Dyno questions? - Page 3

Cutty72 · 12-18-2008, 01:02 AM

Quote:

Originally Posted by HRCNICK11

I kinda key in on this point

that's why I ride a vtwin. HP ain't shit w/o torque.

Dnyce · 12-18-2008, 01:04 AM

Quote:

Originally Posted by Cutty72

that's why I ride a vtwin. HP ain't shit w/o torque.

lol-i think u missed his point

Cutty72 · 12-18-2008, 01:06 AM

Quote:

Originally Posted by Dnyce

lol-i think u missed his point

no. a v twin will make a higher torque number at any given HP number.
A I4 will make a higher HP number at any given torque number (compared to said vtwin)

That was my point. I do know that they increase together.

Rsv1000R · 12-18-2008, 08:58 AM

Quote:

Originally Posted by Cutty72

no. a v twin will make a higher torque number at any given HP number.
A I4 will make a higher HP number at any given torque number (compared to said vtwin)

That was my point. I do know that they increase together.

What?

A v-twin makes more torque than the same displacement I-4 because it's port velocity is higher because in general they have less valve area/displacement.

You might want to read my post here

Rsv1000R · 12-18-2008, 10:06 AM

Quote:

Originally Posted by Cutty72

Riddle me this then. Why are the peaks from 4th 5th and 6th not all identical? (run started in 2nd)
All gears were run to redline

Inertial Dyno's are not that accurate.

Cutty72 · 12-18-2008, 05:06 PM

Quote:

Originally Posted by Rsv1000R

What?

A v-twin makes more torque than the same displacement I-4 because it's port velocity is higher because in general they have less valve area/displacement.

You might want to read my post here

so I forgot to put in the "same displacement" part...

Rsv1000R · 12-19-2008, 10:49 AM

Quote:

Originally Posted by Cutty72

so I forgot to put in the "same displacement" part...

You also left out that it's the rpm that determines how much hp x amount of torque makes, and if a twin and a four make the same torque at the same rpm, they're making the same hp.

pickle.of.doom · 12-19-2008, 11:58 AM

It depends on if someone is getting some tuning actually done, or if they just want a piece of paper to wipe their ass with. For tuning, you want the rider sitting on the bike. The bigger key is that no matter which way you do it, standing or sitting, you need to be consistent. Some guys always sit. Some guys always stand. But whichever, you need to stick with one to keep your consistency.

HRCNICK11 · 12-19-2008, 05:08 PM

One of the good reasons to ride a v-twin is the decreasing torque curve. Its kind 0f a built in traction control. As the revs increase the torque eitherstays flat or decreases, post peak torque anyway.

If you look at just the torque curve on a inline 4 they tend to increase through most of the rev range. Where as a v-twin tends to decrease so as they rev (like during tire spin) they tend to have less torque than a few rpms lower.

On reaseon for that early lowend torque is the flywheel weight and big monster pistons.

Not to mention they have what I call a longer coast than most inline 4s. This is what the new R1s try to emulate with the big bang engines.

12-19-2008, 11:58 AM	#28
pickle.of.doom el diablo de verde Join Date: Feb 2008 Location: Howell, MI Moto: VTR, CBR, DRZSM Posts: 1,046	It depends on if someone is getting some tuning actually done, or if they just want a piece of paper to wipe their ass with. For tuning, you want the rider sitting on the bike. The bigger key is that no matter which way you do it, standing or sitting, you need to be consistent. Some guys always sit. Some guys always stand. But whichever, you need to stick with one to keep your consistency. __________________ WOS Forums

12-19-2008, 05:08 PM	#29
HRCNICK11 Canyon Carver Join Date: Nov 2008 Posts: 429	One of the good reasons to ride a v-twin is the decreasing torque curve. Its kind 0f a built in traction control. As the revs increase the torque eitherstays flat or decreases, post peak torque anyway. If you look at just the torque curve on a inline 4 they tend to increase through most of the rev range. Where as a v-twin tends to decrease so as they rev (like during tire spin) they tend to have less torque than a few rpms lower. On reaseon for that early lowend torque is the flywheel weight and big monster pistons. Not to mention they have what I call a longer coast than most inline 4s. This is what the new R1s try to emulate with the big bang engines.