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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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Sep 18th, 2018, 15:24 | #11 | |
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All said, I'm pretty confident your running on problem is fuelling. I have no knowledge of Weber, but surely you can adjust the float height or needle height, no? Then perhaps there's a separate screw adjuster for trimming the mixture? What happens if you unscrew the mixture screw? Better or worse?!
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Sep 18th, 2018, 15:39 | #12 |
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I runs rougher either way I go on the screw. The manual says ideal is 1 1/2 turns out. I need it to be 3/4-1 turn to sound correct. If I turn it out it will run rougher. So in that case the mixture screw is working. This is a really bad run on. It will knock and kick for 15-20 seconds and then light up and run for 15-20 seconds or more.
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1962 Volvo PV544 1951 Studebaker Starlight State Commander Coupe 1953 Studebaker Starlight Commander |
Sep 18th, 2018, 18:00 | #13 |
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Sounds as if your idle jet is too large. If for example, if it is a 60, try a 50 or 55. I'd start with a 50.
The idle screw should be very close to 1 1/2 turns out if the idle jet is correct. Less means too big and more means too small. The Weber idle circuit affects the mixture up to about half throttle so is critical. |
Sep 18th, 2018, 18:41 | #14 |
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Right now the idle jets are 60/50 60 being on passenger side next to mixture screw. I flipped them around and that changed everything. Now screwing the idle mix in kills it. But screwing it out does not help much. I am getting carb backfire now. I am on my way to pick up two 55's. I will try that. That is what the diagram said was stock. All the other jets are stock.
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1962 Volvo PV544 1951 Studebaker Starlight State Commander Coupe 1953 Studebaker Starlight Commander |
Sep 19th, 2018, 08:57 | #15 |
arcturus
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As a matter of interest does the timing have any effect on engine temp'? For example will an over advanced timing cause the engine to run hot? I know that a weak mixture would do that.
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Sep 19th, 2018, 08:59 | #16 | |
arcturus
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Sep 19th, 2018, 15:03 | #17 |
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I am having trouble with overheating in general. However in the cars defense, while I was driving here yesterday it was 40.6C/105F. I do think she runs a bit cooler now that the timing is at 10 Degrees instead of 16. I will find out today if the new jets help in cooling her down. I game to switch carbs but I would need the manifold as well.
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1962 Volvo PV544 1951 Studebaker Starlight State Commander Coupe 1953 Studebaker Starlight Commander |
Sep 19th, 2018, 19:06 | #18 |
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Inserted the 55 jets and timed to 10 and idle 800 all like specs say. So far so good. No carb backfire. Have not driven it long enough to test run on but will later. It started to ran.
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1962 Volvo PV544 1951 Studebaker Starlight State Commander Coupe 1953 Studebaker Starlight Commander |
Sep 21st, 2018, 04:06 | #19 |
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Took her on a long drive in town and freeway. Never felt better. No hesitation, no run on, no backfire out of carb. No stuttering. The correct jets seemed to have done the trick, was 96 degrees today and she ran just over half on temp. She is set at 10 degrees and 780 rpm. Thanks for the suggestions. She goes to a 4 day show next week. 550 cars up in the mountains. She will be in the foreign sports car class. Hey, it says sport on her.
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1962 Volvo PV544 1951 Studebaker Starlight State Commander Coupe 1953 Studebaker Starlight Commander |
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