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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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I've never had so much trouble with SUs before, please help!Views : 5217 Replies : 42Users Viewing This Thread : |
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Jul 28th, 2022, 23:19 | #41 |
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I don't know if the .90 jet is physically the same as the .100 one as far as it fitting the carb. As it has a smaller bore I guess it could run out of gas at full throttle and top out at 4k revs. You could probably get it to idle OK. Proper SU jets have a coloured ID band on them. Yellow for front carb and red for rear carb. Don't know what the physical difference is as far as fitting them incorrectly. Pity you have ditched the bad ones, I'm sure Ron would have liked to get his hands on them. Maybe a pair of .90 tubes were incorrectly fitted to .100 fittings?
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Jul 29th, 2022, 06:17 | #42 | |
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Jul 29th, 2022, 13:45 | #43 |
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Indeed...!
It's a stretch to imagine what on a set of jets could have been wrong...they had to be 0.100"! (with 0.090"s, the Metering Needles would have jammed)...the only other thing I might suggest is a flow restriction in the Jet Supply Tubes...either at the Jet crimp end, or at the slightly tricky compression fitting at the Bowl end (perhaps the anti-compression sleeve "Fuel Line Insert" inside the tube was not in place which allowed the tube to be crushed, restricting flow... Ref: https://www.sw-em.com/SU_HS6_Jet_Supply_Line_Seal.htm ). Too bad...I would have liked to root cause the issue...we'll simply have to let it stand as a fuel flow restriction of unknown specific cause. Cheers Last edited by Ron Kwas; Jul 29th, 2022 at 13:48. |
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