Thread: The JDM/USDM Roller Rocker SR20DE Info Thread

[size=0]Hey Guys/Gals,
It's your local SR20 fan Ameen here. As some of you know, recently I have had some problems with my current engine. To cut to the chase: I recently purchased a newer JDM lowport Roller Rocker SR20DE that a member (ever so kindly) picked up for me. . I actually didn't know much about the differences between a normal SR20 and the Roller Rocker version. I figured that I should do some information hunting and post for all to see. Hopefully this will help other people in the future that may decide to go this option. (As well as encourage people that the [b]Searching Before You Ask[/b] is your best friend on this forum.) [/size]

[size=0][b]Had to Live up to my word[/b][/size]

[size=0]I really hope that this all helps... As it helped me... [color=green][b]Maybe later this can be a sticky?[/b][/color] Please feel free to ADD.[/size]

[size=6]The JDM/USDM Roller Rocker SR20DE
Info Thread Starts HERE!!!![/size]

Even More Information on Following Pages...
Press Ctrl+F to search for Specific Words on a Page[/center][/size][/color]
[size=0][color=black]Disclaimer: There may be contradictions here but most of the stuff here is quoted... I am just learning and this information is here for people to learn from and discuss. This isn't posted here because I think its all right. I did not post names under the quotes because that isn't what this is about. If you see something here that you would like credit for.. Please let me know.. I will make a Bibliography/Props Section! Feel free to add or PM me to add information that is also crucial.[/color][/size]

Check out my RR Swap Process Here:
http://www.sr20forum.com/showthread.php?t=149108

First off, The Roller Rocker SR20DE Roll Call List... Add Your RR & Name!!! - 03/13/06
http://www.sr20forum.com/showthread.php?t=148945

The SR20DE(t) Compression/HeadCode List
http://www.sr20forum.com/showthread.php?t=132608&highlight=53j
Lot of good information in this thread.. Please see the codes...

Some more Head/Block Code Information
http://www.g20.net/forum/showthread.php?t=21195&highlight=2j2


My JDM Roller Rocker Engine Information:
866695A - I really feel like its from 97 or 98... not sure though...
the engine code is lower than my usdm code... The bold is what I have...

I purchased this engine for $550 from Soko/Soken Engines in Chicago, Illinois. They have different locations. They were very helpful and there is a 6-month warranty on all parts. Here is the information:

-> Soken Southgate Cali. - 323-563-2018
-> Soko Engines Chicago - 847-451-1400
-> Soken Engines (Forget Location) Cali. - 310-324-7788

I Popped my VC when I recieved the engine... I had never seen what roller rockers look like... its a pretty simple concept.




Here is what they look like after the engine was mounted




Similar Engine as Mine...
http://www.g20.net/forum/showthread.php?t=37653&highlight=primera+roller

Information on JDM engines (easily swappable for a Lowport)
http://www.sr20forum.com/showthread.php?t=68304&highlight=bolts+easiest+lowport

Where Should I buy my Used Engine??? Different Engine Importers in the U.S. - 03/05/06
http://www.sr20forum.com/showthread.php?t=147913


Why JDM engines have low milage & are cheap... - 03/05/06
http://www.g20.net/forum/showthread.php?t=9697&highlight=primera+roller

Highport, Lowport... What is THAT??? - 03/06/06
http://www.sr20forum.com/showthread.php?t=76933

I believe that there were some 94's that actually had highports early in production. Check me on that...

Some differences in Pre RR SR20's and Post RR SR20's




http://www.sr20forum.com/showthread.php?t=28607&highlight=roller+rocker
There are contradictions (on the net) ^^^ here I believe... about the RPM limits. I believe for the JDM it was a little higher than USDM, and this can be solved by incorporating better valve train constituents like springs, cams, ect... Correct me if I'm wrong.

http://www.g20.net/forum/showthread.php?t=37653&highlight=primera+roller

http://www.sr20forum.com/showthread.php?t=147144&page=4&highlight=soko


Some differences in USDM RR SR20's and JDM RR SR20's
http://www.sr20forum.com/showthread.php?t=46767



The Determinent!!!! COMPRESSION! Testimony, Facts, FSM, 10:1 or 9.5:1??? - Uddated 03/13/06

There has been testing done on a stock RR engine from a P11 Primera by a member named "jp"... his testimony is on page 3 of this thread. There is also very useful dyno information as well

