onehotminute_191 Posted May 22, 2008 Share Posted May 22, 2008 i done the cams, maf sensor, ecu, throttle body. got it all running and the timing was too slack so i would have no power, then loads, etc. i re-timed the engine when i swapped it into the new car and its 100times better, but my question is, i seem to hit a power band at 4000rpm. its that normal as there 2 litre cams which are a different profile and cams normally change where the power comes in. it'll drive normally at low revs nothing impressive then hit 4000 and theres a considerable amount of extra power (compared to low revs, i know its only an escort lol) just curious. it all works fine though, few consumption seem normal, engine temp is ok. anyone else who done this conversion had the same experience? oh also not sure if it makes alot of difference but the head has been ported and polished. and i just put on a 4-2-1 manifold and sports cat but the exhuast was only done the other day, it still drives as i just explained before and after doing that. cheers Link to comment Share on other sites More sharing options...
cherrybeard Posted May 22, 2008 Share Posted May 22, 2008 i done the cams, maf sensor, ecu, throttle body. got it all running and the timing was too slack so i would have no power, then loads, etc. i re-timed the engine when i swapped it into the new car and its 100times better, but my question is, i seem to hit a power band at 4000rpm. its that normal as there 2 litre cams which are a different profile and cams normally change where the power comes in. it'll drive normally at low revs nothing impressive then hit 4000 and theres a considerable amount of extra power (compared to low revs, i know its only an escort lol) just curious. it all works fine though, few consumption seem normal, engine temp is ok. anyone else who done this conversion had the same experience? oh also not sure if it makes alot of difference but the head has been ported and polished. and i just put on a 4-2-1 manifold and sports cat but the exhuast was only done the other day, it still drives as i just explained before and after doing that. cheers how did you come to the conclusion that the head needed porting/polishing? i thought that you still need to retain some turbulence of the incoming mixture for an even combustion? im only learning though, so let me know how it came about! Link to comment Share on other sites More sharing options...
onehotminute_191 Posted May 22, 2008 Author Share Posted May 22, 2008 i got the head off ebay for £50 with a pair of 2ltire profiled kent cams so thought it was a good deal. with the porting and polishing, its just really to open out the ports and make a smoother flow for the mixture to pass, it gets rid of sharp edges and things that cause a disruption in the flow, because better flow generally means more torque. the exhuast is more ported than the intake as it came off a turbo'd zetec. when you start talking about turbulance in the flow then the conversation is gonna get way out of hand lol. i cant really remember the details of it all but someone here might if they want to go into details. theres so many different things to consider and think about. Link to comment Share on other sites More sharing options...
cherrybeard Posted May 22, 2008 Share Posted May 22, 2008 i can understand that the exhaust ports would benefit from being more free flowing. Ive only skimmed over the chapter on swirl and tumble but as i understand it, turbulence, although its a energy robbing process, can introduce a more evenly mixed air/fuel mixture so that the combustion process can perform more efficiently. Like i said though, im still coming to terms with all this and dont fully understand it yet. Someone more experienced will come along soon to tell us whats what hopefully. Link to comment Share on other sites More sharing options...
Stu Posted May 22, 2008 Share Posted May 22, 2008 Welcome to why I tell people the 130PS engine is crap. Link to comment Share on other sites More sharing options...
onehotminute_191 Posted May 22, 2008 Author Share Posted May 22, 2008 Welcome to why I tell people the 130PS engine is crap. yeah i see your point stu. if you drive at the red line all the time its ok but low down theres probably less power than standard gti spec. i only done it to have a go. id get bored otherwise. but are you saying the whole thing is crap? or is it the cams? or the management? Link to comment Share on other sites More sharing options...
Stu Posted May 22, 2008 Share Posted May 22, 2008 It's a spec created by the marketing dept at Ford. It's a numbers game. As Clarkson says, MOAR POWAHH!! Link to comment Share on other sites More sharing options...
onehotminute_191 Posted May 22, 2008 Author Share Posted May 22, 2008 It's a spec created by the marketing dept at Ford. It's a numbers game. As Clarkson says, MOAR POWAHH!! so i take it your advice on that is not to use that spec lol. i was thinking about a 2 litre conversion. hmm. and there was me thinking ill leave the major car stuff for a while Link to comment Share on other sites More sharing options...
nick_ov_uk Posted May 22, 2008 Share Posted May 22, 2008 the 2 liter is the same, im pretty bored of mine now. ive found out that 16v cars are top end while 8v cars seem to be low down power. Link to comment Share on other sites More sharing options...
onehotminute_191 Posted May 22, 2008 Author Share Posted May 22, 2008 the 2 liter is the same, im pretty bored of mine now. ive found out that 16v cars are top end while 8v cars seem to be low down power. it must be the cams then. oh well. ill live with it until i get a different car i suppose Link to comment Share on other sites More sharing options...
Stu Posted May 22, 2008 Share Posted May 22, 2008 Nick, you're right.. the 8v engines do have better low-end torque... with regards to the 16v engines, now you can see why I recommend against putting silly cams in them! You just lose everywhere! Link to comment Share on other sites More sharing options...
onehotminute_191 Posted May 22, 2008 Author Share Posted May 22, 2008 Nick, you're right.. the 8v engines do have better low-end torque... with regards to the 16v engines, now you can see why I recommend against putting silly cams in them! You just lose everywhere! but how does the cam profile make that much difference on where the power is obtained? its still opening and closing the valves at the same time throughtout the rev range so why would you get more power at top end? Link to comment Share on other sites More sharing options...
1pukkadeal Posted May 22, 2008 Share Posted May 22, 2008 one day people will listen stu rather than wasting time and money for zero benefits Link to comment Share on other sites More sharing options...
Stu Posted May 22, 2008 Share Posted May 22, 2008 one day people will listen stu rather than wasting time and money for zero benefits Actually i'd rather people go and do their own testing, it's the best way to learn (although it helps if you understand what you're testing and how to interpret the results). Listening to what I say is no better than any other goon on the internet. Link to comment Share on other sites More sharing options...
1pukkadeal Posted May 22, 2008 Share Posted May 22, 2008 (edited) Actually i'd rather people go and do their own testing, it's the best way to learn (although it helps if you understand what you're testing and how to interpret the results). Listening to what I say is no better than any other goon on the internet. Anyone that uses this site enough see's this question posted every week if not more as well you know , and its always the same answer from anyone in the know or someone thats done it before ,think the search button needs to be in bold font I guess Edited May 22, 2008 by 1pukkadeal Link to comment Share on other sites More sharing options...
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