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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 : 1507 Replies : 21Users Viewing This Thread : |
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Jul 20th, 2018, 07:20 | #11 | |
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I eventually sold the Weber set-up and went back to SUs with 20/50SAE in the dash pots (Duckhams Q worked best) using twin 1½s on a flowed manifold which seemed to work better with the longer dwell Janspeed cam. In real terms it was over tuned for a road car, but was an absolute delight to drive...it was just waiting for the car in front at traffic lights to get 20 or so yards ahead before you let in the clutch that was a pain!
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The saddest moment is when the one who gave you the best memories....becomes a MEMORY V70 SE 2004 2.3L T5 Geartronic, C70 2005 2.0T Automatic, Sold 2.4l 20 Valve Automatic Torslander Sold 854 GLT 20v Auto |
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Jul 20th, 2018, 12:27 | #12 | |
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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 | #13 | |
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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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The saddest moment is when the one who gave you the best memories....becomes a MEMORY V70 SE 2004 2.3L T5 Geartronic, C70 2005 2.0T Automatic, Sold 2.4l 20 Valve Automatic Torslander Sold 854 GLT 20v Auto |
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Jul 21st, 2018, 21:28 | #14 |
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I miss my custom mini pickup... No electronics, just clean pure fun..
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Jul 22nd, 2018, 21:34 | #15 |
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I have used a special 'v8250' home brewed mix for many decades now, that is thinner than what SU/Burlen Fuels suggest. It allows, combined with correctly spec'd springs, much quicker take up, excellent idle and excellent stability throughout the rev' range.
A 50/50 blend of 10w/40[or 20w50] with 3in1 will do very well for most road applications. It's really worth adding this book to this years birthday or Christmas present list... https://www.amazon.co.uk/Build-Power.../dp/1901295141 ps I use something altogether different and sometimes have the fastest off-the-line SU's...the recipe's tip-top secret but does include super thin sowing machine oil |
Jul 23rd, 2018, 10:04 | #16 |
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I used air tool oil years ago because the garage had loads of it and it cost me nowt.
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Jul 23rd, 2018, 15:00 | #17 |
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AS; "the richer needles" implies there are a limited number available...in fact, I have no less than 3 8 1/2" X 11" pages full of dimensional data for metering needles for 0.100" Jets, the sizes of which are given in ten thousands of an inch accuracy (!)...determining which is "the one" for your engine configuration takes some engineering, and trial and error, accompanied by solid research and practical load tests, not just a quick look at the list...
Forum; Dashpot oil is indeed crucially important to be present, but viscosity 20W +/- is just not that critical for anything but where its necessary to get the absolute best out of the engine (and this applies only to transitions ie throttle response!), consequently a lot of people play with viscosity and swear they get a noticeable result...I have to question that...now if I had a lightened Flywheel and Intake and Exhaust flow which allowed a much faster throttle response, I might be tempted to try varying the viscosity (if I had a dyne or a lot of track time to check it). Cheers Last edited by Ron Kwas; Jul 23rd, 2018 at 16:19. |
Jul 23rd, 2018, 18:06 | #18 | |
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Access to the data to which you refer was rarely available in those times, most BMC/Leyland dealers only carried standard needles, indeed even locating richer/weaker needles was a question of "ringing around" the county (Kent, Surrey, & Sussex at the time) to find alternatives. Those I found came from a now defunct small engineering/racing engine builder some 60 miles away. Much of what was achieved was by trial and error and I assure you there were many errors; in stage 3 tune it was running a tuftrided racing cam (Piper's seemed less prone to wear than Janspeed's at the time), triple valve springs, coupled with a Lotus derived duplex timing chain with the associated gear mods, tuftrided fully balanced crank & lightened flywheel, plus a competition clutch - the engine was redlined @ 10,200rpm on 5* fuel meaning only one gear change was necessary to hit 60mph in a shade under 6.1 seconds - not bad on the 10inch wheels - it literally was a very hot little motor and would blow away most sports cars from a standing start, leaving many an Elan in its wake. Various heads were used over time, the best coming from a frogeye sprite which had a little more metal to play with when it came to skimming & smoothing again compression ratios of 10.6 to 13.1 were used over time - the best set up was achieved using 12.3:1, anything more than that just didn't work as road car + five star fuel aka the old leaded 101 octane became increasingly difficult to find at the roadside hence the sale of that wonderful engine in the summer of '75. The twin 1.5" SUs on "normal" needles and Duckhams Q 20/50 made for a much more tame drive, but still enabled a very fast take off without the thirst of the Webers. The point being that the SUs were designed for an SAE20 oil.
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The saddest moment is when the one who gave you the best memories....becomes a MEMORY V70 SE 2004 2.3L T5 Geartronic, C70 2005 2.0T Automatic, Sold 2.4l 20 Valve Automatic Torslander Sold 854 GLT 20v Auto Last edited by ASt85; Jul 23rd, 2018 at 18:37. |
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Jul 25th, 2018, 02:08 | #19 |
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Ron, as usual I agree with most all you say, except the part about the need for a dynomometer to get it exactly right when f**king around with different needles and other stuff e.g. oil, ignition, flow alterations, etc...
I recently traded my 16' B20-powered speedboat for, among other things, an old working top-of-the-line Snap-On Exhaust Gas Analyzer (tailpipe "sniffer") and an Ignition/Fuel Injection Oscilloscope (way overkill for our simple cars). Looking at CO readings from tailpipes of modified cars is something I've always wanted to do, and is a definite gas. Best, from the chilly North
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Jul 25th, 2018, 12:35 | #20 | |
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