RB25 BIG SINGLE

[DRIFTERx]

well its finally up and running i still need to touch up a few things but i think i'm definitely headed in the right direction. your thoughts? btw this whole project was built in a garage.



Modified by DRIFTERx at 9:07 PM 7/12/2007
Modified by DRIFTERx at 9:07 PM 7/12/2007

[Impulse_240]

nice bay . what turbo and manifold is that?

[Darius]

Looks real good to me. Two comments though.

1) This isn't direct towards you 100% but why do so many people hook up oil catch cans improperly or with plumbing that doesn't quite make sense?

Think of it this way. The PCV valve on the passenger side valve cover is a ball check valve. This means air can only flow one direction through the valve. In this case, that is into the intake plenum when under vacuum conditions. Otherwise under positive plenum pressures, the PCV valve is closed.

When the PCV is closed (under boost) crankcase ventilation is accomplished by vacuum from the intake side of the turbo that sucks the oil vapor out of the crankcase to be burnt for emissions purposes. So, air flow is coming out of each valve cover. The catch can is supposed to be between those two lines and A) route to the intake or B) have a breather filter on it to vent to atmosphere.

In short, placing a breather filter on the driver's side valve cover with an oil catch can tube doesn't make sense. Theoretically, half of the flow would go into the catch can and half would go out of the breather filter if the system was not under vacuum. If under vacuum, half of the flow comes from atmosphere and the other half from the valve cover.

2) Make sure you have a couple washers to space the CAS away from the cam pulley or the pulley nuts will dig into the CAS housing. Don't ask how I know. OR put the upper timing cover back on.

[300Plus]

^^^ lol I notice it all the time two. I'm simpling going to leave the two valve covers connected and have the line that originally went to the intake pipe going into the catch can, then from the catch can to the intake pipe, THUS catching the oil between the valve cover and intake. This will give me a nice vacuumed crankcase and keep the intake track clean of oil

But other then that looks good man. what turbo? how much? blah blah

[matafied]

yea what he said very nice

[Zee]

Very nice, but is an Oil Catch Can actually needed?

[Darius]

^^^ lol I notice it all the time two. I'm simpling going to leave the two valve covers connected and have the line that originally went to the intake pipe going into the catch can, then from the catch can to the intake pipe, THUS catching the oil between the valve cover and intake. This will give me a nice vacuumed crankcase and keep the intake track clean of oil

But other then that looks good man. what turbo? how much? blah blah

EXACTLY!

Zee - yes a catch can is recommended because the RB motors are known for extensive head oiling under extended high rpms. They end up blowing a lot of oil through the intake and turbo and this could ultimately end up in detonation.

[Zee]

Zee - yes a catch can is recommended because the RB motors are known for extensive head oiling under extended high rpms. They end up blowing a lot of oil through the intake and turbo and this could ultimately end up in detonation.

Thanks 4 the heads up!

[StricNyne]

thats a ultra l33t GTK turbo new from turbonetics i wanna know how it performs

[DRIFTERx]

thats a ultra l33t GTK turbo new from turbonetics i wanna know how it performs

its a gtk 550 and yes i will let everyone know how well it does.

[krayton]

EXACTLY!

Zee - yes a catch can is recommended because the RB motors are known for extensive head oiling under extended high rpms. They end up blowing a lot of oil through the intake and turbo and this could ultimately end up in detonation.

exactly u 2. but u dont really need to plumb it back into the intake. put it just to a filter on the can. going back to the intake is just for emissions stuff.

but yeah, ive given up pointing it out everytime someone does it wrong. its just too many people doing it now.

but on topic, otherwise, nice engine bay

[300Plus]

we had a long discussion about this on another thread so won't go into detail BUT it is a good idea to route back to the intake pipe (behind the filter) this way you keep the crank case under vacuum at all times. So there isn't any air trying to push up through the rings as the pistons come down... all the top dragsters vent there crankcase to the exhaust so it pulls the air out with the massive amount of exhaust they kick out

using a catch can with a filter on top of it,is just like putting a little filter on top of the valve cover. but I guess it would keep the filter cleaner...

anyways again like the turbo setup!

