See Are X

Would 4 vents on a b-series valve cover be sufficient, running no more than 14psi? I really don't want to have to vent the back of the block(lazy), but I was thinking maybe the extra vents up top would help. I was thinking, 2 in the front and 2 in the back.

Dunc

I would think 4 is getting into the realm of overkill. 2 in the front would be sufficient.

vtec.dc2

at 270whp in your sig 2 holes plus factory hole should be enough.. i have no idea how much hp you're making at 14 psi.. is it 240? 300? 400?

back of valve cover isn't baffled. you could match the diameter of 4 holes combined by making 2 holes larger.

heres one way to look at it, if you don't see smoke out the valve cover at all.. then whatever vents you have is doing the job

turbo boost

iTrader: (1)

would a factory catch can on the back of the block be enough..with a filter on the valve cover be enough?

vtec.dc2

filter on valve cover would be a restriction. factory vents are enough for factory hp.

turbo boost

iTrader: (1)

so is it best tost leave the valve cover nipple bare?

Mugencrxsir1

First of all, the factory ventilation system is'nt even great for the stock motor, and I would rather have a filter over the stock vent than nothing, you don't want anything in there.... So at a bare minimum, you should have atleast one additional vent added to the valve cover, and maybe two if you plan on uping the HP down the road. If you think the stock ventilation system is fine for your stock engine, just take a look at the top of the stock pistons and all the **** that collects.......

turbo boost

iTrader: (1)

ok..can i run all my lines to 1 catch can?..1 off the factory valve cover nipple and the 2 from the back of the block?? would this be fine with 300whp?

See Are X

Im shooting for ~300whp. I guess my main question here is, with ~300whp, do I REALLY need to vent the back of the block if I use the stock vent near the oil cap and add 2 more vents in the front of the valve cover?

Cyphear

I'm making well over 300whp with only the stock vent on the valve cover with a catch can. I'm not sure how much crankcase pressure there is at WOT, but it seems to be working fine.

Cyphear

So how important is crankcase ventalation? Does anyone have any dyno #'s or anything showing that the stock valve cover vent + stock evap line on back of the block isn't sufficent?

BodyKits NW

Why do people weld the bungs on? Can't you just tap a fitting and call it a day.

mike1114

iTrader: (1)

This is coming from someone who knows catch cans...when you read the threads, I have input all over the place.

Just use the valvecover with 4 vents and call it a day. No you do not need to use the back of the block. You can just tap fittings, but I prefer welding bungs personally. The valvecover not being baffled on the back makes no difference. use largest diamter lines you can.

To the guy with just the valvecover nipple ventilation....that is seriously not enough ventilation and your are stressing your rings and gaskets.....

93supercoupe

THUNDER CATS WHOAAAAAAAAAAAAAAAA!!!!!!!!!!!!!!!

See Are X

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike1114 &raquo;</TD></TR><TR><TD CLASS="quote">You can just tap fittings, but I prefer welding bungs personally. The valvecover not being baffled on the back makes no difference. use largest diamter lines you can.
</TD></TR></TABLE>

Should I use any "special" type of fitting if I just tap it into my valve cover? or will anything from like home depot work? Also, where can I get a good size breather filter? and some hose?

ITS_Dunn

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by See Are X &raquo;</TD></TR><TR><TD CLASS="quote">

Should I use any "special" type of fitting if I just tap it into my valve cover? or will anything from like home depot work? Also, where can I get a good size breather filter? and some hose?</TD></TR></TABLE>

use a fitting you can screw onto, and have welded into your VC

vtec.dc2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by See Are X &raquo;</TD></TR><TR><TD CLASS="quote">

Should I use any "special" type of fitting if I just tap it into my valve cover? or will anything from like home depot work? Also, where can I get a good size breather filter? and some hose?</TD></TR></TABLE>

it doesn't cost arm/leg to have it welded. your valve cover is aluminum so use aluminum fittings.. valve cover is thin and you need npt thread maker as most fittings are going to be like that. i suppose you can get it to work with just tapping and then jb weld around the corners.. breather filters will eventually clog and cause damage. you can get hoses from most plumbing supply store.

AIRIC

dont people use the back of the block to drain back into

ITS_Dunn

front of vc is just as good and I think easier

See Are X

I dont wanna weld cause I dont wanna mess up my mint valve cover lol...

Cyphear

do you have to use a tig to weld an aluminum fitting to an aluminum valve cover, or will a mig do it? Any suggestions on fitting size? 1/2"? 5/8"?

See Are X

so...any suggestions on where to get fittings for non-welding?

Cyphear

here are a few good related threads:
https://honda-tech.com/zerothread?id=1781677

https://honda-tech.com/zerothread?id=1854223

I'm undecided whether or not to do the freeze plug trick or the valve cover vents. Any recommendations?

Also, what do you do with the stock ventalation lines (on the VC and coming from the back of the block)? Seal 'em off?

ITS_Dunn

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Cyphear &raquo;</TD></TR><TR><TD CLASS="quote">
I'm undecided whether or not to do the freeze plug trick or the valve cover vents. Any recommendations?

Also, what do you do with the stock ventalation lines (on the VC and coming from the back of the block)? Seal 'em off?</TD></TR></TABLE>

Run two VC ones and use the plug from Honda for the rear of the block to drain back into if you wish.

If you dont, just pull out the breather and seal the bitch..

https://honda-tech.com/zerothread?id=1199935