lee.spencer Posted October 27, 2002 Share Posted October 27, 2002 I have a Lotus 1558cc Twin Cam (Big Valve) 126bhp engine in my 7, what is the best and most economical way to liberate another 20 bhp? Link to comment Share on other sites More sharing options...
Peter T Posted October 27, 2002 Share Posted October 27, 2002 Strombergs or weber carbed? C7 PWT X-Flow all Steel Link to comment Share on other sites More sharing options...
oilyhands Posted October 27, 2002 Share Posted October 27, 2002 Some better cams and maybe some head work.. Oily Link to comment Share on other sites More sharing options...
Peter T Posted October 27, 2002 Share Posted October 27, 2002 And cetainly forged pistons, unless you allready have them, as a cam change will only extract more power with increased revs.There is no cheap way of gaining another 20 % more power, when the original unit is in a quite highly modified state of tune in the first place. C7 PWT X-Flow all Steel Link to comment Share on other sites More sharing options...
lee.spencer Posted October 27, 2002 Author Share Posted October 27, 2002 I have twin 45 DCOE webbers. Link to comment Share on other sites More sharing options...
cdg Posted October 28, 2002 Share Posted October 28, 2002 I think you have to look at it holistically. There's no easy or cheap way to liberate another 20bhp. I would look to do the following; Re-bore to 85mm (easily acheivable with an L block) with a set of good quality pistons which incorporate deeper valve cutouts. Even bigger valves with head porting to suit. Uprated camshafts- rally spec should work well. Good 4-1 large bore (at least 1 5/8ths" primaries) exhaust system. Should give a reliable 150bhp ish, with more to come should you need it in the future. Chris. Link to comment Share on other sites More sharing options...
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