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1702 Three Fin Head Empty 1702 Three Fin Head

Post  Motra on Tue Mar 19, 2013 7:30 pm

What models came with a three fin high compression head? Does anyone know the story behind this head?
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Post  MikeM on Tue Mar 19, 2013 8:52 pm

i have 2 TD 049's from 63 and 65, and 1 o51 from 70 that came with the 3 fin...a few spares that are in real old packaging..................not sure why and when they removed one of the fins, but probably a cost related thing, or that the thicker walled cylinders just didn't need the cooling beefit of the third fin.

i think they are worth collecting.
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Post  Mark Boesen on Tue Mar 19, 2013 9:03 pm

The 1702 was standard on Tee Dees, not sure why only three fins, likely a heat issue. I don't think they really saved any money by deleting one fin.
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Post  MikeM on Sun Mar 24, 2013 7:06 am

some info i found on the 3 fin TD head..............looking at my stock confirms the combustion shape too.
the early 1702 3 fin is far left, the center is a standard 302 and the far right is a current 1702
the combustion shape is different from the early version to later version............
1702 Three Fin Head To458541702 Three Fin Head Om321761702 Three Fin Head Ch96229
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1702 Three Fin Head Empty 3 fin high commpression head

Post  getback on Sun Mar 24, 2013 8:17 am

i found alot of good info on this and other issuses at cof model engine wifipedia look up through google , they have pictures too1702 Three Fin Head 00212
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Post  Motra on Mon Mar 25, 2013 10:39 pm

Good info, thanks guys! Interesting to see how different the combustion chamber shape is between the early 1702 compared to the later.

I have a new three fin 1702 sealed in its original bubble pack. Is it better to leave it sealed or is it OK to open it and use it on a display engine?
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Post  Cribbs74 on Mon Mar 25, 2013 10:53 pm

It's your head, if you think it would look better displayed on an engine then go for it. I don't think the three fin TD heads are super rare or anything just different.
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Post  RknRusty on Tue Mar 26, 2013 7:24 am

Platinum, like gold and titanium, is not very reactive with anything in the air, so it won't corrode if you unpack it and put it on display.

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