now im not trying to open the flood gates here.. just curoius to the thoughts of the motors the SR20 and the RB20.

ok firstly im aware that th SR is a 4cyl.. and the RB a 6cyl

----ive herad reports about how good SR's are ect..( some holding some big big power)
----also that there the best 4cyl engine going round.
----also heard report of people buting SR's into R32's after they found out that the RB20 was rooted or needed a rebuild.
----also read somewhere that a stock s14(turbo) is a little quicker than a stock 32 (gtst of course)

now im not saying that the above mentioned are facts, or my opinion.. just what ive heard.

for a street car (a goer but not a race car), why would you choose either or.. if you had the option?? what makes the 4cyl stack up against a 6cyl so well?

also curoius to see how the SR20 stacks up against the RB25 too??

cheers

jake

(aslo i tried a search on SR20's but only 'for sale' stuff came up)

opinions, pics, proof of facts please.

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hmmm well i have both a SR and a RB and im sure someone else will say it but it will depend on how much money you have. im sure if you had endless money a RB would be better in my opinion as its 6cyl not 4. but they are both dam good engines. but i dont know much so ill leave it at that.

Usually people put SR's in 32's for drifting coz the motor itself is shorter and lighter so it balances the car out more,
making it easier to drift. Or so ive read also...
as for specs, stock for stock the SR has slightly better specs then the RB but not by much.
try this http://www.skylinesaustralia.com/forums/in...p?showtopic=825
http://www.skylinesaustralia.com/forums/in...p?showtopic=661

also depends on which sr20 your talking about. Because there were differences in all the sr's from s13-s14-s15. The s15 sr20 is the gun of the bunch putting out similar stock kw figures to our rb25's.

My friend has a 1991 180sx sr20det with basically the same mods as my car (Exhaust, pod)
My car is a: R33 GTST

Both manual

His car is faster, probably dynamically a little better stock as well.

We both agree however that: My car brakes better, interior is nicer, cruises nicer and has more goodies.

Its horses for courses, you can make either car handle/go faster/brake better than the other, the important thing to remember is that they are both nissan's and that you really should drive both to make up your own mind.

ah cheers for the links. they provide a good BASIS for comparrison.

yeah well we just transplanted a RB26 into the S13 and it was as much a step back as it was forward. DO NOT believe that fitting an RB into an S13 wont make a bif differrence to handling IT DOES in a negative way. the benefit was lazy power the SR was making 280rwkw and was fairly highly strung the rb on the other hand makes 290-330rwkw (14psi - 17 psi) on std internals... If it was curcuit i would stick with SR20 all day long but for the intrest of engine longevity and cost the rb26 was chosen for drift.

RB20's are lethargic and really a waste of space in a S13 as a sr does everything better. dont get me wrong i have been in plenty of rb20's in cefiros/laurels and R32's that make me smile but hey why bother when a Rb25 or 26 bolts in and makes more power and more importanly more torque.


you cant argue with shear capacity at the end of the day if power is your thing, but for handling "built" SR all day.

ultimate for me with some spare time and spare dough is:

R32 GTST (only because of looks, and i have plenty of skyline knowledge) or maybe S13 sil or 180
slot in SR20
build motor, 2.2 litre (probably the tomei kit, quite nice engine parts)
nasty big cams in it
TD06 ex gate, either 10cm or 8cm should do it.
RB25 gear box
GTR rear cradle and hubs and diff
few other bits.
strip the beejusus out of it.

then you have a kick arse track car. tuned for around 280kw. cost under $20K and be very fast. spend $20K on a GTR and it barely makes a dent on the thing. Spend $20K on a silvia or GTST and you are flying.

^^^ i have a brian Crower kit coming over to have a play with... 2.3L.... looks like a pretty nice kit but i am a bit worried about getting the 90mm liners fitted. Any recomendations?

In terms of forum fun, ns SHITS ALL OVER SAU.

NS: For a laugh

SAU: For info

Hahaha. I love these debates. Everyone is a creature of their experiences, I have been in some nice SR20s so accept they are a good motor. But still yet to see a std SR20 make the power and response my RB20 has

What car is it for...that to me is the biggest deciding factor.

But for mine...RB20 cant be beaten. Tough, cheap and make good power out of std unopened engine. But i think it really depends on what car you are putting it in.

A vote for god power and response...



