Holden 253 V8 question

[Ext User(lx_350@hotmail.com)]

Hi all,
I have a 253 in a torana, only mildy modified. .made about 170hp at the
tyres so it goes OK.
Just a quick question. .I run a PCV valve in drivers side rocker cover,
and the passenger side has a breather/oil fill cap. Someone was looking
at the engine the other day and commented that it should have a sealed
cap, not an open breather type cap, to aid vacuum.

Anyone have any ideas?

Cheers,
NitroLX

[Ext User(lx_350@hotmail.com)]

Oh, PCV valve hose runs into the aircleaner housing, by the way.

Cheers!

[Ext User(moon)]

<lx_350@hotmail.com> wrote in message
news:1129709750.819531.194690@o13g2000cwo.googlegr oups.com...
> Oh, PCV valve hose runs into the aircleaner housing, by the way.

PCV valve should run to manifold vac.,
other side needs filtered air whether it be from air cleaner or breather
cap. (air cleaner filters better)

[Ext User(mackeb@cen.prendiville.wa.edu.au)]

Hi,

I run the same system on my mild blue 253 in my VH commodore.
NOthing wroung with the vacuum, can run a QJet and Gas Mixer wihtout
any trouble what so ever.

Manifold vacuum depends on a numbre of factors including number of
venturis, throttle position etc.

The PCV is very important - moreover it doesn't matter whether or not
you have a breather cap but you *MUST* make sure your PCV is working.

I had a length of soft rubber hose from my vale to carb and after the
engine warmed up, the heat on the bay made the hose collapse. It
susbequently caused oil to leak out of my front main seal after a
moderate drive. As soon as I put brake hose on, the oil leak stopped!

[Ext User(mackeb@cen.prendiville.wa.edu.au)]

PS Don't let anyone tell you that the 253 is a crap motor. Mine puts
out waaay more torque that a stock 308 and I have spend about $1000 on
the engine so far (to keep it driveable)

[Ext User(Clockmeister)]

<mackeb@cen.prendiville.wa.edu.au> wrote in message
news:1129727481.955598.240730@o13g2000cwo.googlegr oups.com...
> PS Don't let anyone tell you that the 253 is a crap motor. Mine puts
> out waaay more torque that a stock 308 and I have spend about $1000 on
> the engine so far (to keep it driveable)
>


It's a boat anchor.

[Ext User(athol)]

lx_350@hotmail.com wrote:
> Oh, PCV valve hose runs into the aircleaner housing, by the way.

Very wrong.

If it's an LX, there are 3 possible emission requirements:

1. 7/76-on, ADR 27A.
2. NSW registered pre-ADR 27A but '75-on.
3. Pre-ADR 27A but not NSW (also applies to pre-'75 NSW).

If it is either (1) or (2), it is legally required that the PCV system be
"closed" as part of the evaporative emission rules. This means that the
PCV valve _must_ be connected to manifold vacuum (it is a valve that is
designed to maintain a constant rate of gas flow regardless of manifold
vacuum by opening wide at low vacuum and mostly closing at high vacuum).
The oil cap either _must_ be a sealed type and there must also be a
separate hose fitting in that tappet cover or the cap must have an
integrated breather hose fitting (as per Ford) and the breather _must_
go into the air cleaner housing.

In case (3), the PCV _must_ be connected to manifold vacuum but the
crankcase breather can be open to atmosphere (vented cap).

--
Athol
<http://cust.idl.com.au/athol> Linux Registered User # 254000
The state of infrastructure in New South Wales is a disgrace.
I'm a Libran Engineer. I don't argue, I discuss.

[Ext User(Dan---)]

On Thu, 20 Oct 2005 05:37:51 +0800, Clockmeister wrote:


>
>
> It's a boat anchor.

Now now thats not nice if the owner does not own a boat.

1st time post via Linux I hope it isn't in HTML. :-)


--
Regards
Dan

[Ext User(Saus29)]

not with NOS!

"Clockmeister" <no-one@nowhere.com> wrote in message
news:4356bcb0$1@duster.adelaide.on.net...
>
> <mackeb@cen.prendiville.wa.edu.au> wrote in message
> news:1129727481.955598.240730@o13g2000cwo.googlegr oups.com...
>> PS Don't let anyone tell you that the 253 is a crap motor. Mine puts
>> out waaay more torque that a stock 308 and I have spend about $1000 on
>> the engine so far (to keep it driveable)
>>
>
>
> It's a boat anchor.
>
>

[Ext User(Clockmeister)]

"Saus29" <myob@nosey.com> wrote in message
news:4357517f$0$28058$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
> not with NOS!

