VH41DE crank in Vh45de Block question.

[Drift-wood]

So from everything I have read.
The US VH41DE and the US VH45DE cranks should be 100% interchangeable.

I want to take a VH45DE and put a VH41DE crank into it.
My question is as follows...
Do I need VH41DE rods and pistons or can I use the VH45DE rods and Pistons?

I do not know what Nissan used to compensate for the de-strokeing of the motor.
Did they use shorter rods with pistons that had higher wrist pins..?
Did they use longer rods with the same pistons wrist pin specs..?

If anyone can give me more information about this please let me know...

essentially i'm trying to build a JDM spec VH41DE lol using a hog posh of parts from here...
I can get access to vh41's and 45's really easily.

[redhat-z]

VH41DE
- Bore 93.00mm
- Stroke 76.00 mm

VH45DE
-Bore 93.00mm
-Stroke 82.70mm

I'm still looking for the wrist pin heights and crank journals of both engines to answer your question. My guess is shorter rods.

[Drift-wood]

I'm actually hoping the journals are the same and the vh45 rods are just longer. That would make me happy lol.
I'm still in planning stages but I want to get a 2:1 r/s or close. Ou of the box I remember seeing the vh41de is something like 1:1.8 if I recall right.
I wan to make my vh sing only problem is getting the springs and cams I need.

[kingkilburn]

I really wish Nissan would have stuck with the KADE's valve train instead of the SR. Way to many moving parts involved. Something is bound to go flying off when you try to spin them up.

[redhat-z]

The difference is in the Crank Journal Center to Crank Centerline ("r") in the FSMs,
VH45DE 41.31mm - 41.39mm (page EM-48 1994 Q45 FSM)
VH41DE 37.996mm - 38.004mm (page EM-62 1998 Q45 FSM)

So since the center distance of the journals is further out from crank centerline on the VH45, there is the stroke difference.

[Drift-wood]

Do you know the rod lengths for both engines?
I still can't make up my mind vh or rb swap.
I know I want more than a ka-t setup can yield.
The only requirement I have is keeping a/c and power steering. I just never see vh41/45 swaps with functioning a/c...
I also find that my total potential is lower with the vh because I can not fit any type of reasonable forced induction method on it and keep the under hood looking factory.

[redhat-z]

94 VH45 Big end center to Small end center
146.95mm - 147.05mm

98 VH41 Big end center to Small end center
146.95mm - 147.05mm

[Drift-wood]

So then they used lower wrist pin location to make up for the shorter stroke?
Or was the block shorter on the vh41?

[redhat-z]

Both blocks from crank center to the top of the deck (either bank) is 220.35mm so the wrist pin height might be different. Keep in mind the the VH45 has 10.2:1 compression while the VH45 has 10.5:1. I still can't find the actual piston dimensions but I think Mettler or Wes might have this data.

[Drift-wood]

I would think it's safe to say it's in the wrist pin.
Which kind of sucks if I recall correctly.
Or was it better to have the wrist pin lower.