TonyR Posted February 8, 2003 Share Posted February 8, 2003 What sort of power can be achieved by upgrading a 1.6 K series Supersport while retaining the standard plenum? Tony Link to comment Share on other sites More sharing options...
Luke Beaumont Posted February 10, 2003 Share Posted February 10, 2003 The rough calcs I did based on the flow of the VVC plenum indicate about 170bhp as a maximum. You have presumably got the plastic plenum, which I would hazard a guess is even more restrictive - why else would Rover have used a different one for the VVC. Link to comment Share on other sites More sharing options...
oilyhands Posted February 10, 2003 Share Posted February 10, 2003 The VVC plenum has been proved to support up to 185BHP, the plastic plenum isnt that restrictive, the main difference is in the *volume* of the plenum rather than its thruput. I'd say with a larger TB (The trophy 160) it would be capable of supporting 170BHP, the most I have seen is 165BHP, but I wouldnt recommend extreme cams with a plenum, the pressure waves in the plenum will make idle fairly rough and progression quite jumpy. Oily Link to comment Share on other sites More sharing options...
robmar Posted February 10, 2003 Share Posted February 10, 2003 so what are talking about mild head porting cams (supersport or other) decent exhaust emerald verniers anything else? rob Link to comment Share on other sites More sharing options...
oilyhands Posted February 10, 2003 Share Posted February 10, 2003 First of all an engine capacity would be required... 1600 or 1800 *serious* head porting, big inlets BP285H or 1337 cams Matched plenum Decent exhaust Emerald Verniers That should give you around 165-170 on a 1.8, maybe more if everything is spot on. Oily Link to comment Share on other sites More sharing options...
robmar Posted February 10, 2003 Share Posted February 10, 2003 when you say "matched plenum" what do you mean, I ma guessing that it is measured to the inlet holes so as to have no step and or as smooth as possible finish? big inlets I am asusming you mean inlet valves as for internals I am gussing that you will never get enough air to to get loads of revs so the engine will not require uprated internals? rob Link to comment Share on other sites More sharing options...
oilyhands Posted February 10, 2003 Share Posted February 10, 2003 Yes, yes and yes Oily Link to comment Share on other sites More sharing options...
Alex Birtwisle Posted February 10, 2003 Share Posted February 10, 2003 slightly o/t ......... but .......... is there much you can do to the standard plastic plenum by way of smoothing the airflow to improve it's performance? Alex S713UMY 1.8K Viper Blue and Black Edited by - abirtwisle on 10 Feb 2003 17:19:12 Link to comment Share on other sites More sharing options...
robmar Posted February 10, 2003 Share Posted February 10, 2003 from my understadning they can be unfifnished inside with lots of flash 🤔 which can be removed with a file I have never taken mine off, but may do before it gets an emerald and a proper mapping to check I haven't got any ... rob Link to comment Share on other sites More sharing options...
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