Correct, in that case it's just a bomb looking for a place to explode.

[Ext User(lx_350@hotmail.com)]

Hmmmmm, ok so the PCV valve should go to manifold vac. . can do that. .
but then why would you run a hose from the other rocker cover to the
air cleaner?? If you run the PCV to manifold vac, that seals one side,
but the other side is still open to the atmosphere by running to the
air cleaner, or does the man vaccum on one rocker cover make the other
side pull air in, rather then vent it out??????

Thanks for your info by the way. Oh and yes it's an LX

[Ext User(moon)]

<lx_350@hotmail.com> wrote in message
news:1129859419.215437.76790@g47g2000cwa.googlegro ups.com...
> Hmmmmm, ok so the PCV valve should go to manifold vac. . can do that. .
> but then why would you run a hose from the other rocker cover to the
> air cleaner?? If you run the PCV to manifold vac, that seals one side,
> but the other side is still open to the atmosphere by running to the
> air cleaner, or does the man vaccum on one rocker cover make the other
> side pull air in, rather then vent it out??????

yes, it draws fresh air from the air cleaner, purging the engine of
unwanteds along the way.
>
> Thanks for your info by the way. Oh and yes it's an LX
>

[Ext User(athol)]

Clockmeister <no-one@nowhere.com> wrote:
> "Saus29" <myob@nosey.com> wrote:

>> not with NOS!

> Correct, in that case it's just a bomb looking for a place to explode.

They don't need nitrous for that. :-p

--
Athol
<http://cust.idl.com.au/athol> Linux Registered User # 254000
The state of infrastructure in New South Wales is a disgrace.
I'm a Libran Engineer. I don't argue, I discuss.

[Ext User(athol)]

lx_350@hotmail.com wrote:
> Hmmmmm, ok so the PCV valve should go to manifold vac. . can do that. .
> but then why would you run a hose from the other rocker cover to the
> air cleaner?? If you run the PCV to manifold vac, that seals one side,
> but the other side is still open to the atmosphere by running to the
> air cleaner, or does the man vaccum on one rocker cover make the other
> side pull air in, rather then vent it out??????

In a closed PCV system, there is a breather into the air filter housing so
that petrol vapours from the crankcase don't escape into the atmosphere in
the same way as they do for an open breather.

Strictly speaking, the filter housing should be an original enclosed type,
with the crankcase breather on the opposite side of the housing to the
air inlet.

One thing that you're probably overlooking is that on a worn engine, the
PCV won't be able to handle the entire volume of blow-by and, at WOT, some
will come out the breather on the other side of the engine. On a stock
type air cleaner housing, this results in oil accumulating in the rim of
the housing between the breather (little sponge type filter on the side of
the housing) and the air filter element.

> Oh and yes it's an LX

I thought that you already said that?!?

--
Athol
<http://cust.idl.com.au/athol> Linux Registered User # 254000
The state of infrastructure in New South Wales is a disgrace.
I'm a Libran Engineer. I don't argue, I discuss.

[Ext User(Clockmeister)]

"athol" <me@privacy.net> wrote in message news:1129959068.946689@idlweb...
> Clockmeister <no-one@nowhere.com> wrote:
>> "Saus29" <myob@nosey.com> wrote:
>
>>> not with NOS!
>
>> Correct, in that case it's just a bomb looking for a place to explode.
>
> They don't need nitrous for that. :-p
>

lol yeah :-)

[Ext User(Dan---)]

athol wrote:

>
> They don't need nitrous for that. :-p

True in mu ol VP SS the 304 self destruct without needing any help
really. :-)


--
Regards
Dan.
Official Sponsor for International Fund for Animal Welfare (IFAW).

[JacksHj]

PS Don't let anyone tell you that the 253 is a crap motor. Mine puts
out waaay more torque that a stock 308 and I have spend about $1000 on
the engine so far (to keep it driveable)

i have a 253 that may need a bit of work can you tell me what you got for your $1000 and how many kw you get out of it cheers mate