KENut

Ha ha, gee I am very good at making myself look stupid. I'll go sit in the corner now.

I'm not heaps into motorbikes but 100hp is easily realistic isn't it? Yeah I know what your saying, it would be useless and not fast but it would sound awesome. It would put a lot of strain on the motorbike components but hey, it has been done before albeit rarely (because its not worth it I guess). I've thought about this before and the main problem in my mind would be how you get the drive to the wheels? I have seen one car that had a Hayabusa engine/gearbox with a driveshaft to the back wheels, but I'm not sure thats the best way.

I was thinking, now this isn't really practical/cheap/don't know bout legalities. BUT what would be awesome is a 1000cc Yamaha motorbike engine. No, it isn't a Toyota engine but they both come from japan right? And Yamaha has designed heads for Toyota as well. Come on, you know you want a sequential shift gearbox. Plus imagine the 'street cred'.

In reponse to Philbey's question, yes the equation (and the other equations) τ1 = ½ x 10 x 0.22 x 0 = 0.2 Nm is wrong. The underlined 2 is meant to be the square of 0.2. I was typing this in Word and just copied it into the reply mewhatsit and didn't bother reading after I posted it, so sorry about that. (The other equations have squares in them too). I can fix it but meh, I'm sure no-one really cares that much. And basically I was referring to the flywheel as a single uniform disc, completely seperate from the engine, not taking into account the energy taken from the engine to rotate it. I was just saying that for the flywheel to continue to do its job (impart momentum on the engine to promote smooth rotation) properly, a lighter flywheel must have a larger radius. So what Trav_555 said, but I dunno bout the engine spinning easier/more torque output bit i.e. I'm sick and too lazy to even think about it.

Flywheels utilise angular momentum to keep an engine rotating. So if Flywheel 1 has a larger angular momentum than Flywheel 2, the engine that Flywheel 1 is attached to will accelerate and decelerate slower than the engine Flywheel 2 is mounted on. This larger momentum is useful especially in road cars for going up and down hills. But if you want an engine that gains revs quicker, lightening the flywheel (lowering the momentum) will help. But torque and the radius of the flywheel is also related to the angular momentum of the flywheel. Angular Momentum = Moment of Inertia x Angular Velocity L = Iω I (moment of Inertia) for a disc = 1/2mr2 where m is mass in kg and r is radius in meters. ω (Angular Velocity) = θ/t where θ is the angle in radians and t is time in seconds. (note: there are 6.28 radians in 360 degrees) So if we have 2 Flywheels (discs) with different mass (eg 10kg and 9kg) but the same radius (eg 0.2m) the momentum of the flywheels will be different. If they both have a speed of 1000 rpm then ω = ((1000/60) revs/second x 6.28 rads) / 1second = 104.67 radians per second L1 (Angular Momentum of flywheel 1) = ½ x 10kg x 0.22 x 104.67 = 20.93 kgm2s-1 L2 (Angular Momentum of flywheel 2) =1/2 x 9kg x 0.22 x 104.67 = 18.84 kgm2s-1 That’s a fairly big difference in momentum between the two flywheels. But then there is also the torque of these flywheels; Torque (τ) = I x Angular Accleration In this case Angular Acceleration is zero, because they are rotating at a constant speed. τ1 = ½ x 10 x 0.22 x 0 = 0.2 Nm τ2 = ½ x 9 x 0.22 x 0 = 0.18 Nm The torque is not the same! For the torque of each flywheel to be the same the radius must change. Using the Torque value of the first flywheel (where its radius was 0.2m); 0.2 Nm = ½ x 10 x r12 = ½ x 9 x r22 0.2 = ½ x 9 x r22 r2 = √(0.2 / (1/2 x 9)) = 0.211m That is a difference of 11mm for the same torque value, which is quite large in engine terms. So this shows that for a lighter flywheel the radius (or where the radius at which a large portion of the mass is) needs to be greater to retain the same amount of torque.

Sorry obviously I wasn't being clear with what I said before. I did not mean to say that you can improve torque with lightening a flywheel which is why I said this; "the main purpose of lightening is to reduce the moment of inertia of the flywheel so that the engine can gain revs more quickly without losing torque" or much torque at least. Like I also said before torque is the force times the radius, so the further out the weight the less loss of torque.

I disagree with Camerondownunder88 about his method of lightening. If you lighten just the outside you will lose torque. You should get the centre area lightened; torque = force x radius, therefore the more weight on the outside (ie larger radius than the inside) the more force and therefore torque. Also the main prupose of lightening is to reduce the moment of inertia of the flywheel so that the engine can gain revs more quickly without losing torque, so I believe this is the way to go.

My KE70 had the same problem, especially the stutters when you push the load pedal down quick. If you have a look at the carbie you'll see that the accelerator pump linkage has a spring on it to sort of slow the application of the pump when the throttle is pushed. Start the car (when its hot) and hop under the bonnet. Hold the accelerator pump down at the linkage end and push the throttle at the same time. If the engine revs up quicker than normal you know its getting too much fuel. I fixed mine by getting a carbie kit ($45) for it and tuning it.

um.. no As Rich_Rolla says your killing my spirit. Anyway I think we all know Corollas are the best and therefore the fastest cars on the planet.

Yeah pretty much he wasn't trying, but it made me feel good for a little while

I got beaten by a girl on a Vespa off the lights a while back.. But the other day i almost kept up with an R33 GTR around some roundabouts.. but he was also changing at about 4 and half grand 4K POWAH!

Name: Bart 1982 KE70 CS Engine: 4K 5speed, stock Suspension: Stock, needs upgrade, handles like a bowl of porridge Wheels, Tyres: Rolla mags, Nexen 185's Interior: Stock, pretty good Body: Stock, not much rust, custom car park dings

I'll race you to those strackers seabiscuit! nah joking. When you ask the guy for a price, just say corrolla exhaust manifold cos if you say extractors he'll jack the price up to like a million dollars. Maybe see if there is two sets, one for me as well? Good luck with it :party: