RE: Gearing an F2

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RE: Gearing an F2

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RE: Gearing an F2 - 5/3/2007 8:11:42 PM

lee1rbc

Posts: 98
Joined: 3/22/2007
Status: offline

If I was trying to get the best top end out of my CBR I would go with a 40 tooth rear and 15 front with a 520 chain. That would put me at peak H.P. 11,500rpms at 152mph. Also a 40 tooth sprocket will free up a little H.P. being that its smaller with a shorter chain...

_____________________________

1994 CBR F2 Stage 1 jet, Yosh exhaust, fiberglass body.
2006 ZX6R 636 green.

(in reply to lee1rbc)

Post #: 16

RE: Gearing an F2 - 5/11/2007 1:31:02 AM

pappaj

Posts: 4
Joined: 5/11/2007
Status: offline

that would make the top end faster on your bike but you would loose alot of torque so you would need to find a longer road to get to your new top speed and if you are worried about the little bit of weight you would save by having a smaller chain and sprocket take a crap before you ride.

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Post #: 17

RE: Gearing an F2 - 5/11/2007 8:54:10 AM

lee1rbc

Posts: 98
Joined: 3/22/2007
Status: offline

Actually there have been many dyno tests that have shown that going from a 530 chain to a 520 chain (2lbs lighter) gains about 1.5 to 2h.p. and around 3 to 4 h.p. in the mid rpms.

_____________________________

1994 CBR F2 Stage 1 jet, Yosh exhaust, fiberglass body.
2006 ZX6R 636 green.

(in reply to pappaj)

Post #: 18

RE: Gearing an F2 - 5/11/2007 12:14:44 PM

jbreit

Posts: 306
Joined: 10/13/2006
Status: offline

quote:

ORIGINAL: lee1rbc

Here is a link that I like to mess with. It calculates the rear wheel H.P. needed to achieve a set M.P.H.
Honda CBR F2
Coefficient of Drag (Cd):.600
Frontal area (sq. ft.):5.98
wet weight of bike 440lbs + rider

http://www.rbracing-rsr.com/aerohpcalc.html

F2 produces peak h.p.(around 84) from 10,500rpms to 11,000rpms, so to achieve the best top speed You want to be at 11,000rpms at top end.

I am glad to see someone else say this....I've had the argument a number of times....peak speed is all about HP peak. But the fact is that if you are pulling to redline in top gear, your bike can be geared to go faster, as power peak is usually 1000-1500 rpm before redline.

It all depends on your needs. Drag racers care about making the most of each shift...som believ in using all 6 speeds. I've read books where the author insists you gear for the faster part of the track. For road racing, I disagree...you spend so little time at top speed, that if it comes at a penalty of fumbling with gears in tighter/slower parts of the track thats counter productive.

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Post #: 19

RE: Gearing an F2 - 5/11/2007 4:03:40 PM

lee1rbc

Posts: 98
Joined: 3/22/2007
Status: offline

Good points. Drag racing is all about the take off and 60ft times. Alot of that is mastering the clutch, but a quicker gear is going to get You out of the hole faster. Too tall of a gear and You can't keep the front end down, too long and You'll either bog or burn Your clutch out. Because I lowered my F2 2 inches when I launch it hard instead of coming up it spins the rear tire, (I think I need better rubber.)

_____________________________

1994 CBR F2 Stage 1 jet, Yosh exhaust, fiberglass body.
2006 ZX6R 636 green.

(in reply to jbreit)

Post #: 20

RE: Gearing an F2 - 5/11/2007 4:37:59 PM

bindelsf2

Posts: 1331
Joined: 5/7/2006
From: YES THAT IS A 900 ENGINE IN A F2 ON SPRAY
Status: offline

yep i agree!

i am lowered 3 and still lift the front about a foot off the tree .. get a Shinko and a really good burn out!!

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nitrous is like a slut, you wanna hit it but are scared of the consequences!

honda CBR 600F2/900RR
-93 900RR ENGINE (893cc)
10" stretch
-NOS
-D&D race series exhaust
-Stage 7 jet kit and single filters
-98 F3 tail
-pingel rear strut

(in reply to lee1rbc)

Post #: 21