The exhaust side is a low pressure side. If it were not the exhaust would
not go out the tail pipe.
Jeff Howard
Rayne LA
USA
'69 GT6+
'80 Spit
----- Original Message -----
From: "R. Ashford Little II" <ralittle2@mindspring.com>
To: "'Randall Young'" <ryoung@navcomtech.com>
Cc: "6-Pack" <6pack@autox.team.net>; "Triumphs@autox. Net"
<Triumphs@autox.team.net>
Sent: Monday, November 18, 2002 4:23 PM
Subject: RE: Blue smoke and good compression
> OK, first of all thank you for your opinions. BUT, I need to pose
> another question so I can get's me a little "edumaction." Basically, I
> have a question as to whether the blue smoke is being caused by a
> worn/bad oil ring in number 2 or as most have said by worn valve guides.
>
>
> The question is this: since I get more smoke at upper rpm's, but the
> manifold vacuum pressure is less at upper rpm's than at idle, then why
> doesn't it smoke more at idle than at those elevated rpm's?
>
> If we are using manifold pressure as the source to pull oil down the
> guides then it would appear that it would smoke at low to mid rpm's more
> than at high rpm's.
>
> I truly hope I'm missing something basic here since head's are cheaper
> than engine rebuilds.
>
> Thx,
>
> R. Ashford Little II
> www.geocities.com/ralittle2
>
>
> -----Original Message-----
> From: Randall Young [mailto:ryoung@NAVCOMTECH.COM]
> Sent: Monday, November 18, 2002 4:48 PM
> To: R. Ashford Little II
> Subject: RE: Blue smoke and good compression
>
> I agree, most likely cause is worn intake valve guides, allowing oil to
> be
> sucked in by manifold vacuum. Another, less common cause is blowby
> forcing
> oil mist into the crankcase vent system, and eventually into the vacuum
> fittings on the carbs. You can actually have a fair amount of blowby
> and
> still have good compression readings.
>
> Randall
>
> > -----Original Message-----
> > From: R. Ashford Little II [mailto:ralittle2@mindspring.com]
> > Sent: Monday, November 18, 2002 10:06 AM
> > To: Triumphs@autox. Net; 6-Pack
> > Subject: Blue smoke and good compression
> >
> >
> > Those two things don't usually go together so I was wondering if there
> > is a "typical" reason why an engine with good and consistent
> compression
> > (~145) would blow blue smoke at the upper rpms? It would seem to me
> > that if I've got a bad oil ring, in #2 cylinder, then I would have
> other
> > issues as well that would lead to bad compression. But that's not the
> > case. Makes me wonder what else I'll find when the engine comes
> apart.
> >
> > R. Ashford Little II
> > www.geocities.com/ralittle2
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