I had the same problem on an old Civic I owned when I went to a sidedraught
Weber and the manifold didn't have passages for coolant. I got stuck in
January with a frozen carb.
FWIW when I removed the coolant pipes on my 240 and then reconnected them it
made a huge difference in driveability and I still believe the coolant
warmed the gas/air mixture just enough to make the car driveable.
Mike
----- Original Message -----
From: "Ronnie Day" <ronday@home.com>
To: "Roadster List" <datsun-roadsters@autox.team.net>
Sent: Monday, January 22, 2001 8:47 PM
Subject: Re: manifold preheat
> >The time the fuel charge spends in the manifold
> >is not enough to significantly warm the mix, but believe it or not, you
> >may start 'icing up' on a drive at 40-50 degrees outside temperature if
> >you don't preheat the manifold walls. (Icing up is when you freeze
moisture
> >to the manifold walls, restricting the passages to the point of stalling
the
> >engine. Evaporating gasoline gets COLD).
>
> When we lived in Hawaii in the mid '70s, one of my proudest automotive
> acquisitions was a Warneford (Australian, I think) manifold for a single
> side draft twin throat carb. I used it with a 42 DCOE (yes, a 42) on an
> L-16 that had been massaged a bit. OEM head, but with Z-Valves, Norris
> cam (around 260 degree if I remember correctly) and the head ports
> matched to the intake. Never did get it to really work right due to the
> terrible mixture distribution, but the final nail in that particular
> coffin's lid came after we moved back to San Antonio in the summer of '75.
>
> I finally found some knowledgeable guys at a BAP in Houston and we got it
> running as well as it could, then in October we had our first cold spell.
> I hoped in the car and it ran fine until shortly after I pulled onto the
> freeway. Within a mile or so it felt like the car just ran out of gas.
> Pulling off onto the shoulder I popped the hood and was more than a
> little surprised to see gasoline icicles hanging from the airhorns (for
> some dumb reason I'd left the filters off, too). Yes, the manifold had a
> hot water bypass built into it so there was not manifold or carburetor
> heat. True story. I put a slightly modified OEM Hitachi on the car and it
> worked fine. Probably better than the Weber.
>
> BTW, do you know the difference between a Fairy Tale and a Sea Story? The
> Fairy Tale begins, "Once upon a time..." while the Sea Story starts, "Now
> this ain't no BS!"
>
> FWIW,
> Ron
>
> Ronnie Day
> ronday@home.com
> Dallas/Ft. Worth
> '71 510 2-dr (Prepared Class Autocrosser)
> '73 510 2-dr (Street Toy)
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