counter rotating engines?

[racclarkson@gmail.com]

Lest we forget.

[dottieshusband]

On my 12v71ti, 1987, the port engine is CCW. And I only know this because the Delco 50mt starter motor is clearly marked "CCW"... I don't think there is any real difference between the engines... fuel pump maybe.. starter motor for sure.

[racclarkson@gmail.com]

On my 12v71ti, 1987, the port engine is CCW. And I only know this because the Delco 50mt starter motor is clearly marked "CCW"... I don't think there is any real difference between the engines... fuel pump maybe.. starter motor for sure.

Wouldn’t you need a CCW starter to crank a CW motor?

[Photolomy]

The model numbers on the engines will tell you which is which. From my manual...

PORT: 70823300 = 7 (V71) 08 (8 Cylinders) 2 (Marine) 3 (CW) 3 (Turbo) 00 (Model)
STBD: 70827300 = 7 (V71) 08 (8 Cylinders) 2 (Marine) 7 (CCW) 3 (Turbo) 00 (Model)

I don't think the transmissions alter the direction, but are designed for the power input direction.

http://engine.od.ua/ufiles/DETROIT-M...ial-number.pdf

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[oscarvan]

So I looked at the large unused pulleys on the front of the engines..... inboard rotation it is.

[dottieshusband]

Wouldn’t you need a CCW starter to crank a CW motor?

Heck, IDK, but when I overhauled that engine I put a LH, CCW fuel pump on it and it runs OK!

[Dan Mapes]

We had 6-71TIs in our '85 43' MY and they spun opposite each other with Capitol gears. They had different part numbers for all sorts of things like circulation pumps.

[Fanfare]

And cam shafts, I think? Alternators have integral fans but I don't think the direction of airflow matters. The geared fuel pressure pump before the injectors? The injectors themselves run off the camshaft so OK once the cams either go opposite or have different grind profiles. I'll have to think a little more on this.

[Dan Mapes]

On the 6-71 I think the blocks and heads may have been different as well. Inspection covers were outboard side on each engine.

[rsmith]

An old Italian friend of mine that had a 46 used to say the ccw engine always wears out first because it runs against nature.