Ka, Sr, Rb??

[chefer88]

hey guys im trying to learn more about the classifications of engines. And I wanted to get started with whats the difference between the KA, SR, and RB and r these engines only made by nissan cuz i know that the supra has something like a 2JTC something. Thanks

[fnlheaven413]

All three are Nissan Motors.
KA24 engines go into our american 240sx (s13-15)

The SR engines go into the JDM (japanese domestic market) sivlias 13-15 and the 180sx (which is a silvia fastback, they are the same car) the SR series has a red top and black top and a notch top, which corresponds to which car it went into.

There are SR series engines in american Nissan's but they are more liek distant relatives to the series more than sister engines, they are found in pathfinders and sentras.

The RB series goes into Skylines, cefiros, and commodores, i think which are basically just these weird lux sedans that nissan had put out in japan at one point. If you didnt know there ar eno skylines in america unless it was imported. There is even a special RB engine just for aussie skylines.

Here the Nissan motor matrix which id assume just came from nissan motors but im not sure where i got it.

Crap it didnt come out formatted as it was in my .doc file, well w/e its all there just not nicely lined up.

If you hadnt guessed Nissan has a very simple motor code.

For intance SR20DET
SR series engine
2.0 Liter engine
D-ual overhead cam
Electronically controlled
Turbo

RB25DETT
RB series
2.5 Liter engine
Dual overhead cam
electronically controlled
twin turbo

VG30DET
Vg series engine (this is a V-6 engine im not sure if thats what the V stood for)
3.0 Liter displacement
Electronic yadda yadda
turbo


Nissan Motor Matrix

Motor Code Displacement Power Torque Compression Bore Stroke Ignition Cam Production Special Features
SR20DET(Red Top S13) 1998 205 203 8.5:1 86 86 Direct DOHC 1991-93 180SX & 1991-93 Silvia (JDM)
SR20DET (Black Top S13) 1998 205 203 8.5:1 86 86 Direct DOHC 1994-98 180SX (JDM)
SR20DET (Notch Top S14) 1998 220 203 8.5:1 86 86 Direct DOHC 1995-98 Silvia (JDM) Variable Valve Timing
SR20DET (Notch Top S15) 1998 250 202 8.5:1 86 86 Direct DOHC 1999+ Silvia (JDM) Variable Valve Timing, 6-speed manual transmission
SR20DE 1998 140 132 86 86 Distributor DOHC Sentra SE-R, 200SX SE-R, Infiniti G20
SR20VET 1998 278 86 86 Distributor DOHC 2001 X-Trail GT First turbo variable valve lift and timing motor
RB26DETT 2568 280 293 8.5:1 86 73.7 Direct DOHC 1999+ R34 Skyline GTR Twin turbo, 6-speed manual
KA24E 2389 140 152 9.1:1 89 96 Distributor SOHC 1989 to Early 1990 240SX
Ka24DE 2389 8.6:1 89 96 Distributor SOHC Late 1990 240SX Only the 8.6:1 cr motors had an IAT sensor
Ka24DE 2389 155 160 9.5:1 89 96 Distributor DOHC 1991-98 240SX
Ka24E 2389 140 152 9.1:1 89 96 Distributor Hardbody Pickup 3 valves per cylinder
CA18DE 1809 135 117 9.5:1 83 83.6 Direct DOHC 1988-93 180sx
CA18DET 1809 175 166 8.5:1 83 83.6 Direct DOHC 1988-93 180sx Standard Viscous LSD
RB20DET 1998 214 185 8.5:1 78 69.7 Direct DOHC R31 Skyline, 1989-94 R32 Skyline GTS-T >S4 Inline six cylinder
RB25DET 2498 250 212 9.0:1 86 71.7 Direct DOHC R33 &R34 Skyline Ceramic turbo
RB20DE 1998 130 124 9.5:1 78 69.7 Direct SOHC R33 &R34 Skyline
RB20DE 1998 165 135 10.2:1 78 69.7 Direct DOHC R32 Skyline GTS
RB25DE 2498 190 167 10.0:1 86 71.7 Direct DOHC R32, R33, R34 Skyline and R33, R34 Skyline GTS4
RB30ET 2962 200 191 8.5:1 86 85 Direct SOHC 1986-88 Holden Commodore
RB30E 2962 160 124 9.5:1 86 85 Direct SOHC 1986-88 Holden Commodore, Australian R31 Skyline
RB30DE 2998 250 216 9.5:1 86 86.7 Direct DOHC Race only, never a production motor N/A hybrid race engine
VG20ET 1998 170 159 8.0:1 78 69.7 Direct SOHC 1983-84 Gloria V20
VG30ET 2960 231 246 7.8:1 87 83 Direct SOHC 1983+ 300ZX turbo
VG30E 2960 180 191 8.0:1 87 83 Direct SOHC 1983-84 Gloria V30E
VG30DETT 2998 279 286 8.5:1 87 83 Direct DOHC 1989+ 300ZX twin turbo Twin turbo/Twin intercoolers
VQ35DE 3498 250 240 10.3:1 95.5 81.4 Direct DOHC 2003+ 350Z
VQ30DE 2987 220 205 10.5:1 93 73.3 Direct DOHC 1996-97 Cedric & Gloria
VG30DET 2987 270 270 8.5:1 87 83 Direct DOHC 1996-97 Cima 30LV & 30TR



