The OAD has two springs that are wound in opposite directions. This gives a springy absorption of initial torque, and a more smooth dampening of jerking vibrations when the accelerator is released and the engine slows. This gives better belt wear, slightly better fuel economy and a need for maintenance replacement of the pulley more often. Unfortunately the cost of a new pulley is close to that of a new aftermarket alternator, so there is a serious price to pay for this maintenance. I'll hazard a guess it is more than the tiny fuel economy increment. Automakers were pushed by government to increase fuel economy, and they sacrificed durability and even engine survival. Why is that not a surprise?
in other words.dont buy newer vehicles.they are intentionally & carefully overcomplicated to milk your wallet dry when you buy them.but more importantly keep you buying constantly failing parts thruout your ownership.buy an older car & keep your money.im still driving a 1990 ford.30 years & 200+k miles.still runs like a champ.why buy something that is designed to fail?
The OAD is designed for modern 4-bangers that use diesel or direct injection. They don't run smooth like a V8, so all the engine accesories are always speeding up and slowing down, measurably, between cylinders firing. The heavy alternator stator puts pressure on all the accessories. The OAD mitigates this harshness and helps all the accessories last longer. It can also help smooth out the belt drive on V8s with a big, rough camshaft. The OAP is useful on high power V8s with firm shifting transmissions. I know when my OAP needs changing when the belt squeels like a stuck pig when I shift and engine rpms drop from 6500 to 4000 or so.
@@Adam1nToronto Hey Adam What is the difference between OAP and OAD??? Can we see the difference with eyes??? Can we replace an OAP pulley with an OAD pulley????
These pulleys are a bunch of crap. Got to replace them at 60,000 MI. My old 2000 Impala had 260,000 miles on it before I sold it never did anything to the alternator. The alternator had a solid pulley. Imagine that.
Why do you say it's the worst thing you can do you didn't go into details. What will happen to the belt?
More complicated, more expensive and more likely to break. Making more profits for the auto makers.
Would is be beneficial to install and OAP or OAD to a vehicle that has a regular Solid Pulley?
What is the difference between OAP and OAD???
Can we see the difference with eyes???
So which one is better? OAD OR OAP?
The OAD has two springs that are wound in opposite directions. This gives a springy absorption of initial torque, and a more smooth dampening of jerking vibrations when the accelerator is released and the engine slows. This gives better belt wear, slightly better fuel economy and a need for maintenance replacement of the pulley more often. Unfortunately the cost of a new pulley is close to that of a new aftermarket alternator, so there is a serious price to pay for this maintenance. I'll hazard a guess it is more than the tiny fuel economy increment. Automakers were pushed by government to increase fuel economy, and they sacrificed durability and even engine survival. Why is that not a surprise?
@@spelunkerd
What is the difference between OAP and OAD???
Can we see the difference with eyes???
Can we replace an OAP pulley with an OAD pulley????
in other words.dont buy newer vehicles.they are intentionally & carefully overcomplicated to milk your wallet dry when you buy them.but more importantly keep you buying constantly failing parts thruout your ownership.buy an older car & keep your money.im still driving a 1990 ford.30 years & 200+k miles.still runs like a champ.why buy something that is designed to fail?
It's always been a race for better fuel economy
The OAD is designed for modern 4-bangers that use diesel or direct injection. They don't run smooth like a V8, so all the engine accesories are always speeding up and slowing down, measurably, between cylinders firing. The heavy alternator stator puts pressure on all the accessories. The OAD mitigates this harshness and helps all the accessories last longer. It can also help smooth out the belt drive on V8s with a big, rough camshaft.
The OAP is useful on high power V8s with firm shifting transmissions. I know when my OAP needs changing when the belt squeels like a stuck pig when I shift and engine rpms drop from 6500 to 4000 or so.
@@Adam1nToronto
Hey Adam
What is the difference between OAP and OAD???
Can we see the difference with eyes???
Can we replace an OAP pulley with an OAD pulley????
👏🏽👏🏽👏🏽👏🏽👏🏽
These pulleys are a bunch of crap. Got to replace them at 60,000 MI. My old 2000 Impala had 260,000 miles on it before I sold it never did anything to the alternator. The alternator had a solid pulley. Imagine that.