RB20DET vs SR20DET????

[GODFATHER]

Which is better for a KA swap in a 91, 240SX. And what is the difference between the two... I found a good deal HERE (http://www.spriso.com/skyline.htm)????

[Ghettokracker71]

SR20DET is proble more worth while....I don't know if the RB has enough power to carry its weight(I could easily be wrong!)

EDIT:at least the RB20DET :whip:

[zero.counter]

First of all which SR? Then this needs to be searched before asking. There is tons of good info reagrding these two great engines...

Here, I'll give you a freebie...
# RB20DET * Twin cam
# Bore & Stroke * 78 X 69.7
# Capacity * 1998
# Power * 210ps @5600
# Compression * 25kg's @4000 8.5 to 1

# The RB20DET is the performance 2 liter engine with good allround perfromance and reliability.
# This engine responds well to modificaton and can make 400hp with the stock bottom end.
# It features in the R32 series of skylines both 4 door and 2 door & 4WDand came in manual or automatic.
# The automatic like all nissans makes about 5 hp less

Tell me which SR and I will give you more...

[darithS]

I'd pick a KA over an sr20...

[Ghettokracker71]

I'd pick a KA over an sr20...
I like the fact that I can spend the money for swapping/buying the SR to building the $(&^@( out of my KA:)

[TheTicTac]

I like the fact that I can spend the money for swapping/buying the SR to building the $(&^@( out of my KA:)

That made no sense to me, but I'll try to comprehend. You would rather buy horsepower rather than build it?

[DSC]

Sounds like for the same money one would pay to swap an sr he could build the $(&^@( out of his KA:)

I say you go with the

[dct223]

RB20 has a lil more potential cus its straight 6 turbo vs straight 4 turbo. Other than that they are pretty much comparable.. Dunno about this but since the rb is smaller displacment with 6 cylinders there might be a higher red line...

[JerkFaceJason]

I'd pick a KA over an sr20...



why?

I would feel much better souping up a race motor than souping up a truck motor.

[Ghettokracker71]

why?

I would feel much better souping up a race motor than souping up a truck motor.
....I geuss so...but the KA definitely sees good numbers when built!

This is about SR VS. RB20 anyway....lets not get OT here:)

[nightwalker]

dam retarded over argued thread. search people, search.

[Ghettokracker71]

dam retarded over argued thread. search people, search.
Search isn't the answer all do all magic button...but for the most part...yeah,a search should have been made...if it was then specifics could have been asked and people(I'm guilty) wouldn't go some damn off-topic...or flame the hell out of somebody

[nightwalker]

yes, let's all get along, and act like intelligent civilized individuals. More things get done that way.

[misnomer]

Wow, the ignorant come out to play. . .

Regardless, here's what to keep in mind:

-Are you really going to build the engine to 400 hp at the wheels? A lot of people talk this up when they consider their swaps, but don't push anywhere near it.
-What is your budget, particularly for labor? The RB is a more involved engine swap than an SR (More money for custom parts, more labor if you don't do it yourself)

And as far as the engines go, it's really personal preference. The RB should be a smoother engine due to it having six cylinders to four. Performance wise, you're roughly comparable. Newer SRs have more power than RB20s, but we're only talking a few horsepower.

The RB having six cylinders to the SR's four really has little to do with potential. They have similar displacement, which is what matters. The RB is oversquare (bore bigger than stroke), I don't have numbers on the SR, but it's closer to square. Oversquare motors will tend to be more rev-happy.

Lastly, the RB is heavier than the SR (and the KA iirc), which will effect your handling marginally. It won't kill it entirely as many people here would have you believe, but it will effect it :P

My biggest hint to get a more informative, less asstacular thread, Godfather, is to research first, and then be specific in what you ask. Nobody will tell you which motor is better, and if somebody does it is simply their opinion. The better motor depends on your use, your budget, and your preference.

And Jerkface, don't be ignorant. The fact that the KA is in the nissan pickups as well doesn't mean much. Perhaps if Nissan didn't make any changes to it for the 240 (the pickups are significanly lower reving and a bit torquier). Do you realize how many chassis GM puts their 350 into? Were you going to knock camaros and corvettes because they use truck motors? I don't mean to nitpick, just to kill missinformation :P

[Ghettokracker71]

why?

I would feel much better souping up a race motor than souping up a truck motor.
Truck engine=tough with alot of TQ

"turbos make tq...and TQ MAKES FUN" -Corkey Bell

[Ghettokracker71]

Wow, the ignorant come out to play. . .