Lol this is sadly the onyl time my knowledge of nissan motors has ever come in handy. Hope that helps more than it confuses.

[nismoron]

Originally Posted by fnlheaven413

RB25DETT
RB series
2.5 Liter engine
Dual overhead cam
electronically controlled
twin turbo

There is no RB25DETT
THe RB motors of any interst are as follows
RB20DET = 2 liter single turbo ( I have one of these in my car)
RB25DET = 2.5 liter single turbo
RB26DETT = 2.6 liter twin turbo (from Skyline GT-R's and Stagea RS260)
RB30Et = 3liter single turbo single cam. Often converted to twin cam with an RB26 head installed ... can make HUGE hp #'s with stock internals.

I assume you are talking about putting one in a 240sx...

The RB20 can be installed and modded a good bit for the price on just buying the SR uninstalled. The RB is faster in stock form and costs half as much. Oh, and is easier to wire to the 240.

The SR is a waste of money in my opinion, because for the $2500 to $3000 it costs to buy one (with 215hp) you can buid a KA24DE with forged rods and pistons. Install larger injectors and an SAFC, Emanage, or ECU tune and bolt on a T3/T4 and make 450-500hp AT THE WHEELS!!!

To get an SR to that power would take another $3000-$5000 in addition to the $3000 you paid for it, to get those #'s

[chefer88]

So are the KA better (I mean more HP and cheaper) than the SR. And also where can you get an RB engine n how much is it. Also which one can you get more power for and also cheaper

[nismoron]

Originally Posted by chefer88

So are the KA better (I mean more HP and cheaper) than the SR. And also where can you get an RB engine n how much is it. Also which one can you get more power for and also cheaper

You can build a KA with forged rods and pistons with a nice t3/t4 and larger injectors and an Emanage for the price of just buying (not shipped, not installed) an SR20DET. At that point you could have about 300hp at the wheels. If you went without the Emanage and had a standalone fuel management system and larger injectors, you can get400-450 hp at the wheels. All for about the same cost as a lightly modded SR that might have 250-300 hp.

An Rb20 will cost you about $1200 + shipping from www.venus-auto.com

A KA can do 500ish hp
An Sr about the same maybe slightly more but for 10's of thousands of $

The RB depends on which one you want.
RB20 is good for about 450hp
RB25 is good for about 650hp
RB26 is good for 1200+ hp
RB30 is good for 1400hp

[TougeMonster]

toyota's 1JZGTTE you mean....that would be the only logical idea a nissan driver would swap into a 240sx....lol (i drive toyota)

[chefer88]

im not trying to b mean or nething b/c i know that u (nismoron) know a **** load more than i do bout cars b/c ive reading almost any reply that you write to anybody, and i wish i could meet you in person b/c u r the kinda guy that doesnt just throw a bunch of money in a car for no reason, u actually think on what would be the best, and the best part about it you dont pay any mechanics, so you know what it is to be in the ground for hours to just loosen some screws. but why would u get a rb20det if it can make the same as a ka24de and the parts of the ka r cheaper

[Still_Good]

Alot of Nissan owners like to look past the Ka24... I don't think anyone really knows why, some people are just dumb like that. I guess its just not JDM enough.