There has been a long dispute on the compression for the roller rocker engine...
hopefully and eventually this rounds it up... Here it goes

http://www.sr20forum.com/archive/index.php/t-88474.html

There is a contradiction ^^^here about compression though...
http://www.sr20forum.com/showthread.php?t=147144&page=5&highlight=soko

There is also another image on the FSM for the 2002 g20motor in that thread
It reads 9.5:1... It is shown below and has been resized[/color]


Keep in mind the compression & timing difference for the G20/B15Sentra in the FSM
The b15 reads 9.8:1, and the G20 reads 9.5:1[/center]



Difference between 10:1 & 9.5:1 Pistons, its in this section...
http://www.sr20forum.com/showthread.php?t=89154&highlight=identify+10%3A1

How to indentify a 10:1 or 9.5:1 SR20DE.
http://www.sr20forum.com/showthread.php?t=32515&highlight=identify+10%3A1


Keep in mind the following:
1) That I don't think pistons really signify compression, I believe the size of the combustion chamber on the the RR engines are different from ordinary DE's. I may be wrong.
2) Even if... The difference b/n having 10:1 Compression, 9.8:1 Compression, and 9.5:1 compression for our RR motors REALLY doesn't make much of a difference. At the maxumum 5% difference in compression rate.
3) Some of the above identification schemes were done on JDM highports as well

All in all, the compression thing is only a minor thing... It can be found out if you really want to go through the trouble of doing it... i.e. taking it to a Nissan Proffesional, or Opening your motor and investigating, or Testing. I'm pretty sure that from most of the JDM motors bough from Soko, more of them were 9.5:1, but most of those were highport. That's all I know from searching though.


Highport to Lowport Information[/color]


http://sportcompactcarweb.com/tech/0311scc_roadracer/


Lowport to JDM Lowport Swap Information:[/color]
[url][b]Why JDM engines have low milage & are cheap...[/b]
[url]http://www.g20.net/forum/showthread.php?t=9697&highlight=primera+roller[/url]
[/QUOTE]
Switching out the JDM Lowport Intake Manifold... and Why?
http://www.sr20forum.com/showthread.php?t=147144&page=4&highlight=soko[/url]
Answer Below VVVVV

good info on wiring a g20 ECU
http://www.g20style.com/how_to_wire_a_95.htm

Take it out the top or bottom???
There have been lots of opinions on this...


The Actual Swap Process:[/color] Thank you for this...
http://www.roastedpavement.com/swap1.htm
http://www.sr20forum.com/showthread.php?t=140688&highlight=swap

My Swap Process!!!!! Check it out!!!!
http://www.sr20forum.com/showthread.php?t=149108

Exterior Pics of My New JDM RR Head/Block








Modding The JDM Roller Rocker![/b]

Aftermarket Pulley Information

***ATTENTION***ATTENTION***ATTENTION***[/size]
Please, Do NOT Purchase aftermarket pulleys for your USDM RR engine.

http://www.g20.net/forum/showthread.php?t=46392


There is an argument... but its not super valid... There have people that have installed them and had no problems. I do not think that its the actual pulley that is the problem, I think it's people incoherently revving "faster" and hitting higher revs then they would in the normal amount of time.

http://www.g20.net/forum/showthread.php?t=45589


CAI's
Since I am using my USDM Manifold, my Injen Intake from my 98 will bolt right up.. I will need some information on what other people do... I imagine that there is an intake that you can purchase for the 01-02 b15 if you have the USDM Roller Rocker. I will have to check into that.


Headers
Headers that are incorporated for Lowports will bolt right up but you will have to check about the Bung for the EGR tube. Since I have my USDM 98 Intake manifold, I was able to use a Hotshot Gen 3 and it bolted right up...



Props/Bibliography...[/color]
Please let me know if you would like your name mentioned here if your words have been used in this above information. I would love to give you props/credit/thanks for helping me. Names weren't disclosed to cut down on argument over contradictions.

I would like to thank: (will increase)
-TUNED200, for doing me the favor of picking up a great engine for me, and actually going out of his way to grab it... and giving me some great insight on what I should do for a swap.
-Domiken, for taking the time to give me more insight and correcting me on this type of engine & swap.
-wnwright, for taking the time to look into compression differences for me.
-jer_760, for being patient and replying to a lot of my posts...
-jp, for giving us all the useful dyno information, and testing to determine correct compression ratios!

Some of the sites information was taken from:
sr20forum.com
roastedpavement.com
g20.net
b15sentra.net
dogpile/google/yahoo

and many more... to come?

Feel Free to add Good Relevant Information...
I Shared What was Found for a Reason!!![/color][/size]
(I also apologize... I know its a little overwhelming in size)

Peace, and remember... SEARCH!

