RB25DET Compression - Nissan 240SX Forums
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#1 Old 05-22-2006, 11:00 AM
 
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RB25DET Compression

Hey guys, i know a little about compression checks, but im far from an expert and was wondering which one you would choose and why.

1- 170-170-170-170-170-170 S1 engine
2- 160-162-155-160-160-160 S2 engine
3- 161-155-155-170-160-160 S1 engine

I like 1 because it is dead even, but i don't know if that is a little high and what would make it a little high, other than that i had intentions on purchasing the s2 motor (#2), but im a l ittle scared by #2 and #3 cylinder. what is your educated opinions?

I'm going tomr to pick it up, i will let you guys know how everything went with this engine importer as i couldn't find any info regarding them on here. Thanks

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Last edited by Turbojacket; 05-22-2006 at 11:14 AM.
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#2 Old 05-22-2006, 11:10 AM
 
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Well from what i've heard the only diff between s1 and s2 is the ignition coil in the back of the engine. There are a few parts i've heard are s2 specific but the only advantage i know of is s2 will be newer. The compression i'm not too sure about but I know someone on here will know about that. I just thought i'd give my .02 on the s1 s2 thing.

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#3 Old 05-22-2006, 11:44 AM
 
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take the first one and run, with compression that even its def a good motor, iirc spec is 173-175psi new.
comp tests dont tell everything tho idealy a leakdown should be done to give a more accurate idea of the motor.

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#4 Old 05-22-2006, 11:52 AM
 
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is the difference between s2 an s1 only sensor related? or has there been any findings regarding internals such as the differences of a s1 and neo? i will be going standalone so if the differences are only electrical i will be fine with #1 the s1

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#5 Old 05-22-2006, 12:58 PM
 
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yeah the diffrences are strictly electrical.

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#6 Old 05-22-2006, 01:15 PM
 
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i thought so, thanks Carl.

edit: oops this is turbojacket logged in as roomate
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#7 Old 05-22-2006, 02:28 PM
 
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My RB20 has 155 all even across.

Where'd my S13 go?? SOLD!

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#8 Old 05-22-2006, 02:43 PM
 
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technally they are all within limits. id go with the first one though

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#9 Old 05-22-2006, 02:46 PM
 
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I'd go with the first one also, but depending on which S2 it is then it most likely won't have the oil pump drive issue. The others will. This won't be a factor though until you are seeing some big RPM or HP...

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#10 Old 05-22-2006, 06:13 PM
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Quote:
Originally Posted by Turbojacket
is the difference between s2 an s1 only sensor related? or has there been any findings regarding internals such as the differences of a s1 and neo? i will be going standalone so if the differences are only electrical i will be fine with #1 the s1
Neo's are the strongest RB25 motors, but s2's aren't neo's..


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#11 Old 05-22-2006, 10:46 PM
 
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well we decided to pick up the first one, we went down and picked it up, we were gone for about 6 hours, but when we got back we started breaking the motor down and to our huge suprise found a nismo 6-puck and lightweight flywheel! turbojacket is giddy like a school girl over it. unfortunately it doesn't have much life left, does anyone know where i can pick up a replacement disc for it? If anyone would like to know the supplier of the motor just let me know w/ a pm.

EDIT:
here are some pics of the clutch i am talking about. BTW this isn't pics of our exact clutch as we don't have the box, if anyone can direct us to where we can find a clutch disk replacement it would be awesome. also i don't think i can use just any clutch disk because if you look at the pressure plate on the inside of the clutch surface, it has these notches which like up with notches in the back of the clutch disk. you can see what im talking about in the picture of the side of the disk. anyways here they are:



This is what im talking about the grooved section, its marked in red.



Do you think a standard rb25 clutch disk can be used? that would be GREAT. Unfortunately, i don't know too much about clutches.

Last edited by klh6686; 05-22-2006 at 11:40 PM.
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#12 Old 05-22-2006, 11:27 PM
 
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Quote:
Originally Posted by DLSracing
I'd go with the first one also, but depending on which S2 it is then it most likely won't have the oil pump drive issue. The others will. This won't be a factor though until you are seeing some big RPM or HP...
lol, thats funny a rb25 revving HAHAHA!
s2 motors are susceptible to the oil drive problem, nissan didnt fix the problem till the r34 neo rb25...

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#13 Old 05-23-2006, 01:27 AM
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lol, thats funny a rb25 revving HAHAHA!
s2 motors are susceptible to the oil drive problem, nissan didnt fix the problem till the r34 neo rb25...
As funny as an RB20 making decent Horsepower!

If I found an afkmkt clutch I wouldn't be too happy. You know that engine was beaten on- and so were the bearings. You have no way of knowing the condtion of the them..


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#14 Old 05-23-2006, 04:06 PM
 
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ok upon further inspection (now that its not night) the clutch is a dual plate clutch, the first plate has grooves that lock into the second plate. I believe the clutch is a nismo gmax dual plate and but i don't know if it is worth the money to get it rebuilt, i've never dealt with a dual plate clutch before. If i can use it i would love to as i would hate to throw away something as beefy as it is. also, the stock headgasket isn't multilayer is it? if not then it came with an unmarked aftermarket headgasket. we are still in the process of examinig the motor and will figure out what we need to do with it.
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#15 Old 05-24-2006, 07:13 PM
 
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As funny as an RB20 making decent Horsepower!
hater lol

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#16 Old 05-24-2006, 09:24 PM
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that flywheel has some bad bad hot spots on it. Definately resurface it or replace it.
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#17 Old 05-24-2006, 11:59 PM
 
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lol sorry, but that isn't our exact flywheel that is just to show the clutch we have.
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#18 Old 05-25-2006, 12:57 AM
 
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Just by the looks of it, I'd say that clutch is done for. I would get the flywheel resurfaced.

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#19 Old 06-22-2006, 03:58 PM
 
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The Series II also has a slightly different turbo. The Series I compressor wheel is steel, but the Series II is composite. I did not believe it till I took it off of my car. It is definitely composite and it is very light. Not that it would make much difference as the stock turbos are too small anyways.

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#20 Old 06-22-2006, 09:10 PM
 
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When I got my RB20, it was bone stock with a meaty clutch. That made me tingle inside.

If I had found any sort of aftermarket hop up parts my face would have looked like this because that means someone was probably beating on it
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