Toymods Car Club Inc: Tech & Conversions => Port & Polishing Turbo motor heads?

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oldcorollas
Forums Junkie

Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003

Re: Port & Polishing Turbo motor heads?	Wed, 18 June 2003 04:44

LOL no reflection taken... i definitely agree with you 100%. the reason that porting is called a 'black art' is because most people have no idea what they are doing.. sometimes it works, sometimes it doesn't... ideally you will want your head ported by someone with extensive porting experience in developing your head in particular.. but that's hard to come by sometimes.. the flow bench is also not the best way to determine flow figures, but it's the best way most ppl have access to. the problem is that a port, by it's very nature, has a pulsed flow, so by putting a fixed pressure drop across it, you are nowhere near approximating the actual conditions of an engine. the only real way to get proper flow numbers is by running the head on a motor, or motor test bench, with valves operating, to get numbers that actually mean something.. finally, it also depends a lot on your application.. since auto motors have to be very flexible compared to say plane or boat or drag motors, it's impossible to port for efficiency at all rpm ranges... to get the head to flow well up high can destroy the part throttle characteristics... also some heads are shocking and almost anything you do will help (like the K head exhaust ports, and particularly mazda 1300/1400 heads!!!!) but some i would barely touch.. for another example, i had a look at Juzzos 2TG head, and that thing is awesome from factory. only some minor machining and casting marks to clean up, and removal of a couple of sharp edges.. in general, the newer the head, or the better the original design, the less there is to do on them apart from general clean ups.. and it is vry hard to compare port to port when so many other things on a motor have such an influence... i like porting, because it is fun, and ppl throw away K heads, so it doesn't hurt to practice and try new things , but if a new head is a few $$, then be careful about what you do to it... Cya, Stewart Ps, Rod, you wouldn't have a flowbench at home would you? would be interesting to do some flow data on my head when i pull it off for the EFI.... [Report message to a moderator]

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