[DeTomaso] Cain (AussieSpeed) Cleveland IDF Manifold

[Nolan]

Hello Jack,
I was able to smooth out the vacuum 'chatter' on a big stroker Datsun with
50mm side drafts. The local Datsun parts manager had an inline dampener for
the vacuum hose. It was like a one way check valve with a slow bleed. They
had them in stock as a fix for cars with jumpy advance plates. They worked
well for about $8 (20 years ago).

Take care,
Nolan 

-----Original Message-----
From: detomaso-bounces at poca.com [mailto:detomaso-bounces at poca.com] On Behalf
Of JDeRyke at aol.com
Sent: Sunday, January 27, 2013 1:56 PM
Cc: detomaso at poca.com
Subject: Re: [DeTomaso] Cain (AussieSpeed) Cleveland IDF Manifold

I managed to get enough vacuum from one leg of an IDA intake to actuate a
distributor vacuum advance. First, I used an 0.060" orifice on a hose bib
into only one leg of the intake. I tried ganging taps into many intake legs
but the vacuum from one seemed to cancel the next, giving a net of zero.
Then (this is critical) i used a 14" long rubber hose to run from the intake
to the distributor. The rubber seemed to eliminate most of the wild intake
pulsations between -20" vac and zero (or maybe a little positive), allowing
me to use a vacuum advance. 
It didn't work when I used metal tubing, braided steel line or left off the
sized orifice, and the length of rubber windshield-wiper hose might be
critical, too- I didn't experiment once I got something that worked. Looked
kind of odd- the fancy nickel-plated ram-tubes & Webers and all-Aeroquip
plumbing on & around the motor & brakes, except for that one scabby rubber
line. 
But I ran that engine successfully on the street for years with IDAs and
vacuum advance. FWIW- J Deryke.
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