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Underdrive pulleys EF/AU 4 litre?? 

 

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 Post subject: Underdrive pulleys EF/AU 4 litre??
Posted: Thu May 22, 2008 4:46 pm 
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Hi guys, just out of interest does anyone make underdrive pulleys for E series 6 cylinder Falcons, like they do with the BA-F??
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Posted: Thu May 22, 2008 5:13 pm 
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nope.......(no i6 e series under drives).. unless you have a v8 e-series... -then they do...

 

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Posted: Thu May 22, 2008 5:17 pm 
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BA-BF 6s dont have underdrive 'pulleys' as such either, just an underdriven crank pulley.

 

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Posted: Thu May 22, 2008 10:20 pm 
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wat is this underdrive stuff they talkin abt
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Posted: Thu May 22, 2008 10:43 pm 
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badkiwi wrote:
wat is this underdrive stuff they talkin abt


different sized pulleys on the belts to "free up" engine power instead of driving the pulleys

 

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Posted: Thu May 22, 2008 11:43 pm 
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how funny i was looking for this the other day for my AU
but yea nothing for I6 that i found

 

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 Post subject: Re: Underdrive pulleys EF/AU 4 litre??
Posted: Tue May 22, 2012 10:16 am 
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wouldnt that make the alt. and water pump spin slower thus not work as well
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 Post subject: Re: Underdrive pulleys EF/AU 4 litre??
Posted: Tue May 22, 2012 11:02 am 
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the theory behind them is that the waterpump, alt and power steer etc.. are all over driven anyway so that they work at full capacity at idle, so you can under drive them a little bit with hardly any effect on the accessories, but to free up the horsepower used to drive the accessories..

 

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 Post subject: Re: Underdrive pulleys EF/AU 4 litre??
Posted: Tue May 22, 2012 1:25 pm 
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cboz wrote:
Hi guys, just out of interest does anyone make underdrive pulleys for E series 6 cylinder Falcons, like they do with the BA-F??


Whilst they might not make a specific underdrive kit, You may be able to source various pulleys that will fit that are smaller than the originals and will cause them to be underdriven. An example of this is, on my 5 litre V8 EF, I fitted an idler pulley off a Commodore because it was made of steel and the ford one was plastic, I think the most important things to check is the pulley width, the offset, and the internal diameter, if it's smaller and it fits, use it, but you need to make sure you dont underdrive things too much, The Falcon has a pretty standard power steering pump, so you might find that something from another manufacturer fits, for example, I know Chrysler and Holden used versions of the same pump, as did Cadillac in the states, the same goes for the alternator too, the one I think you'll have the most problems with is the water pump.

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 Post subject: Re: Underdrive pulleys EF/AU 4 litre??
Posted: Tue May 22, 2012 1:30 pm 
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Of course you would want the accessory pulleys larger, or the main pulley smaller, riiiight?

 

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 Post subject: Re: Underdrive pulleys EF/AU 4 litre??
Posted: Tue May 22, 2012 8:07 pm 
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I can get 15% underdrive balancers for AU 6 cyl, but we need to arrange a group buy of 10 minumum.
They will work out to just under $300 each for the balancer only + pp. You would also need to locate a suitable length belt to suit.
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 Post subject: Re: Underdrive pulleys EF/AU 4 litre??
Posted: Tue May 22, 2012 10:46 pm 
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66 coupe wrote:
I can get 15% underdrive balancers for AU 6 cyl, but we need to arrange a group buy of 10 minumum.
They will work out to just under $300 each for the balancer only + pp. You would also need to locate a suitable length belt to suit.

how much of a gain would be had? and these would fit the e series aswell?
would be good if someone already had a belt size so we knew what to use,

 

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 Post subject: Re: Underdrive pulleys EF/AU 4 litre??
Posted: Wed May 23, 2012 1:27 pm 
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gains can vary, underdrives generally will give average 5-10hp over std.
I cant advise a belt length because the last time we used the underdrive on an au motor we did not run the aircond
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 Post subject: Re: Underdrive pulleys EF/AU 4 litre??
Posted: Wed May 23, 2012 2:56 pm 
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I know for a fact Powerbond at least list them in thier latest catalogue.

 

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 Post subject: Re: Underdrive pulleys EF/AU 4 litre??
Posted: Wed May 23, 2012 3:09 pm 
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66 coupe wrote:
gains can vary, underdrives generally will give average 5-10hp over std.
I cant advise a belt length because the last time we used the underdrive on an au motor we did not run the aircond
not worth it really, when the standard balancer is only $100 brand new and the fancy one only gains 5-10hp. unless someone was chasing every single horsepower possible out of their engine

 

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