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Youngy
Forums Junkie


Location:
Eskilstuna, Sweden
Registered:
May 2002
Re: Cost of porting&polishing and other engine work? Sun, 08 September 2002 18:39 Go to previous messageGo to previous message
Thanks for the info mrshin.

I used to spend a lot of time with 2-stroke MX bikes. Even a mild port and polish would make a noticeable difference in the power curve.

There would be guys (sponsored of course) that would have engines ported and polished for the indoors and different ones for the outdoors. Porting and polishing helped to get more power and also change or modify how and when that power was delivered in the power band, or rather when the motor came on the pipe.

Sure there is bound to be some very precise fluid dynamics based explanation for this one, which escapes me without doing further research (I do know that rifling in a gun barrel is to put a spin on the bullet so it goes straighter for longer). But I also know that porting and polishing helps motors breath better and hence go better.

The golfball analogy does have merit: http://www.howstuffworks.com/question37.htm

[Updated on: Sun, 08 September 2002 19:12]

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SubjectPosterDate
Read Message   Cost of porting&polishing and other engine work? StefanTue, 03 September 2002 13:40
Read Message   Re: Cost of porting&polishing and other engine work? raSkaSTue, 03 September 2002 15:19
Read Message   Re: Cost of porting&polishing and other engine work? mr supraWed, 04 September 2002 06:27
Read Message   Re: Cost of porting&polishing and other engine work? raSkaSWed, 04 September 2002 16:22
Read Message   Re: Cost of porting&polishing and other engine work? BigBadBennyWed, 04 September 2002 21:10
Read Message   Re: Cost of porting&polishing and other engine work? GIN51EThu, 05 September 2002 04:32
Read Message   Re: Cost of porting&polishing and other engine work? Celica_RA40Wed, 04 September 2002 11:08
Read Message   Re: Cost of porting&polishing and other engine work? M.W.P.Thu, 05 September 2002 08:16
Read Message   Re: Cost of porting&polishing and other engine work? NorbieThu, 05 September 2002 08:32
Read Message   Re: Cost of porting&polishing and other engine work? Celica_RA40Thu, 05 September 2002 12:16
Read Message   Re: Cost of porting&polishing and other engine work? TE72_TurboThu, 05 September 2002 12:41
Read Message   Re: Cost of porting&polishing and other engine work? GasedThu, 05 September 2002 13:04
Read Message   Re: Cost of porting&polishing and other engine work? StefanThu, 05 September 2002 13:16
Read Message   Re: Cost of porting&polishing and other engine work? NorbieThu, 05 September 2002 23:39
Read Message   Re: Cost of porting&polishing and other engine work? gianttomatoFri, 06 September 2002 01:20
Read Message   Re: Cost of porting&polishing and other engine work? YoungyFri, 06 September 2002 02:33
Read Message   Re: Cost of porting&polishing and other engine work? NorbieFri, 06 September 2002 03:35
Read Message   Re: Cost of porting&polishing and other engine work? purpleminiepSat, 07 September 2002 14:11
Read Message   Re: Cost of porting&polishing and other engine work? mrshinSat, 07 September 2002 14:18
Read Message   Re: Cost of porting&polishing and other engine work? Bill SherwoodSun, 08 September 2002 01:23
Read Message   Re: Cost of porting&polishing and other engine work? celicamad85Sun, 08 September 2002 03:34
Read Message   Re: Cost of porting&polishing and other engine work? GIN51ESun, 08 September 2002 04:30
Read Message   Re: Cost of porting&polishing and other engine work? Bill SherwoodSun, 08 September 2002 06:36
Read Message   Re: Cost of porting&polishing and other engine work? TE72_TurboSun, 08 September 2002 09:24
Read Message   Re: Cost of porting&polishing and other engine work? SamSun, 08 September 2002 09:36
Read Message   Re: Cost of porting&polishing and other engine work? GIN51ESun, 08 September 2002 10:43
Read Message   Re: Cost of porting&polishing and other engine work? celicamad85Sun, 08 September 2002 10:43
Read Message   Re: Cost of porting&polishing and other engine work? Bill SherwoodSun, 08 September 2002 10:47
Read Message   Re: Cost of porting&polishing and other engine work? celicamad85Sun, 08 September 2002 11:00
Read Message   Re: Cost of porting&polishing and other engine work? Celica_RA40Sun, 08 September 2002 13:12
Read Message   Re: Cost of porting&polishing and other engine work? allencrSun, 08 September 2002 13:38
Read Message   Re: Cost of porting&polishing and other engine work?  YoungySun, 08 September 2002 18:39
Read Message   Re: Cost of porting&polishing and other engine work? mrshinSun, 08 September 2002 22:25
Read Message   Re: Cost of porting&polishing and other engine work? thetoyman75Tue, 10 September 2002 04:22
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