well then, one of us is wrong..

i have this:
(CRANK DIA x 3.45 (or3.6 for v2) x RPM@ SHIFT) / PULLEY DIA

or go here:
http://www.vortechsuperchargers.com/...d%20Calculator


what are you using / getting?

Vortech V-5 F-Trim Supercharger

Max Speed:
52000 RPM

That alone tells us that with a 4:1 setup up ratio on the inside of the supercharger thats a 13,000 rpm max. 52,000/4 The info on the 4:1 is somewhere on vortech's website.

I am using the forumla (drive pulley diameter x rpm) / (driven pulley)

12psi pulley = 65mm
crank pulley = 120mm

(123 x 6300) / (65) = 11921rpm

Not sure if my crank size is perfect i forgot what i measured it to be. But either way just doing 52000/4 = 13000 sums it up.

Even when i told them i need something to go as high as 15000 without oil the bearing manufacturers said that was very high for that type of bearing without oil. 13500 was hard enough to find and thats done using a contact=less seal, more susceptible to dust, but our housings are pretty much sealed anyway. Even then i was told to do yearly inspections of the bearings because thats alot of stress for them.

Vortech V-5 F-Trim Supercharger

Max Speed:
52000 RPM

That alone tells us that with a 4:1 setup up ratio on the inside of the supercharger thats a 13,000 rpm max. 52,000/4 The info on the 4:1 is somewhere on vortech's website.

I am using the forumla (drive pulley diameter x rpm) / (driven pulley)

12psi pulley = 65mm
crank pulley = 120mm

(123 x 6300) / (65) = 11922rpm

Not sure if my crank size is perfect i forgot what i measured it to be. But either way just doing 52000/4 = 13000 sums it up.

Even when i told them i need something to go as high as 15000 without oil the bearing manufacturers said that was very high for that type of bearing without oil. 13500 was hard enough to find and thats done using a contact=less seal, more susceptible to dust, but our housings are pretty much sealed anyway. Even then i was told to do yearly inspections of the bearings because thats alot of stress for them.

i aways thought

9.5 pulley= 65mm

thats what nst site says

http://www.skf.com/skf/productcatalo...did=1050240205

Thats the skf reference, i'm looking at my oem bearings and they are skf 6205 - 2rsh thats an 8500 rpm bearing!

yes your right 55mm is 12psi i believe. that would make the number 14,089 @ 12psi

I see max speed of 65k.

If you check the calculator on the Vortech site you get different results (posted above), and if you check their spec sheet PDF:
http://www.vortechsuperchargers.com/...e=scmatrix.pdf

The spec sheet has a footnote. It shows the formula with a multiplier (3.45) ...close to your 4:1 ratio..but that is being applied to reach a higher number...

still don't know who is right.

it would be sweet if you go in the roots s/c direction....cuz NO ONE has it..and the power it will make is unknown...and it should make descent power...more than the centrifugal

65k absolute max it says, i'm guessing that will be usng the 20 psi max of the blower. Either way both of our numbers are way higher than the 8500rpm the oem bearings are rated for!

just an fyi, reading all this math is hurting my head.

THANKS A LOT GUYS!

p.s. this was my way of saying *watching.....* but I had to make it interesting.

p.p.s. I hate math & my headache was no lie.

yes of course that is at the max. hitting the max will depend upon the application.

but i am curious as to why vortech and skf are so far off. it's the multiplier that vortech adds.

i have to believe vortech since it's their unit. also, are you sure that was the part number on the OEM piece? I have seen a lot of slight differences/interchanges in the part numbers, a single letter or digit is a big deal. and some don't show it and yet there is a slight difference in ABEC rating (as important as speed rating).
I have to believe at least on the blower it's correct to the right tolerance, since that comes from vortech. on the jackshaft/pulley side, not sure..but i find it hard to believe they would go with such a low rating.

thats what the part number says, i'll call SFK when i get a chance and confirm. But what i'm telling you is that a shieled ball bearing that is non ceramic and goes past 13500 is non existent. in the size we need.

i think i have seen up to 18k in casual searches. much higher, yes you have to go hybrid.

I did quite a bit of searching and I actually called up sfk, nkg, belden, koyo and talked with the engineers and explained what the bearing is used for etc. 6205 metal ball bearing 13500 is the highest any of them had available.

And those are like $35 a pop the stock ones are less than $20 i think.

Very interesting.

Wow, you guys sure are putting a lot of work into this. Thank god because apparantly TRD didnt.

:P

Lol who knows who is to blame here, Vortech makes the whole supercharger. Dunno if its a design flaw on trd's part or not but it looks as if the bearings/shaft are not quality parts. Either way TRD = scum for not willing to fix this problems that many of us are having. :no:

How many people have problems when stock?

ALOT :lalala:

IC IC