What size belt to delete smog pump? and how do you route it?

juiced_94gt

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#1

• Aug 3, 2007

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Im going to fire up the 331 tomorrow but i need a serpt. belt, what size do i need to eliminate the smog pump?? and how do you route it?? any diagrams?? i heard a 89" belt will work but wont go on the idler pullie on top of the motor?? i would like to keep the pullie working if at all possible.

 

The Green GT

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#2

• Aug 3, 2007

• #2

I have a diagram. Let me find it.

 

The Green GT

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#3

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Here we go.

 

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juiced_94gt

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#4

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Hey man thanks alot.

 

Dino Dino Bambino

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#5

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juiced_94gt said:

i heard a 89" belt will work but wont go on the idler pullie on top of the motor?? i would like to keep the pullie working if at all possible.

Click to expand...

I installed a 6PK2300 (90.5") when I deleted the smog pump. Initially it was fine but once it stretched, it wouldn't maintain adequate tension and it would screech when I switched on the AC. A 90" belt should do the job.
My current belt is 87.2" (2215mm) 'cause I have an ASP 26% underdrive crank pulley.

 

juiced_94gt

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#6

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Oh i have BBK underdrive pullies...does that make a diff?

 

Dino Dino Bambino

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#7

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It might do. While the crank pulley is smaller than stock, the alternator/PS pump/water pump pulleys will be larger than stock.
I suggest you get a piece of string and route it where the belt will go to find out the required length. Remember that your belt will need to be maybe 1/2" shorter than your string so that it puts the tensioner pulley under tension. It might take some trial and error to find the correct belt length as I found out with mine.