RB20 vs SR....does the rb have more potential? which one is better? opinions?
RB20 vs SR
mitchell
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226 Posts
apples and oranges.
6 cylinder vs. 4 cylinder.
Please leave the comparisons to motors of the same class.
6 cylinder vs. 4 cylinder.
Please leave the comparisons to motors of the same class.
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553 Posts
You'll have more potential with an SR20 because it has more aftermarket parts. Also there are more replacement parts for the SR20 than the RB20 so it tends to be more reliable as well.
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64 Posts
sr all day long
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378 Posts
Rb Is Way More Relaible Than The Sr.
Rb Iron Block Compaired To Aluminum Sr
Short Stroke Wide Bore For The Rb, Long Stroke And Average Bore For The Sr Producing A Torqueir Power Output.
Rb Replacement Parts Are Just As Easy And Cheap As Sr Parts, Rb Series Engine Use The Same Parts Except For The Rb26 In Which The Oil Pump Has A Narrow Collar For Faster Priming.
This Whole Sr Is Better Than Rb For Handling Is Bull, The Weight Bias Moves Maybe One Point In Either Direction And On Top Of That Most Of The Weight Difference In The Rb Is Dead Center In The Car (tranny). My Cars (89 S13 With Rb20det) Handling Characteristics Are Unchanged.
Rb Iron Block Compaired To Aluminum Sr
Short Stroke Wide Bore For The Rb, Long Stroke And Average Bore For The Sr Producing A Torqueir Power Output.
Rb Replacement Parts Are Just As Easy And Cheap As Sr Parts, Rb Series Engine Use The Same Parts Except For The Rb26 In Which The Oil Pump Has A Narrow Collar For Faster Priming.
This Whole Sr Is Better Than Rb For Handling Is Bull, The Weight Bias Moves Maybe One Point In Either Direction And On Top Of That Most Of The Weight Difference In The Rb Is Dead Center In The Car (tranny). My Cars (89 S13 With Rb20det) Handling Characteristics Are Unchanged.
for anything other than drifting I would say RB as far as engine potential goes, but if you're not going to push it past 450 or so horsepower, why get the added weight of the RB? The SR swap is somewhat easier and is probably the way to go unless you're seeking very high horsepower (SR's have been built to well over 500hp on stock bottom ends) just my two-cents
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378 Posts
Yes It Is.
All Rbs Are I6
20 = 2l
25 = 2.5l
26 = 2.6l
30 = 3l
All Rbs Are I6
20 = 2l
25 = 2.5l
26 = 2.6l
30 = 3l
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227 Posts
Yeah the R32 Skylines came with RB20'sAWD90DSM said:
It all depends on how much money you want to spend and really. The SR is usually a little cheaper to install and a little easier for someone trying to do this yourself. The RB on the other hand is a little harder, but hardly anyone has them so if you want to be unique. As for handling I can not tell the difference between when I had my KA and now with the RB in. Also you have to ask yourself how much HP you really want to make instead of what you wish to make. if you want 300HP go with the RB you can obtain 300HP a little cheaper than with the SR usually. If you want more than that I say go with a SR it is usually easier for mechanics to work on and high HP parts are easier to find. This debate can go on forever thought so this is just my 2cents....Stubby
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378 Posts
THIS IS ALL COMPLETELY FALSE.DLSracing said:
I HAVE PURCHASED MY CAR, RB20DET CLIP, EVERYTHING NEEDED,AND INSTALLED IT MYSELF FOR UNDER $3800. THE POWER OUTPUT OF THE RB IS EASIER TO OBTAIN THAN THE SR BUT BECAUSE ITS A 6CYL ITS MORE EXPENSIVE. PARTS ARE JUST AS EASY TO FIND FOR THIS ENGINE AS IT IS FOR THE SR. HANDLING IS NO DIFFERENT THAN STOCK, ACTUALLY WITH THE SR THE CAR BECAUSE EXTREMELY LIGHT IN THE FRONT.
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822 Posts
Like people are saying, It really matters what you want. If you just want it for drifting or auto-cross, then go with the SR. For Drag well it's really hard to say. Both the SR and RB20 have been taken up to around 530HP on stock internals, so that is not to argue with. The RB20 is going to be a little heavier, but the power can make up for that. The only thing that I don't like about the RB20 is that it is a 2.0l on it's I6, which to me seems a little low for a six cylinder. No need to worry though, the BR family can share almost any part needed. Find some used RB25 or RB26 internals (crank, rods, and pistons) and you make it a 2.5-2.6l with a very short amount of money. There are so many things to factor in when deciding between the two.
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378 Posts
False Again....
The Rb20 Can Accept Only The Crank And Rods, The Pistons Need To Be Custom Made.
Rb20 Bore = 78mm
Rb25/26 Bore = 85mm
The Other Internals Are The Same Instal Pattern But Different Flow Rates Excluding The Rb26 Oil Pump Which Has A Wider Collar.
The Highest Displacment For A Rb20 Is 2.5l Using The Rb26dett 2.7l Storker Kit And Custom 82mm Pistons.
The Rb20 Can Accept Only The Crank And Rods, The Pistons Need To Be Custom Made.
Rb20 Bore = 78mm
Rb25/26 Bore = 85mm
The Other Internals Are The Same Instal Pattern But Different Flow Rates Excluding The Rb26 Oil Pump Which Has A Wider Collar.
The Highest Displacment For A Rb20 Is 2.5l Using The Rb26dett 2.7l Storker Kit And Custom 82mm Pistons.
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3,274 Posts
would you walk into a dealer and ask for the heaviest, and oldest 2.0 motor on the lot? no.
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