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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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Dash pot oilViews : 1457 Replies : 21Users Viewing This Thread : |
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Jul 18th, 2018, 14:16 | #1 |
arcturus
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Dash pot oil
I know that the book recommends ATF or similar but what effect would it have on performance using a heavier, engine oil for example, or a lighter oil ?
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Jul 18th, 2018, 14:46 | #2 |
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a heavier oil would make the piston rise slower restricting power and increasing fuel consumption .
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Jul 18th, 2018, 17:08 | #3 |
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Stromberg carbs should use ATF
SU carbs should have SAE20 oil but I find 10w40 works well. Slightly thicker oil will give more enrichment is acceleration, something these engines tend to need. |
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Jul 18th, 2018, 19:58 | #4 |
arcturus
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That was my understanding. Thicker oil slows the rise of the piston under heavy acceleration and momentarily causes a richer mixture.
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Jul 18th, 2018, 21:17 | #5 |
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ATF is more stable across a range of temperatures
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Jul 19th, 2018, 12:26 | #6 |
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ATF is more stable, because it is single weight. Straight SAE20 weight oil is ideal really, in my experience, and as recommended by SU/Burlen: http://sucarb.co.uk/technical-carbur...gs-chamber-oil
I found some single 20w oil for much less however (I think it was for a lawnmower, can't remember). 10w40 etc would change characteristics as the engine warmed up.
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Jul 20th, 2018, 12:27 | #7 | |
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On my stage 1 tuned Mini, I used richer needles and still got it to pass emissions.
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Jul 20th, 2018, 13:15 | #8 | |
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The only car I've driven which even comes close to the handling of that 997S is my son's Japanese grey import '92 Eunos/MX5 - it produces the same grin factor when you start it up and slot it in gear...sadly, (nah ) it is sat on our drive and I am forced to drive it every week or so to stop the brakes sticking/seizing.....the C70 almost does it but can't quite get the hang of this new-fangled thing called aircon in a cabriolet, but then the Eunos also has it - still can't figure out why anyone would need air-con in a ragtop!
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