Pistons for m20 Stroker

[zaq123]

:D

That would change the length from piston pin center to pocket end 43,935mm
(Ok its deeper than the original 44,3 - but the look doesnt fit to the original. And yes, the other things are correct.)

what? sorry

[.n0iz4!]

this is how I understand it. Courtesy of AutoCad 2019 edition.
]

:D

That would change the length from piston pin center to pocket end 43,935mm
(Ok its deeper than the original 44,3 - but the look doesnt fit to the original. And yes, the other things are correct.)

Edit: One moment. ill correct.

(Piston pin center to valve pocket bottom)
Original Mahle Piston 8,8:1 = 44,3mm
Original Mahle Piston 9,7:1 = 43,7mm

With your idea it would be 43,935mm and looks like this:

[zaq123]

this is how I understand it. Courtesy of AutoCad 2019 edition.

[.n0iz4!]

you are measuring ~5mm from the dome height. Wiseco gives you the depth from the deck height (piston deck)

Ok, from Pistondeck, to vertical deepest point, right?




Looks like this...
better, but does not seem to be completely correct. (Depth 43,7mm to Piston Pin Center)

[zaq123]

you are measuring ~5mm from the dome height. Wiseco gives you the depth from the deck height (piston deck)

[.n0iz4!]

wiseco typically gives you their piston's dome and valve pocket spec. My understanding is TE is the top end of the piston and the intake pocket is down "-" 2.667 mm from piston's top end at the specified angle

The Angle is 22°. But the depth from there is around 5mm.

I dont know from where they measure


EDIT:

Mahle Original Depth (8.8)


Mahle Original Depth (9.7)


Best lookin is this: Intake 42mm in 22° Angle

[zaq123]

Hey Guys,

i'm from Germany and new here and sorry for my (bad?) englisch.
I dont want to open a new Thread, so i have a Problem.

Ive bought the Wiseco Pistons with 8.8:1 CR Pistons and wanna build a M20B28. I wanna increase the CR with changing the Dome Volume, but thats not the point.

I made a 3D-Modell with Solidworks but the" Valve Pocket Depth" is my Problem.
The Kit Specifications says: "DEPTH FROM TE: Intake: -0,1050 (-2,667mm)"

Does TE stands for Top End? But where the f**k is this?

Can someone help me out?

wiseco typically gives you their piston's dome and valve pocket spec. My understanding is TE is the top end of the piston and the intake pocket is down "-" 2.667 mm from piston's top end at the specified angle

[.n0iz4!]

Hey Guys,

i'm from Germany and new here and sorry for my (bad?) englisch.
I dont want to open a new Thread, so i have a Problem.

Ive bought the Wiseco Pistons with 8.8:1 CR Pistons and wanna build a M20B28. I wanna increase the CR with changing the Dome Volume, but thats not the point.

I made a 3D-Modell with Solidworks but the" Valve Pocket Depth" is my Problem.
The Kit Specifications says: "DEPTH FROM TE: Intake: -0,1050 (-2,667mm)"

Does TE stands for Top End? But where the f**k is this?

Can someone help me out?

[SkiFree]

IE/Mahle pistons? all clearances are in the booklet that should've came with the kit:
Piston-to-bore Clearance: .002 inches over the coating, measured at 7mm from bottom of skirts; Drag/Endurance racing applications : additional 0.001-0.003"
valve to piston minimums: IN- 0.080";EX-0.100"; radially-0.050"
piston to head: 0.040"- steel rods; 0.060"-aluminum rods

This.

Also, for posterity, I scanned the pamphlet and included other useful information in this google docs file. You should be able to download what you need from here.

https://drive.google.com/open?id=1aRSPzAuGtGjvpHVJJZI20A1fwGlRhHVS

[bradnic]

Pics?

[zaq123]

I got the pistons today ;D
Unfortunetly in the manuel they don't write how much bore clearance the pistons need
Do anyone have some information?

IE/Mahle pistons? all clearances are in the booklet that should've came with the kit:
Piston-to-bore Clearance: .002 inches over the coating, measured at 7mm from bottom of skirts; Drag/Endurance racing applications : additional 0.001-0.003"
valve to piston minimums: IN- 0.080";EX-0.100"; radially-0.050"
piston to head: 0.040"- steel rods; 0.060"-aluminum rods

[digger]

What Pistons ? If you mean IE best call them

[bmwmaster81]

I got the pistons today ;D
Unfortunetly in the manuel they don't write how much bore clearance the pistons need
Do anyone have some information?

[digger]

With the rhd intake, good head and appropriate cam you will peak closer to 7000

[apostate]

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