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Post by Zed on Mar 8, 2020 11:11:38 GMT
I've decided that as I will have to get a better exhaust system and that the stock system is unsuitable even now, I'll do that first, in the interests of science but mainly the hope that if it lets it rev more freely I'd probably settle for that which would save a lot of oily heavy shite and a too many hundreds of earth units on cam, followers, gaskets, bearings and seals.
I notice Vintage Speed have hugely broadened their catalogue with exhausts stated to be up to whatever HP and some actually state good for up to 2400cc which is obviously a tempter. I'll have to ditch the heat exchangers too, as primaries they are too small.
So...I'll have to rig the Eber to be controlled from the front, blow into the main duct to clear the windscreen and not blow out when I'm driving.
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Post by 77westy on Mar 10, 2020 20:14:56 GMT
For 2.3l CSP recommend J tubes and a 45mm Python exhaust but I wanted to keep the heat exchangers so I went for the smaller 42mm exhaust. Top end power will suffer but gas flow at low revs is higher which helps the low-end torque. Exhaust valves are 34mm, exchangers 38mm, Python primaries are 42mm and after the collector 62mm. It seems to work fine and although a larger exhaust system would probably release a few more BHP at peak power I’d rather have the torque.
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Post by Zed on Mar 11, 2020 7:41:28 GMT
For 2.3l CSP recommend J tubes and a 45mm Python exhaust but I wanted to keep the heat exchangers so I went for the smaller 42mm exhaust. Top end power will suffer but gas flow at low revs is higher which helps the low-end torque. Exhaust valves are 34mm, exchangers 38mm, Python primaries are 42mm and after the collector 62mm. It seems to work fine and although a larger exhaust system would probably release a few more BHP at peak power I’d rather have the torque. I was reading somewhere on TLB that Holmsen's bus has a 2.4l with exchangers and he was reporting no problems. If you have time I have a thread on Samba and have included some details of my HE hackery and what I discovered about the differences in the primaries within between OG and repro. I'm not able to measure, but I think the original is likely less than 38mm where the repro is bigger. Got me wondering if VW made them with different size primeries for engines/vehicles, but more likely the repro took an average. I have it in mind that the primaries within the exchangers of vary in size as they pass through, from large at head through much larger in the exchanger and slightly smaller than the head end where they meet the silencer.
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