Crower Billet Crankshaft?

[McRat]

Now there's a good question. The difference between 7.1L and 6.6L is about 8%. Are you saying by only changing the displacement will yield 8% more power? I think power will increase, but not enough to matter. I do know that if the original fueling is used the egts will be lower under similar circumstances.

Now if we take our 8% larger displacement engine and add fuel above what was used in the 6.6L until the same egt's are achieved, what is our power output going to look like?

Assuming you had the same "correct" fuel air ratio, and the same VE, yup, you'll gain about 8% power. If you are limited on fuel, sure, you're not going to gain much, if anything.

We are doing our setup on a 6.6L, then transfering the parts over to a 7.1L and re-tuning. So in about 4 months, I should have the answer I hope.

 

[malibu795]

ok so pick a rpm window..
an mean 400hp diesel and a mean 400hp gassed...

the diesel will mean 700-750tq were then gasser be lucky to break 400tq

and your still tellign me a gasser will accel faster then a diesel? giving same wieght?

i have a 500hp 383.. in a ~7000lb truck.. it WILL not keep up with a 500hp diesel of the same weight........ why?

from what you are saying the gasser should smoke the diesel....... which the oposite is true

 

[McRat]

Let's put it this way, my trap speeds were 120mph with 1350ft/lb, and 126mph with 1090ftlb.

So I should go back to the 1350ft/lb setup?

 

[Diesel power]

Let's put it this way, my trap speeds were 120mph with 1350ft/lb, and 126mph with 1090ftlb.

So I should go back to the 1350ft/lb setup?

all that shows is that you made more HP with less TQ so i would guess you had more RPM?

 

[malibu795]

whats thr rpm diff between the two... iirc its less then 300rpm diff betweent he two trap speed with a 3.54 gears and 28" tires

you your self stated that after X rpm the tq startes to drop.

i have only seen a few dyno sheet were TQ was flat lined...

i dont think you could get were you were with out 1350 somewere in your power band.

with said tire and gears said truck is turnign 3500(120)-3700rpm(126) accors the stripe..

put a 800hp gasser in casper and see how fast it goes... hell build a 8.1L and swap it in... i bet you will need more hp out of a gas motor then a diesel to go just as fast.

i would say that if you can get 1350 and a higher rpm or a flater curve you Will be faster..

if tq wasnt important to do work weather that be a-b as fast as possible, pullling a grade with 2XXXXlb then why does diesel do it faster with less power then a gas motor?

 

[moss]

off topic

 

[juddski88]

very

 

[TrentNell]

i think a better way to word it adam is peak torque is not relative in drag racing but average torque through out a gear is so if at 3000 rpms your far from peak torque but say 700 ftlbs with a 6.6 and 800ftlbs with a stroker and the # is consistantly higher through the rpm range regarless of the # the stroker should turn a quicker time , if i am missing something i would love to learn i am no expert but in theroy it works .

 

[McRat]

all that shows is that you made more HP with less TQ so i would guess you had more RPM?

Same HP, more area under the curve on the second.

 

[malibu795]

i think a better way to word it adam is peak torque is not relative in drag racing but average torque through out a gear is so if at 3000 rpms your far from peak torque but say 700 ftlbs with a 6.6 and 800ftlbs with a stroker and the # is consistantly higher through the rpm range regarless of the # the stroker should turn a quicker time , if i am missing something i would love to learn i am no expert but in theroy it works .

peak power is braging selling rights thats it...

i would rather have a 450pk hp and 425 avg power then a 500hp peak and 400avg power band

the down side to more tq is more thing break

 

[Redbone]

i think a better way to word it adam is peak torque is not relative in drag racing but average torque through out a gear is so if at 3000 rpms your far from peak torque but say 700 ftlbs with a 6.6 and 800ftlbs with a stroker and the # is consistantly higher through the rpm range regarless of the # the stroker should turn a quicker time , if i am missing something i would love to learn i am no expert but in theroy it works .

Something like this:

 

[TrentNell]

Something like this:

i understand that part of the of the equation but the statment has been made torque is not relevant and i say it is with the same curve you have drawn even if the torque still fell off the same and curves were identical but on the 7.1 your #'s were 100 ftlbs higher across the curve in the racing rpm , even though its falling the truck should run faster . because the average torque is higher .

 

[Redbone]

I think we're saying the same thing. Peak numbers don't mean squat. The curves I drew were exaggerated. What matters is the area under the curve in the racing RPM range.

After multiplication through the tranny and diff, divide the torque by the tire diameter to get thrust delivered to the ground for a given RPM. That's all that matters........................................and boobs.

 

[TrentNell]

ya its easy to see in your own head but hard to explain :hug:

 

[Diesel power]

Same HP, more area under the curve on the second.

if there were more TQ across the curve then HP would have had to been raised as well.
TQxRPM makes HP right?

 

[McRat]

if there were more TQ across the curve then HP would have had to been raised as well.
TQxRPM makes HP right?

Yup. But area under the torque curve means nothing, and if you set the shift points based on the torque curve instead of the HP curve, you will redefine what slow is.

So if torque Runs The Show, it's very long and boring show.

 

[WolfLMM]

Tq rise is what makes the difference between a 500hp gas and 500hp diesel. The diesel will be quicker cause the tq ramps up quickly.

tq gets the load moving, while hp carries the load down the track. At least thats my take on it

 

[Mike L.]

You guys sure gave Diesel power what he wanted. Sounds like a steve cole argument.

 

[TrentNell]

You guys sure gave Diesel power what he wanted. Sounds like a steve cole argument.

i thought we were just talking about general engine building for the most horse power and what the potential that the 7.1 kit had vs standard stroke
i thought that everyone has the same feeling of it being superior in the potential , except diesel power
unless we were dooped , was brought to his level and beaten with experience :rofl:

on edit we may have derailed the topic

 

[Diesel power]

i thought we were just talking about general engine building for the most horse power and what the potential that the 7.1 kit had vs standard stroke
i thought that everyone has the same feeling of it being superior in the potential , except diesel power
unless we were dooped , was brought to his level and beaten with experience :rofl:

on edit we may have derailed the topic

As of right now everyone that i know of who runs the stroker kit has gained little if any HP, but they claim much faster spool up....
I think it's a great idea, but what looks good on paper is not always good in the real world!