In a farm diesel vs farm gasoline engine in a 4020 for example . The 4020 gas engine was smaller than the diesel and still made the same lugged torque and Peak HP.
A diesel without variable cam timing is stuck being a low rpm engine because the camshaft duration is so short. Stick the same cam in a gasser and it will also make peak torque at 1200-1500rpm, peak HP at 2100-2400rpm and fall flat on it's face when reved 200rpm past peak HP rpm. Why ? Beacause the engine can't breath due to the valves not being open long enough and high enough.
That is another point, valve to piston interference . The higher compresson diesel has to waiting for the piston to drop out of the way during the intake stroke .before opening the intake valve to keep the intake valve from hitting the piston.
Same as the exhaust valve has to close before the piston reaches TDC on the exhaust stroke to clear the diesel piston .
The short cam timing is also required to maximize combustion chamber pressure and thus heat while cranking the engine over to start.
Great for low rpm torque but in order to make serious HP. The expense and complexity of a turbo must be added. Then the engine must be beefed up even heavier to handle the stress of much higher combustion chamber pressures.
As for rpm being the one, sole factor influencing wear, isn't so. The same engine making 50HP at 1500rpm with the injection system at max delivery, combustion chamber pressure at max, thrust on the wrist pins, connecting rod bearings and crankshaft at max.
Take the same engine and rev it at 1800rpm and making 50 HP operating at 83.3% of max pressure and thrust.
It's going to operate more hours making 50 HP less stressed at 1800rpm than making 50HP at 1500rpm pushed to the max.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
... [Read Article]
Latest Ad:
1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