Regardless, here's what to keep in mind:

-Are you really going to build the engine to 400 hp at the wheels? A lot of people talk this up when they consider their swaps, but don't push anywhere near it.
-What is your budget, particularly for labor? The RB is a more involved engine swap than an SR (More money for custom parts, more labor if you don't do it yourself)

And as far as the engines go, it's really personal preference. The RB should be a smoother engine due to it having six cylinders to four. Performance wise, you're roughly comparable. Newer SRs have more power than RB20s, but we're only talking a few horsepower.

The RB having six cylinders to the SR's four really has little to do with potential. They have similar displacement, which is what matters. The RB is oversquare (bore bigger than stroke), I don't have numbers on the SR, but it's closer to square. Oversquare motors will tend to be more rev-happy.

Lastly, the RB is heavier than the SR (and the KA iirc), which will effect your handling marginally. It won't kill it entirely as many people here would have you believe, but it will effect it :P

My biggest hint to get a more informative, less asstacular thread, Godfather, is to research first, and then be specific in what you ask. Nobody will tell you which motor is better, and if somebody does it is simply their opinion. The better motor depends on your use, your budget, and your preference.

And Jerkface, don't be ignorant. The fact that the KA is in the nissan pickups as well doesn't mean much. Perhaps if Nissan didn't make any changes to it for the 240 (the pickups are significanly lower reving and a bit torquier). Do you realize how many chassis GM puts their 350 into? Were you going to knock camaros and corvettes because they use truck motors? I don't mean to nitpick, just to kill missinformation :P
350 in Corvette,and camaro/firebird/transam was the LT-1...and than the LS-1...350 or 5.7 out of the truck,wich by the way isn't available anymore...is an LQ block...wich is steel 4 bolt main...the LT-1 was an aluminum(some cases) and sometimes steel 4 bolt main ...100% different...and the LS1/LS6 is an aluminum 6 bolt main block...

[Var]

why?

I would feel much better souping up a race motor than souping up a truck motor.


lmao. i always laugh when someone says this. It's a truck motor vs a race motor. . :jerkit:

get real man. if you know anything about how engines can be built you wouldnt say that. A KA with built internals will make as much if not more power than an SR with built internals. The difference is the SR is a lot easier and cheaper to put in.

[lbcklik1486]

Newer SRs have more power than RB20s, but we're only talking a few horsepower.

The RB is oversquare (bore bigger than stroke), I don't have numbers on the SR, but it's closer to square. Oversquare motors will tend to be more rev-happy.

First, the newer SR's, IE(s15) have a ton more hp than the rb's 210. Also, I might be wrong, and correct me if I am, but isn't if a motor is more squre, it'll rev higher due to it won't put as much strain on the internals? I thought that was why the s2k could rev to 9K stock... It was the compression that needed to be changed to make more revs I thought...

[s14falcon]

Ok, heres waht you need to do. Read this thread, every page of it. If you're actually considering the rb20 swap, maybe talk to nismo241 or someone who has done it to see how it is.
http://www.zilvia.net/f/showthread.php?t=23407&highlight=rb20+swap

[Uniac]

buy the rb20, boot around in it for a while then stroke it to a 2.4L. It's been said that they make over 700 hp at the wheels.

It is true the Sr will be easier, but the rb will be less common, which in my mind makes it worth the while, you won't have anyone breathing down your neck about jumping on the "sr bandwagon"

[lbcklik1486]

buy the rb20, boot around in it for a while then stroke it to a 2.4L. It's been said that they make over 700 hp at the wheels.

It is true the Sr will be easier, but the rb will be less common, which in my mind makes it worth the while, you won't have anyone breathing down your neck about jumping on the "sr bandwagon"

Who cares what anyone else thinks if you can save hundreds of dollars on availible sr parts, rather than ordering parts from japan. Less common has its downpoints also. And to say that a stroked out 2.4 liter rb24 makes 700 hp is kind of inane. You can get 700hp outta any motor :hs:

[Uniac]

You have a point bout parts and people know more bout the sr's, but, if you want to save money buy a ca18det, most parts are availible here from the pulsars.

Don't give me that crap bout them being 15 years old either.

[lbcklik1486]

You have a point bout parts and people know more bout the sr's, but, if you want to save money buy a ca18det, most parts are availible here from the pulsars.

Don't give me that crap bout them being 15 years old either.
Whoa, chill killa, ain't gotta kill nobody. Also, this debate is about an rb20 vs sr20, so although a ca might be a good alternative... it's not meeting this threads criteria.

