[s-cars] Bypass valves - Which one?

[Mihnea Cotet]

I agree totally with Trevor on this one, the reason why the crank case oil 
fumes are being recirculated into the intake is because of some silly 
ecologists that have decided it should be so a few dozen years ago. I know 
they weren't that silly but the principle itself is anti-mechanical.

Though, with regards to detonation/pre-ignition, I guess it would take 
$hitloads of oil puking through the breather in order to produce 
detonation, but then it would mean that the engine is so FUBAR that it 
doesn't need to have any performance anymore...

Just my 0.02 Euros,


Mihnea

At 10:16 8/12/2003 -0800, Trevor Frank wrote:

>So I have some data from an oil manufacturer that says that oil in the
>crank case suffers from recirculation of the crank case vent into the
>intake.  In addition to displacing cool clean air, introducing crap like
>burnt and un-burnt hydrocarbons, reducing octane, etc...  Worse
>increasing combustion pressure because of non-compressible in the charge
>air and screwing up your ignition timing, i.e. to much pressure too
>soon, witch could lead to detonation/pre-ignition.  Then to add insult
>to injury also creates blow by that will degrade the oil in all sort of
>bad ways.
>
>Send it into the exhaust with an egr valve on it if you want the benefit
>of negative crank case pressure.  Get a smog pump or purpose made vacuum
>pump to run off the motor.  But on a high hp motor teetering on the end
>of oblivion it is, imho, dangerous to put it back into the intake.
>
>-----Original Message-----
>From: Russ Panneton [mailto:russ at panneton.name]
>Sent: Saturday, December 06, 2003 7:48 AM
>To: Joseph Pizzimenti
>Cc: QSHIPQ at aol.com; CaptMagu at aol.com; mlped at qwest.net; Trevor Frank;
>gary.m.lewis2 at BOEING.COM; s-car-list at audifans.com
>Subject: Re: [s-cars] Bypass valves - Which one?
>
>I thought the main reason to keep oil out of the intact tract was that a
>
>little oil reduces the effective octane rating of the gasoline, leading
>to more chance of detonation...
>
>Joseph Pizzimenti wrote:
>
> >Scott,
> >Not only does it help with combustion, but it also
> >helps keep your intake tract clean and help those
> >Samcos from popping off with all that oil.
> >
> >
>
>
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