INSIDE OF K20- cam gear,cam shaft,retainers,valves/springs,rocker arm (Merged)

[Corpsman]

Any chance for a Balance Shaft Removal kit? I know in my old 03 Nissan Spec V, the BSR freed up about 10 HP. Then again, that balance shaft was in the oil pan and ours seems to be in the middle of the engine.

[skittleslegend]

Originally Posted by Corpsman

Any chance for a Balance Shaft Removal kit? I know in my old 03 Nissan Spec V, the BSR freed up about 10 HP. Then again, that balance shaft was in the oil pan and ours seems to be in the middle of the engine.

It's in the oil pan. We've had this discussion before. The Si only loses 4hp to the balance shaft.

[BATANG CITY JAIL]

just wanted to share.

[dentrecords]

Merged :)

[Storm]

Originally Posted by scrumtralescent

That's very interesting info, I would be interested in swapping the RBC manifold for the RBB manifold for a little more torque seeing as how I like accelerating more than driving at high speeds.

Has anyone actually done this yet?

[skittleslegend]

Originally Posted by Storm

Has anyone actually done this yet?

Not that I know of, but theoretically, the way the engine is setup for emissions, the RBC intake manifold is a big source of unrestricted flow and is currently Honda's best intake manifold. It hasn't been tested on the K20Z3, specifically, but on other Honda engines, the RBC has tested consistently higher flow than the RBB manifold (I have the numbers somewhere), while keeping torque loss differences to a minimum. There have been a few cases where the RBB manifold was the better choice of the two, but of what I've seen, those cases were high-output K-series motors, not likely the kind of output to be seen by most members here. I'm talking a coupe hundred horses.


And that's really cute how somebody changed the title of this thread, but can we change it back please? This information is about the K20Z3. Not the K20. The K20 is a very broad designation. I didn't put all of this shit together for nothing. Thanks a bunch.

[Storm]

Would the TSX IM phsically fit in the civic engine bay?




Assuming that it would fit, what throttle body would need to be used?

[skittleslegend]

Um...ok. I don't think you really caught what I was saying. You're looking at a fairly significant loss in top-end power swapping those intake manifolds. The K20Z3 was designed specifically for the RBC manifold. The torque gain you're looking at is neglible. It's a high-revving 2.0L Honda block...you're not going to see any significant change in torque output anyway. People dump the TSX manifold for the RBC during K-swaps.

But I suppose if you're really set on using the TSX IM, then go for it. It'll fit. You should still be able to use the Si's throttle body, but from what John at Hytech has said, the TSX TB will swap over too.

[2RotorMotor]

RBC manifold FTW..

[Storm]

Originally Posted by skittleslegend

Um...ok. I don't think you really caught what I was saying. You're looking at a fairly significant loss in top-end power swapping those intake manifolds. The K20Z3 was designed specifically for the RBC manifold. The torque gain you're looking at is neglible. It's a high-revving 2.0L Honda block...you're not going to see any significant change in torque output anyway. People dump the TSX manifold for the RBC during K-swaps.

But I suppose if you're really set on using the TSX IM, then go for it. It'll fit. You should still be able to use the Si's throttle body, but from what John at Hytech has said, the TSX TB will swap over too.

I understand clearly what you are saying:)

I am merely curious to know if the IM would fit. I am not set on doing any type of swap, but would like to see what a dyno would show for an si with the RBB IM versus an si with the stock RBC.

[Dessa_8837]

What makes up your Si?

"The head is 100% TSX
the block is a tsx 2.0L version with dual oil balance shafts and oil jets with a type s oil pan.
oil jets, and the little oil pump cover signifies the dual shafts..
The oil pan is not from the K20a2 though. It uses a different casting so that the rear motor mount can attach to it. The type s style single pump has a longer cover. Stock k20a2 clutch. As far as the cams, they have different part numbers so we are not going to know till we test them

'06 Si Cams
Intake 14110-RRB-A00
Exhaust 14120-PRB-A01

'05 Type S Cams
Intake 14110-PRC-030
Exhaust 14120-PRC-030"

All of this is actually pretty surprising since the engine designation is K20z3 and the 06 RSX-S engine designation is K20z1. Although the Si shares some similarities, it seems to actually be closer to that of a TSX, including the Drive-By-Wire throttle. Another example, is the transmission. The Si tranny uses 1st-5th gears from the RSX, but the 6th gear is from a TSX. The LSD is from a JDM DC5R. The syncros on gears 4-5 are carbon, not brass like the 02-04 RSXs. This should reduce the problems that tranny had with gear grinding.

The Si uses the RBC Intake Manifold from the JDM Accord Euro R. The TSX uses an RBB Intake Manifold. The difference between the two is the RBC uses shorter fatter runners optimized for high rpm breathing and the RBB uses a long narrow runner which is good for torque. This is part of the reason the Si loves to rev, because it was given the intake manifold do so. It's trade-off is torque. We all know the Si's torque is low compared to it's competitors. Theoretically, you could swap the RBB Manifold onto the Si and pick up better torque, at the slight sacrifice of top-end. How much sacrifice and how much gain is unclear. The RBB Manifold is also used on the 2.4L 160hp Accord.

The Si uses raised dome pistons.The balance shaft smooths out the engine, reducing vibration, which is why there's a difference in horsepower rating between the RSX-S and the Si. These are the reason for the 4 horsepower difference after the new SAE ratings.Notice the MAF sensor on top of the Air Filter. For those that don't know the MAF (Mass Airflow) sensor converts the amount of air drawn into the engine into a voltage signal. The ECM needs intake volume to calculate engine load. This is necessary to determine how much fuel to inject and when to ignite the cylinder.Honda advertises the Si as having a cold air intake. The snorkel runs under the battery tray to another box and from that box another snorkel runs to the fender. With it's length and all the bends it probably does drawn in cooler air but at the expense of throttle response.

I bolded a couple things so the differances would be easy to spot out.

ShayneD.

[Raging]

Good job finding this and sharing it here!!


Edit: +1 Rep!!

[SIcBoy]

good write up

[Dessa_8837]

Yes it is!

ShayneD.

[Chase86]

Seems Honda and Porsche share the same philosophy. Take all the best parts from previous cars and put them into their premiere car. Porsche takes all the best parts from previous 911's and puts them into the latest 911 turbo. Check out the Best Motoring video on the 996 911 turbo it shows actual part #'s and castings and such.

[Skylinegtr06]

Can someone merge this with the thread skittles made?

[MBK]

lol good work Dessa. i think this thread should stand alone

[Gonzo]

Originally Posted by Dessa_8837

The Si uses raised dome pistons.

So...

That thing got a hemi in it?

[BubzSI]

WOW THIS DESERVES REP..

[webby]

thread merged, cleaned up, and stuck in the civic si forum.