SuzukiSavage.com - Exhaust design (open pipe)

klx650sm2002

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Exhaust design (open pipe)
01/27/05 at 07:56:51

RPM vs. length

3000 = 78"
3500 = 67"
4000 = 59"
4500 = 52"
5000 = 47"
5500 = 43"
6000 = 39"
6500 = 36"

Where lengths are too long to fit half them, only if you have to.

I've been measuring my std. carb (40mm CV) and if you take the area of the butterfly spindle off the carb area you will have the equivalent area of a 37mm slide carb (my formula is based on slide carbs).
So all you guys with std. carbs should use a 38mm (1.5") i.d. header with the lengths shown above for what revs you want + 32mm (1.25").

Clive W Cheesy

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klx650sm2002 Serious Thumper Offline The more I learn the less I know. Posts: 2041 Cumbria,England Gender:	Re: Exhaust design (open pipe) Reply #1 - 02/03/05 at 07:21:24 I know this is of limited interest to most of you but if anybody has any questions about their exhaust I'll do my best to answer. Clive W
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Mr 650

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Re: Exhaust design (open pipe)
Reply #2 - 02/04/05 at 00:02:04

Not at all … thanks!
There is no mention of diameter so resonance is the only function of this good old straight pipe?
While cruising in the pits, most headers seen now use a two or three step primary pipe w/ increasing diameter to prevent reversion. Then, most use a megaphone w/ a 2nd taper or reverse cone at the end.
How do they calculate all that stuff? ???
I remember reading an article on 2-stroke expansion chambers that seemed to explain some of this.

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SilverBlue '01,K&N,Snorklectomy,125mm NOS carb, 1/2 spacer & 155, 'Trapp, NC flyscreen, Suzy GelSeat, Osram H4
later..putt. Putt, PUtt, PUTT! 8)
HelmetLawsSuck

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klx650sm2002

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Re: Exhaust design (open pipe)
Reply #3 - 02/04/05 at 07:44:18

I've been designing pipes for a pro race team + customers for more than 10 years.
I've done pipes for 1,2 and 4 cyl two and four stroke.
I don't want to divulge my formulas, but would like to help those thinking of having a pipe made.

The thing I think should be kept in mind is that the Savage is a road 'bike in a low state of tune, not a race 'bike.

I do state an i.d. based on carb size and tube available (if you can find a tube with 37mm i.d. there would be no need to add the 32mm to the overall length).

When I'm designing a race pipe I use tapers in the headers and steps in the tailpipe (mostly fours)

With it's tame cams and a small bore pipe there is no reversion worth talking about.

A reverse cone mega is a V good race pipe but disastrous as a road pipe where it's sharply defined powerband and poor running both above and especially below the powerband make it very difficult to live with.

Thanks for your time

Clive W Cheesy

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Mr 650 Serious Thumper Offline The LS650- Classic style & 4-valve engine Posts: 1389 Mempho Gender:	Re: Exhaust design (open pipe) Reply #4 - 02/05/05 at 00:16:33 Cool, across the pond "Savage" racing would not be a living. What sort of racin' would that be?
Back to top	SilverBlue '01,K&N,Snorklectomy,125mm NOS carb, 1/2 spacer & 155, 'Trapp, NC flyscreen, Suzy GelSeat, Osram H4 later..putt. Putt, PUtt, PUTT! 8) HelmetLawsSuck IP Logged

klx650sm2002 Serious Thumper Offline The more I learn the less I know. Posts: 2041 Cumbria,England Gender:	Re: Exhaust design (open pipe) Reply #5 - 02/05/05 at 00:49:29 Sidecar F1 + F2 and classic solos mostly. Like drag racing. Clive W
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Mr 650 Serious Thumper Offline The LS650- Classic style & 4-valve engine Posts: 1389 Mempho Gender:	Re: Exhaust design (open pipe) Reply #6 - 02/05/05 at 00:55:48 ...like with the "monkeys!? "
Back to top	SilverBlue '01,K&N,Snorklectomy,125mm NOS carb, 1/2 spacer & 155, 'Trapp, NC flyscreen, Suzy GelSeat, Osram H4 later..putt. Putt, PUtt, PUTT! 8) HelmetLawsSuck IP Logged

