bgstew6

feel free to add....confirm or deny....

all belt part numbers....for gatorback 4080xxx IE 69 inch belt 4080690, 69.5 inch belt 4080695
for gates k080xxx

(L)stock Lower 7.5/stock upper 2.93-66" belt
(HD)Stock Lower 7.5/stock upper 3.25-67" belt

stock lower/2.75" upper/stock idlers-65.5" belt
stock lower/2.8" upper/stock idlers-?
stock lower/3.5"upper/aux idler w/90mm and 100mm-69"

4lb (8.5") lower/2.75" upper/stock idlers-
4lb lower/2.8" upper/aux idler/90mm and 100mm-68.5"
4lb lower/2.93" upper/stock idlers-67.5"(very tight)
4lb lower /2.93" upper / aux idler with 92mm and 100mm idlers - 68.5" (tight)
4lb lower/3.5" upper/two 90mm idlers-68.5"
4lb lower/3.5" upper/aux idler/two 90mm idlers-69"
4lb lower/3.25" upper/stock idlers-68.5"

5lb lower/3.5" upper/stock idlers-68.5"


6lb (9") lower/2.7"upper/stock idlers-68"
6lb lower/2.7upper/MP idler/tensioner tab removed with two 90mm and one 100mm-69.5"
6lb lower/2.8/100 mm Billetflow with bracket - 69.0"
6lb lower/2.93 upper/stock idlers-68.5"/69"
6lb lower/2.93 upper/Aux Idler w/two 100mm-69.5"
6lb Lower/2.93 upper/ magnum powers bracket w/2-100mm, 1-90mm, reichard tensioner-70"
6lb lower/3.25 upper/69"(tight)
6lb lower/3.25 upper/METCO idler pulley kit with 90mm pulley-70"
6lb Lower/3.25 upper/Magnum Powers Idler Bracket with 3 90mm Idlers, tab removed, 69.5"(Tight)
6lb Lower/3.25 upper/Magnum Powers Idler Bracket with 3 90mm Idlers 71
6lb lower/3.5" upper/90mm idlers-69.5"

8lb (9.5") lower/2.93 upper/Metco aux idler w/two 100mm-69"
8lb lower/2.75" upper/stock idlers-67"
8lb lower/2.80" upper/aux idler w/two 90mm-69.5"(tab removed)
8lb lower/3.25" upper/stock idlers-68"
8 lb lower/3.5"upper/aux idler w/two 90mm/tensioner tab removed-69"

10lb (10")lower/2.93 upper/stock idlers-72"
10lb (10") lower/2.75 upper/stock idlers/tensioner tab removed-69"

Cogged setup
6lb lower/2.9 upper/MP Idler bracket/90mm idler pullies (x3), broken tensioner tab 17608MGT30, 69.2"(tight)
6lb lower/2.7 upper/MP Idler Bracket/90mm idler pullies (x3), broken tensioner tab 17608MGT30, 69.2

Acc belt
stock pullies 99in
Underdrive pullies (pwr steering, water pump) Napa Gates #25-081035

will keep this cleaned up after posting so dont get mad if your post gets deleted....

Don't H8

4lb lower / 2.93 upper / aux idler with 92mm and 100mm idlers - 68.5" (tight)

this is an awesome idea and chart! very helpful!

Don't H8

2 belt lenghts for to add...both with tensioner tab broken off:

stock lower//whipple 3.0 upper//stock idlers = 66"
4lb lower//whipple 3.4 upper//92mm idlers = 68"

as I play with the whipple pulley ratio more, I'll be sure to post up the belts I'm collecting. LOL!

bgstew6

whipple, KB, MP , eaton.....all upper pullies should be centered in the same place, so no need to worry bout what type of SC is on....

Just the pulley sizes themselves and idler kits..and idler pulley sizes...

Don't H8

werd! i know i said stock idlers, but it is also with the stock idler bracket...not aftermarket style.

DallasGT01

<~~ 10" lower STOCK upper 72"s with tensioner mod...

not real tight but it will do till the 100mm idlers get there...

bgstew6

so if you bought a 71 in belt it would be perfect

DallasGT01

i Bought a K080720

A K080710 WOULD BE PERFECT!!!!

more rather if they do make a 4080710 would be better since it would be a GATORBACK belt then....

when i goto the L upper i will let you know if i need the 71 belt...

i think with the 100mm idlers i will be okay hope....

we shall see...

DallasGT01

http://modularfords.com/forums/f17/g...rce-13223.html

that is the gates belt part numbers

K080720
4080720

K0 means it is a Gates
40 means its a goodyear gatorback

8 means its a 8 rib belt...

then the 720 means its a 72 inche belt....

bgstew6

Yeah I forgot to put the K0 of 40 reference for Gates or Napa....I probably have put it in about a dozen or more posts over the years but forgot to put it here...thanks for reminding me LOL

DallasGT01

2003 Harley Davidson

2.75 upper
stock idlers
tensioner mod
10 lb (10") lower

KO807690 = a 69" belt

RedFox

How about 2lb lower with 2.7 upper.

What length do I need for this?

DallasGT01

i would prob say with the tensioner mod you would need a 65" belt... maybe you can run the stocker... but i doubt it...

Try a 64 first...


k080640 (64")
k080650 (65")

RedFox

A stock Lightning with 7.4/2.93 uses a 66" belt. A 2.7 upper will work well with this length. Adding a 2lb lower requires a longer belt. What's the next step up, 67 or 68"?

DallasGT01

i am running a 69 inch belt with a 10" lower and a 2.75 upper and i did the tensioner mod alittle to far....

i think you will be fine.. goto oreilys and have them order a 65/66/67 inch belt...

then go in the next day and play with them all.. the tightest one is the one to use...