The real question is would you throw an Sr in a Skyline. No way whne you can throw an RB26 or RB30. Woudl you throw an RB into an S13/14/15...i wouldnt. Nissan got the right family of engine in the right family of chassis from the factory

So to me...SR20 and RB20 is a fair question. No point comparing the SR20 to the larger RB engines as they cant compete with the displacement deficit. Handling may be affected...handlign is very subjective in my eyes. Its nice to have a good handling car but at the end of the day its cornering speed/grip that makes a car quick or not. And i dont think an RB up front is that big a handicap.

I have got a lot of love for the RB20.

your in the wrong areas...

roy, i thought the general consensus was that the sr20 was the more responsive of the 2

certainly i hear alot about the dreaded lag of the rb20.. although im biased, but no more then you !

It's simple, SR's have rockers and RB's don't


cheers

I dont have the answer. In std form i know there is no way my std turbo RB20 could punch as quick as a friends S14 with the same filter and exhaust mods. (both std ECUs.) Maybe its in the weight and the gearing of the cars and the linear nature of how the RB20 delivers its power along with the tunes they come with std

All i know is the same friend had a cool Nizpro built SR20 S14 and it was a quick car...and my car now makes more power and has better response. And thats about it for credible comparisons from me. But looking at dyno sheets and im yet to see a std SR20 make the same spread of power. Some have cams and still dont make the same power. The RB20 does seem to need a 1-2 psi more boost with the same turbo...but im not 100% on that as the only SR20 with the same turbo setup as mine had cams and was on a different dyno.

I think the main difference is ppl with S13/14/15s actually spend money on their SR20s. If they are lucky the average RB20 owner may put an R33 turbo and a remap ecu in their cars. The RB20 owners that have thrown good turbo packages at their cars are getting good reliable power

What an expansive question you’ve posted 

I believe most of the attributes to each motor are fairly obvious and it clearly depends on preference in driving style, power delivery and use for the platform.

You ask what makes the SR a contender against a RB and I think it’s the weight and bore x stroke.
The SR is quiet lopey, and square with a 86x86 bore x stroke. This long stroke gives them the ability to pull around heavier then std host chassis’s like R32’s Ceffys and the like. The amount of air they move at low RPM’s means also, you can get away with putting some fairly large frame and wheeled turbos on them.
People assume the alloy block of the SR is significantly lighter, though in reality it needs a thicker casting to increase strength, and a crank girdle; im told the weight difference is 40kg. Its real benefit is that its weight is further back, closer to the firewall.
The torque they deliver for drifting and spooling turbos, combined with their weight distribution makes them a mighty good package.

Both 20 and 25 have a close stroke length of 69.7mm and 71.7mm, their respective capacities come from their differing bore width of 78mm and 86mm.
Naturally with less distance to cover, piston speeds are down, with the 20 having substantially less weight which is going to decrease tension loads on the rods.
This plus the fact the RB has a “real” valve train system of cam on shim means they will always take to higher / sustained revs better then the rockers of a SR.
Physically being able to spread the output power / combustion pressures over more metal and componentry it think adds to their ability to stay in a higher state of tune a lot longer then a SR.

Cleary each motor has its own niche. Due to the RB length and way it distributes its weight, putting one into a chassis like Silvia its always going to slightly upsets its handling; turn in response etc, though this might not concern many drivers.
If one has the money though, I think its hard to beat a SR in a high state of tune with GT35, massive cams, maybe a stroke increase.

Is the SR20 the best 4cyl? Not a chance. I still hold the 4G63 and 3SGTE in high regard. Iv read about dozens of near 1000hp 4G’s in the states.
Nissan made some sacrifices using the alloy block ( weight and block temperature control. Read: emissions) and rockers ( upper engine head dimensions, so as to fit into a larger variety of cars)

Treading a little out of the scope of this discussion comes the question. What if the RB had the bore & stroke of a SR? Enter the RB30 and 2JZ. Unfortunately at this type of crank load I believe the 2JZ a better engine, what with tougher crank journals and a superior stock head design, enter common streetcar combo’s like 3.4L stroker + GT47-88@40psi + 100shot for 1440hp@treads.... >> http://wotm.com/videos.html


Weight characteristics aside, I believe a RB is truly a superior motor and fits my idea of what a high performance engine is about, revs and more revs 

- M

Trust SK to distill it to the max!

I would also have thought distributing a given output load across 6 cylinders would be less stressful to the RB
than across 4 cylinders of the SR, contributing for longer term reliability of the RB.

That is unless your oil pump screws dont come out!

its easy your on sau...rbs rule lol, go to ns.com and srs rule lol......

good read and response man. cheers