Home | Register | Login | Contact Us

 
Auto Math
Classifieds
Forum
Gallery
Games
Garage
Tech Articles
Utilites
 
FAQFAQ    SearchSearch    RegisterRegister    Log inLog in    Log in to check your private messagesLog in to check your private messages    Forum Subscriptions1/4 Mile Table 

since nobody else posts in this section...
Goto page Previous  1, 2
 
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Drag Racing
View previous topic :: View next topic  
Author Message
osmiumfoot
Member


Joined: 11 Jun 2002
Posts: 299

2387.84 points



PostPosted: Thu Jan 12, 2006 3:17 pm    Post subject: Reply with quote

Some of the car magazines I try to decipher have run comparison tests with a 377 sbc against a 383 sbc, the 377 being more oversquare with a 4.155 bore and a 3.48 stroke versus the 383 with a 4.030 bore and 3.75 stroke. On the dyno the 383 wins, although not by a huge amount. Opposite that, they have run similar displacement big and small block chevys and the oversquare big block rules on the dyno, but there are other variables there like valve shrouding and head design. For what its worth.
Back to top
View user's profile Send private message
Big Dave
Moderator


Joined: 04 Dec 2005
Posts: 2663
Location: Tampa Florida
120538.84 points



PostPosted: Thu Jan 12, 2006 4:02 pm    Post subject: You get what you pay for! Reply with quote

Bigger is better most of the time; especially when you get to choose how to run a test stacked in your favor. They always stop the dyno pull at around 6,400 RPM citing the limitation on the rotating assembly for the 383 (sounds fair; after all you can not compare a running engine to one in pieces).

If you look at the dyno sheets the 377 is still climbing while the 383 is usually done. If you have a graph the 383 has been going down (past peak horse power and way past peak torque) when they shut off the test. However if you look at the 377 it is usually just above peak torque and well below peak horse power when they pull the plug. It wants to rev higher because it is way over square (the 383 is a 1/4 inch over square; the 377 is 3/4 inch over). Most 377 engines shift from 8,600 to 9,800 RPM just like the old 302 used to (think of it as a 302 on steroids).

You must remember that Primedia can sell their mags for a buck a copy to subscribers because they live off advertising dollars. The ones doing the advertising sell cast iron crank 383 rotating assemblies more than any other kit. You don't pay someone to bad mouth your bread and butter money maker. (But if the writer is honest you can usually read between the lines).

Big Dave
Back to top
View user's profile Send private message
osmiumfoot
Member


Joined: 11 Jun 2002
Posts: 299

2387.84 points



PostPosted: Thu Jan 12, 2006 5:47 pm    Post subject: Reply with quote

You pose some interesting points, and they are well taken.
Back to top
View user's profile Send private message
66burban
Member


Joined: 25 Dec 2005
Posts: 49
Location: north dakota
1755.34 points


1966 Chevrolet Suburban

PostPosted: Sun Jan 15, 2006 1:40 pm    Post subject: Reply with quote

I agree with what you say dave, but only a couple things that I would like to point out. First sure the PEAK numbers are in different rpm ranges, but most of the time, the 383 in this case will almost always make more power across the board than the 377 which for most people is more important than peak numbers.
Second for a race engine with good parts (expensive) in the bottom end, sure rev it to the moon, but for the street, most people do not want to have to run to 8600 to 9800 to make the peak potential of their crusier.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Drag Racing All times are GMT - 5 Hours
Goto page Previous  1, 2
Page 2 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
Home | Contact Us | Automath | Cam Files | Dyno Search | Forum | Garage | Picture Gallery | Reaction Timer

Copyright 1997-2018 SMOKEmUP.com All rights reserved.
Advertising Info     Disclaimer     Privacy Policy