From Snag@21:1/5 to All on Tue Jul 12 16:39:41 2022
I've got one on my rebuilt with mods GM 305 . I'm having problems
getting it dialed in , not surprising since this is my very first ever
Holley .
The carb in question is an 1850 600 cfm with center pivot bowls from
a 3310 . Stock jetting and metering plate . The motor is a 305 bored
.060 over with flat top pistons for about 9.7:1 C/R , Elgin E-922-P cam*
, small tube headers and an Edelbrock Performer manifold .
*cam specs are .444 /288°(214 @.050) intake .463/298° (224 @.050)
exhaust , lobe centers 107/117 and 112° lobe separation .
One problem is getting it to idle properly . I had the idle speed
screw in so far the transition ports were halfway uncovered and the idle
mix screws had no effect . On the advice of a Motor Trend article I
drilled a .093" hole in each of the primary throttle plates , which
allowed my to close the throttle enough that the mixture screws now have
an effect - but maybe not enough , as I'm only about 1/2 turn open on
the mix screws . I'll be pulling it off to see how much of the
transition port is uncovered , might need to enlarge those holes a bit
or open the secondaries a touch , another suggestion from that MT article .
The other problem is that it seems extremely easy to flood the motor
. I hit the pedal once and pull the choke partway out (it's like 90°
out) , turn it over and it catches then dies . Pump it once more and
open the choke a little bit might fire , but it seems to take a lot of
cranking to get it lit . The floats are set dry centered in the upside
down bowl , I can't keep it running long enough to adjust the level . It
was loading up at idle - I think due to unmetered fuel from the
transition ports - and spark plugs were carboned up , tailpipe is sooty
too . I'll be picking up a new set of plugs next trip to town .
Any suggestions at all will be considered , just don't tell me to
inject it cuz the wife is already thinking I'm spending too much money
on my toy ... doesn't help that I found a rock embedded in the drive
belt of my Harley this morning , that's another (transmission/primary
drive repairs/replacement) project that's turned into a money pit .
--
Snag
“Free speech is my right to say what you don’t
want to hear.” -George Orwell
From Bill W@21:1/5 to Snag on Thu Jul 21 19:14:58 2022
On Jul 12, 2022, Snag wrote (in article <takpmu$24u2l$1@dont-email.me>):
Any suggestions at all will be considered ,
I would do what we always used to do in the past which was to take it apart
and clean it out, and make sure the jets and floats and springs are
working.