Math Challenge
 

Alright so are some of you know I have been working on a turbine housing issue. And well after finding that a 53mm turbine housing didnt fit on my 53mm turbine i was confused (it didnt fit over the turbine)

So i went through the possible combos and sure enough there is a 53.8 turbine wheel. So i crab my trusty (harbor freight) caliper and go at it. Sure enough its odd bladed so i cant measure directly. So I measure across two blades to a third blade (imagine a peace sign). Get 2.066in, 2.065in, and 2.065in.

I run the calcs and get a turbine wheel that is 54mm.
So is my harbor freight caliper right and were i have a custom turbine wheel that has no record of existing in any other turbo or is my caliper off
by
0.371747212%


Lets here your opinions, and if anyone wants to double check my math i would appreciate it.

Use 2.065in and 9 blades (so 40deg apart)

will do the math shortly, when I get done with my ME HW.

My harbor freight calipers were sent to a calibration group a while back... +/-.003 @2" +/-.006 @4" +/-.01X @6" I can't remember exactly what the 6" reading was... hence the "X". not shabby really seeing as how I got the calipers for $9.95 on sale.

The only math I'm doing right now in my dorm room involves the current -12* temp and -42* wind chill along with yesterday's +46* temps. That, and I don't quite understand the peace sign measurements.

I get 54.081 mm as the diameter of the turbine blade based on your 2.065 in measurement and a 9 blade turbine (40 degs between blades). That is about +0.003" from 54mm which is in the realm of measurement error (from your calipers). At 2.066 I get +0.004" from 54mm.

I would sketch it out but I am already up past my bed time :sleep:

Dead on thanks ZX-Tex, im pretty confident its a measurement error.

Sam, when you have odd even tooth/blade objects you can not measure directly the diameter because opposing each tooth would be a valley. So knowing the amount of blades (9) and the configuration (a circle 360 deg) you can measure from two blades across to one.

ZX your my favorite newb ever

Alright I got it now, just couldn't picture it in my head last night.

Bump for wanting more opinions on if its a custom turbine or measurement error.

Custom turbine? Dream on. My HF calipers have an offset at zero, so all measurements read slightly larger than reality.

Hey where have you been man? Busy?

Measurement error
or
User error :magna:

And...
How's the new house?
When's the party?
Gonna have beer n nekid girls?

Between work, a vacation, and buying a house, I haven't spent much time here lately.

I've been busting my ass getting it ready to move in. Can't wait to have a real garage, especially one I can get 4 cars in ;)

Beer and Boobies to follow.

:nono:

Congrats on the house!

Nice. LMK if there's anything I can help you with.