IanM

Just curious. Does anyone know the turbine inlet diameter of a KKK #8 (or #6, they are probably the same on the inlet side)?

NEVA951

26/8, about 47.5 mm ~ 1.87"

Olli Snellman

Compressor size is the same but #8 turbine size is bigger than #6

gt37vgt

are you sure Ollie? i thought just the rear housing was bigger

Olli Snellman

Do you mean turbine "8 housing is bigger but turbine wing is the same as #6? I don't see any advantage just to make turbine housing bigger but leave turbine wing untouched. I suppose i have to measure #6 & #8 wings to see if they are the same.

gt37vgt

yeh my under standiing is the 6 or 8 represents the AR ratio wich represents the size of the nossle that curves around and the discharge size as the gas hits the blades so a 6 is smaller and will have the gas hit with greater velocity for a given CFM BUT it genraly chokes the exhaust to much and the increase in exhuast manifold pressure offsets the possibly quicker spooling turbo ...
there is still a massive lack of direct comparisons ...
I still say Porsche considered #6 to small for a 250 hp engine why would any one want one

azbanks

26/6 inlet is two inches outer diameter. 26/8 should be the same.

gt37vgt

the turbine inlet is where the cross over pipe bolts .. and i concur they will be the same at the flange the # 6 will be smaller down the thout

lee101315

The only difference I noticed is on the turbine side.

brrgrr

Only the turbine exit is different. The #6 hotside also has a "flat spot" on it just above the turbine INLET. Clarks garage has a page on how to identify the two turbos.


K26-6 specifications:

Compressor Wheel: large OD:2.60”; small OD: 1.74”, depth: .87”; small OD Clearance: .04”
Compressor Housing: Exit ID: 1.63”, Exit OD: 1.96”; Intake ID: 1.78”, Intake OD: 2.01”; R: 2.0”

Turbine Wheel: large OD: 2.54”; small OD: 1.91”, depth: .92”; small OD Clearance: .06”
Shaft: OD ~10mm; Thread: M6
Turbine Housing: Intake ID: 1.88”; Intake bolt rectangle 3.00” x 1.50”; Exit ID: 1.97”; Exit bolt square: 2.50”, R: 2.5”

K26-8 specifications

Compressor Wheel: large OD: 2.60”; small OD: 1.82”, depth: .85”; small OD Clearance: .04”
Compressor Housing: Exit ID: 1.63”, Exit OD: 1.96”; Intake ID: 1.85”, Intake OD: 2.00`”; R: 2.0”

Turbine Wheel: large OD: 2.54”; small OD: 2.15”, depth: .93”; small OD Clearance: .06”
Shaft (same as K26-6)
Turbine Housing: Intake ID: 1.88”; Intake bolt rectangle 3.00” x 1.50”; Exit ID: 2.21”; Exit bolt square: 2.50”, R: 2.5”

IanM

Okay, so the turbine inlet ID is 1.88". Thanks.