I was struggling slightly keeping temperatures to a reasonable limit - standard 1600 engine. However after someone else's thread on here about jet sizes I found I was running a 127 main vs the suggested 130 main (it was what came with the Chinese carb - there was a 130 in the box but labelled for 1641cc). Changed it over for a genuine 130 solex - its made a decent difference, with yesterdays temps staying round the 95 degree mark rather than the 110 they were at. Another run is needed to confirm, but it looks much better. 0.025mm diameter doesn't sound like much of an increase, but its around 4%, so it does make a surprising difference....
The ambient air temperature makes a big difference, we are now about 21C rather than the 32C we had last week. I find with my mgb when the air temperature is lower and with moist air, the engine is at its happiest, even with a water cooled engine.
130 main 60 emulsion 60 accelerator pump tube. Started at 65 on the idle jet and came down to 55 before it felt right. Sounds like a different van now and pulls very smooth the flat spot has gone. Sent from my SM-G930F using Tapatalk
Hmmm ... Interesting ... Might have a play as i always blamed the 009 i was running on the flat spot but it`s not as `strong` mid range as i`d expect . I`ve a few carbs kicking around so might be worth having a play ... Thanks for the inspiration
Perceived wisdom on t'internet is that 009 needs extra fuel to over come flat spot, so extra large idle and massive accelerator pump squirt settings. I have found this makes it worse, and a relatively 'normal' setup is much better. I found the hot air and pre heat setup made much more of a difference.
I kind of agree and disagree at the same time! A cheap generic (Chinese) 009 is awful - I had one that came free with some heads as part of a kit. It fully advanced at idle as it was missing the advance springs. The lobes were also unequal, so points gap varied depending which lobe you set it on. Most of the generic (Chinese) SVDA's are also a bit iffy - they feature vacuum advance but also shaft slop and general low quality build. I've had a couple and even with the requisite kink in the vacuum hose the diaphragm has split in a few thousand miles. I have a genuine Bosch 009 and I honestly think it is better than the vast majority of new dizzys for sale - not as good as a genuine VW vacuum dizzy, but I'm yet to come across one for sale with all the bits working. Equally not as good as the 123, but that's out of my price range.
I'd seen this one - it seems to suggest it is a Bosch, but the picture makes me think generic Chinese! http://www.simonbbc.com/distributor...h-powerspark-electronic-distributor-vw-beetle
