Eccles Posted July 28, 2016 Share Posted July 28, 2016 Does anyone have details of the cam timings for the 125/140/150 Sigma engines?I'm involved on a thread on Pistonheads about this and was wondering if anyone here has any info to see if I have my 150 set wrongly?Ta muchly - Ivan Link to comment Share on other sites More sharing options...
colindavies56 Posted July 28, 2016 Share Posted July 28, 2016 a guy on pistonheads said 118deg ATDCand 111deg BTDCdont know what thread you've been reading,but this guy has photos,and he seem's genned up to me.pistonhead fella's name is PILOT PRICE.i have no connection with this guy. Link to comment Share on other sites More sharing options...
Eccles Posted July 28, 2016 Author Share Posted July 28, 2016 That's the thread, I'm the other one who's been given values of 110/110 for the 150 cams but wasn't sure if they are the same cams and am trying to find out what others know and set theirs to.He's certainly does and he's getting good power too. Just been trying to figure out if I have been given the original specs and the thinking has changed for these cams to 111/118 or if the cams themselves have changed at some point and is the Supersport cam the same as the 150 cam Maybe I'm just thinking too much! Link to comment Share on other sites More sharing options...
mikecocker Posted July 28, 2016 Share Posted July 28, 2016 I think the cams are the same for the 140 and 150, Piper marked 150 on one end. From my experience, the inlet cam on the 140 is retarded a fair bit, which I think is to do with the long inlet tract. When I tried to advance it to a more normal figure, the engine lost some bhp but gained a little torque. I then upgraded to dthtb and the shorter inlets needed the figure around 110 to develop max bhp. The exhaust did not seem to have so much effect. Both figures could be correct, depending on plenum or throttle bodies. Link to comment Share on other sites More sharing options...
Eccles Posted July 29, 2016 Author Share Posted July 29, 2016 Thanks Mike that's great. Looks like I am OK with my 110 on the inlet as I have the dual throttle bodies. I never realised that you could change cam timing that much without totally upsetting the performance.Did you have your car mapped by the two Steve's, and if you don't mind me asking, what were the power figures after setting up?Ivan Link to comment Share on other sites More sharing options...
punch Posted July 29, 2016 Share Posted July 29, 2016 Yeah, go on Mike, what's the power figures!!!Philip Link to comment Share on other sites More sharing options...
mikecocker Posted July 29, 2016 Share Posted July 29, 2016 I used Northampton Motorsport and can highly recommend them.As to power Philip, it was adequate Link to comment Share on other sites More sharing options...
Eccles Posted July 29, 2016 Author Share Posted July 29, 2016 Link to comment Share on other sites More sharing options...
Tom_Arundel Posted July 29, 2016 Share Posted July 29, 2016 Just upgraded 125 to 140Cams 110 -110 (Piper)Standard Ford plenum with cold air box147 bhp 123 torque on rollers on 95 octaneinjector upgrade required now. Link to comment Share on other sites More sharing options...
Eccles Posted July 31, 2016 Author Share Posted July 31, 2016 Thanks Tom, looks good.Think this thread has just cost me a rolling road session re-map the engine! I've suddenly got the urge to iron out any drivability lumpyness and see what else is at the top end.Thanks allIvan Link to comment Share on other sites More sharing options...
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