What is the difference between a JDM engine and a UKDM engine
09-07-2015, 08:04 AM
#31
Not sure if this helps with the quest for an answer but my '03 (UK spec) engine has piston part number PCX-A01 stamped on the top. My new Spoon F22C short block also has this PCX-A01 piston set. Happy to supply pictures if required.
This short block came straight from Japan. I do know that this engine has an 11.8:1 CR when used with the Spoon HG, I think that is what takes the CR from 11.7:1 (JDM standard) to 11.8:1. The engine is standard, taken from AP1 JDM, then stroked up to 2.2L with AP2 crank and rods (bore x stroke = 87.00 × 90.7mm).
It could be that the AP2 pistons are used may explain why pistons are the same, but then where does the raised CR come from? As I see it (please feel free to correct me), this rules out the pistons since the PCX-A01 came on my UK spec AP1 and stroker JDM AP1 and the same bore/stroke is seen when comparing this stroked JDM AP1 to the AP2 (with 11.1:1 CR).
It's probably dangerous bringing an aftermarket modified engine into the equation but it may help since we all know Spoon have only mixed up and modified standard components.
This short block came straight from Japan. I do know that this engine has an 11.8:1 CR when used with the Spoon HG, I think that is what takes the CR from 11.7:1 (JDM standard) to 11.8:1. The engine is standard, taken from AP1 JDM, then stroked up to 2.2L with AP2 crank and rods (bore x stroke = 87.00 × 90.7mm).
It could be that the AP2 pistons are used may explain why pistons are the same, but then where does the raised CR come from? As I see it (please feel free to correct me), this rules out the pistons since the PCX-A01 came on my UK spec AP1 and stroker JDM AP1 and the same bore/stroke is seen when comparing this stroked JDM AP1 to the AP2 (with 11.1:1 CR).
It's probably dangerous bringing an aftermarket modified engine into the equation but it may help since we all know Spoon have only mixed up and modified standard components.
09-08-2015, 03:35 AM
#32
Registered User
Not sure if this helps with the quest for an answer but my '03 (UK spec) engine has piston part number PCX-A01 stamped on the top. My new Spoon F22C short block also has this PCX-A01 piston set. Happy to supply pictures if required.
This short block came straight from Japan. I do know that this engine has an 11.8:1 CR when used with the Spoon HG, I think that is what takes the CR from 11.7:1 (JDM standard) to 11.8:1. The engine is standard, taken from AP1 JDM, then stroked up to 2.2L with AP2 crank and rods (bore x stroke = 87.00 × 90.7mm).
It could be that the AP2 pistons are used may explain why pistons are the same, but then where does the raised CR come from? As I see it (please feel free to correct me), this rules out the pistons since the PCX-A01 came on my UK spec AP1 and stroker JDM AP1 and the same bore/stroke is seen when comparing this stroked JDM AP1 to the AP2 (with 11.1:1 CR).
It's probably dangerous bringing an aftermarket modified engine into the equation but it may help since we all know Spoon have only mixed up and modified standard components.
This short block came straight from Japan. I do know that this engine has an 11.8:1 CR when used with the Spoon HG, I think that is what takes the CR from 11.7:1 (JDM standard) to 11.8:1. The engine is standard, taken from AP1 JDM, then stroked up to 2.2L with AP2 crank and rods (bore x stroke = 87.00 × 90.7mm).
It could be that the AP2 pistons are used may explain why pistons are the same, but then where does the raised CR come from? As I see it (please feel free to correct me), this rules out the pistons since the PCX-A01 came on my UK spec AP1 and stroker JDM AP1 and the same bore/stroke is seen when comparing this stroked JDM AP1 to the AP2 (with 11.1:1 CR).
It's probably dangerous bringing an aftermarket modified engine into the equation but it may help since we all know Spoon have only mixed up and modified standard components.
09-08-2015, 03:50 AM
#33
Originally Posted by Flipz' timestamp='1441630846' post='23739400
Not sure if this helps with the quest for an answer but my '03 (UK spec) engine has piston part number PCX-A01 stamped on the top. My new Spoon F22C short block also has this PCX-A01 piston set. Happy to supply pictures if required.
This short block came straight from Japan. I do know that this engine has an 11.8:1 CR when used with the Spoon HG, I think that is what takes the CR from 11.7:1 (JDM standard) to 11.8:1. The engine is standard, taken from AP1 JDM, then stroked up to 2.2L with AP2 crank and rods (bore x stroke = 87.00 × 90.7mm).
It could be that the AP2 pistons are used may explain why pistons are the same, but then where does the raised CR come from? As I see it (please feel free to correct me), this rules out the pistons since the PCX-A01 came on my UK spec AP1 and stroker JDM AP1 and the same bore/stroke is seen when comparing this stroked JDM AP1 to the AP2 (with 11.1:1 CR).
It's probably dangerous bringing an aftermarket modified engine into the equation but it may help since we all know Spoon have only mixed up and modified standard components.
This short block came straight from Japan. I do know that this engine has an 11.8:1 CR when used with the Spoon HG, I think that is what takes the CR from 11.7:1 (JDM standard) to 11.8:1. The engine is standard, taken from AP1 JDM, then stroked up to 2.2L with AP2 crank and rods (bore x stroke = 87.00 × 90.7mm).
It could be that the AP2 pistons are used may explain why pistons are the same, but then where does the raised CR come from? As I see it (please feel free to correct me), this rules out the pistons since the PCX-A01 came on my UK spec AP1 and stroker JDM AP1 and the same bore/stroke is seen when comparing this stroked JDM AP1 to the AP2 (with 11.1:1 CR).
It's probably dangerous bringing an aftermarket modified engine into the equation but it may help since we all know Spoon have only mixed up and modified standard components.
09-08-2015, 04:33 AM
#34
Join Date: Jul 2012
Location: Peterborough
Posts: 254
Likes: 0
Received 0 Likes
on
0 Posts
You're right, shorter rods and longer stroke from the crank. I wasn't taking into account the additional capacity affecting the CR 
So this must mean the following pistons (with significant differences) are available:
1. JDM AP1
2. US/EU AP1 (PCX-A01)
3. WW AP2
Are we missing any other (OEM) ones?
So this must mean the following pistons (with significant differences) are available:
1. JDM AP1
2. US/EU AP1 (PCX-A01)
3. WW AP2
Are we missing any other (OEM) ones?
Thread
Thread Starter
Forum
Replies
Last Post