[GODFATHER]

My main consideration on this whole thing is to get other peoples opinions on the subject. I am new to the whole building a 240 thing but I am happy I found this forum. I do belive I will stay with the SR20. From what I have found and heard it would be easier and cheaper to do this. I had no idea that the RB was a 6cyl???? That was also a question I wanted to know the difference between the two I found a good place to get engines and such with good prices. So thanks for the info and if there is any more info lemme have it.

[fliprayzin240sx]

lmao. i always laugh when someone says this. It's a truck motor vs a race motor. . :jerkit:

get real man. if you know anything about how engines can be built you wouldnt say that. A KA with built internals will make as much if not more power than an SR with built internals. The difference is the SR is a lot easier and cheaper to put in.
I gotta agree...if money was no object and i get to pick between KA and SR...id prolly go KA jes cuz of the torque and be different. Thats the reason why most guys shun the KA..have to build the internals to be reliable. If the SR and KA had the same internals *lower compression built to be turbo* the KA would make more HP at the same boost *proven fact*

Then again RB Vs SR or KA...itd be 4 vs 6 cylinder. Id go 6...but then again if i can somehow wedge a VQ45 in my S14...you know id be jumping all over that *then again thatll kill the 50-50 distro but oh wells*

[silvias13_180sx]

SR20, no question
personally, if you're in to silvias, 240s, or even sil80s and you are a big time drifter.. go for SR20 (which i hope you are...ha)
but, if you're for some reason looking for quick response or speed or stuff like that.. or.. if you're in to drag.. may be RB but.. if i were you i wouldn't even ask..i would get sr

[fliprayzin240sx]

But if money is a big issue...SR20 would be the cheapest and most reliable way to go.

[PROJECTRB240SX]

I LOVE HOW EVERYONE SAYS THE RB20 IS HARDER AND MORE EXPENSIVE THAN THE SR TO INSTALL. MY RB20DET REQUIRED ABSOLUTELY NO CUSTOM PARTS, DROPPED IN WITHOUT MODIFICATION, AND IT ONLY TOOK 5 WIRES TO START. I CAN DO A SWAP IN ABOUT 5-7 HOURS IF I HAVE EVERYTHING NEEDED AVAILABLE TO ME.

THE RB20 HAS MUCH MORE POWER THAN STATED THREE PEOPLE HAVE DYNO'D THERE ENGINES STOCK AND ARE PUTTING OUT 198WHP, HELL A KID I KNOW WITH THE AUTO PUTS OUT 180WHP 3 DEGREES OFF TIMING. THE MOTORS ARE MAKING CLOSE TO 235CHP. THE STOCK BLOCK HAS MADE 498WHP, BY A GUY ON NICO NAME WDRACING. SO THESE BLOCKS AREN'T WEAK AT ALL. IF YOU HAVE ANY QUESTIONS ABOUT THE RB20DET VISIT NICOS RB SECTION, WE ARE ALL KNOWLEDGABLE ABOUT THEM AND ARE NOT BIASED EITHER. WE'LL STATE WHAT WE KNOW AND THE HARD FACTS AND WE ALL BELIEVE AND ENGINE CHOICE SHOULD BE BASED ON YOUR GOALS BECAUSE THESE ARE ALL GREAT ENGINES. YOU CAN ALSO EMAIL ME AT [email protected] IF YOU HAVE ANY QUESTIONS.

[PROJECTRB240SX]

Ohh And My Rb20det Project Costed Me A Total Of $2800.
This Includes:
1989 Nissan 240sx Fb
1990 R32 Rb20det
Filters, Hoses, And Plugs
Fmic And Piping
Fan
Clutch
Intake

[Steeles]

I've driven both. both are fun. both are worth it. its your choice flip a damn coin so these people will shut up.

and as for the truck vs race motor. thats the stupidist thing ever typed on a forum. they are both (or in this case all three) STREET MOTORS thats it bottom line end of freakin story. learn it live it deal with it.

[twitchy]

built, supercharged KA

[Var]

built, supercharged KA


and.....................

[nightwalker]

all this and no one wants to consider a RB25 over a RB20? I believe that if you're going to do it, do it right the first time. It may cost more initially, but you have a newer motor, and much more displacement. RB25 is stupid fast in a 240.

[PROJECTRB240SX]

But The Rb20 Is Just As Good..... Can Be Built To A Comparable Displacement, Can Swap Over To A Rb25 Tranny If Need Be.