[Sky80]

its a gtk 550 and yes i will let everyone know how well it does.

yowsers! shooting for 500-600hp are we? def let us know how it performs, also i want to see some vids of how long that compressor wheel spins after you turn the car off... ive seen a few and they spin for litterally 30-45secs AFTER the car is off

[Darius]

we had a long discussion about this on another thread so won't go into detail BUT it is a good idea to route back to the intake pipe (behind the filter) this way you keep the crank case under vacuum at all times. So there isn't any air trying to push up through the rings as the pistons come down... all the top dragsters vent there crankcase to the exhaust so it pulls the air out with the massive amount of exhaust they kick out

using a catch can with a filter on top of it,is just like putting a little filter on top of the valve cover. but I guess it would keep the filter cleaner...

anyways again like the turbo setup!

Quit reading my mind! It's freaking me out. I'm getting especially nervous when I'm hanging out with my girlfriend; who knows what you're picking up then??

BTW What brand of coolant overflow reservoir is that? It fits perfectly!

[Coolwhip]

BTW What brand of coolant overflow reservoir is that? It fits perfectly!

Circuit Sports

[DRIFTERx]

BTW What brand of coolant overflow reservoir is that? It fits perfectly!

it is a circuit sports but i'm thinking of building another one with the catch can built in for the s13.

[Darius]

If you switched sides, you could combine it with your PS reservoir too. 3-in-1 would be really compact and clean up the engine bay.

[DRIFTERx]

darius---give me a call i've got a few questions for you

taz
Modified by DRIFTERx at 12:48 AM 7/14/2007

[Darius]

Ok but in a couple hours. I have meetings through lunch.

[blurrbosi]

Still running MAFS!!! Wow

[coreansurfer]

which mani are you runnin with that set up?

[meet07]

yeah im curious on the manifold too!!

[fly240]

what kind of exhaust manifold are you using?...

[Sky80]

update?

[TheGift]

damn good question about the breather and an amazing explanation for the reasoning behind your argument. your knowledge is very impressive

[Zee]

which mani are you runnin with that set up?

GReddy

[Darius]

I think he was asking about the exhaust manifold. And I'm curious about that too.

[coreansurfer]

yes, im curious about the exhaust manifold, and if you had clearance issues with the steering column.

[Abdo]

Looks real good to me. Two comments though.

1) This isn't direct towards you 100% but why do so many people hook up oil catch cans improperly or with plumbing that doesn't quite make sense?

Think of it this way. The PCV valve on the passenger side valve cover is a ball check valve. This means air can only flow one direction through the valve. In this case, that is into the intake plenum when under vacuum conditions. Otherwise under positive plenum pressures, the PCV valve is closed.

When the PCV is closed (under boost) crankcase ventilation is accomplished by vacuum from the intake side of the turbo that sucks the oil vapor out of the crankcase to be burnt for emissions purposes. So, air flow is coming out of each valve cover. The catch can is supposed to be between those two lines and A) route to the intake or B) have a breather filter on it to vent to atmosphere.

In short, placing a breather filter on the driver's side valve cover with an oil catch can tube doesn't make sense. Theoretically, half of the flow would go into the catch can and half would go out of the breather filter if the system was not under vacuum. If under vacuum, half of the flow comes from atmosphere and the other half from the valve cover.

2) Make sure you have a couple washers to space the CAS away from the cam pulley or the pulley nuts will dig into the CAS housing. Don't ask how I know. OR put the upper timing cover back on.

I'll keep that in mind since I will be working on it tomorrow!Thanks for the info!

--

oh and not to forget, nice build.
Modified by Abdo at 2:12 PM 9/6/2007

[s13rb28]

hey what crank pulley are you gonna be or are you running