Stock ST1300 Dyno Run

dduelin · Feb 24, 2008

I thought I would post the numbers on my ST1300. The bike had 44,125 miles on it at the time, stock everything, +/- 23,000 miles on spark plugs & air filter. The numbers in the middle of the graph were at 6200 RPM.

WeeSTer · Feb 24, 2008

Those numbers are pretty well the same as any others for the ST13 that I have seen. Gotta love that flat torque curve though the entire rev range.

George · Feb 24, 2008

Interesting to note that the 1300 has no more torque than the 1100.

Found STick's runs from 6/22/96, torque shows 78, HP 92. That was all stock except for K&N air filter. That was on a Dynojet Model 100.

dduelin · Feb 25, 2008

George said:
Interesting to note that the 1300 has no more torque than the 1100.

Found STick's runs from 6/22/96, torque shows 78, HP 92. That was all stock except for K&N air filter. That was on a Dynojet Model 100.

There are lots of variables in rear wheel numbers on the same machine much less different ones. Mine are on the low side of those reported in print for the 1300 and yours is higher than some I found. Contemporary numbers on the 1100 were somewhat lower than yours - the low 70's for torque output. I ran my Beemer as well and it's numbers were ~4 less in hp and torque from a run a year ago on a different machine.

Regardless these 1100/1300 V4's have a great reputation for torque pumps.

George · Feb 25, 2008

Yeah, there's always variables, manufactuer tolerances, etc. Also, STick had over 50,000 miles at the test, well broken in.

bigbikerrick · Jul 8, 2020

I like how they do the "V" very similar in feel to a Guzzi, but with more power,and smoother! Its the way "The Vee was meant to be". I have always been a big fan of Honda V fours, having owned a couple of Magnas.
Rick.

bigbikerrick · Jul 8, 2020

bigbikerrick said:
I like how they do the "V" very similar in feel to a Guzzi, but with more power,and smoother! Its the way "The Vee was meant to be". I have always been a big fan of Honda V fours, having owned a couple of Magnas.
Rick.

dduelin said:
There are lots of variables in rear wheel numbers on the same machine much less different ones. Mine are on the low side of those reported in print for the 1300 and yours is higher than some I found. Contemporary numbers on the 1100 were somewhat lower than yours - the low 70's for torque output. I ran my Beemer as well and it's numbers were ~4 less in hp and torque from a run a year ago on a different machine.

Regardless these 1100/1300 V4's have a great reputation for torque pumps.

Torque "pumps" indeed! Makes it the ideal sidecar tug, IMHO. Its all about torque when pulling a good sized chair, especially with a good sized passenger in the car. Man, that V4 really shines in this situation. When you need to pass another vehicle, on the hilly 2 lane, Arizona roads I usually ride on, it makes a big difference in safety. This powerful rig ,with sidecar brake is awesome at doing a "whip lane change" when needed.HeHeHe.

Catmandu2 · Jul 8, 2020

dduelin said:
I ran my Beemer as well and it's numbers were ~4 less in hp and torque from a run a year ago on a different machine.

cool Dave,,, can you throw up the bmw's chart as well ?? Cheers,, CAt'

OkieRider · Jul 8, 2020

The high torque on the ST is because two pistons fire at once, so it's like a big twin. Torque value nearly identical to my VTX1300 v-twin. However, the ST's 4 cylinder design means the pistons don't have to travel as far as they would on a twin (2x325 have a shorter stroke than 1x650), so you can rev higher for the same effective displacement. Because HP is really just a function of torque and rpm, higher rpms for a given torque value means more hp. So the ST beats the tar out of the VTX in terms of hp. The "V" aspect, specifically the 90 degree v of the ST, gives huge benefits in terms of vibration cancellation. Also the engine is shorter than an inline (which is why inline 4s are transverse, so they don't result in a stretched wheelbase).

I've wanted one for many years, now I have one and I'm wrenching more than riding, but it's almost sorted out. Not so much an issue with the machine as with how it has been cared for in the past.

