Anyone know if there is a formula for calculating peak rpm hp with the cam duration included? Didnt see any on wallace.

Too many variables.

When you really wanna know, you dyno it.

Other than that, it’s just a guesstimate.

Yeah, i understand. Just looking for a guess anyway. Not sure where to shift this 511 at once i get to the track. 330cc heads and a 270@50 solid cam. Seems to pull hard to upper 6000 range. Thanks

If you're serious about how it runs on the track, then you should be testing different shift RPM points. Pick a starting point (6500?) and go up & down in 200 RPM increments to see what works better.

Even the "good" engine sim programs I've used have been really hit-or-miss on predicting peak HP and torque RPMs. They were off as much as 300-500 RPM on their predictions compared to actual engine dyno testing (e.g., over-predicted torque peak RPM by 300 and under-predicted HP peak RPM by 500).

I agree. 6500 is a good starting point. The simulators are not accurate from what i have see. My guess would be 6700/6800 peak hp on my combo. Was hoping someone here had something simular and knew what theirs is.

Solid roller or flat tappet ?
For what it is worth , my 505 with a 272@050 solid flat tappet .5400ish converter , 4.1 gear 28"radial .
Chassis dyno always showed peak HP at converter stall(5100 footbrake vert) , but motor pulled to 6500 without any drop off
With CNC source heads , Victor and 4150 prosystems carb I shifted at 6000 . 10.50s . I tried a little more not big gain , but it never seemed to give up under 7000 with either converter .
With TF270 heads , bigger tbrake vert , Super Victor and 1050 dominator . I only ran this a couple times . BUT shifting at 6000 it didn't fall back onto converter , shift light stayed on @6000 - so stall increased .
10.25@130 .
I believe with the bigger heads it wanted a higher shift probably 64-6600 which would have allowed rpm drop back to converter on shift

That is now to be another day , due to block issues .
Why the low shift ? It ran the numbers I wanted and was doing it easily at low stress .

Tex

Sounds simular. I was watching some of my in car videos cruising the back roads and i was shifting at 6000 most of the time on pump gas. Now with a mix of 110/93 sunoco i find im shifting at 6500+ just going by sound and feel. On the street i rarely watch the tach. I have a vid edited that i will try to post. Had too much 110 to 93 and it didnt like it. Real fat but gives an idea .

https://youtu.be/JVHbtN-uVsE
Heres a in car vid running fat on 5 gal of 110 to 2 gal of 93. Tach is in the 6000 to 6700 rpm range. Now with 70/30 mix 110/93 runs way better pulling hard in the upper 6000 range and bouncing off the rev limiter at 7200 in first. I would say the peak power is at least at 6600. Vid no really a good example but it what i have now.

Solid flat tappet. 270/276. 640 lift on a 110.

If you shift at 6500 the actual rpm at the shift may actually BE 200 to 250 rpm higher. I found that out when i put in data logger. I run an airshifter on a rpm switch.

My turbo action valve body takes 600 rpm to complete the 1/2, 400 rpm on the 2/3.
Doug

Not rocket science.
Just try shifting it at different rpm and see what makes it ET best.
Try it at 66, 68 and 7000 and see what it likes best.

I start with 500 RPM increments and the go to 100 after finding the highest and lowest shift points, especially on putting any new parts in the car, converter, cam, jetting and so on

For sure, but thought i might try short shifting at 6000 to start. Then 6500 and go from there.

Any such way like that will ultimately find out what i likes best.
Love ya man, but frankly you make things more involved and harder than anybody that has ever posted on here... lol

Just who i am. I leave no stone unturned if possible. I like the opinion of others as well. Wheres the harm and besides, this site would pretty slow if no one was asking questions simple or not.

Never said there was any harm in it, but in this thread( like some others) you answered your own question. ....... try different rpms till it runs the best...... way early in the thread.
I suspect you already knew that to be the answer. Thats my only reason for saying what i said

Yes, you are correct . i usually have direction before the question, but i like to get others opinions on here because i have had my mine changed more than once on here. Always more than one way to skin a cat and i like to get all the angles. Sorry to irritate anyone with this.

Some people don't think well until they are irritaded or upset, no sense in letting them go through life without thinking
AKA, if you don't test and change things how are you going to learn