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Any bennifit to an AU bottom endd 

 

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 Post subject: Any bennifit to an AU bottom endd
Posted: Wed Feb 29, 2012 6:56 pm 
Parts Gopher
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hi just wanted to know if their was any bennifit to running a AU bottom end in an EF, im going to supercharge my EF and hopeing for abit above 200kw i was just going to rebuilb my bottom end with ACL race bareings and maybe spool rods and leave it at that but a few people said au bottom end are stronger is this true ???? and why

any help would be great
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 Post subject: Re: Any bennifit to an AU bottom endd
Posted: Wed Feb 29, 2012 7:03 pm 
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I do know they run longer rods and shorter pistons.
This would play a part I would immagine.

 

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 Post subject: Re: Any bennifit to an AU bottom endd
Posted: Wed Feb 29, 2012 7:05 pm 
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Some info here on the 4L internals..

fordmods-technical-documents-diy-f38/a-look-at-the-sohc-4l-engine-in-detail-t85150.html

 

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 Post subject: Re: Any bennifit to an AU bottom endd
Posted: Wed Feb 29, 2012 7:32 pm 
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So what i got from that is AU bottom ends arnt worth it
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 Post subject: Re: Any bennifit to an AU bottom endd
Posted: Wed Feb 29, 2012 8:27 pm 
Getting Side Ways
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Super XR6 wrote:
So what i got from that is AU bottom ends arnt worth it


If your only goal is going to be 200-250kw, then yes an AU bottom end isn't worth the hassle.

Stock EF/EL rods are more then strong enough to do what you want them to, So are ACL race series pistons.

If you really have that much extra money add an atomic mains girdle and main studs to the E series bottom end.
At that power level an unported early head is a better option.

 

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 Post subject: Re: Any bennifit to an AU bottom endd
Posted: Wed Feb 29, 2012 8:55 pm 
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Yeh i got a tickford head so thats ok, do i need to do the piston or will the stock ones be ok how much for acl ones probly just rebuild the bottom end with acl bareings and arp of atomic studs sould be good for 250 hopefully
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 Post subject: Re: Any bennifit to an AU bottom endd
Posted: Wed Feb 29, 2012 10:31 pm 
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Which pistons you use will be determined by the amount of wear on the bores.
Get your machine shop to measure for taper and out of round.

A round and true bore with good ring fit will make more power the a worn bore.
Ignore the people that tell you there is no power in the bottom end.

 

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 Post subject: Re: Any bennifit to an AU bottom endd
Posted: Thu Mar 01, 2012 8:42 pm 
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yeh i know bores are pretty good 360km+ and still got the original cross hatchings on them
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 Post subject: Re: Any bennifit to an AU bottom endd
Posted: Thu Mar 01, 2012 8:59 pm 
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Super XR6 wrote:
yeh i know bores are pretty good 360km+ and still got the original cross hatchings on them



Thats not a guaranty that bores are good for a standard sized piston.
More often then not it's in the top 25mm of bore that the most wear is and that is the critical bit. Poor ring seal there will loose you power.
At that sort of Km the thought of trying to use a standard size piston wouldn't even cross my mind.

 

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 Post subject: Re: Any bennifit to an AU bottom endd
Posted: Thu Mar 01, 2012 9:24 pm 
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Super XR6 wrote:
So what i got from that is AU bottom ends arnt worth it


i wouldnt say it isnt worth the hassle, yes ef/el rods are slightly stronger but if your going with spool rods i would go with the au bottom end for the added rigidity from the sump bolting to the main caps..
in saying that ive been getting around 270rwkw on a stock au bottom end at 12psi for over 2 years now..
maybe im pushing the limit a bit, but its holding in there.. :)
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 Post subject: Re: Any bennifit to an AU bottom endd
Posted: Thu Mar 01, 2012 9:34 pm 
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TROYMAN wrote:
Super XR6 wrote:
So what i got from that is AU bottom ends arnt worth it
i wouldnt say it isnt worth the hassle, yes ef/el rods are slightly stronger but if your going with spool rods i would go with the au bottom end for the added rigidity from the sump bolting to the main caps..
in saying that ive been getting around 270rwkw on a stock au bottom end at 12psi for over 2 years now..
maybe im pushing the limit a bit, but its holding in there.. :)/

cough cough :lol:

 

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Last edited by bry40l on Fri Mar 02, 2012 8:12 am, edited 1 time in total.

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 Post subject: Re: Any bennifit to an AU bottom endd
Posted: Thu Mar 01, 2012 10:03 pm 
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bry40l wrote:
TROYMAN wrote:
Super XR6 wrote:
So what i got from that is AU bottom ends arnt worth it


i wouldnt say it isnt worth the hassle, yes ef/el rods are slightly stronger but if your going with spool rods i would go with the au bottom end for the added rigidity from the sump bolting to the main caps..
in saying that ive been getting around 270rwkw on a stock au bottom end at 12psi for over 2 years now..
maybe im pushing the limit a bit, but its holding in there.. :)[/quote]
cough cough :lol:


i originally only expected 6 month out of it from what people were saying..
2 years later its still making the same power.. :D
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