Edits & Changes...[/color]
[size=0]03/05/06 - Addition of JDM information
03/06/06 - Addition of Highport/Lowport Differences Thread
03/06/06 - Correction on Idle Speed Information
03/10/06 - Compression Information Update
03/13/06 - Addition of RR Roll Call Thread
03/13/06 - Addition to Compression Section
03/13/06 - Cleaning Up, Organization & General OCD Relief
03/25/06 - Addition of References to Dyno Info & Compression Testing/Testimony
03/29/06 - Addition of Mods Section, My Swap Link & Updating Information
04/02/06 - Added a couple of Pictures of Roller Rockers
04/28/06 - Addition of Table of Contents and Shortcuts[/size]

Thank you Domiken... Your appreciated more than you know. I have the tendency to think that you have the same OEM motor that I did...

BTW I test fit the USDM Lowport Intake Manifold and this is what I found... It fits, but the TB hits the VC like I suspected... I'm getting Thermo-Blok spacers and It would probably fit then, but would only clear a little bit and it's not worth the hassle...

So do what was said previously, and swap the Intake Manifold & your Current Valve Cover. (I had to switch anyway because I have a HS header with an EGR tube bung... Here are the pics

Check below for the contradiction...[/color]

Nope... not happening...


This statement can be contradicted if you use INTAKE MANIFOLD SPACERS... w/ the thermoblok spacers from outlaw engineering (an extra 1/4" for the plenum-head, plenum-upper plenum, upper plenum-TB) this can be done... Here are the pics of that...[/color]

Valve Cover Compatibility Information!!![/color]
http://www.sr20forum.com/showthread.php?t=147888&page=4


Here are some pics...

My RR Cover on My Regular 98 DE head... = No Go...


The Oil Squirter Bolts on both sides don't clear the Baffle Plate in the Cover... They do now allow the Cover to seat... Not sure about VE, but I think it might be the same...


Here is the Baffle I'm talking about on the RR VC...


My Old Regular DE Cover on RR Head... There you have it... It fits... My NEW DE cover is painted and ready to put on though!!! Can't wait... Swap still in progress though

Valve Cover Compatibility Information!!![/color]
http://www.sr20forum.com/showthread.php?t=147888&page=4


Here are some pics...

My RR Cover on My Regular 98 DE head... = No Go...


The Oil Squirter Bolts on both sides don't clear the Baffle Plate in the Cover... They do now allow the Cover to seat... Not sure about VE, but I think it might be the same...


Here is the Baffle I'm talking about on the RR VC...


My Old Regular DE Cover on RR Head... There you have it... It fits... My NEW DE cover is painted and ready to put on though!!! Can't wait... Swap still in progress though

aaaaa

Just to update some of the dynos... From a JDM p11 2j2 motor.

Dyno stock p11 timing at 13 (motor with more than 200.000-km)


Dyno-2 timing at 17


Dyno-3 timing at 19


Dyno-4 Timing at 20


Dyno-5 timing at 20 plus tuneup( bkr6e gaped at 1,1mm , tps at 0.45 volt ,new rotor , new air filter, MAF reground)


Dyno-6 timing at 20 Hotshot cai ,ground kit,3 inchs exhaust


Dyno-7 JWT ecu,cams s3r,ur pullies,Hotshot cai,hotshot header gen 3,apexi s-afc2 ,apexi itc(timing)2,25 inch crush bent exhaust wrx muffler.


Dyno-8 p11 stock vs p11 with cai,timing,exhaust

Some more data from a stock p11....

stock p11 timing at 12.
Some more data from a stock p11....

stock p11 timing at 12.

That dyno looks like it needs some boost lol!

Are these the same rockers as the guys in europe use as replacement rockers on SR20DET???

I've been breaking my rockers like every 2 hours and Im sick of it

Greg

Found this information in the Sentra and G20 FSM's. They have different cams too.
ROLLER ROCKER CAMS
G20 2000-2002:
INTAKE - .370" (9.4) LIFT / 232º DUR - EXHAUST - .346" (8.8) LIFT / 240º DUR - OVERLAP - 8º

Sentra 2000:
INTAKE - .339" (8.6) LIFT / 240º DUR - EXHAUST - .362" (9.2) LIFT / 232º DUR - OVERLAP - 9º

Sentra 2001:
INTAKE - .370" (9.4) LIFT / 240º DUR - EXHAUST - .346" (8.8) LIFT / 232º DUR - OVERLAP - 9º