300 Vs 302
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Basically, all of that fancy math just explained what I said in an easy to understand format.
Torque is the twisting force of the crankshaft. How hard can the engine pull.
Horsepower is a derivative of torque, but it has to do with how fast the engine can accelerate at a given rpm.
High horsepower and a light vehicle make for a very fast accelerating car.
High torque will move your truck load and trailer with ease.
This is the nonphysics was of comparing the two.
If you were to rev each engine unloaded, the high HP engine will accelerate much faster than the high tq engine.
Jimmy
Torque is the twisting force of the crankshaft. How hard can the engine pull.
Horsepower is a derivative of torque, but it has to do with how fast the engine can accelerate at a given rpm.
High horsepower and a light vehicle make for a very fast accelerating car.
High torque will move your truck load and trailer with ease.
This is the nonphysics was of comparing the two.
If you were to rev each engine unloaded, the high HP engine will accelerate much faster than the high tq engine.
Jimmy
Elder User
Joined: Oct 2002
Posts: 743
Likes: 1
300 six- 1bbl carb w/ long stroke=low end torque and pulling power up to about 4k rpm.
302 v8-4bbl carb w/ short stroke=top end power for top end running ie 90 mph and up. Very simple arithmetic and engine management techniques.
302 v8-4bbl carb w/ short stroke=top end power for top end running ie 90 mph and up. Very simple arithmetic and engine management techniques.
Postmaster
Joined: Feb 2003
Posts: 3,441
Likes: 5
From: Muskegon, MI (home)
I have driven trucks with 302s and I own one with a 300, and I would never even dream of trading my 300. While a 302 is nice for beeboppin around town, it just cannot pull like a 300. The 302 has a full 1 inch shorter stroke than the 300 does. This allows it to rev higher but it hurts it when it comes to torque and pulling power. The 300 is okay for running around town too but when push comes to shove...the 300 is a much stronger workhorse.
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Ok, I think that we have this one settled then.
Long stroke, lotsa torque, short stroke , lotsa rpm and horsepower.
If ya wanna race, short stroke and lots of rpm.
If ya wanna tow some weight, long stroke and loads of torque.
Jimmy
Long stroke, lotsa torque, short stroke , lotsa rpm and horsepower.
If ya wanna race, short stroke and lots of rpm.
If ya wanna tow some weight, long stroke and loads of torque.
Jimmy
Tuned
Joined: Nov 2001
Posts: 281
Likes: 1
From: Back in Central Texas
What could the 300I6 do if a a 4bbl clifford intake and a 650 or 750 carb were installed?
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Joined: Dec 2001
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From: Louisville,Ky.
You can only feed so much air/fuel thru a log intake. With a carb that large, you will bottleneck in the intake and get really lean running cylinders on the ends, and overly rich ones in the center.
If you want to run a 4bbl on an inline 300, I would recommend a 390cfm Holley.
Jimmy
If you want to run a 4bbl on an inline 300, I would recommend a 390cfm Holley.
Jimmy
Elder User
Joined: Oct 2002
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Ideally an engine can use about cu-in\2 of cfm. So a 300 could go with up to 600 cfm. Realistically it's a lot less. It takes a pretty healthy motor to use 2 cfm for every cu-in. With the clifford intake, a good cam, head porting and header the 300 can really shine up to about 5000-5500 rpm with a 450cfm carb. Then the size of the intake/exhaust ports and the stroke begin to take their toll on it. With cast pistons critical piston speed is reached at approximately 5000-5500 rpm if I remember right. With forged it is bumped up to around 6500. If you've ever heard one of these engines at 6000 rpm, you can vouch for me when I say that they sound sweet, but very tight. Kinda like they are going to scatter in a million pieces at any moment.
Tuned
Joined: Jun 2001
Posts: 271
Likes: 6
From: Central Texas
Originally posted by lxman1
You can only feed so much air/fuel thru a log intake. With a carb that large, you will bottleneck in the intake and get really lean running cylinders on the ends, and overly rich ones in the center.
If you want to run a 4bbl on an inline 300, I would recommend a 390cfm Holley.
Jimmy
You can only feed so much air/fuel thru a log intake. With a carb that large, you will bottleneck in the intake and get really lean running cylinders on the ends, and overly rich ones in the center.
If you want to run a 4bbl on an inline 300, I would recommend a 390cfm Holley.
Jimmy
good vacuum at low rpm is what you need for good power at low PRM. that's why big cams don't make power down low, because with the big opening, there's not that much airflow at lower rpm's. another reason why variable valve timing is such a big deal, but that's for another thread.
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