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170, 198, 225 oh my!
https://www.slantsix.org/forum/viewtopic.php?t=49757		 Page 2 of 2
Author:  wjajr [ Mon Sep 10, 2012 1:51 pm ]
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Dan said Bill said:
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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.
Author:  SlantSixDan [ Mon Sep 10, 2012 4:19 pm ]
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The question was -- and is -- of displacement. Not of larger-displacement-equivalent effect by dint of forced induction, but of displacement. Period.
Author:  aspen76 [ Mon Sep 10, 2012 4:58 pm ]
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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.
Author:  Reactor89 [ Mon Sep 10, 2012 4:58 pm ]
Post subject: 
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.
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