c0c4in3 Posted February 9, 2006 Share Posted February 9, 2006 what does this mean? Thanks, Oliver Link to comment Share on other sites More sharing options...
SupraHuman Posted February 9, 2006 Share Posted February 9, 2006 It means that the ports that your manifold hooks up to have been smoothed out/filed/grinded for better flow and performance Link to comment Share on other sites More sharing options...
Jake Posted February 9, 2006 Share Posted February 9, 2006 It means the intake and exhaust passages are opened up a little, cleaned up/smoothed for increased gas flow Link to comment Share on other sites More sharing options...
Jake Posted February 9, 2006 Share Posted February 9, 2006 Stolen from SupraForums.com : Intake port gasket matching before http://memimage.cardomain.net/member_images/10/web/694000-694999/694969_81_full.jpg Intake port gasket matching after http://memimage.cardomain.net/member_images/10/web/694000-694999/694969_97_full.jpg Link to comment Share on other sites More sharing options...
c0c4in3 Posted February 10, 2006 Author Share Posted February 10, 2006 Thanks a lot... I thought ported means something like changing the position of the engine Sorry for beeing dumb... But porting for me means moving something from here to there... But thanks a lot for your replies... Appreciate that. Have a good weekend mates :-) Oliver Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 10, 2006 Share Posted February 10, 2006 In a way your take is correct, after porting atmosphere or boost moves the fuel / air mix from the filter to the combustion chamber more efficiently, and with better mixing. Link to comment Share on other sites More sharing options...
c0c4in3 Posted February 10, 2006 Author Share Posted February 10, 2006 Thanks Chris, When you come the next time to Germany? Only hear good things about you... ;-) Link to comment Share on other sites More sharing options...
Lucifer Posted February 11, 2006 Share Posted February 11, 2006 If anyone is iterested in this, I now have agood contact for porting. £700 a 6pot head for a good street port. The guy does alot of work for Anderson Race engines, and been doing it for a long long time, so Im guessing his work is as good as other people if not better. Link to comment Share on other sites More sharing options...
c0c4in3 Posted February 11, 2006 Author Share Posted February 11, 2006 will this increase power and perfermance? Link to comment Share on other sites More sharing options...
JohnA Posted February 11, 2006 Share Posted February 11, 2006 not related to this then http://www.max-boost.co.uk/stuff/portishead_portishead.jpg Link to comment Share on other sites More sharing options...
Ian C Posted February 11, 2006 Share Posted February 11, 2006 will this increase power and perfermance? In a forced induction engine.... not really -Ian Link to comment Share on other sites More sharing options...
Lewis Posted February 11, 2006 Share Posted February 11, 2006 and in an NA? Link to comment Share on other sites More sharing options...
Ian C Posted February 11, 2006 Share Posted February 11, 2006 Not a lot Not these days. The MkIV cylinder head is reknown for being really good out of the factory. The old ford xflows responded well to porting and polishing because they were shit to begin with haha. Hence this job has a reputation for getting good power gains, but in reality not much is to be done with modern heads. -Ian Link to comment Share on other sites More sharing options...
Lewis Posted February 11, 2006 Share Posted February 11, 2006 Figured, cheers Ian Link to comment Share on other sites More sharing options...
JohnA Posted February 11, 2006 Share Posted February 11, 2006 If the job is done by a pro, then you'll probably see the same power figures, nicely distributed through the revs, at a couple of psi less. It's the "icing on the cake" so to speak Link to comment Share on other sites More sharing options...
Jake Posted February 12, 2006 Share Posted February 12, 2006 It's the "icing on the cake" so to speak and also "the law of dimishing returns". It's a lot of work for very little gain. How many hours would it take somebody to port/polish a TT head? I've done a couple of single cylinder two stroke bike barrels and that took forever. Link to comment Share on other sites More sharing options...
JohnA Posted February 12, 2006 Share Posted February 12, 2006 I, too, used to believe that porting heads for turbos was not worth the effort - mainly because I was relying on other people's knowledge at the time, like Graham Bell's books etc. But when I ported (mildly) my bike's head back in 1989 the difference was quite noticeable and that made me question 'conventional wisdom' That porting job was my first one and it was kinda rough too. The engine was aircooled 2valves/cylinder (ZX750E1) so maybe the starting point was lower - who knows. The truth is that at 10psi it was making around 10 extra bhp and the cyl head temps were lower too (non-intercooled!) On the Calibra I saw the same power at a couple of psi less with a mild porting job (Using a Dremmel, no valve guide grinding or anything spectacular) If I had the supra head off for some reason, I would do a mild porting job on that too. Basically a cleanup, gasket matching and smoothing out of casting marks. Along with valve-lapping surely it can't hurt, and the extra effort involved is not that much anyway. Link to comment Share on other sites More sharing options...
Gazboy Posted February 12, 2006 Share Posted February 12, 2006 One a related note, what does "three angled valve seats" mean? I saw it in an ad for a Tuscan somewhere.... Link to comment Share on other sites More sharing options...
Digsy Posted February 13, 2006 Share Posted February 13, 2006 It means that the profile of the back of the valve head that the air flows over is composed of three different angles rather than just the 45 degree face that the valve actually seats on. Its another airflow thing. Link to comment Share on other sites More sharing options...
JohnA Posted February 13, 2006 Share Posted February 13, 2006 All cyl heads are nowadays 3-angled, at least for 'performance' engines with any pretensions of quality Back on the supra, if going for a full 'porting' job beware of the angles of inlet and exh ports. They are not 'straight' but that is part of the design. I've seen americans trying to 'straighten em up' eliminating the intake swirl unknowingly. Blessem. Link to comment Share on other sites More sharing options...
paul mac Posted February 13, 2006 Share Posted February 13, 2006 If I had the supra head off for some reason, I would do a mild porting job on that too. Basically a cleanup, gasket matching and smoothing out of casting marks. Along with valve-lapping surely it can't hurt, and the extra effort involved is not that much anyway. fully agree with john here, this is exactly what i did with mine when i did the valve seals, matched the ports, not really any casting lines to clean, polished the combustion chambers, valves and exhaust ports but left the intakes the rough cast finish, i have no idea what performance difference it made to the car as it happened with a shit load of other mods, it kept me happy as a pig in shit for a week and was just a far more complex version of the 2 strokes i used to mess with Link to comment Share on other sites More sharing options...
jazz1 Posted February 13, 2006 Share Posted February 13, 2006 nice i want:) Link to comment Share on other sites More sharing options...
Guest Usmann A Posted February 14, 2006 Share Posted February 14, 2006 Porting i think helps when u want to achive a big air mass in and out of the chambers. The supra ports promote swirl on diff chambers, and the port angle will naturally cause some tumbleing of the mixture. Velocity n that doesnt really matter as much, cos we are ovb wafting some air in there, but slight touches of the bowls can be sweet, eventhough its pressureised we can still control how the air is channeled even at high flowrates. When i port supra heads, i do a tidy up of the ports, some heads are brill from the factory, others i seen are mismatched when it comes to gaskets, one off my dads car was a brill head. I always polish the exhausts as i dont want any particles or buildup of carbon deposits,over time it will, but this will slightly delay that. They are other things u can do to therchambers, n if u a big porter make sure u get a burette as u dont want things being uneven. itll all be worth it in the end. Link to comment Share on other sites More sharing options...
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