Bramage

As there are a number of Crankshaft Pulley Options, I have found it difficult to determine which belt is right for which application. Can those of you who have larger pullies share your thoughts?

Pullies:
168MM
175MM
180MM
185MM

Belts I have found listed for E55 applications:

ContiTech (For stock E55) 8K1289 50.74" (Same as Jaguar Belt)

Dayco (Stock Part #) 5080510 51.0"
Dayco 5080515 51.5"

Gates K080514 51.4"
Gates K080525 52.6"

Goodyear Gator 4080510 51.0"
Goodyear Gator 4080515 51.5"
Goodyear Gator 4080525 52.5"


So here we have a 2" difference from shortest to longest. I know that if you go to big you slip, and too small you shread.

What is best with a 180MM pulley w/ Smaller water pump pulley?

grantwoodtx

I have a 172mm pulley and phenolic spacers. A Gates K080514 just shreds for me while a K080525 seems a little long and occasionally under heavy acceleration pops off.

Anyone have any suggestions for this application?

Bramage

So based on the length, you need a 52" belt..

grantwoodtx

Is that assuming I have the smaller diameter water pump pulley ot stock water pump pulley?

Bramage

I based my estimate simply on length and symtom:

Gates K080514 is 51.4" It shreads


Gates K080525 is 52.6" and it falls off.

This tells me you need something in the middle... which would be 52"

lowprofile

Just a heads up. The s/c and w/p are on two different belt circuits. So, the w/p pulley size has no effect on s/c belt length.

Ali_E55

it is beeter to determine sizes by MM

like


stock S/C belt size is 1289mm

gates belts

k080514 = 52" = 1320mm
k080525 = 53 1/8 = 1351mm
k080530 = 53.5 = 1359mm.



i calculate it by this method.
stock is 152mm
mine is 189mm

so 189-152 = 37mm.

i have double spacers (wood 12mm, Phenolic 6mm) so total 18mm

you have to multiply by 2 because the belt cross it two times (going up and going down) = 36mm


so now the final E is

E = diffrence between pulley size + 2(lower spacer thickness) + stock belt size



for me E = 37 + 36 + 1289 = 1362mm. and than i choose the nearest size available which in my case was 1359m. which is k080530

Ali_E55

try by installing a smaller tensoiner pulley, it will help

although the 514 should be fine for your size.


the 525 slips because it is not 100% accurate as it is not strieght. i think some factory error.

dyno

LOL .. I was just wondering how could I ever make use of the new Contitech 8PK 1360 I have among my pulley things


ps: JAGUAR belt is not like stock, it's 1305mm

grantwoodtx

For me I calculated the following:-

Phenolic spacers = 6mm x 4 (for up and down length) =24mm
172-152 = 20mm
Stock length = 1289

So total = 1289+24+20 = 1333 or 52.5" which Should be the K080525.

OH BTW I just shredded the 525 belt again this morning and broke the tensioner housing.

grantwoodtx

The tensioner housing was scored and I couldn't figure out why.



I then looked under the coolant lines and found this...



Top of tensioner housing...



So now I'm thinking that under heavy accleration the tensioner was getting caught under the coolant line long enough for the tension to slack off and cause the belt to pop off.

Ali_E55

so it is a tensioner problem !!!

it is shredding because the tensioner pulley is not spinning i think.

i would recomend to replace it.

grantwoodtx

I am replacing the tensioner as it's broken and I THINK it was the tensioner getting stuck under the coolant tubes causing the tension to come off the belt.

py3000gt0

Any updates on this issue?

nabiel

hi my e 55 amg damper pulley broke,i had a engineer make up the front section of pulley where the supercharger belt runs on but they did not fit a rubber on it they also added additional screws for stregnth when fitted and cars on it gives a vibration my mechanic informed me that pulley needs balancing is this the case or should it be fitted with rubber,thank you

Blkvip

bumping this as i cant find my answer. with the Eurocharged pulley what belt is required?

Redbaron24

What size belt for 77mm should be used with stock crank and no belt wrap kit

failboat

bumping this because i can't find an answer,

have heard k080525 is the right size, but i ordered that and it was way too long....was about to order k080496HD but then heard that one member said it was impossible to fit on even with tensioner maxed out....

Please does anyone have info on this thanks

Donny Linton

80496 worked perfectly for me, 2yrs now and no problems. 11.6 in 1/4 mile

failboat

thanks Donny, to confirm you have a 77mm pulley? and does it make a difference if its HD or standard 496 with regards to length?

Donny Linton

Yes I have the 77mm and I just bought the standard not HD. Also I'm not using BWK