Quick f3 question

**CHOPPA** · 22nd January 2009, 20:21

Originally Posted by Wingnut

Ok so someone correct me if I'm wrong. But in F3 you can use a V twin cofig. bike with upto 750cc. Correct?

If this is correct - wouldn't a 749 Ducati that has a V2 748cc engine that puts out around 116hp and weights around 175kg, be a good choice to compete with the top level bikes. Have seen a few around on the second hand market..... But ching ching.....

What are these top runners really spending?

I think theres something about valves..?

**Wingnut** · 22nd January 2009, 20:27

Originally Posted by CHOPPA

I think theres something about valves..?

Dead right Mr Chop. Should have kept on reading - engines with 3 or more valves per cylinder are restricted to 650cc.

Well that fucks my theory entirely!

**speights_bud** · 22nd January 2009, 20:29

Originally Posted by quallman1234

SS150 is were its at =).

What he said

**Wingnut** · 22nd January 2009, 20:35

After seeing how big the field for the 150s was at levels, got to consider the street stock 150s for sure. Was good racing to watch too. Till the rain came and then the poor bugger that binned it at the hairpin. Hope he is ok...

But yea anyway - that 150 class is probably the best place to start racing - but at the end of the day - as long as you get out there its all good.

**eelracing** · 22nd January 2009, 20:36

Originally Posted by Wingnut

Ok so someone correct me if I'm wrong. But in F3 you can use a V twin cofig. bike with upto 750cc.

Not 100% sure but as per Choppas answer i think 750 twins can only have two valves per pot,which means using the ducati ss series.

And t3mp0r4ry nzr it is fun but ultimately frustrating...I would like MNZ to introduce a Jnr/Snr type class system to F3 along the lines of Post Classics.
Something along the lines of up to 450cc jnr,up t0 750cc Snr maybe.

**rachprice** · 22nd January 2009, 22:03

Originally Posted by t3mp0r4ry nzr

what has to be done to get 70ish horse?
yeah, could be frustrating having an sv blocking at mid turn point, more risks would need to be taken with inventive lines and aggressive crow-bar moves!.... sounds fun!

O-rings, base gasket and pipes I think

**Billy** · 22nd January 2009, 22:11

[QUOTE=t3mp0r4ry nzr;1902779]what has to be done to get 70ish horse?

On an RGV,Atleast stage 1 ignition (23d10 blackbox)$1000.00,Sagaya pipes around another $1000.00,Tidy up the transfer ports and match the cases too the cylinders,Close the squish up,Mild porting too the exhaust port,power valve modification,Bore the carbs too 35mm,Approximate cost $2500.00 unless you can do it yourself,Kit reedvalves and so on.Add that to your $3000.00 RGV and your no better off than on a stock SV

**slowpoke** · 23rd January 2009, 04:37

Originally Posted by Wingnut

What are these top runners really spending?

It's more about what they know. Knowing how to use what they've got, knowing how best to improve it, knowing how to adapt to different tracks and conditions etc. The machine is only part of the equation and none of our top racers have just rocked up to the F3 shop and bought a winning bike off the shelf, they are all self developed. It's not as simple as just throwing a fistful of cash at a man behind a counter and walking away with a guaranteed winner.

As for how much people are spending, look at it this way: there are a swag of F3 bikes worth a lot more than Sam Loves Pro-Twin that don't get around a track anywhere near as quickly.

**jrandom** · 23rd January 2009, 04:45

Does anyone else find it mildly amusing that on the racetrack, an SV650 is a lardy torque monster, and on the road, it's chickwheels?

**Wingnut** · 23rd January 2009, 06:14

Originally Posted by eelracing

I would like MNZ to introduce a Jnr/Snr type class system to F3 along the lines of Post Classics.
Something along the lines of up to 450cc jnr,up t0 750cc Snr maybe.

Wouldn't think there would be enough in the field to split it up?

**koba** · 23rd January 2009, 06:35

Originally Posted by CHOPPA

I think theres something about valves..?

Yep,
5 stroke Twins
Under 500cc Unlimited except fuel.
650 Max Watercooled 4 Valvers retaining standard airbox setup.
750 Max Aircooled twovalvers

**t3mp0r4ry nzr** · 23rd January 2009, 07:06

[QUOTE=Billy;1903132]

Originally Posted by t3mp0r4ry nzr

what has to be done to get 70ish horse?

On an RGV,Atleast stage 1 ignition (23d10 blackbox)$1000.00,Sagaya pipes around another $1000.00,Tidy up the transfer ports and match the cases too the cylinders,Close the squish up,Mild porting too the exhaust port,power valve modification,Bore the carbs too 35mm,Approximate cost $2500.00 unless you can do it yourself,Kit reedvalves and so on.Add that to your $3000.00 RGV and your no better off than on a stock SV

cheers billy, plus add in cost of a rebuild as a`starting point, namely cylinder replating, crank rebuild,maybe rods,pistons, thats the cost of an sv right there in the engine,and before touching the suspention

the attractiveness of a turn key and forget sv650 is huge. a standard one could be at the pointy end of f3 in the right hands. I miss my old one

**t3mp0r4ry nzr** · 23rd January 2009, 07:14

Originally Posted by jrandom

Does anyone else find it mildly amusing that on the racetrack, an SV650 is a lardy torque monster, and on the road, it's chickwheels?

yeah i dont stop finding that amusing! its plenty fast on the road. playing with a cb900 hornet and vtr1000 up the parapara one day last year was priceless! come the twisty stuff I would dissapear then wait up on the straights, did this for the 20-30km length of the dodgy road. when I pulled over to turn around and go home, they stopped me and stood stairing at the bike for 10 minutes, looking as pale as hell, couldnt believe a "chicks bike" could go so quick!

**t3mp0r4ry nzr** · 23rd January 2009, 07:19

Originally Posted by rachprice

O-rings, base gasket and pipes I think

cheers. yeah I read that on the rgv website.is this simply raising the port and closing up the squish (machined ring for tzr o-ring)? these changes plus jetting will get 70hp? im a sceptical bastard at the best of times. good numbers if possible.

good luck with your upcoming racing