build up of JDM F20B DOHC VTEC

[fatboy1185]

What is the max RPM on these motors you take it to? Does it come stock with its own oil catcn can/crankcase breather system?

stock redline is 8200, but i've heard of people reving it over 9k with stock internals, so i dunno exactly.. and i think the answer to your second question is no

[almostJDM]

yup stark rice revs his f20b to 8700 all the time hes got the sirt version so its a bit more stable at those revs then the sir version but both still will be able to do it

[HondaFan81]

I just wondered on the breather system on these motors at the higher RPMs, as I will be getting there on my white project.

Where do the breather port and PCV breathe to then off the valve cover? Is it like a stock H22 motor with breather port going into the intake (which the creator of this thread has/blue hose I saw in photo) and the PCV just goes into the intake manifold, PCV still functional?

[d112crzy]

Cisco, that is the same design as the F22 and H22. valve cover to IM port, then valve cover to intake.

I'm gona make him install a catchcan when I get down there.

[HondaFan81]

Cisco, that is the same design as the F22 and H22. valve cover to IM port, then valve cover to intake.

I'm gona make him install a catchcan when I get down there.

I see. I just wondered if the stock system was sufficient enough when you got an H22 engine that revs a bit higher basically. I know that B16 VTEC motors do not have sufficient crankcase breather systems stock and they can cause issues to people that rev the crap out of their motors, so this motor would fall into a similar category I would think. I would definitely improve it, doesn't hurt.

Check out my white Accord project thread in my sig. I just shot photos of my new crankcase breather can, it will be on the first post of my thread as always. All photos on are first page basically.

[d112crzy]

Yea, a high revving motor definitely needs an improvement in crankcase pressure relief.

My plan for this setup is a little different than what I've seen.

A catch can with 3 ports, all for hoses, a port for a breather filter, and a port on bottom for draining.

I will have hoses running from both outlets of the valve cover to the catch can. The 3rd line goes from catch can to IM port(or port on intake, haven't decided yet) with a pcv valve inline.

The gases from the catch can reduce octane levels. Installing a breather on the catch can will bring fresh air into the system and will also eliminate the chance of any positive pressure going into the intake.

[HondaFan81]

Yea, a high revving motor definitely needs an improvement in crankcase pressure relief.

My plan for this setup is a little different than what I've seen.

A catch can with 3 ports, all for hoses, a port for a breather filter, and a port on bottom for draining.

I will have hoses running from both outlets of the valve cover to the catch can. The 3rd line goes from catch can to IM port(or port on intake, haven't decided yet) with a pcv valve inline.

The gases from the catch can reduce octane levels. Installing a breather on the catch can will bring fresh air into the system and will also eliminate the chance of any positive pressure going into the intake.

Take a look at my setup on my project thread tonight, that's when I'll post it up (can't at work). I have nothing going into the intake piping or IM. I have no PCV either, just simplicity. I highly suggest modifying your own can, start off with an Ebay one for cheap and use that as a base. Don't pay ridiculous money as they are all basically crap and expensive for not being a complete system.

[d112crzy]

I'm gona make fabricate it myself.

[almostJDM]

that sounds like a good idea d112crzy i may do that too but with 4 ports

[HondaFan81]

Last 3 photos on this post show my catch can setup. Just FYI for you guys.

http://www.cb7tuner.com/vbb/showpost...1&postcount=18


This post explains my setup, simple:

http://www.cb7tuner.com/vbb/showpost...&postcount=368

[KeeleDesign]

good job man, this build looks great!

will you be able to have video feed for us upon your satisfication of completion?

[d112crzy]

He'll have video/photoshoot/tunage in one weekend.

[fatboy1185]

my header is being shipped on monday, so as soon as that shows up i can drive back home and get to gettin

[almostJDM]

sweet eli

[d112crzy]

A concern has come up.

He is running the stock OBD2 F20B injectors, which are 270cc saturated(high impedance).

Now, without the resistor box, they would pretty much flow about 315cc, which is still pushing it with the power he will most likely make(i dont like running above 80% duty cycle).

The problem is, he is running the resistor box as far as I'm concerned and from what the pictures show.

He is running a p28, which run saturated injectors(high imp), but he is also running the resistor box. Now, I don't even know what map he is running(he could be running a map set for saturated injectors or non saturated injectors, it makes a difference)

I wonder what effect this has on how the injectors fire.

Either way, I'm forcing Eli to get obd1 clips and buy my dsm 390cc injectors.