Can someone tell me what the diamter of a 6# and 8# pulley are? I was told the pulley i have is an 8#er but its only making the boost of a 6#er. The diameter of it (JLP Pulley) is 9 & 3/4". I thought the 8# pulley was 10"....or is that just an estimation and it is really 9 & 3/4"????

So, if ya'll can and will, please measure your 6# and 8# pulleys.

thanks in advance!
justin

 

it depends on who makes the pulley as to the diameter of a "6lb" or "8lb" pulley.

some vendors/manufacturers use different sizes for the same "lb" rated pulley.

the lb rating is not accurate anyway.

but if it helps I THINK the Metco one piece (not the interchangeable outer ring style) goes like this:

6lb = 9.5inches
8lb = 10inches

these are the one piece style that JDM sells, i'm not sure about the other vendors.

it also depends on where you and/or the vendor or manufacturer are taking the measurements.

also, the boost # will vary your mods, so you could have an 8lb, but with long tube headers and ported heads (just as an example, you could show less boost) or vice versa, a 6lb with a ported blower showing more boost.

it will also vary with weather conditions (ie: temp and barometric pressure)

I know this doesn't help much, but good luck.

later,
chris

 

the pulley is a JLP one. The only mods i have done is a 12" cone filter, Magnaflow catback, chip, and pulley. The measurement i was taking was from outtermost ridges of the pulley...so actually, where the belt sits, will not not be a full 9& 3/4".

 

JDM pulleys are larger diameter than anyone elses/ at least their caged pullies are.

a JDM 4# is very very close to a REM 4#.

 

i think most 6lbers are 9"



p.s. thanks for the tb