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200 Series General Forum for the Volvo 240 and 260 cars |
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PCV System with aftermarket Webers Help please.Views : 1256 Replies : 22Users Viewing This Thread : |
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Sep 11th, 2019, 09:37 | #11 |
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The 123 tune uses the vacuum signal direct from the manifold as fitted so that would be right. It is not an advance mechanism but a MAP sensor for ignition mapping
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Sep 11th, 2019, 09:52 | #12 | |
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I would keep those webers if this is the case ...
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Sep 11th, 2019, 11:11 | #13 |
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Sep 11th, 2019, 21:07 | #14 | |
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2) even if you had one without a vac connection the curve is now wrong for the change in air flow 3) modern fuel does not burn the same 4) logic would say with fitting webers you would also have gone for a cam with more lift/duration and a increase in CR further changing the burn |
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Sep 11th, 2019, 21:26 | #15 | |
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In my case of driving "old" cars for the last 47 years both standard and high compression tuned doing over 600,000 miles , i have found that when the unleaded was introduced in the 1980's it indeed was affecting things , hence the Renix mod on some of the 340's , However , today's unleaded is a fine fuel ...
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Sep 11th, 2019, 23:54 | #16 |
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I am not sure if its better or we just got more used to it
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Sep 14th, 2019, 13:16 | #17 |
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I am not sure what modifications have been done to the cylinder head bit it's not the original that's for sure it's date stamped 84 and the previous owner told me it had been ported and polished.
Regardless this is to be a daily driver and with the twin webers I would be lucky to see 20mpg, they would go out of sync more often then I would have the interest to balance them and I couldn't work out how to get the choke cable to pull on both carbs. So they are off the car now and a single weber which arrived yesterday is going on. I've set the advance cure to same Bosch number as the old distributor and I'll see how I get on. Assuming the 123 distributor can be connected to the vac port on the Weber and it doesn't need to come from the manifold? As for modern petrol it's horrible stuff. Stinks gives me a headache and rots rubber. Wasn't like that 10 or so years ago. |
Sep 16th, 2019, 15:30 | #18 |
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A brand new single carb sounds like a good option for what you’re going to use the car for- are you going to have the car set up on a dyno? I’m curious what power it’ll make.
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Sep 16th, 2019, 15:57 | #19 |
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well i always use it on my 11:1 compression ratio engines which used to like 5 star and no valve problems and good power , only problem it can "go off" if left a year or so , the active spirit must evaporate off more easily .
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Sep 19th, 2019, 00:41 | #20 |
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The 123 Tune should have the vac signal connected to the manifold rather than the carb.
Modern petrol has a life of about 3 months before it starts to go off |
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