Horsepower figures (Street bikes only please)

[Anonymous]

I guess the hp can be measured at the rear wheel or at the crank depending how the test is made

[Anonymous]

Re: Horsepower figures (Street bikes only please)

1075cc, cleaned ports, stage 1 Yoshi cams, 29 mikuni smoothbores, Tingate exhaust plus minor tweaks in 1980 8 valve GS1000st equals 105hp at back wheel. Any HP figures that match (higher or lower don't care) Thanks

Hi Sharpy,

1085cc, cleaned up ports, 3 angle valve seats, Stage 1 Kent Cams, 36mm Mikuni RS flatslides, Eagle exhaust, welded crank. 1978 or 79 8 valve GS1000 in a 750 chassis equals 110 bhp at rear wheel (Dynojet 250 dyno) or 114 bhp if I take the K&Ns off and go up a size on the mains.

[sharpy]

HP Stories

Please don't rave on about this and that, just state # of valves , state of tune and hp figures please thanks

[Anonymous]

Raving on is our favorite pass time.

[saaz]

Raving on is it here! I have a setup similar to Brit but only with 28mm carbs. Havn't bothered with a dyno run. Comparative numbers are not very meaningful unless run on the same dyno the same day. It seems to go ok.

[Anonymous]

I ran mine on the dyno to make sure the carbs were set up spot on. It was very beneficial as the air/fuel ratio analyser showed I was running rich which was causing the hesitation I had noticed on the road.
Other than that Saaz you're right.

[Hoomgar]

Thanks Guys, not sure I really understand fully but I will bug my mechanic about it more when I go out there.

[skip]

Re: HP Stories

Please don't rave on about this and that, just state # of valves , state of tune and hp figures please thanks

dont rave on? what are you a party pooper? you have to rave on about all the work in the bike because it all adds to the performance figures you will get.

[Anonymous]

Hoomgar wrote:

Thanks Guys, not sure I really understand fully but I will bug my mechanic about it more when I go out there.

the dyno is called a brake, it simulates as if the bike were driving, the brake just gives resistance to better estimate horsepower. if you had the rear wheel off the ground and somehow could measure horsepower still, the figures might be considerably different, because the engine needs a load to perform with maximum efficiency.

I'm pretty sure thats how it goes...if not, then at least it looks good in writing
Ian

[Anonymous]

The latest "Motor Cyclist" has an article on a 250MPH Hayabusa with something like 400+ horsepower. AND it is still street ridable.

Harrison

[Hoomgar]

Yes they are amasing to say the least. We have dyno runs of Busa's with minimal mods on them (under 11g) that dyno'd at over 280 hp

They are a truely incredible machine and a tribute to Jap bike engineering in the late part of last centary.

[massakins]

'78 GS1000 2v, 1085cc, welded crank, HD cylinder studs, HD clutch backing plate, lockup plate, 18# boost and 188 RWHP. Stock head, cams, valves, transmission, clutch, etc. Very streetable, except for the wheelies. Street chassis (+3" swingarm)= 6.90s @ 106mph in 1/8. Drag chassis (=6" swingarm, slick, wheelie bars, lightened)= 5.70s @ 126mph in 1/8. And improving each day out. Oh yeah, rider dresses out at 275# as well. Would really run with a normal sized fella on it.

[Hoomgar]

'78 GS1000 2v, 1085cc, welded crank, HD cylinder studs, HD clutch backing plate, lockup plate, 18# boost and 188 RWHP. Stock head, cams, valves, transmission, clutch, etc. Very streetable, except for the wheelies. Street chassis (+3" swingarm)= 6.90s @ 106mph in 1/8. Drag chassis (=6" swingarm, slick, wheelie bars, lightened)= 5.70s @ 126mph in 1/8. And improving each day out. Oh yeah, rider dresses out at 275# as well. Would really run with a normal sized fella on it.

That's very close to what I am going to have when I am done with mine this year. At least the top end and welded crank anyway.

[Dink]

BHP or Brake Horse Power, is rear wheel horse torque as measured on a water braked dyno, these were the original dyno's and surprisingly enough they incorporated a water brake to simulate loads and worked out your torque graph from how much braking force was required.
Remembering of cause that there is no way of measuring horsepower, Horsepower is always a calculated figure, basically torque times revs equals horsepower. which is hw modern bikes are producing more power, more revs.
Dink
BTW I have no idea what sort of HP my Kat has, but it is way quicker than my stock 1150.

[Anonymous]

Larry do you still have the 81 gs1100e if so do you have any pics and engine specs. I have been wanting to boost performance on my 81 gs 1100e for the last couple of years haven't desided how radical I want to go.....

Any info would help.