Slant *       6       Forum
Home Home Home
The Place to Go for Slant Six Info!
Click here to help support the Slant Six Forum!
It is currently Wed Nov 19, 2025 2:26 am

Unanswered topics | Active topics


» » Tech Q & A » Engine

All times are UTC-08:00



Post new topic  Reply to topic  Page 2 of 2
  [ 19 posts ]  Go to page Previous 1 2
  Print view Previous topic | Next topic 
Author Message
wjajr
 Post subject:
PostPosted: Mon Sep 10, 2012 1:51 pm 
Offline
Supercharged
User avatar

Joined: Sat Feb 16, 2008 1:25 pm
Posts: 5612
Location: Downeast Maine
Car Model:
Dan said Bill said:
Quote:
Quote:
wjajr wrote:

Displacement in normally aspirated engine is dependent on stroke, bore and number of cylinders yes, but forced induction changes the equation

…but does not change the displacement, which is short for "piston displacement" and is dependent only on bore, stroke, and number of cylinders.


This is what I said:
Displacement in normally aspirated engine is dependent on stroke, bore and number of cylinders yes, but forced induction changes the equation when more air/fuel is stuff into those bores, and the resulting power output is as if those dimensions or number of cylinders were substantially increased.



Take note of the additional 27 words that were missing from Dan’s quote. I did not state that the displacement changed, I implied a different result is seen when additional air & fuel is crammed into that constant displacement over what a normally aspirated charge would contain being seen as a power increase.

_________________
67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

Image
Top
   
Reply with quote  
SlantSixDan
 Post subject:
PostPosted: Mon Sep 10, 2012 4:19 pm 
Offline
Board Sponsor & Contributor

Joined: Thu Oct 31, 2002 5:39 pm
Posts: 24788
Location: North America
Car Model:
The question was -- and is -- of displacement. Not of larger-displacement-equivalent effect by dint of forced induction, but of displacement. Period.

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.

Image
Top
   
Reply with quote  
aspen76
 Post subject:
PostPosted: Mon Sep 10, 2012 4:58 pm 
Offline
TBI Slant 6
User avatar

Joined: Sat Jan 07, 2012 4:44 pm
Posts: 128
Location: Tampa Bay Area, FL
Car Model:
Quote:
Quote:
I know that this is just a modded 225 but anyone know what, and at what rpm, the peak HP and Torque is for the 260 slant in the stroker article?
With all that low end torque, sounds like the best build for a daily driver.
Funny you should ask...

That 260 engine currently "lives" in our 66 Dart wagon (the "tow car") that my son Allen also drives daily. The main "performance limitation"... still has a 1 bbl carb on it.

We just got back from the Redding SL6 race and there was one of those portable "chassis dynos" there on Sunday, with a "racer special" price of $19.95 for a test.
Allen put the wagon on the dyno and it made just over 100 HP at the rear tires. Torque number were high but I do not remember the actual amount.
The dyno operator said that he should have started his test measurements, for this vehicle, at a lower RPM, they started recording numbers at 2500 RPM and the engine was already at a high torque value.
They also started looking for "a problem" when they saw the HP numbers flatten-out at around 3500 RPMs... then they saw the 1 bbl carb. and said: "there's your problem". :roll: :lol:

I will see if Allen can "jump-in" with more details...
A few different SL6 cars went onto that chassis dyno and many put-out some pretty good numbers.
DD
I would love to do a 260 build someday, maybe try out a super six set up on it. One of those automotive calculators (here) thinks it should do about 240 HP, of course calculators aren't real world. I suppose me doing a 260 build would be dependent on me winning the lottery :lol:

Thanks for the front exhaust manifold by the way Doc, I forgot to thank you/ let you know I got it. Waiting for a local exhaust shop to fix it's car lift but should be getting it installed this week or next.

_________________
76 Dodge Aspen
225 Super Six w/ Dutra True Dual Exhaust

http://i1245.photobucket.com/albums/gg5 ... AG0095.jpg
http://www.youtube.com/user/BZuko1?feature=guide
Top
   
Reply with quote  
Reactor89
 Post subject:
PostPosted: Mon Sep 10, 2012 4:58 pm 
Offline
SL6 Racer
User avatar

Joined: Mon Oct 06, 2008 10:09 pm
Posts: 16
Car Model: 1964 Valiant Wagon
Quote:
Allen put the wagon on the dyno and it made just over 100 HP at the rear tires. Torque number were high but I do not remember the actual amount.
The dyno operator said that he should have started his test measurements, for this vehicle, at a lower RPM, they started recording numbers at 2500 RPM and the engine was already at a high torque value.
Well I don't have the dyno print out in front of me but here is what I remember.

The wagon's BHP peaked at 102 around 3500 rpm like Doc said but what was most interesting to me was the curves them self.

The BHP curve was parabolic, with a very gradual increase and decrease.

The torque curve was a plateau of sorts.

By 2500 rpm the stroked slant 6 in the wagon had already hit ~168 ft/lbs of torque and this stayed practical constant to about 3700 - 3800 rpm before dropping off sharply along with the horse power.

I can't guarantee the accuracy of this single set of data but it is interesting.

_________________
Image
Top
   
Reply with quote  
Display posts from previous:  Sort by  
Post new topic  Reply to topic  Page 2 of 2
  [ 19 posts ]  Go to page Previous 1 2

» » Tech Q & A » Engine

All times are UTC-08:00

Who is online

Users browsing this forum: Google [Bot] and 14 guests

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 post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited