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So I have another spread sheet wish list. How about the same cam profiles but in say a carb 20r (2.2) with a header. I know the head is different and size of combustion chamber etc.What data do you need to work the spread sheet?
Well, I did more "indepth research" and some rough calculations based upon Snowtoy, Gillesdetrail, the others who posted their experience with going to lower gears in the 3rd member - higher gear ratio (4.10 to 4.56 ring & pinion). It looks like I was wrong in my thinking. YES, it looks like if I swap 4.10s to 4.56s, it will put the RPM at 50, 60, 70, 80 MPH in 4th and 5th gears at a higher torque number (based on my desktop dyno software) within my usable the RPM range.
Warning................I'm not sure if all those cams play nice with the 22RE computer.......................
Question?The gear ratio magnification calculation is torque X gear ratio, right?So if my peak torque is 100 and my R&P in 4.10 my torque multiplied by 4.10 equals 410 lbs. If I go to 4.56s with same 100 lbs of torque before the 3rd member, my multiplied torque equals 456 lbs. The difference is 46 lbs of torque increase at the rear wheels when the engine RPM is at it's peak torque of 100 lbs.Is that correct?Thanks,Gnarls.
Come'on blackdiamond.... cut me a little slack. If you are inferring that I'd would pull a 16 trailer at 80 MPH with my truck and that's "crazy", you may be right, but I most likely will just keep the freeway speeds between 70 and 75 and between 60 and 65 on 2 lane and windy hilly roads. I live in AZ and if you ever get down here and drive on the 17 or 10 freeways on a Friday afternoon during the summer, I assume you'll be shocked when you get blown passed by guys pulling boats, jet skis, travel trailers, 5th wheels, and ATCs when you are going 75 MPH!!l Is it crazy? Yeah it can be. So going 80 MPH pulling a trailer where you live may be an oxymoron, but around here it seems to be the S.O.P.!!
At this point, I'm not even sure this engine and truck will be OK to pull a 16 or17' fiberglass Casita trailer??
I've pulled trailers with all 5 of my trucks a good number of times and I'm very aware of the dynamics involved. In fact, I believe my XtraCab will pull a 16' travel trailer, albeit slowly, I just know that the braking part of controlling it may be dicey, it ain't got the torque of a Dodge diesel. The weight of the trailer tends to "push" the back end around on the truck on deceleration and braking... and that can be safety issue.I have pulled a 21' Ski boat on a dual axle tandem trailer with my '85 shortbed 22R, with zero problems, I just didn't go over 65 MPH, and took extra care to avoid having to brake heavily.
I don't think I have any specs on Toy 20R. LCE is showing the 20R and 22s are the same camshaft.I could use the stock specs as a base line if I can find them.bore 88.5stroke same as a 22R 89mmhead cc's about 90cc but it is a hemispherical designcarb - single or duel plane ditch that get a good 22R carb and adapter or webercarb CFM 22R or weber are 325ishIntake runner length in inches about 8compression ratio about 9 stock but put that head on a early 22r block and SHAZZAAAAMMMMTonight I'll see what other data I can use to get more accurate with the output.Gnarls.
...No I mean I dont have an office program on this computer I cant open your spreadsheet.
UPDATE: Excel sheet on R&P Gear Ratio x Tire Size x 4th & 5th Gears, with torque numbers.I will convert it to a JPG for you know who tomorrow.These torque numbers are for my rebuild as I see it in my DD.I only calculated 31" tires and 33" tires, and for 4.10s, 4.56s, and 4.88s, and driving in 4th gear and 5th gear.The numbers and math clearly confirm what R&P you should consider for maximizing best torque in the RPM range.That sheet is about 4.5 hours of work on the computer!!Gnarls.
Double check your cells....... 4.88 80mph RPM should not equal 4.56 80mph RPM.................
You need to take into consideration the tire diameter tooo.... (not just R&P X torque)
Spreadsheets are fun. I would calculate the torque in 100 rpm intervals, if possible, and then use those numbers to calculate at torque vs. speed curve using the different tire sizes and diff gears. The best combination is the one with the most area/torque under the curve. You would just want to consider the speed range you're targeting.
LOL all you need to know about the 20R is 1. the carbs are very anemic2. the engines are bullet proof3. you need a header the stock exhaust is what is called a volumetric restrictor
... The reason I'm interested in this is that my 20r has clearly different and more eager driving characteristics than my 22r. That head is really doing something despite the smaller 2.2 displacement, even bone stock.
Hey blackdiamond,Oh yeah... that would be interesting, would you mind jumping right on that? I only calculated 50, 60, 70, and 80 MPH because my interest for this exercise is just the torque and power at highway speeds.Gnarls.
If you can give me a table with the torque curve I just might give it a shot. I love Excel spreadsheets. The issue is two small kids and finding time...
I am convinced the 20r is better than the 22r as far as drivability goes. Much more rev happy and feels like a better torque curve all around. I'm sure it's the head design.
A 28" tire @ 4.10 will have about the same effective torque as a 31" @ 4.56 and a 33" @ 4.88The larger diameter tire negates the higher ratio R&P.Take a look at 4.88 33" 5th and 4.56 31" 5th RPM. They are about the same. The 4.88 torque numbers look better, but really aren't because you lose some torque multiplication due to the larger diameter.
Hmmm... the torque numbers are different because of multiplication.Gnarls.
Yeah... what engine numbers would you like to see? The other data is available on a good number of websites with calculators.Gnarls.
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