my 1uz supercharging power gains

[cribbj]

hi

i wonder if there are variations in crank pulley sizes ?

it must be pulley sizes , either on the blower or the crank shaft
thats the only real way boost can be that much different ?

very interesting ,
maybe someone else out there can shed some light on this ?

ewan

AFAIK (and confirmed from Lexus parts technicians FWIW) all early 1UZ's had a 140mm crank dampner.

I did also confirm that the early 2UZ's, have a 157mm.

I don't have any information on the later 1/2/3UZ's VVTi motors.

 

[SuperRunner]

I have a 2002 2UZ, and it is the same size as the 1uz.

I also have a 2005 vvti 2uz, but I will have to check it later today.

 

[cribbj]

Hmmm, I may have it backwards then. I have a larger crank pulley, which the Toyota guys told me came off the earlier 2UZ engine.

 

[SuperRunner]

Nope, both early and later have the smaller pulley.

3UR has about a 157, but the 1UZ crankshaft if much too large and wouldn't leve much meat if you were to have it machined. Nice thing about the 3UR, is that it is an 8 rib.

 

[cribbj]

Just checked RockAuto, which of course is THE authority on parts, right?

I checked 2UZ's from '98 up to when they were replaced with UR's, and they all supposedly use a 6 1/8" dampner.

Oddly, the site didn't have dampners for the 1UZ's, neither early nor late model.

I do have a dampner out in my garage which is supposed to be off a 2UZ, and it's 6 1/8". It's an 8 rib, and it fits on my 1UZ crank, as I've already run it on engine #1 with 20psi of supercharger boost.

 

[SuperRunner]

Got a 2005 2uz in my garage, and a 2002 2uz in my Sequoia, and both are 5.5 and 6 rib.

So, wanna sell my your 6 1/8"