Hello Friends,
Today I finished the RF axle and brakes and decided
to start the car and bring the engine up to
temperature. After getting it started (been a few
months since it has run) I balanced the carbs and
re-tweaked the carb balance. I then reset the linkage
adjustments and since the engine was at operating
temperature, I set the idle speed.
Here are some details with questions embedded. Please
share your opinions.
Car: 1970 Split-bumper MGB Tourer
Engine: 1965 18GB engine installed by some PO
Distributor: 25D4 #40879 A 864 w/10 degree c-adv.
Vacuum capsule: 54411230 5-13-10
Static timing: 10 degrees BTDC
Actual static timing: 10 degrees BTDC
Recommended timing: 14 degrees BTDC @ 600 rpm
Actual timing: 10 degrees BTDC @ 1000 rpm
Recommended idle: 600 rpm (?)
Actual idle: 800-1000rpm (lowest stable speed)
Question: Your cars actually idle smoothly at 600rpm?
Recommended points gap: 0.014"-0.016" gap
Actual points gap: 0.015"
Recommended dwell: 60 degrees
Actual dwell: 50 degrees
Question: Too much difference, recommend readjustment?
Recommended plugs: N9CY @ 0.024" gap
Actual plugs: N9CY @ 0.024" gap
Vacuum: Optimized to -16psi (gauge), measured at
manifold, and stable at idle (+/- 1/2 psi, max)
Engine smooth through entire engine speed range (up to
4k), once warmed up. No smoke of any color. Will do
a hot compression test, dry and wet, later and when I
next start the car. Little bit of valve train noise.
Nothing abnormal. Nice exhaust note if a little
rattly (old worn muffler).
I haven't yet set the air balance when on the
high-idle choke cams. Have to wait until the engine
is cold again to do it right.
Okay, one corner left to rebuild and a bleed of the
whole brakes and we're back on the road. Oh yea, I
have to repaint the wheels. Will just do a touch-up
spray job as they are not bad, just tatty.
regards,
rick / houston, tx
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