Old Diesel-Heads Going Gas

[Ken45101]

There's a world of difference between a $30 CPS sensor that you remove one bolt to change and the high-dollar problems (EGR Cooler etc) with the 6.0.

Not if you are 20 miles from the nearest phone or cell tower! Fortunately, mine died at home, right after we made a continuous drive from the backroads in southern Kentucky/northern Tenn (Big South Fork, Daniel Boone National Forest) without shutting the truck off! It would have been a major issue if I had shut if off when if we stopped on the backroads!

Ken

 

[F350]

?????$30.00??? They sure must have gone down! When I bought mine they were going for $200.00 at the Ford stealership! I found mine at the International dealer for $99.00 and was glad to pay it!

They are cheaper now...

 

[F350]

Not if you are 20 miles from the nearest phone or cell tower! Fortunately, mine died at home, right after we made a continuous drive from the backroads in southern Kentucky/northern Tenn (Big South Fork, Daniel Boone National Forest) without shutting the truck off! It would have been a major issue if I had shut if off when if we stopped on the backroads!

Ken

LOL..Understood. No breakdown is convienent, large or small.

 

[Murray B]

One of the biggest mistakes people make is thinking 500 HP from 1965 is the same as 500 HP from 2005m it's not even close to equal. The 2005 engine is actually making a LOT more power at 500 SAE HP than the older engine was at 500 NET HP.

An even bigger mistake is to take published figures as the actual figures. It was back in '72, if memory serves that they changed to the new h.p. ratings, and the power reduction was between 10 and 15%. For example the street Hemi rating went down to 370 h.p. from 425 or about 55 h.p. Those were the published figures. The only problem with them is that the street Hemi, and many other "hot" motors, was underrated. In the old h.p. the actual output according to Roger Huntington was more like 470h.p. So if you take 55 off of that you get about 415 new type h.p. which is pretty close to the power claimed using the old measurment.

It would be great if we could get actual measured power ratings and not figures that have been 'adjusted' for marketing, insurance, or competition purposes. Comparing altered power ratings can be difficult or impossible.

A few year ago I read one source that was quite amusing. They rated the street Hemi with 10.25:1 compression at 425 h.p. and a competition one with 12.5:1 compression at 430 h.p. It don't seem worth going to high-test gas just to gain 5 h.p.

It is kind of interesting that many dragsters today are using motors derived from that old engine.

 

[swines]

It would be great if we could get actual measured power ratings and not figures that have been 'adjusted' for marketing, insurance, or competition purposes. Comparing altered power ratings can be difficult or impossible.

The manufacturers cannot quote horsepower and torque figures unless the engine dyno run has been observed by an independent observer from the Society of Automotive Engineers (SAE). They have to follow a complete SAE set protocol. This includes verification of the engine setup being the same as production motors, etc.

The final results are taken by the SAE representative and reviewed. The manufacturers cannot quote numbers until receiving a letter from the SAE certifying the results.

There is no "adjusting" allowed - ratings are not "difficult" or "impossible" to compare - they are exactly what has been recorded under SAE supervision.

Specifically, the requirements for engine certification are found in SAE J1349: Certified Power, and the test procedures for certification are found in SAE J2723: Engine Power Test Code - Engine Power and Torque Certification.

 

[ModMech]

The manufacturers cannot quote horsepower and torque figures unless the engine dyno run has been observed by an independent observer from the Society of Automotive Engineers (SAE). They have to follow a complete SAE set protocol. This includes verification of the engine setup being the same as production motors, etc.

There is no disagreement but that's not the *whole* story....

As long as the HP and Tq figures come from a test conducted to "SAE" standards, it is valid. The problem is, there are a number of *slightly different* SAE test regimines for automotive engines and dozens more for non-automotive applications.

The ONLY way to compare two ratings is to look at the "*" and read the note that will tell you the SAE standard used during the test. If the standards are the SAME FOR BOTH TESTS, it's a valid comparision, otherwise, it is not.

 

[dodge man]

I can remember reading a fairly recent article where they tried to duplicate an exact factory 440 magnum engine. I know one thing they discovered was that compression ratios were too high. A factory 440 magnum was suppose to be rated a something like 10.25:1 and it ended up being something like 09.25:1. They were actually able to get pretty close to the factory horsepower and torque numbers, but as others have said, these were gross horsepower numbers.

Another thing I have learned, and this is from seeing a lot of factory cars, both new and old drag race, you can pretty much ignore the 0-60 and 1/4 mile times you read in magazines. They often make several runs, take the best run, and then correct it to sea level and standard temps. It is also not unusual that the factory slips a car magazine a warmed over vehicle. This took place in the 60's and it still happens today. If you want realistic 1/4 mile and 0-60 times, look to Consumers Reports. I'm not always a big fan of how they rate vehicles, but there times are realistic of real world and what a normal person could get the vehicle to do.

 

[Soundguy]

i've owned gasser trucks for as long as I can remember.. my first diesel vehicle was an isuzu trooper back in ? 88 or so.. I liked it.. but it was underpowered.

about a year ago I started driving a diesel f250 at work.. loved it.. currently I own a dodge ram gasser. I just recently bought a f450 diesel.. I don't plan on going back to a gas truck..

gas tractors are fine though!

soundguy