If I'm interpreting the pictures correctly it looks like drawing from
the valve cover is the only place you need to draw from. Although it
sounds like you can also draw from any other location that would be
accessible.
Am I missing anything?
Brad
On Wed, Feb 1, 2012 at 10:02 AM, Bob Kramer <rkramer3@austin.rr.com> wrote:
> It looks like it might be worth trying to set up my vacuum system properly
and
> see just how bad the rear seal really is. Mine sucks from the draught tube
> location, easy access to oil and too many leaks in to the engine.
>
> Sent from my iPhone
>
> On Feb 1, 2012, at 7:26 AM, n197tr4@cs.com wrote:
>
>> nicely done Randall.....thanks.
>>
>> note: some suppliers have added a 'V' notch in the 45 degree angle tube
>> making it resemble a kid's whistle. intuitively this makes sense in
> increasing
>> the efficiency of the air flow. i assume some form of testing was done or
> it
>> is a principle.
>>
>>
>>
>> Joe Alexander
>> A. R. E.
>> 645 1st Street
>> Jesup, Iowa 50648
>> 319.464.4711 (cell)
>> n197tr4@cs.com
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: Randall <tr3driver@ca.rr.com>
>> To: 'sherry robyn' <sherryjimmy6116@att.net>
>> Cc: fot <fot@autox.team.net>
>> Sent: Tue, Jan 31, 2012 8:43 pm
>> Subject: Re: [Fot] VACUUM SYSTEM
>>
>>
>> I'm not Joe, but maybe I can help out. Here is the other photo, which
>> pretty much shows the entire system:
>> http://goo.gl/AZ9W6
>>
>> The orange hose is high-temperature silicone, connected to the original
(?)
>> vent at the rocker cover and to a reed valve (aka check valve) that is
>> welded into the exhaust header with the end protruding into the exhaust
> flow
>> and the cut side facing downstream. The original road draft tube (if you
>> had one) is blanked off, as well as any other openings into the crankcase
>> (like the fill cap on my TR3).
>>
>> The concept is that every exhaust pulse (cylinder firing) sucks air out of
>> the tube. When it does, the reed valve opens and sucks air from the
>> silicone tube. Thereby pulling a modest vacuum on the crankcase, which in
>> turn helps pull oil back through the rear main seal.
>>
>> The big advantage, as I see it, is that the exhaust pulses get stronger at
>> full throttle, while the intake manifold vacuum (for the original PCV
> system
>> on later TRs) goes away entirely at full throttle. This avoids the
buildup
>> of pressure in the crankcase caused by the factory PCV systems, which
tends
>> to blow oil out past the rear main seal (and everywhere else).
>>
>> Here's a typical kit:
>> http://goo.gl/qfEsq
>>
>> -- Randall
>> _______________________________________________
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>>
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