Jump to content
SAU Community

Recommended Posts

So im rebuilding my motor and have done multiple searches to no avail.

I'm trying to track down part numbers for over sized JE Pistons for my neo motor, but can't find them anywhere.

I'm sure people have rebuilt 25s with JE before. Am i wrong?

Does anyone know the part number or someone who does?

Link to comment
https://www.sau.com.au/forums/topic/452349-je-pistons-for-neo-rb25det/
Share on other sites

Shouldn't need part numbers - just tell your supplier what you want and they should be able to procure. They may not be in stock anywhere and have to be made to order.

Having said that I haven't seen JE pistons mentioned in a build lately.

Just something to note. Nitto forgies are manufactured by JE. The difference in the piston from Nitto to JE was 1cc in the dome but about $150 difference off the shelf.

HiOctane sold them to me for $1200 I think. maybe $1300

yen the machines I gave my block to said he could get JE cheaper than CP.

Knowing JE is a good brand I agreed, but I also like to do my own research and can't find them anywhere.

I specified multiple times that it is a NEO motor and has different compression ratios, so just hoping he orders the right pistons.

To be honest its hard to find JE for non NEO motors, even the JE website only lists RB26 pistons....

I know of a 3.4L RB26/30 using 87mm JEs and making 800wHP.

they are good.

Also if you're concerned with compression your builder should CC the head and do the calculations prior to even ordering the pistons or a headgasket. you can always ask them; if you're spending that kind of money there don't hesitate to ask as many questions as you need!

yeh but I dont want the stuff around. Much easier to just get the correct piston and comp. Considering it will be much cheaper too. Turns out the the machinist now got a set of ross pistons anyway.

yeh but I dont want the stuff around. Much easier to just get the correct piston and comp. Considering it will be much cheaper too. Turns out the the machinist now got a set of ross pistons anyway.

By doing what was suggested in the post above yours that's how you actually get the correct piston.

yes but i would still rather start off as close to ball park figure as possible with neo specific pistons. This isnt some nuts build, just a freshen up so the less time and money i can sink into it the better.

So I received my ross pistons today to find that they do not have the valve cut outs like the standard ones do.

Anyone have a pic of other after market pistons for neo motor?

Have I been given the wrong pistons?

Part number is 6mkry9603-0.50

Edited by camoo

so basically the compression height is different, the ross pistons are taller from the center of the gudgeon pin, so im guessing that the pistons are for a non neo rb25det.

so basically the compression height is different, the ross pistons are taller from the center of the gudgeon pin, so im guessing that the pistons are for a non neo rb25det.

The stroke on a neo or r33 rb25 are the same (71.7mm) as to the deck height of the blocks so why would the compression height be different? The combustion chamber is 10.5cc,s smaller on Neo. Below rb forged piston to suit neo head

post-64293-0-66723300-1421146166_thumb.jpg

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • There's more than one way to skin that cat, and most of the sump Maatouks have done will be GTR sumps. They are HUGE in GTR drag racing here.
    • Yeah...I always start at the shift solenoids, because there's only a few reasons these will spook into limp mode, and bad shift solenoids is one ~ the other can be the shift control module (if you have steering wheel shift buttons)...it's easier to eliminate the solenoids first.
    • Might piggy back off this thread since there's been a good discussion about PWM.   I purchased a Walbro 460 F90000267 and have been looking into PWM to understand it. It was purchased more of a future proof as my original OEM fuel pump died (r33 below 200kw) and figured I'd just upgrade it to this. That's when it hit me that a pump this big can cause more dramas with such high amperage draw and heating of the fuel pump being on 100% all the time in such a mild setup.   I have a Nexus R3 and slowly collecting power mods but I was looking into the PWM feature on the NSP software:   Then looking at the graph from the fuel pump:     Am I safe to assume reducing duty cycle to 50% for example would make the pump run like a 230/lph ? Where does the PWM come in all of this ?   I've gone down the rabbit hole of PWM fuel pumps and it seems there are many differing opinions on how to go about it 馃槄  
    • Thank you, this will keep me busy for a bit.  I will update progression.
    • That specific one would be an exchange part, meaning I'd have to send mine to them. Plus it looks like a non AWD sump, which won't work for me. There is one or two shops in my country that I can ask to do a sump extension job and it'd most likely end up being cheaper than sending mine to AUS or NZ and getting one back, and quicker too.
  • Create New...