klx650sm2002 Serious Thumper Offline The more I learn the less I know. Posts: 2041 Cumbria,England Gender:	Re: Exhaust design (open pipe) Reply #7 - 02/05/05 at 00:59:52 You wouldn't call a turbo 'Busa a road bike in a low state of tune. Clive W
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klx650sm2002 Serious Thumper Offline The more I learn the less I know. Posts: 2041 Cumbria,England Gender:	Re: Exhaust design (open pipe) Reply #8 - 02/05/05 at 01:04:21 Yes monkeys is one term for them. Clive W
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Mr 650 Serious Thumper Offline The LS650- Classic style & 4-valve engine Posts: 1389 Mempho Gender:	Re: Exhaust design (open pipe) Reply #9 - 02/05/05 at 01:08:24 I have only seen side car racing on video. Looks like fun. There twould'nt be any drinkin afterwards amongst monkeys and drivers would there be?!
Back to top	SilverBlue '01,K&N,Snorklectomy,125mm NOS carb, 1/2 spacer & 155, 'Trapp, NC flyscreen, Suzy GelSeat, Osram H4 later..putt. Putt, PUtt, PUTT! 8) HelmetLawsSuck IP Logged

klx650sm2002 Serious Thumper Offline The more I learn the less I know. Posts: 2041 Cumbria,England Gender:	Re: Exhaust design (open pipe) Reply #10 - 02/05/05 at 01:16:21 There are "drinking teams" but ours isn't one of them. the team boss builds sidecar chassis for a living, he's building an F1 (long 'bike 1000cc) and is racing an F2 (short 'bike 600cc) we are just over 200bhp/liter with the F2 and more to come. Clive W
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klx650sm2002 Serious Thumper Offline The more I learn the less I know. Posts: 2041 Cumbria,England Gender:	Re: Exhaust design (open pipe) Reply #11 - 02/05/05 at 01:26:17 I'll bet Your drag racer puts out a darned site more than 200bhp/liter. Clive W
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Mr 650 Serious Thumper Offline The LS650- Classic style & 4-valve engine Posts: 1389 Mempho Gender:	Re: Exhaust design (open pipe) Reply #12 - 02/05/05 at 01:30:07 What qualities make a good "monkey"?
Back to top	SilverBlue '01,K&N,Snorklectomy,125mm NOS carb, 1/2 spacer & 155, 'Trapp, NC flyscreen, Suzy GelSeat, Osram H4 later..putt. Putt, PUtt, PUTT! 8) HelmetLawsSuck IP Logged

klx650sm2002 Serious Thumper Offline The more I learn the less I know. Posts: 2041 Cumbria,England Gender:	Re: Exhaust design (open pipe) Reply #13 - 02/05/05 at 01:38:02 Light weight 130 to 150 lbs athletic and not easily scared. Tony (the boss) has a daughter who passengers for another team and she's good. The passenger can steer the 'bike quite a lot. Clive W
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Mr 650

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Re: Exhaust design (open pipe)
Reply #14 - 02/05/05 at 02:05:39

klx650sm2002 wrote on 12/31/69 at 16:00:02:

I'll bet Your drag racer puts out a darned site more than 200bhp/liter.

Clive W Cheesy

I dunno 200/l is good, when you put it that way.
It's in the wee hours here and we are a drinking team and the team was out during the off season tonight!
I would fiddle w/ the calculator but the marguaritas are taking effect now, so I leave it to you. Tongue

1350hp/532 c.i. (would just as soon break something as go straight).
Motor is not state of the art but competitive.
Have a new set of carbs to set up yet.
The big Dominators were not compatable w/ current running gear.

cheers

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SilverBlue '01,K&N,Snorklectomy,125mm NOS carb, 1/2 spacer & 155, 'Trapp, NC flyscreen, Suzy GelSeat, Osram H4
later..putt. Putt, PUtt, PUTT! 8)
HelmetLawsSuck

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