#3 cylinders

**Cribbs74** Sun Jun 01, 2014 12:16 pm

Not to beat a dead horse, but I wanted to do a sanity check and see if I was losing it. Perhaps all #3's are not created equal. It wouldn't surprise me.

The reason I was curious is that besides #4/5 cylinders #1/3 are my second favorite. I usually snap them up when I see them.

Anyway I had a #3 on a black widow....

#3 cylinders O6ao1kL

roddie Sun Jun 01, 2014 4:28 pm

ok.. that's a dual-bypass ported SPI piston/cylinder set there.. are they usually non-SPI.. or single-port... or both? This is something I'm just learning about. Huh...

dckrsn Sun Jun 01, 2014 5:49 pm

Yours looks like one of the #3s that may have
come on the Venom, Ron. The old thin wall doesn't
have the teeth of the thick walled one, I know. No sub-
induction, single bypass, no taper.
I'm going to try the old #3 on a nos BabeBee assy
I bought years ago. (I added the incorrect needle)

Hey, brand new Bee!
Report next weekend.
Bob

**Cribbs74** Sun Jun 01, 2014 6:53 pm

That would be a perfect pairing Bob.

**Cribbs74** Sun Jun 01, 2014 6:57 pm

roddie wrote:ok.. that's a dual-bypass ported SPI piston/cylinder set there.. are they usually non-SPI.. or single-port... or both? This is something I'm just learning about.

There are a lot of different cylinders. Best bet would be to visit the Wikipedia page. I don't think it's completely accurate, but it will give you an idea.

http://en.m.wikipedia.org/wiki/Cox_engines

**Admin** Sun Jun 01, 2014 7:03 pm

The number 3 seems to have been used on many different cylinders so there really is no telling exactly what the cylinder porting is by just the number.

dckrsn Sun Jun 01, 2014 7:30 pm

From Martin Hepperle's site.
#3
Open ports(not slit)
1 Bypass
0 Boost
NO SPI (later: YES)
Used in Mercedes car

I wonder how many different #3s are out there.

Bob

dckrsn Sun Jun 01, 2014 7:37 pm

And this from Joe Klause(to add to the confusion).
No.3. A two bypass cylinder that initially did not have the bottom of the exhaust ports milled low enough to provide sub-piston induction. Later, the exhaust milling permitted sub-piston induction, and the outside was ground for use with an exhaust-restrictor type throttle, and the top fin was milled.

Bob

**Cribbs74** Sun Jun 01, 2014 7:51 pm

That's too funny... lol!

The picture I posted above is a #3 dual bypass, SPI and not ground for an exhaust throttle.

I think Jacob is right the #3 can be just about anything.

dckrsn Sun Jun 01, 2014 8:05 pm

3 (three; /ˈθriː/) is a number, numeral, and glyph. It is the natural number following 2 and preceding 4.
That's it! cheers

Bob
edit: I just figured it out. The thinking at Cox may have been-It's not a #1 or #2, and definitly
not a #4 or #5........stamp a 3 on 'em. lol!

Next week, the #8!

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