On 30 Jun 2007 at 18:43, Paul Dorsey wrote:
> Doesn't the SU Carb. dash pots/oil level/Carb dip sticks determine the carbs
> throttle reactions? Especially under load?
The dashpot oil doesn't really affect operation under load. It acts
to slow down the piston reaction when you first open the throttle,
but the piston then moves into place fairly quickly. In other words,
it acts as the accelerator pump in a conventional carb. After the
first second or so when you step on the loud pedal the piston has
settled into its new postion.
> I think both SU's are suppose to act identical,...right?
Normally they would. Note that if their idle screw settings are
different then the first little bit of throttle you give it will
affect one carb more than the other. Also if the linkage isn't set
to open them the same amount, one may open more than the other. This
is just a mechanical thing. It isn't super sensitive but you do have
to have them balanced mechanically before it makes sense to wonder
why they don't seem to be behaving the same.
> Would there be any good likelyhood that thinner oil in one carb. might help
> sychronize their movements?
I wouldn't think so.
> One of my SU H6's dip stick's presses laterally on the piston's tube, so that
> it doesn't operate correctly. Is this often corrected by simply bending the
> dip stick?
> This unequal rubbing proably won't affect idle, will it?
Shouldn't affect idle. I wonder how the dipstick got bent! You may
be able to straighten it, but I wouldn't be surprised if it turns out
to be hard to get right.
--
Jim Muller
jimmuller@rcn.com
'80 Spitfire, '70 GT6+
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