Duporth · Jul 8, 2020

Very interesting. Thanks for posting dd. When it comes to such info I am a just reader and absorber, not a learned one, so please keep it coming.

Shawn K · Jul 8, 2020

OkieRider said:
The high torque on the ST is because two pistons fire at once, so it's like a big twin.

That's incorrect.

The firing order is No. 1 - 90°, No. 4 - 270°, No. 3 - 90°, No. 2 - 270°.

No pistons fire simultaneously.

And the torque of the engine is because of the bore/stroke and cam timing/duration.

OkieRider · Jul 8, 2020

OK, you got me, not literally simultaneously. But for any one piston firing, the next one is on its heels, which is "quite soon" at even 3k RPMs. Perhaps more like a big bang (minus the resting time) than a twin.

While we're being literal, torque is more literally a function of the weight of the air/fuel charge for a given level of combustion efficiency. You don't get more torque out of a different size bore/stroke or with different cam timing except to the extent the different size or timing affects efficiency of combustion or the weight of the air/fuel charge.

SMSW · Jul 8, 2020

I don't want to know how many hp or ft-lbs of torque, how fast was it going on that dyno? :rofl1:

Now that dumb question is out of the way, I've heard some horror stories by the guys who do the dyno runs about engines blowing up or the guy strapping the bike down making a mistake or the restraint system failing. In the last case, the bike really is going like a bat out of the shop - until it hits the brick wall.

dduelin · Jul 8, 2020

OkieRider said:
The high torque on the ST is because two pistons fire at once, so it's like a big twin. Torque value nearly identical to my VTX1300 v-twin. However, the ST's 4 cylinder design means the pistons don't have to travel as far as they would on a twin (2x325 have a shorter stroke than 1x650), so you can rev higher for the same effective displacement. Because HP is really just a function of torque and rpm, higher rpms for a given torque value means more hp. So the ST beats the tar out of the VTX in terms of hp. The "V" aspect, specifically the 90 degree v of the ST, gives huge benefits in terms of vibration cancellation. Also the engine is shorter than an inline (which is why inline 4s are transverse, so they don't result in a stretched wheelbase).

I've wanted one for many years, now I have one and I'm wrenching more than riding, but it's almost sorted out. Not so much an issue with the machine as with how it has been cared for in the past.

The ST1300 has a 360 degree crankshaft and takes two complete revolutions to fire all four cylinders. Like Shawn posted no two fire simultaneously. Bang Long Pause Bang Pause Bang Long Pause Bang.

dduelin · Jul 8, 2020

Catmandu2 said:
cool Dave,,, can you throw up the bmw's chart as well ?? Cheers,, CAt'

The Beemer was my 1981 R100. I'm not sure I can find a copy of that dyno run. When I sold that bike in 2012 the three ring binder went with it.

Catmandu2 · Jul 8, 2020

dduelin said:
The Beemer was my 1981 R100

Ohhhh, DD,,, I thought you meant it was your new R12 !! CAt'

Larry Fine · Jul 8, 2020

I've thought of putting one of my bikes on a dynamometer when they've showed up with portable ones in a trailer at events, but then I start thinking that it involves intentionally placing the maximum possible amount of strain on the engine and drive train.

"Thank you, no!"

dduelin · Jul 9, 2020

Larry Fine said:
I've thought of putting one of my bikes on a dynamometer when they've showed up with portable ones in a trailer at events, but then I start thinking that it involves intentionally placing the maximum possible amount of strain on the engine and drive train.

"Thank you, no!"

No more than a full throttle roll-on from a rolling start. It can handle it if you can.

"Pocketa pocketa pocketa"

Stock ST1300 Dyno Run

dduelin

Tune my heart to sing Thy grace

WeeSTer

George

dduelin

Tune my heart to sing Thy grace

George

bigbikerrick

bigbikerrick

Catmandu2

OkieRider

Duporth

Shawn K

Professional Cat Confuser

OkieRider

SMSW

dduelin

Tune my heart to sing Thy grace

dduelin

Tune my heart to sing Thy grace

Catmandu2

Larry Fine

dduelin

Tune my heart to sing Thy grace