Gertrude - 2F high performance rebuild (2 Viewers)

[RUSH55]

Whoa!!! Did you get a torque reading?

 

[andrewfarmer]

Whoa!!! Did you get a torque reading?

no torque reading unfortunatly - I'd've liked to get a full torque/hp curve but it was getting too hot. Maybe next time.

 

[RUSH55]

Now, was this hp reading at the flywheel (did you pull the engine?) or at the rear wheels?

 

[Mace]

What dyno?

 

[andrewfarmer]

Now, was this hp reading at the flywheel (did you pull the engine?) or at the rear wheels?

At the rear wheels.

 

[andrewfarmer]

What dyno?

I didn't take much notice - it is a name brand I recognised - I think perhaps 'Sun'.

What does yours put out with the turbo?

 

[Mace]

145 RWHP,

I need a better cam badly..

Course, the 40's/14bolt/2 tcases/sm420 and the fact that I have never adjusted the valves and am running VERY rich in the propane dept... might have something to do with it too

 

[RUSH55]

Wow!! 218 at the flywheel is great, but 218 at the rear wheels is amazing. For all those who gaff at the idea that a 2F can't make 200hp....put this in your pipe and shmoketty-shmoke-shmoke-shhhhhhmoooke it!!

 

[andrewfarmer]

145 RWHP,

I need a better cam badly..

Course, the 40's/14bolt/2 tcases/sm420 and the fact that I have never adjusted the valves and am running VERY rich in the propane dept... might have something to do with it too

I had mine on the dyno because I'd had to replace the LPG regulator. The new one allowed me a much shorter hose to the mixer, and more importantly, got rid of 2 tight bends in the hose that were restricting the gas flow.

When we ran it up, I had to close up the power valve about 3 turns to get the mixture correct (at high rpm) from what had been the correct rate with the old reg and hose.

I also turned about 3mm out of the mixer (increasing diameter).

These changes only (and the fact the motor is run in now) nett me an increase from 135kw to 163kw.

Of course, if you're runniong too rich, maybe you just need to increase the boost to compensate!!

 

[RUSH55]

Andrew, in power or torque measurements, what is kw?

 

[Mace]

I had mine on the dyno because I'd had to replace the LPG regulator. The new one allowed me a much shorter hose to the mixer, and more importantly, got rid of 2 tight bends in the hose that were restricting the gas flow.

When we ran it up, I had to close up the power valve about 3 turns to get the mixture correct (at high rpm) from what had been the correct rate with the old reg and hose.

I also turned about 3mm out of the mixer (increasing diameter).

These changes only (and the fact the motor is run in now) nett me an increase from 135kw to 163kw.

Of course, if you're runniong too rich, maybe you just need to increase the boost to compensate!!

Unfortunately it does not work that way with a draw through system

 

[andrewfarmer]

Andrew, in power or torque measurements, what is kw?

Power, hp = 0.7457 kilowatts

 

[FoYoChe]

wow, a chevy would have been way easier I think.

 

[bustanutley]

and not near as cool

 

[Fantasma-4x4]

Wow...is amazing. As you can cool the oil?...


These coolers work? --> http://www.sor.com/shared/image/026-50_i-big.jpg


Bye!

 

[andrewfarmer]

Andrew, in power or torque measurements, what is kw?

Power - kilowatts.

1 horsepower = 0.746 kilowatts

 

[Chef]

Hey Andrew...just found this.
Nice work!

 

[FJ40onNOS]

im going to have my 40 dynoed just for the hell of it!

 

[jeffery_1965]

Torque and Horsepower are easily related to each other through the following equation:

Torque = HP x 5252 / RPM

Now the 218 hp was given at the rear wheel, but the speed was for the crank, 4500rpm, not the rear wheel. But one could play around with some assumptions, like the drivetrain is 85% efficient, thus leading to:

T = (218 / 0.85) x (5252 / 4500)

T = 300 ft lbs

If you vary the assumption for the efficiency +/- 10% it changes the torque by ~ 40 ft lbs each way.

Just thought I'd share, since someone wanted to know the torque numbers he was getting.

Jeff

 

[FJ40Jim]

Also, keep in mind that peak torque occurs much earlier than peak HP. Converting the Peak HP back to tq tells the tq at that RPM, but torque is already falling dramatically at the point peak HP hits. The engine could be making peak tq of 400 ft/lbs at a much lower RPM.