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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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B20A top speedViews : 2462 Replies : 46Users Viewing This Thread : |
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Jun 16th, 2020, 13:01 | #21 |
VOC Member
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Location: Chatham
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The Stromberg may well act the same as the SU when you partially raise the piston. When correct revs will rise and then settle back to normal. Your carb probably has a temp compensator on the side in a small rectangular box. This shouldn't be messed with but all should be working and clean inside. It's a bi metal strip that makes small adjustments to the mixture. Sophisticated by SU HS6 standards but there is probably something similar in the later alternate SU 44HIF. That carb may well work better than a Stromberg and doesn't suffer from spindle leak problems like the SU.
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Jun 17th, 2020, 01:03 | #22 |
Trader Volvo in my veins
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Back to the original question
late 131 with B20A with only mod being a late recon head (same spec as E heads) would do just over 115MPH in 4th - no OD 140's with a 4 speed and exhaust typically about 110MPH flat out in top My slow 145 Auto is slow past about 80 but eventually get to just over 100indicated but in real terms only 95 on GPS The biggest restriction is the exhaust |
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Jun 20th, 2020, 19:21 | #23 |
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Changed the diaphragm, got the carb piston working nicely, screwed in the mixture screw as far as it can go, new air filter, new coil, new spark plugs and leads, new fuel filter, new fuel pump, checked timing and went for a spin with my wife and dog. Well night and day, got to 60 and it just wanted to keep revving. Very windy and on a back road but up to 85 and was still going. Then a couple of times on the way home too on the dual carriageway way but wife wasn’t impressed so slowed down. She is no speed demon but much better. I still have a new needle and adjustable jet to fit.
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Jun 20th, 2020, 20:17 | #24 |
arcturus
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Did you have your ear plugs in?
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Jun 20th, 2020, 20:36 | #25 |
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It’s not too loud really.
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Jun 20th, 2020, 21:57 | #26 |
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Jun 20th, 2020, 22:13 | #27 |
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Ha ha oh, no it was just the look and the tense silence. :-)
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Jun 22nd, 2020, 12:04 | #28 |
arcturus
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You need to check speedo against GPS they can be anywhere between5% and 10% fast
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Jun 22nd, 2020, 12:38 | #29 | |
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Quote:
Did a compression test yesterday and all 150 apart from cylinder 1 which was between 145 and 150, so fine. Car has only done just over 70000m so should be a good amount of life left in the engine. There's a group of Amazon owners visiting later this year so will see how their cars/engines compare. Next main job is to install the new and upgraded suspension and then renew the steering.
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Jun 28th, 2020, 12:25 | #30 | |
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Last Online: Aug 2nd, 2022 10:46
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Quote:
Well last year, my car went locally for the fitting of a 123 'tune' Dizzy, and it was after a 'LOT' of procrastination, my thinking that the original still worked perfectly (as much as I could tell) after 50 years but the lure of better running, smoother idling piqued my curiosity and finally got the better of me, note here, I didn't do it to avoid changing points, I actually thoroughly enjoy that. To be entirely honest, did it idle a smidge smoother...yes and although you noticed, it was not night and day, could I tell any difference at any other road speed, not in the 100 miles use I had from it, yup you read that correctly, 100 miles.....it failed on me, and yes it was brand new, top model (123 Tune) and installed by the pro's, luckily I was on a back road and being a doubting Thomas had the original in the boot so managed to re-install it, and twist it backwards and forwards until she fired and for it to get me home. I'm sure I was unlucky, although I have been told 'they do go wrong' (yes everything does) so I presume many of you may have them and have had no real issues, any of you racked up fairly decent mileages on one yet? Mine was sent off and returned as new but still not brave enough to trust it again at the present. Last edited by amaz'in; Jun 28th, 2020 at 14:33. |
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