I know this isn't my imagination, but my 2.8 is a lot more powerful than my 3.1. Correct me if I'm wrong, but the 3.1 has more torque and HP than the 2.8.

I can jump the line really good and get the car to move a hell of a lot faster than it did with the 3.1.

Any ideas??

 

the 3.1 is barely stronger than the 2.8, its not like its a HUGE difference.

And your 2.8 is probably in better tune than your 3.1 was, so it feels more powerfull.

 

Better tune.

 

Better tune. Now you see why the FIRST thing to do, is TomP's Major TuneUp

 

even if the state of tune is almost identical, the 2.8 has a slightly shorter stroke, so it revs a little faster, getting to the powerband sooner. Just a theory.

 

Nope... might rev faster, but why do guys stroke a 383 from a 350?

No replacement for Displacement! (wtf am I talking about? I'm the one turbo'ing a 2.8!!! )

Seriously, all else equal, a 3.1 is faster than a 2.8.

 

for an extra 33 cubic inches. The 3.1 is only 18 cubes bigger, not that big of a difference. Don't know how much of the stroke the extra 18 takes up power-wise, but it was a theory...

 

thinking about it, the 3.1 is a 10% increase over the 2.8...WTF am i smoking??? I think it's time to pass. :lala:

 

That is backwards as the reason guys build 383 is cause they rev faster, why they build it as a 383 and not a 400. The 383 is smaller than the 400 but it will rev faster and is faster even thought it is "smaller".

If you compared the 350 and 355 that would come out closer to what your saying. but the 383 is 2 steps shy of a 400 but for a good reason. the 327 was better than the 350 cause it reved so much. THe chevy 302 was awsome too and it is rumored [car n driver tv] to be able to handle 8-9000rpm stock all day long.

The 2.8 is one of the best motors made, it rev's the fast and is a possiable 14,000 rpm engine if you could get the parts.


Matt

 

I think you're misunderstanding... I ment the 3.1 is superior over the 2.8, since it simply has more cubic inches. It's more powerful, all else equal. It's ability to 'rev' is only one part of the equation! Since they both top out around 5800 stock, with similar camshafts, the 3.1 is the more powerful (135 vs 140hp, and 160 vs 180 lbs/ft).

Same basic reason that a 455 makes a better street engine than a 400 (PMD). Longer stroke generally makes more torque.

that's why guys stroke their 350's to 383... more ci and longer stroke!

 

I think it's because I actually stared at it

but seriously, it could be in a better tune, and/or actually have less miles on it. 111, 645.2 on the 2.8