Can I just swap crankshafts? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

rc1honda · 02-22-2017, 09:03 PM

So I have a balanced and polished 91mm crankshaft sitting around.

Is it possible to just swap the 91mm shaft in for my stock 86mm?

I have a built SR with rods pistons bearings and ArP hardware. I want to swap in the 91mm shaft and make it a stroker motor.

Is it as simple as just installing the new shaft?

I've never dug into the bottom end before but it something I would like to learn as well.

hanzbrady · 02-23-2017, 07:14 AM

If you add 5mm of stroke with a standard size rod and piston what do you think happens?

The answer is no, you'll need custom pistons designed for a 91mm stroke because they're shorter.

02-22-2017, 09:03 PM	#1
rc1honda Zilvia Junkie Join Date: Aug 2008 Location: Chicago Age: 43 Posts: 433 Trader Rating: (5) Feedback Score: 5 reviews	Can I just swap crankshafts? So I have a balanced and polished 91mm crankshaft sitting around. Is it possible to just swap the 91mm shaft in for my stock 86mm? I have a built SR with rods pistons bearings and ArP hardware. I want to swap in the 91mm shaft and make it a stroker motor. Is it as simple as just installing the new shaft? I've never dug into the bottom end before but it something I would like to learn as well.

02-23-2017, 07:14 AM	#2
hanzbrady Zilvia FREAK! Join Date: Apr 2015 Location: Floriduh Posts: 1,166 Trader Rating: (4) Feedback Score: 4 reviews	If you add 5mm of stroke with a standard size rod and piston what do you think happens? The answer is no, you'll need custom pistons designed for a 91mm stroke because they're shorter. __________________ [email protected]