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Benzine
50cc nipper
Joined: 06 Feb 2006
Posts: 23
Location: Sydney NSW
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 Posted: Sun Feb 12, 2006 9:12 pm Post subject: YFZ450 dyno run + A/F ratio |
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Had my YFZ on a chassis dyno a few months ago. It was showing an air/fuel ratio of 17/1 at full song/max revs. I know this is extremly lean for a normally aspirated car engine but does anybody know what it should be for a bike.
BTW..It made 29.6hp at the wheels
Kevin
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Sponsor
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ATV PRO
Roostin Away
Joined: 13 Feb 2006
Posts: 888
Location: Central Coast, NSW
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| Posted: Mon Feb 13, 2006 8:22 pm Post subject: |
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14.7 to 15
_________________
Cheers
Len
ATV PRO Pty Ltd |
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Process West
90cc 2 stroke / 110 4 stroke
Joined: 08 Feb 2006
Posts: 67
Location: Wollongong,NSW
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| Posted: Wed Feb 15, 2006 9:39 pm Post subject: |
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Thanks for that...the bike did a big end not long after....it was probably pinging causing the big end to fail
Kevin
_________________
Kevin Westblade
www.processwest.com.au
Aluminium Engineering |
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Hudson
4fiddy Racer
Joined: 12 Feb 2006
Posts: 287
Location: This Week... Back in Texas
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| Posted: Fri Feb 17, 2006 9:35 pm Post subject: |
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| Had my bike on a dyno a few times and the tuner wanted between 13 and 14. With 19 inch tyres (because tyre size made huge differences to hp figures) my bike made 51.3 hp. Has a ported head, full exhaust, air filter and cam mod otherwise the bike is standard. On premium unleaded also |
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tzkev
90cc 2 stroke / 110 4 stroke
Joined: 17 Feb 2006
Posts: 93
Location: Newcastle
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| Posted: Mon Feb 20, 2006 9:30 pm Post subject: |
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| It is my understanding that a four stroke engine while under load makes best power between 12.5 -13.5 a/f. Dont quote me on this but i also thought tyre size really on made major changes in torgue readings on a dyno, eg 1 st gear would read better/higher than say 4 gear on a dyno, though i could be wrong on both torque and a/f ratio. |
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Hudson
4fiddy Racer
Joined: 12 Feb 2006
Posts: 287
Location: This Week... Back in Texas
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| Posted: Thu Feb 23, 2006 9:31 pm Post subject: |
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| A/F is good to go but we found tyre size alone could make a difference of around 6hp. That was going from a 18in tyre to a 22in tyre |
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HoleshotQR#24
Big Bore, Stroked & Bling +
Joined: 01 Apr 2006
Posts: 404
Location: South Australia
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Process West
90cc 2 stroke / 110 4 stroke
Joined: 08 Feb 2006
Posts: 67
Location: Wollongong,NSW
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| Posted: Mon Apr 24, 2006 9:23 pm Post subject: Re: suzuki ltr450 dyno run |
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I still havent had a chance to put my LTR on the dyno...
DynoJet dynos do read high...in the car world they are known as "Disney Dynos"
Kevin
_________________
Kevin Westblade
www.processwest.com.au
Aluminium Engineering |
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