So about a year ago i got my 2004 mcs through a trade. I've come to love it and i'm starting to want to put money into it. (pulley, intake, etc) but i know it has an aftermarket pulley already. I cant for the life of me figure out the size or the brand. It's pretty dang small, is silver, and has an etched "et" in the center of it. Anyone by chance know the brand or the size?

 

Pic would be helpful

 

A picture would help to identify the pulley.

 

here are a few

 

I guess it's a brand that used to exist, some details on it will come up Ina. Google search.

 

Do you have any way to measure boost? That would be an easy way to figure out what size it is.

 

I do have an autometer boost gauge. i peek at about 13psi

 

The tensioner is Litens, cant tell looks like an older version of something based of the simplicity and the solid face.

 

does that mean that the tensioner has been replaced before? And from what i'm finding out i think the pulley is german. is there any way to find out the reduction amount though?

 

From the smooth face and the number of holes, it looks like a KAVS pulley. Unfortunately, the pulleys don't seem to be clearly marked by size and they make a bunch of sizes. Their website shows 5%, 10%, 11%, 13%, 14%, 15%, 16%, 17%, 18%, 19% and 20% for the R53. I would email them to see if they can provide any info from the pic, or on how to determine the size.

info@kavsmotorsport.com

 

Cooper S stock: 65mm (belt 6PK 1388)
JCW & Kelleners(11%): 58,2mm (belt 6PK 1370 (oder 6PK 1374 ?))
Digitec(DT) & RMS: 57mm
Hartge &
hitec incl. MTH(13%): 56,5 mm
Minimania 15% (Ultrik): 55,6 mm
Alta (15%): 55,5 (belt 6PK 1370)
GTT 17%: ?54?53,2??
GTT 15%: 55,8mm (belt 6PK 1365)
Schäfer: 54mm
Alta (19%): 52,5 mm ??? (belt 6PK 1352)
M7 (16%): ?????

 

xsmini just posted the size below, no that's OEM original tensioner from the looks.