cookci Posted March 10, 2007 Share Posted March 10, 2007 is there any mod actually worth doing whilst the head is off? more BHP would be nice Link to comment Share on other sites More sharing options...
mikeyb10supra Posted March 10, 2007 Share Posted March 10, 2007 there is a hell of a lot although it all takes many man hours + a big bank balance!! the key to developing 100% peak power potential is flow bench testing you could maybe try raising the intake ports, narrowing the valve guide boss, shortening the amont of guide that protrudes into the port, smoothing and blending the bowl area under the seats, installing larger intake valves or valves with undercut stems just above the valve head and/or swirl polished heads, if your going to use it at higer revs, stiffer valve prings are a must as well. Turbofit will do a lot of this for you if you get in contact with them although I imagine it will be pricey.....speak to JamieP I think he has had a lot of head work done....ooo err Link to comment Share on other sites More sharing options...
cookci Posted March 10, 2007 Author Share Posted March 10, 2007 that sounds very complicated! I was hoping to ask the "engine specialist" thats got it in bits at the moment to do some work but he might not be specialist enough Link to comment Share on other sites More sharing options...
mikeyb10supra Posted March 10, 2007 Share Posted March 10, 2007 that sounds very complicated! I was hoping to ask the "engine specialist" thats got it in bits at the moment to do some work but he might not be specialist enough im sure he can port and polish/gas flow the head for you, how much are you looking to spend on dooing this as it can get very very expensive Link to comment Share on other sites More sharing options...
cookci Posted March 10, 2007 Author Share Posted March 10, 2007 no idea to be honest i thought it might be reasonable as its already in bits excust my ignorance Link to comment Share on other sites More sharing options...
paul mac Posted March 10, 2007 Share Posted March 10, 2007 can get very expensive mate for not much gain to be honest, i have quite a bit of experience porting 2 strokes so got a 4 stroke tuning book (A.Graham-Bell) and did the head myself at night after work...........it took me 2 weeks Link to comment Share on other sites More sharing options...
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