Michael,
>From the description of the carburetors, they are not HS4's, or HS anything
for that matter. You do have SU carbs which are of the type HIF (Horizontal
Integral Float Chamber.) They were only made in the HIF4, HIF6 and HIF7
versions being 1.5 inch, 1.75 inch and 1.875 inch throttle bore diameters.
To my knowledge (veerry limited) the HIF carburetor was never outfitted on a
triumph; but rather MGB's. Have you tried the inlet manifold yet?
Regards,
Ed Hamilton
'80 Spitfire - currently with no carbs
Michael Thomas wrote:
> After finally getting my rear suspension to tolerable degrees of camber,
> my current project is the installation of a set of dual carburetors that
> I picked up with my '75 Spit. I have a few questions concerning the
> plumbing of them as I install them into my car. Currently, there is a
> single Stromberg carburetor with a set of headers and no emission stuff
> whatsoever.
>
> I believe they are HS4's -- the float chamber is integrated into the
> carb itself (underneath), as opposed to the chamber being off to the
> side as with HS2's. Is this a correct assumption? I have nothing in
> any of my manuals of anything other than the Stromberg and the HS2
> carbs, and I may have to order parts (due to a gas leak which I am
> currently trying to seal).
>
> So -- with regards to the plumbing: I have an electric fuel pump, and
> the fuel lines into the carb are already hooked up. It appears that
> there are return lines to the gas tank off of the sides of the carbs
> approximately 1" above the fuel inlets. I am assuming that a fuel line
> (currently un-used) that comes up past the battery is the return line to
> the gas tank. Does this sound right so far?
>
> Now, PCV hookups: From the rocker cover, a 5/8" hose originally went
> directly to the Stromberg carb into what looked like a PCV valve
> integrated into the carburetor. I _think_ that there is a y-adaptor
> that converts this to 5/16" hose that feeds into fittings on the
> carburetor immediately after the dashpot. I am guessing that I should
> also seal the NPT fitting on the top of the manifold that probably goes
> to some emissions thing that I don't have. Does this make sense?
>
> So, big question of the e-mail: Do I need an inline PCV valve? As far
> as I can tell, the line from the rocker cover goes directly to the
> intake airflow with no check valve whatsoever. Also to note, there is a
> bunch of stuff under the hood (charcoal cannister, anti-run-on valve)
> that is not hooked up. Will this be of any advantage to me for this
> installation (at least, until I have to get the emissions checked)? Or,
> just go with the PCV valve from a suitable GM product (any
> suggestions?).
>
> Thanks for the help, and I apologize to anyone who read this far for the
> lengthy message!
> At least I have something to do on Canada Day!!!
>
> Mike Thomas
> '75 Spit 1500
> Cambridge, Ontario
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