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ed_ma61
Forums Junkie

Location:
Lost in the K hole
Registered:
May 2002

my porting job - comments ??	Thu, 07 November 2002 11:42

check out: http://www4.tpgi.com.au/users/loats/technical/engi nes/7mgeheadport.html to have a look at my first crack at porting. any CONSTRUCTIVE observations, comments, or tips for improvement would be greatly appreciated. thanks ed [Report message to a moderator]

Location:
Townsville NQ
Registered:
September 2002

Re: my porting job - comments ??	Thu, 07 November 2002 12:54

not bad , but i would of spent more time on the shoulder than polishing though. i don't polish mine any where that much, i like to decease any angles that air need to flow around, but it looks good. [Report message to a moderator]

ed_ma61
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Lost in the K hole
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May 2002

Re: my porting job - comments ??	Thu, 07 November 2002 13:11

which shoulder are you specifically referring to? the short side radius? i was under the impression that it was best to leave as much material there as possible, and simply radius it as best as possible, making a nice smooth curve with blended transitions... any specific suggestions as to what i could improve where, and why? cheers ed [Updated on: Thu, 07 November 2002 13:16] [Report message to a moderator]

gianttomato
Forums Junkie

I supported Toymods

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I renounced punctuation
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May 2002

Re: my porting job - comments ??	Thu, 07 November 2002 22:54

Looks like a good blend, I like the valve guide area, exhaust ports are good. Now you really must get comparison flows. [Report message to a moderator]

SupraPete
Forums Junkie

Location:
Sydney
Registered:
July 2002

Re: my porting job - comments ??	Fri, 08 November 2002 02:59

Hey ed, Looks great. Although I'm not an expert. I'm gonna ask for a dremel for chrismas now. How hard is it to do a port job? How long does it take? Could I do it? [Report message to a moderator]

ddeane
Regular

Location:
PNG
Registered:
June 2002

Re: my porting job - comments ??	Fri, 08 November 2002 03:47

Ed Looks great! Don't mind if you make a mistake in the head u are sending me. Craig [Report message to a moderator]

ed_ma61
Forums Junkie

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Lost in the K hole
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May 2002

Re: my porting job - comments ??	Fri, 08 November 2002 13:33

craig, no fear of a mix up im afriad... check your PM's, im just about to drop you a line about the head... pete: yeah, you can do it, takes freaking FOREVER, and i probably dont recommend doing much more than a stage 1 port, ie clean up casting dags and smooth all the corners. once you start getting adventurous, and try to do an actual flow character change, youre heading off into no-mans-land as a first timer. that said, for stock cams and mild engine work, a stage 1 port will make all the difference you want. more would be wasted. im going to put up a HEAP of tech info on porting theory and technique, have a read when its up cheers ed [Report message to a moderator]

skitz_supra
Occasional Poster

Location:
North Brisbane
Registered:
May 2002

Re: my porting job - comments ??	Sat, 09 November 2002 08:50

if u want another 7m-gte head to "practise" on, i have a spare one floating around somewhere [Report message to a moderator]

5KinKP60
Regular

Location:
Finland
Registered:
June 2002

Re: my porting job - comments ??	Sat, 09 November 2002 23:52

Head porting is a black art. Gone are the days when flow figures are solely inspected at max valve lift. That has been found to be quite misleading. Porting each head canal in such manner that we have a fistful of aluminium crumbs on the floor will yield power. No doubt about that. Since engines are not constant velocity inventions, head canal should support/assist flow with mediocre rpm's. This is where pro's know-how steps in. I really enjoy doing things by myself. I however respect professions (and professionals) that have been in a business for a long time, and being involved with something as complicated as fluid/gas flow mechanics. There is more than meets the eye. That's why I'll go the lenght to have a pro do my head. Nothing wrong in doing the 'stage 1' job DIY way. Smoothing casting nicks and so forth - cannot go wrong with that. God speed and happy motortuning to all -A. [Updated on: Sat, 09 November 2002 23:55] [Report message to a moderator]

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