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Old 02-06-2010, 11:56 AM   #1 (permalink)
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Default crank rotation

If the rotor in the dist rotates CCW, then the crank would have to rotate CW (facing the engine). If the tensioner is supposed to be on the slack side, then this would mean that the tensioner should be on the drivers side of the engine. What am I missing here?
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Old 02-06-2010, 12:06 PM   #2 (permalink)
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Default Re: crank rotation

That's a good question.

I would hazzard a guess that it has to do with keeping tension during decelleration but that is just a guess.

Seen it on snowmobile engines as well, though.
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Old 02-06-2010, 12:16 PM   #3 (permalink)
ktm
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Default Re: crank rotation

The slack is on the passenger side.....have you seen the front of the engine with the front cover off? The crank spins CW which means it is pulling down on the cam from the drivers side.
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Old 02-06-2010, 12:55 PM   #4 (permalink)
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Default Re: crank rotation

ktm is correct... the crank sprocket is pulling the chain down on the cam sprocket on the drivers side creating tension on that side of the chain, thus the passenger side would be the slack side.
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Old 02-06-2010, 01:15 PM   #5 (permalink)
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Default Re: crank rotation

yes, a duh moment as I'm realizing the cam isn't driving the motion!

In regards to the timing on my turbo, what is the most degrees that the slots will allow it to be set btdc? And how do you measure using the indicator near the crank?
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Old 02-06-2010, 04:14 PM   #6 (permalink)
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Default Re: crank rotation

I think the direction the dist turns has more to do with the oil pump than the dist it's self. The worm gear on the crank could be made to turn the dist in either direction.
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Old 02-08-2010, 11:01 PM   #7 (permalink)
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Default Re: crank rotation

At idle it should be around 20 btdc on the turbo for timing. Did you swap out the dizzy and the oil pump shaft? If its not firing correctly you might have to drop the oil pump and turn the shaft one or 2 teeth. Trial and Error if the motor is in the car.
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Old 02-09-2010, 11:59 PM   #8 (permalink)
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Default Re: crank rotation

It fires, it runs, only really badly and really rich. I have checked nearly everything. Grounds are good (at ECU), spark on all 6, 6 firing injectors....
The only thing I haven't tested is the quality of spray from the injectors.
The dist is different than original, but the oil pump shaft is original....and alledgedly the engine ran and ran great before his ECU crashed (except for inj 4 which he had reversed the polarity on).
My question in this thread is what is the degrees setting at one end of adjustment of the dist?
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