25 BB engine. I think if I remember right, the .19BB engine came out circa 1985, and the .25BB came out in 1989.
Also the Fox Eagle II, III and IV engines all have a rotatable upper cylinder block too. I did have a couple of III's set up for reverse exhaust when I was doing pattern years ago. I also did a III for left hand exhaust for a twin engine plane a long time ago too. Duke Fox actually setup my pattern engines for me as I was maybe the first to do it and he wanted to be sure the tips of the piston ring wouldn't catch in a port at the time. |
RE: Fox 25BB
I have an Enya 25X that also has a cylinder that can be rotated.
I don't know what the year of manufacture was as a mate retrieved it for me from a garbage tip! Great engine though! |
RE: Fox 25BB
MDS .17 and .18 have the same feature too, they are both nice engines that are a little underrated I think.
The rotatable fronts on the Enya's are nice features too, gives you an option to change the rotational direction of the engine (by a 90° change of the front). |
RE: Fox 25BB
ORIGINAL: earlwb Hard to say, I don't know when MVVS started doing it. But the Fox .19 BB engine did it before they came out with the .25 BB engine. I think if I remember right, the .19BB engine came out circa 1985, and the .25BB came out in 1989. Also the Fox Eagle II, III and IV engines all have a rotatable upper cylinder block too. I did have a couple of III's set up for reverse exhaust when I was doing pattern years ago. I also did a III for left hand exhaust for a twin engine plane a long time ago too. Duke Fox actually setup my pattern engines for me as I was maybe the first to do it and he wanted to be sure the tips of the piston ring wouldn't catch in a port at the time. 'ffkiwi' |
RE: Fox 25BB
ORIGINAL: ffkiwi ORIGINAL: earlwb Hard to say, I don't know when MVVS started doing it. But the Fox .19 BB engine did it before they came out with the .25 BB engine. I think if I remember right, the .19BB engine came out circa 1985, and the .25BB came out in 1989. Also the Fox Eagle II, III and IV engines all have a rotatable upper cylinder block too. I did have a couple of III's set up for reverse exhaust when I was doing pattern years ago. I also did a III for left hand exhaust for a twin engine plane a long time ago too. Duke Fox actually setup my pattern engines for me as I was maybe the first to do it and he wanted to be sure the tips of the piston ring wouldn't catch in a port at the time. 'ffkiwi' http://modelenginenews.org/cardfile/t25bbre.html |
RE: Fox 25BB
Rotatable top end isn't a new idea. The ancient (and much reviled) GHQ ignition engine had a bolted on top end.
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RE: Fox 25BB
Actually quite a few of the old classic engines had potentially reversable cylinders on them. Way back in the early days in the 1920's and 1930's.
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RE: Fox 25BB
ORIGINAL: earlwb Actually quite a few of the old classic engines had potentially reversable cylinders on them. But are you talking radial port here? (Time for a new thread really.) |
RE: Fox 25BB
Nope, but many old timey engines had a bolt on top end. OK .60's, Madewell, GHQ, Forster, all come to mind. One could likely convert a O&R engine over too, but it is more hassle as you have to remove the spot welded washers and turn the cylinder around and re-spot weld on new washers.
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RE: Fox 25BB
The split cylinder case design allows for shaping of the transfers more than anything.
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