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Old 04-03-2004, 19:24   #1 (permalink)
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motor differences

G'day all,
Just a few questions for all you technophiles out there.

I have an EL (I6)that was built March 98. I recently I found out that it has an AU motor in it, apparently the first of the AU motors were placed in the ELs or something like that.

Anyway, My son has an EF, and he has always maintained that my EL goes harder than his EF. What I would like to know is: what is/are the differences between the EF and AU (EL) motors?

When I bought a Crow cam for the car, Crow mentioned that it was an AU motor, and I had to use a different cam.

Also, the badge on the side of the car says "Computer Tourque Control" as it does on many, many other cars. But just what does that mean? I know that that is probably a really dumb question, but "curiosity... and all that.

A third question that i have is: a lot of the AUs were built to be LPG compatible, does this mean that they may have bronze valve guides?

Thanks
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Old 04-03-2004, 22:15   #2 (permalink)
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Re: motor differences

Just off the top of my head, the main differences were the crank, the head, the rocker ratio

The computer torque control refers to the dual runner manifold as far as I am aware
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Old 04-04-2004, 00:40   #3 (permalink)
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Re: motor differences

EF/EL are identicle apart from ignition system.

EL Hybrid has an AU head with EL bottom end

AU has diffrent crank/rods/pistons/sump
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Old 04-04-2004, 05:15   #4 (permalink)
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Re: motor differences

I have noticed that the EL has gone back to a distributor. Can you tell me what the head differences are? "Six in a row" has said the rocker ratio is different. I can only assume that it is a larger ratio to gain improvements.

Again I have seen an AU engine, and have seen the different sump. I don't presume to say my engine is an AU, but it must be a hybrid as you said Walkinshaw. When you say there are different crank & rods in the AU,did they stroke the AU?
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Old 04-04-2004, 05:38   #5 (permalink)
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Re: motor differences

No the rod is slightly longer and pin is slightly higher in piston and better bigger rod bolts to improve rod angle for higher reving engine.The mains had a stud girdle as well..
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Old 04-04-2004, 07:52   #6 (permalink)
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Re: motor differences

AFAIK serII ELs used the AU head on the EL block. Much like the late ED motors.
Therefore, your motor's basically had a very mild port, and bigger valves as well as a different rocker ratio.
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Old 04-04-2004, 16:44   #7 (permalink)
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Re: motor differences

very intersting!!!

Thank you all for your help
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Old 04-04-2004, 16:54   #8 (permalink)
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Re: motor differences

"Computer Torque Control" I'm pretty sure refers to the BroadBand Manifold.
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Old 04-05-2004, 00:01   #9 (permalink)
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Re: motor differences

O.K., you've sucked me in! Broadband manifold? Please explain?

The EF in our family has a very wide flatish sort of inlet runner, whereas the EF has a much narrower and more direct inlet runner. Is this what you are refering to?
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Old 04-05-2004, 05:42   #10 (permalink)
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Re: motor differences

Ah - sorry about that :-)

- no, you're describing the intake pipe (from airbox to Throttle Body). The Inlet Manifold - called a BroadBand Manifold on EF and onward I6's - is the scroll shaped setup on the side of the head. Inside that manifold there are 6 butterfly plates on a common shaft actuated by the cylindrical gizmo at the front. The idea of this design is to make the runners long for low rpm torque and then switch to shorter path for higher rpm (ie. greater than 3800rpm). The "shortening" is achieved simply by opening the butterflies and allowing the air to pass straight down to near the head ports rather than having to travel around the full length of the runners (the scroll shaped part you can see).
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