[TR] TR4A - This Seems Odd

[Bob]

Guy,

I run HS6s on my TR4. They came off a 67 4A. I have zero trouble with 
them. Car idles fine and throttle response is similar to my 3, which has 
H6s and my 6 which has the Hitachi HS6 carbs. I think you may have a 
vacuum leak somewhere, manifold most likely or maybe a problem with the 
float valve? What fuel pump do you use? I have the Facet model on all 3 
running about 2PSI at the regulator.

But even with the mixture nut all the way up, there will still be fuel 
to the throttle body that is if you have the needle installed on the 
piston correctly.

Bob

On 9/6/19 10:34 AM, G.D. Huggins wrote:
> All,
>
> Here’s another thing to ponder whilst I wait for my rebuilt lever 
> shocks to arrive..
>
> My engine will idle under the following conditions:
>
>   * Idle screws are backed off all the way, not touching the plate,
>     therefore not opening the throttle plate.  (In theory, they are
>     fully closed.)
>   * Mixtures nuts all the way lean. (In theory, there should be ZERO
>     fuel going into the carbs.)
>   * Both the throttle and choke are loosened from the linkage, making
>     sure jets are all the way up, and throttles are not sticking
>
> For the record, these are professionally rebuilt HS6 carbs, with super 
> throttle shaft bushing, perfectly centered jets, etc.
>
> In what is ostensibly a ZERO fuel/air mixture, how is this engine running?
> Do these engines just have a magic power to idle when starved?
>
> Has anyone else witnessed this on their own cars?
> If so, should I do anything?  If so, what?  (other than maybe looking 
> to make sure the needles/jets are matched correctly)
>
>
> Kind Regards,
>
> Guy D. Huggins
> gdhuggins at genfiniti.com <mailto:gdhuggins at genfiniti.com>
> 817.454.6415
>
>
>
>
>
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