125 HP?

larrycavan wrote:

caffcruiser wrote:

<br><br>Post edited by: caffcruiser, at: 2006/09/29 09:45

Do that with stock pistons and kiss the ring lands good-bye....you need forged pistons for juice.

Oh really? Coulda fooled me. Last I checked it kinda depended on the shot and timing/tuning.

Duck wrote:

energy is power multiplied by time

I doubt Lorcan is running at full output for more than 80 seconds. 800kw-sec is about what it takes to boil 10 cups of water. Heat energy is radiated and when "the chain" is referenced, it's likely the chain, sprockets, and tires.

Friction in the driveline increases with power so the percentage loss will be less at 20hp than at 200.

I would not be surprised it the 5% loss number is correct at full output.

-Duck

5% power loss for the entire driveline sounds believable to me.

"Understanding Constant Mesh Transmissions" by David Searle, Motorcycle Consumer News, December 2006:

"Of course, friction in the gear reduction systems will prevent 100%-efficient transmission, and the tire itself will consume some power. Between 15-25% of the engine's rated crankshaft horsepower will typically disappear between the 'brochure' and its rear wheel output on the dyno."

Exitpupil wrote:

Thanks to this thread I'm spending more money than I intended! I ordered a 1075cc overbore kit and .410 cams to complement the 34mm carbs. Cry once and be done with it. The grin factor should dry up the tears.

Well said!

With a bone stock cylinderhead clearances for the cams, good valve job and properly jetted carbs, your combination should rival the 83GPz, within reasonable expectations.

What you have is:

1. slightly smaller bore
2. slightly more cam
3. better breathing top end "potential" from the carbs
4. smaller valves, port runners and poorer flowing cylinderhead with a less efficient combustion chamber design.

If you are leaving the head stock, it's a mistake.

To take advantave of the 34mm carbs on a KZ1000 head, the port runners need to be opened up or you're going to have a pronounced ridge where the port is smaller than the intake boot at the port entrance. Not Good for HP/TQ.

While you can certainly do the runner match for the carbs and stop there, a full street port job would be something to consider.

JMO

Larry C

Post edited by: larrycavan, at: 2006/12/09 09:23

Post edited by: larrycavan, at: 2006/12/09 09:28

steell wrote:

Duck wrote:

energy is power multiplied by time

I doubt Lorcan is running at full output for more than 80 seconds. 800kw-sec is about what it takes to boil 10 cups of water. Heat energy is radiated and when "the chain" is referenced, it's likely the chain, sprockets, and tires.

Friction in the driveline increases with power so the percentage loss will be less at 20hp than at 200.

I would not be surprised it the 5% loss number is correct at full output.

-Duck

5% power loss for the entire driveline sounds believable to me.

It might be worth considering the losses of the bike originally referenced could be 10-15%. It's easy to imagine an old Honda with 50SHP, a 630 chain, and crappy old school tires only getting 43HP to the dyno.

77KZ650 wrote:

hey wireman, tell the guy what you have builtB)

im just sitting back and watching:P

Bobs right! The common transmission loss is 15% flywheel to rear wheel. For example A new GSX-R1000 has 180 flywheel horsepower and 155 rear wheel.

Peace&Love:woohoo: , Darren

Post edited by: kyradawg, at: 2006/12/09 11:22

Larry,
I ported it to the specs you calculated. I'll report when I get it running. Should be a combo that will satisfy me for a vintage bike

why is it that everyone thinks you gain 600hp just by removing the edge inside the intake track? If the valve seat is too small, the engine air doesnt know the ridge is even there. And furthermore, .410 cams, ported head, and 400mm carbs will not get you 125 horseepowers. maybe those itty bitty horses. If you don't match the gasket surface it wont even start. Hshshaahaahahahah,.