Thats, said, people import motors for the 240sx, and they use the SR20det obviously. For those, who want a more drag biased approach, then the RB was the next logical choice, being a heigher displacement/power capacity imported motor.

I don't want to be an ass or anything, but i really find assigning "Horsepower" abilities to a motor to be inneffective. There are people pulling 1000hp out of mitsu's 2L 4g63, but that doesn't mean its a comfortable, streetable 1000hp.

You can probably make about 500hp on the KA and still have fun driving it around town. To make much north of that, you're going to be using a god awful massive GT series BB turbo in all likelyhood, spin the motor to 10k and not make boost until 6k.

With an RB25Det will probably make 600 or 700 horsepower before you have to have the really super-nasty cams, and stupid laggy turbo. Also note that putting a higher displacement motor like the RB up front will throw off your weight balance and if not ruin, laregely disturb your car's handling dynamics.

One man's racecar is another's street car, and its all about what you like. The RB will make the most horsepower comfortably, but at the cost of weight distribution.

Before anyone gets up in my face, Its all about trade offs, and I'm just trying to say that theres alot more to it than horepower numbers.

[nismoron]

Originally Posted by Still_Good

One man's racecar is another's street car, and its all about what you like. The RB will make the most horsepower comfortably, but at the cost of weight distribution.

Before anyone gets up in my face, Its all about trade offs, and I'm just trying to say that theres alot more to it than horepower numbers.

You are absolutely correct about the engines and their capabilities. The hp figures I was listing were just a rough idea of what is practical from those motors.

The weight problem you suggest isn't as bad as you suggesst if you mount it right. I have the RB 20det in my car. They are the same weight as the RB25det (RB25 tranny is a little heavier, but that is behind the front wheels). Many people try to use the Skyline crossmember to mount the RB engines and it mounts them too high and forward. They DO ruin the balance of the car. I used custom motor mounts to lower the engine and move it back about 2 inches. The balance is little different than stock and only weighs 70lb more total.

Why did I go with the RB... Because back when I put it in (2 years ago) there wasn't as much info or parts for the KA. And the RB was there...So I wanted one. I wanted something different than alll these people screaming SR SR SR oooooohh SR! They dont even know why the want one

Also I like to drive the crap out of an engine ALL the time. With the RB you have to. All the power is up top, like a 2 stroke dirt bike. All of the real power is between 6000-8000rpm. The KA is a mid to fairly high rpm (3000-6000rpm) torque monster... Torque is what wins drag races

[chefer88]

when you say u can get out 400 to 500 hp how much r u talking to put in each engine Ka and Rb

[nismoron]

Originally Posted by chefer88

when you say u can get out 400 to 500 hp how much r u talking to put in each engine Ka and Rb

For the KA from $3500 to $5000 for 400-500 hp.

For the RB it depends on which RB... You keep saying RB like ther's only one type of RB...

[chefer88]

i meant the rb20det which is the only one that u said that was gona make 400-500hp (max kinda)

[nismoron]

Originally Posted by chefer88

i meant the rb20det which is the only one that u said that was gona make 400-500hp (max kinda)

Makking 400-500hp in a RB20 is going to take some bucks$5000+ And be at the top end of what the motor can do. What are you planning to do with 400-500hp in a 240? It will be all but undriveable!!! And not streetable!

To get those #'s out of an RB you will need a 25 or 26. Both of which are a difficult fit in 89-94 S13. They go a little easier in a 95-98 model S14 because the transmission is so large. You have to hammer the tranny tunnel in the car a little larger.

You can get 400-500 fairly easily in the rB25, and would suggest that route.

[chefer88]

I've heard that its easier to get 200 hp out of a ka by adding a turbo than buying an rb20det because its a lot cheaper. But I was wondering what kinda turbo would go in the ka n is it hard to install

[Haakon]

One other thing,is it easy to get performance parts for the rb engines in USA