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Old 11-29-2004, 01:54   #1 (permalink)
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AU bottom end, what's the deal?

I did a search but got too many results to find anything.

What exactly is the go with the AU bottom end? Better balanced than E-Series, is that it? Would there be any advantage fully balancing an AU bottom end over an EL one?
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Old 11-29-2004, 01:57   #2 (permalink)
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Re: AU bottom end, what's the deal?

According to the god book there is no difference.
Bottom end specs are the same.
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Old 11-29-2004, 01:59   #3 (permalink)
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Re: AU bottom end, what's the deal?

THe au motor has more counter weights, better balanced.. Longer rods, lighter pistons, and bigger main bearings
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Old 11-29-2004, 02:07   #4 (permalink)
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Re: AU bottom end, what's the deal?

God damnit sorry was thinking of the V8 variety & didnt notice the inline 6 tech
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Old 11-29-2004, 02:07   #5 (permalink)
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Re: AU bottom end, what's the deal?

Specs have to be different. Redline on dad's AU2 is 6500 or something. E-Series tachos don't even go that high do they?

So an AU crank wouldn't go into an E-Series block? Will an E-Series sump go onto an AU block?
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Old 11-29-2004, 02:19   #6 (permalink)
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Re: AU bottom end, what's the deal?

u thinking 6 or 8?
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Old 11-29-2004, 02:22   #7 (permalink)
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Re: AU bottom end, what's the deal?

Quote:
Originally Posted by INJECTED250
u thinking 6 or 8?
looking at his Sig i would say its a 6.
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Old 11-29-2004, 02:25   #8 (permalink)
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Re: AU bottom end, what's the deal?

As i noticed its in the inline 6 area..
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Old 11-29-2004, 02:37   #9 (permalink)
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Re: AU bottom end, what's the deal?

Yeah I mean 6, if I was touching an 8 bottom end I wouldn't be bothering with stocko 302 stuff!
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Old 11-29-2004, 02:41   #10 (permalink)
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Re: AU bottom end, what's the deal?

According to Jim Mock, the AU is the best bottom end to start with for performance mods (its on his site sumwhere)...the counterbalances mentioned above have something to do with it methinks. I'd imagine that each time the spec of the engine changed, the cranks changed slightly.
Very few cars come out of a factory with a "fully balanced/blueprinted" crank. The E series XR6's are an exception tho....so there is probably somethign to be gained by blueprinting/balancing the crank...but probably not as much as u'd get from spending the same amount of money elsewhere.

NOTE: Blueprinting is where they grind off all the casting bits (seams?) and make it all nice n smooth.
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