First post, torque converter question
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4wd Low
Joined: Feb 2020
Posts: 10
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Ahh. Well, no Cobra engine. Glad to know that now. When I had the heads off all eight cylinders looked great. The cross hatching was still visible. There was no ledge at the top of the cylinders. I'll check the compression anyway to include or exclude that possibility. I'll pick up a can of carb cleaner tomorrow and try that first. Thanks for the tips!
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
I would not drill the throttle blades. Not sure about those Avenger carbs, but most Holleys you can adjust the opening of the secondary blades. A slight change there will affect the draw on the primary side and change your adjustments for idle mixture.
Thread Starter
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4wd Low
Joined: Feb 2020
Posts: 10
Likes: 0
Today's progress...
I set the timing to 22° and took a test drive. Poor thing was knocking bad so I returned home and re-read this post. I noticed that Freightrain mentioned a secondary throttle plate adjustment so I watched a video on the subject. Luckily I had a very short flat screwdriver that fit the screw without having to remove the carb. I moved the secondary throttle plate screw 1/2 turn, started and noticed the engine was idling around 1300 rpm. I backed the primary throttle plate screw completely off the stop and had an idle of around 1100 rpm. I set the timing to 16° which brought the idle down to 800 rpm. I set the primary throttle plate screw to a 900 rpm idle.I adjusted the idle mixture screws 1 turn in for 15" of vacuum, 900 rpm idle in park and a steady 600 rpm in gear. It turned out that the secondary throttle plate adjustment was the key to getting this thing to behave.
HUGE thanks to Freightrain for the tip!!!
I set the timing to 22° and took a test drive. Poor thing was knocking bad so I returned home and re-read this post. I noticed that Freightrain mentioned a secondary throttle plate adjustment so I watched a video on the subject. Luckily I had a very short flat screwdriver that fit the screw without having to remove the carb. I moved the secondary throttle plate screw 1/2 turn, started and noticed the engine was idling around 1300 rpm. I backed the primary throttle plate screw completely off the stop and had an idle of around 1100 rpm. I set the timing to 16° which brought the idle down to 800 rpm. I set the primary throttle plate screw to a 900 rpm idle.I adjusted the idle mixture screws 1 turn in for 15" of vacuum, 900 rpm idle in park and a steady 600 rpm in gear. It turned out that the secondary throttle plate adjustment was the key to getting this thing to behave.
HUGE thanks to Freightrain for the tip!!!
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