Pulleys?????

[Wht00Lightning]

How do i tell what size lower and upper pullies i have on my L? I havent changed them since i got it and was wondering what they were and what the best set up for my motor would be.

5.4L DSS Long Block

*5.4L Super modular balanced to racing tolerances and blueprinted
*Level 10 race prepped block
*Billit aluminum Main Support System
*Custom ARP main studs
*Deck equalized and squared
*Deck plate bored and honed
*4340 forged 6.658" Full Floating H-beam Rods w/ ARP 2000 bolts
*Forged DSS #4615 Pro-Light pistons (max quench - 18cc)
*Forged crank with 4.165" stroke
*Moly E-916K rings
*Trimetal BB317J Rod Bearings
*Trimetal BC393J Main Bearings
*Complete port and polish PI heads
*Anderson F-42 AFM blower cam
*13 psi on stock EATON supercharger.

made 386/467 on dyno

anything would help. thanks

 

[mcarbine]

Measure the pulleys diameter and post it up and we can tell you how many lbs of boost it adds. Also there are a couple charts floating around with dimensions and how much boost they add. Type pulley chart in the search and it should pull some up

 

[Wht00Lightning]

top pulley is 3 1/4 inches and the bottom is 9in

 

[Wht00Lightning]

ttt

 

[wydopnthrtl]

9" is quite bit. I'd guess a 5-6lb.

btw, you don't have ported heads? Man that's where the power is.


I just put my engine back in two months ago. And with a stock upper & 6lb lower (jdm blue) I'm seeing 17-18psi in this cold 40F air. Last month at the track I was on a 4lb lower and was seeing 14psi pulling up through 2nd & 3rd.

(my engine specs are linked from my web page)

Rich

 

[04dsglightning]

top pulley is 3 1/4 inches and the bottom is 9in

3 1/4 is larger than stock for the upper(if you measured right)lol

9in lower is a 6lb pulley

stock lightning upper is 2.93

number seem low for your combo..even with a eaton you should be making 450-475 hp with those mods

are your numbers sae or corrected?

 

[Lightninglee]

My blower pulley measure 3 1/4 and mine is the stock 2.93.

 

[_XXX_]

Lower pulley sizes

--------------------------------------------------------------------------------

7.5 inches = stock
8.0 = 2lbs
8.25 = 3lbs
8.5 = 4lbs
8.75 = 5lbs
9.0 = 6lbs
9.50-9.75 = 8lbs

Add approx .5 inches for every 2 lbs.

Old post from Lightning Larry

Check the How to's This is where this is

 

[Scuba-Matt]

My blower pulley measure 3 1/4 and mine is the stock 2.93.

Thats because your measuring the outside lip, not the top of the groves. The lip sets up a little more than 1/8 of an inch.

 

[Wht00Lightning]

9" is quite bit. I'd guess a 5-6lb.

btw, you don't have ported heads? Man that's where the power is.


I just put my engine back in two months ago. And with a stock upper & 6lb lower (jdm blue) I'm seeing 17-18psi in this cold 40F air. Last month at the track I was on a 4lb lower and was seeing 14psi pulling up through 2nd & 3rd.

(my engine specs are linked from my web page)

Rich

Yes, i have ported and polished heads

3 1/4 is larger than stock for the upper(if you measured right)lol

9in lower is a 6lb pulley

stock lightning upper is 2.93

number seem low for your combo..even with a eaton you should be making 450-475 hp with those mods

are your numbers sae or corrected?

I think it is a conservative tune. I am going to get a 8# lower, 2.70-2.93 upper, and port the eaton and retune it. then we'll see what it makes.