using a diesel power plant

dove'd85 · Jul 25, 2007

4cyl toyota turbo diesel 2.4TD not cheap but man it would be cool to put into a buggy:stirpot:

Binder · Jul 25, 2007

GRW said:
But when you have that much torque through out the RPM range does it matter?

No the torque doesn't matter at all.....This is one of the biggest myths people believe driven by all of the diesel truck commercials on TV. Diesels tend to have high torque numbers simply because they tend to operate at low RPM's. Torque doesn't move anything, it's about HP.

CrustyJeep · Jul 25, 2007

Binder said:
No the torque doesn't matter at all.....This is one of the biggest myths people believe driven by all of the diesel truck commercials on TV. Diesels tend to have high torque numbers simply because they tend to operate at low RPM's. Torque doesn't move anything, it's about HP.

You are pissing in the wind, you must know that. Everybody thinks torque means something. Just give up :haha:

SACD_Runner · Jul 25, 2007

boxboy said:
put a bigger turbo on it to add some more boost

Wrong,
bigger turbo's= ton's of lag
smaller turbo's= less lag (which would be ideal)

Thus the reason some companies are introducing a bi-turbo setup where a smaller turbo kicks in at a low rev, building enough boost to kick in the larger one.

Remeber no matter how much you turn up the boost it still wont kick in untill you get the right airflow/start spinning the compressors wheel in the direction of boost rather then vacume. (bigger turbo-bigger wheel-longer wait)

Binder said:
No the torque doesn't matter at all.....This is one of the biggest myths people believe driven by all of the diesel truck commercials on TV. Diesels tend to have high torque numbers simply because they tend to operate at low RPM's. Torque doesn't move anything, it's about HP.

I dont follow with where you're going here. Your telling me a rig with 1000hp and lets say 250ftlbs of torque can out tow a 250hp 1000ftlb of torque rig?

In all of my years of racing, though it's been short, an easy way to seperate the two is "torque gets you off the line, hp gets you the mph". If what im saying wrong please enlighten me. By no means do I say this in a form of arguement but rather in a way of ed-ja-ma-ca-ting. thanks-Justin

CrustyJeep · Jul 25, 2007

SACD_Runner said:
I dont follow with where you're going here. Your telling me a rig with 1000hp and lets say 250ftlbs of torque can out tow a 250hp 1000ftlb of torque rig?

That's exactly right, assuming each is geared correctly and the numbers are accurate.

Torque is a rating of force. HP is a rating of the ability to do work. You can take a big ole' breaker bar and produce several hundred ft-lbs of torque on a bolt head, but you cannot do anywhere near one HP worth of work.

Torque is a meaningless number without an RPM number to go with it. Combine the two, and you have HP.

When people say "torque", generally what they mean is low RPM HP. Binder is being technical :flipoff:

TreeClimber · Jul 25, 2007

Jeez,

This thread is going goofy. Yes, a diesel can work fine. Yes, I've personally seen a couple of them at work. No, I wouldn't ever put one in myself. Both of the ones' I've personally seen work were 4 cyl, Cummin's. I also know a guy who transplanted a common rail from a Liberty into his TJ.

T

CrustyJeep · Jul 25, 2007

TreeClimber said:
No, I wouldn't ever put one in myself.

Please explain your reasoning for the rest of the class

SACD_Runner · Jul 25, 2007

CrustyJeep said:
That's exactly right, assuming each is geared correctly and the numbers are accurate.

Torque is a rating of force. HP is a rating of the ability to do work. You can take a big ole' breaker bar and produce several hundred ft-lbs of torque on a bolt head, but you cannot do anywhere near one HP worth of work.

Torque is a meaningless number without an RPM number to go with it. Combine the two, and you have HP.

When people say "torque", generally what they mean is low RPM HP. Binder is being technical :flipoff:

thanks for the info. and all of these years (4) ive been lied to... :booo: haha

w/e

Binder · Jul 25, 2007

SACD_Runner said:
I dont follow with where you're going here. Your telling me a rig with 1000hp and lets say 250ftlbs of torque can out tow a 250hp 1000ftlb of torque rig?

Yes....1000 HP will out tow 250 HP. If you use the torque numbers all that it will tell you is what RPM your making the HP......Torque X RPM/5252=HP
In a nutshell it's like Crusty said. Torque is just a twisting motion with or without actually moving. HP is work done over a period of time. The period of time part is what indicates that actual work is being done.
In the real world torque is what breaks parts. A axle for instance doesn't care how fast it's spinning but just how much torque it takes to break it. For a piston engine max torque is where the most force is on the pistons to rods to crank. ......Yes at high RPMs centifical force comes into play on spinning parts but that's another issue.