[Healeys] BJ8 HD8's

[BJ8 Healeys]

Gary, I found the SU carb tuning instruction manual plenty confusing due to
the tendency to give more than one name to the same component.  Also, tuning
instructions are given for the single HD carburetor, but for multiple carb
installations like on the BJ8 the book refers you to the section for Type H
carburetors which don't even have the same adjustment screws.  Thus the Type
H reference to "Throttle Adjusting Screws" that don't apply to the HD8.
 
I gave up on the SU manual, and from various sources I re-wrote the HD8
tuning procedures for my own use, making sure to use the same nomenclature
throughout for the same part so I wouldn't confuse myself.  I also
illustrated it with photographs.  The procedures are attached FYI.
 
The Slow Run Valve is used to set the idle to 500 - 600 RPM, at which point
you adjust the mixture with the Jet Screws.  Once the mixture is correct at
idle, it should be correct throughout the range of operation of the
carburetor and you can increase the idle speed of the engine for normal
operation using the Fast Idle Adjusting Screws.  I adjust my carbs for 1000
RPM.
 
The book intends to say:  "1/2 inch below the top of the hollow piston rod"
for the level of the damper fluid.  I just check the level whenever I'm
about to take the car on a trip and top up as necessary.
 
Happy Healeying!
Steve Byers
HBJ8L/36666           
BJ8 Registry
Havelock, NC  USA
 
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net]
On Behalf Of warthodson at aol.com
Sent: Tuesday, April 05, 2011 9:16 PM
To: healeys at autox.team.net
Subject: [Healeys] BJ8 HD8's
 
1. Were any of the BJ8 HD8's fitted with the mysterious "throttle adjusting
screws" mentioned in some of the SU (Burlen) tuning instructions? Not to be
confused with the "slow run valve", "fast Idle screw", "jet adjusting screw"
or even the "plate retaining screw".
2.  On BJ8's (multi-carb instructions) when no "throttle adjusting screws"
are
fitted, do you adjust the idle with the "slow run valve" as described in the
SU instructions or do you close the "slow run valves" & adjust the idle with
the "fast idle screw"?
3. The SU instructions say that "on non-dustproofed carburetters, identified
by a vent hole in the piston damper top, the oil level should be 1/2" above
the top of the hollow piston rod." It seems to me that any oil above the top
on the hollow piston rod would slowly drain down into the bottom of the
piston
& then thru the transfer holes into the carb body. Does anyone actually fill
their "non-dustproofed" carbs this full? How often does the oil level need
to
be topped up on these carbs?
Thanks,
Gary Hodson

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