Thread: so, how balanced are SR20's?

ived owned 3 b13's, 4 sr20's, 2 decently bolted on sr20's, 2 bad ass turbo sr20's.

all of them have seen 7500 every time i drive it. my 2 n/a ones wich were daily drivers saw 7500 numerious times threw out the day.

nismonick built a sr20ve wich his brother now owns that see's 9k no problems.

dont hesitate to rev the **** out of these motors, they are extremely stout.

stratton.

The vibrations you're feeling is called power. That's why you don't feel it on the hondas.

Seriously. I've abused many sr20's all day long and twice on sundays at the rev limit most of the time and they are simply bad ass.

I'd get a ride in another sr20 or let someone test drive yours to see if what you're experiencing is normal or if your car has some sort of a problem.

LMAO

^ that was funny lol, but he said he has no doubt that the engines aren't strong. What about the ve's? are they smoother?

To be honest I think the SR20 has proven itself more an enough times to even worry about balancing. TO answer your question, though, the only thing I know of that you can do is to pull the crank and rods and balance them individually. Does anyone know what else you can do to balance an engine without redesigning the block?

There are a few common methods but they all involve more parts that need to be included in the engine design.

I think it's pretty safe to say that the honda engines have more R&D in them than a lot of other engines, including the SR20 (though I don't know that's true obviously). But they really are very well done which is probably the reason they feel smoother.. Probably the SR20DE vibrations were only considered up to the point where they were acceptable.

definetely, im going to be building a 2.2 L VE with N1's 12:1 compression, and BC VE springs and retainers, The rev limit will be set to 9100rpm, and trust me, neither my friend or me will be afraid to rev that motor out, with the proper cam timing and that higher compression the motor will still make good power all the way to that 9k redline, it will start to drop off at around 8k but not drasticly. The high compression helps. If you havent noticed yet, look at the honda motor lists and their hp. The higher the compression motor the higher the redline they use and the more power they make.

When shifts are made the power will fall right back into the sweet spot.

^
personally i wouldnt go through the trouble to balance the motor WITHOUT redesigning the block as far as aftermarket pistons, rods,ect.

almost 100% of the time you need the pistons,crank,rods, to have the rotatio assembly balanced, and you can also include the flywheel at the time to be balanced along with the rotation assembly.

to be honest i coming from a honda backround, i feel the motor has a few flaws, that make the sr20 superior over the b16 vtec motor

1: open deck block (sleeving the block is the only way to make it overly solid) sr20de doesnt have open deck block which makes it superior
2: b16 blocks have over 10:1 compression ratio (boosting the block will be limited on psi with that high of compession) sr20de compression ratio is 9:5:1 making it fully boostable

thos are only a few things that i pointed out, i am not being bias as far as saying this is only a boosted thing im talking about, both sr20de in stock trim is NA, but it has the ability to handle a good ammount of boost with proper tuning and upgraded parts without block work (b16s cannot support much over 8psi in stock trim without pulling the pistons rods, ect and rebuilding the block specificly for boost)

im just mearly saying that the b16 MIGHT have R&d in it However the sr20de can be both boosted and NA without making major configuration changes.

and i agree with you, like i said, not all applications and engines are specificly designed to rev high, high reving doesnt mean more power, its all in the specifics, like my engine was built to rev high, but the way my application setup is i dont need to rev higher than 7500rpm and my car is still making 300whp and 295wtq @10lbs

im just comparing how b16s need to ev high to make power becuase they were designed to do so, honda is all about reving, ls,b16,gsr,typer,k20 ect...its hard to compare a motor that is specificly build for high rev opposed to a motor that doesnt shine at those level of revs

yep, thats exactly, the sr20 starts to make way more power and torque alot earlier than the b16, the b16 motor isnt all that, those motors are only good in a light weight chassis such as a crx or hatch, but even then they are still not that great, back when my se-r was stock it would smoke the living crap out of any bolton si coupe out there, by far, not even close.

The sr20 outshines those motors period, the honda motors were specificly designed to rev high, ours just makes better power everywhere, boosted and its all over. torque and power is unreal.

Actually this is what I meant.. I'm not trying to say that the honda motors will be better because of better design. All I meant is that (and you basically just said this) from the factory, those honda engines are almost optimized, whereas the SR20 has plenty of room left over that nissan didn't bother with. This is one reason why the honda engines may be balanced better. But it also means happy modding for us

yes...yes...I know all those points, there's just a good sensation you get with a free revving smooth motor. I know the SR revs high, but was just curious on opinions here. Many of you guys are saying the SR is stout, but then again..why do we hear so much about rod bearing failure under 200K miles?





Now, this is what I'm curious about. How much difference did it make(if any) in the high rev refinement of the motor after the lightening, balancing, blueprinting, etc..

Guys, I know the SR is stout..but that's also relative. Like I said...Honda motors can take a big beating and keep going. Is the SR inferior to the B series in terms of durability?

just trying to stir the pot here