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porting the intake? (Read 27 times)

klx650sm2002 Serious Thumper Offline The more I learn the less I know. Posts: 2041 Cumbria,England Gender:	Re: porting the intake? Reply #15 - 04/23/07 at 00:58:31 Savage_Greg wrote on 12/31/69 at 16:00:04: Now what did I do with those measurements? Hmmm.. Here they are... Intake = 33 mm or 1.3" Exhaust = 28 mm or 1.1" http://i21.photobucket.com/albums/b277/gmdinusa/HeadChamber_2528.jpg KLX has inlet = 37mm exhaust = 32mm Clive W
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barry68v10 Serious Thumper Offline Posts: 955 Maryland Gender:	Re: porting the intake? Reply #16 - 04/23/07 at 02:17:27 Quote: KLX has inlet = 37mm exhaust = 32mm 100mm bore with bigger head does give you more area to play with...I guess that's one of the reasons for the 13hp difference for stock configuration.
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Savage_Greg Serious Thumper Alliance Member Offline Don't go around your ass to reach your elbow... Posts: 7844 SW Washington State Gender:	Re: porting the intake? Reply #17 - 04/23/07 at 05:18:30 klx650sm2002 wrote on 12/31/69 at 16:00:04: KLX has inlet = 37mm exhaust = 32mm Clive W 5 MM difference between valves in both engines....
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Savage_Greg

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Re: porting the intake?
Reply #18 - 04/23/07 at 05:21:26

Reelthing wrote on 12/31/69 at 16:00:04:

Well there's been classic cases where D ports worked far better than O - the case of the 351 Cleveland factory 4-bbl heads we had ship'd to the US from the Aussies - see ford never sold such a thing in the US. Great big dang valves and ports - turned out the exhaust port was too big for lower rpms if you had the least bit of over lap on the cam - the D port plates made a big difference.

On the intake side much work is done around swirls and such - but also the velocity of the intake mixture - you want it as big as you can get it until the intake velocity slows down - then it's too big - the cam overlap effects it as well - anyone have a flow bench handy?

The velocity will slow down if the intake is larger than the carb throat. Right?

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LANCER Serious Thumper Alliance Member Offline Savage Beast Performance Parts Posts: 10661 Oklahoma Gender:	Re: porting the intake? Reply #19 - 04/23/07 at 06:48:10 klx650sm2002 wrote on 12/31/69 at 16:00:04: KLX has inlet = 37mm exhaust = 32mm Clive W What is the stroke on the KLX?
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Re: porting the intake?
Reply #20 - 04/23/07 at 06:51:59

I believe so - as well as bigger than the valve area needs to keep it high - I have read the magic rate was around 300 ft per second.

The other area was always to back cut the intake valves - go from a tulip shape to a quarter on a stick this opens more valve area sooner - but too much back cut will cause the valve head to pop off.

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Re: porting the intake?
Reply #21 - 04/23/07 at 09:24:44

Not that I do anything with flow dynamics...

I installed a superquiet bathroom exhaust fan recently. At first, I ignored directions and slapped it in with available ducting. (Manual? we don't need no stinking manual!) Huh, louder than the one it replaced! So I read the manual. For optimum performance, it needs 2 to 3' of straight ducting before turning to exit. OK, did that. SOB, it's quiet. I suppose it needs the straight to achieve laminar flow and possibly momentum.

OK, to reduce resistance to the intake you need to reduce surface variation. Micro pockets of vacuum and pressure causes areas of high velocity and low. Read friction. you want gradual change not sudden. HTHS. Grin

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klx650sm2002 Serious Thumper Offline The more I learn the less I know. Posts: 2041 Cumbria,England Gender:	Re: porting the intake? Reply #22 - 04/24/07 at 01:06:51 The bore and stroke on KLX is 100 x 83. Clive W
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Savage_Greg Serious Thumper Alliance Member Offline Don't go around your ass to reach your elbow... Posts: 7844 SW Washington State Gender:	Re: porting the intake? Reply #23 - 04/24/07 at 05:14:10 The bore and stroke on LS is 94 x 94.
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