HarleyTechTalk

Trying to make this easier for folks to find and use. Coyote made us a single web page to access our various interactive or static spreadsheets that we create and use. As time goes on this is the place where new sheets will be added.


Interactive Calculators and Charts

The Twin Cam camshaft list with comparison capability has been updated. You no longer need to look on one page for an index number to enter in the cam comparator and data sheet. Now you only need to use the drop down list box in the far left hand column to browse and select a cam.

We've spent some time trying to make these worksheets look better on screen, and to be easier to use without scrolling too much.

To date we have these five calculator / comparators.

A Bore and Stroke Calculator you can use to determine what specific bore or stroke changes will give you.

A new Interactive CAM Comparison Chart for Twin Cam and M8. This one now has both TC and M8 cams in it. There are two separate pages for the two engine models.

The Interactive Fuel Injection Calculator is basically the same as was loaded in the Tuning / AFR forum.

A Top End Build Calculator for Evo, Twin Cam and M8. This is helpful to see what different stroke, piston, cylinder length, rod length, etc. has effect on piston height in the cylinder, and what the resulting squish will be. All based on math, variations in actual parts dimensions used effects the outcome.

An Adjustable Pushrod Depth Calculator. Just plug in the thread pitch, lifter depth desired, and see how many turns are needed. It also shows by either four or six nut flats if you prefer to count them that way.

We have a compression calculation workbook loaded in the Design Tools web application. This is setup for both Twin Cam and M8 motors. There are two separate sheets, one for each TC and M8.   

https://harleytechtalk.com/tools/vtwin_comp.html

This how my 124" build specs out.

We added the Evo Big Twin to the compression calculator. The name is now "Compression Calculator for Evo Big Twin, Twin Cam and M8" application. It has the Evo cams loaded as well.

We added a flow conversion tool to the group of interactive calculators. This you can input the flow in inches of water in the Source Flow cell on the left, and then also for the desired flow numbers you add the flow you want to see in inches of water in the Target Flow cell on the right side.

Then in the left column put the flow values you have in the appropriate cells and see the converted flow values in the right column.

This can be used for any flowed object such as heads, throttle bodies, carburetors, exhaust systems, etc. As long as you know the flow and the inches of water it was flowed at. The cells with the valve lifts play no part in the conversion. They're there just for reference.


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We added the three Dave Mackie M8 cams, Dave Mackie 454, 478 and 528 to the Interactive CAM Comparison Chart

We added some new content to the Camshaft comparator tool. You can now compare Evo Big Twin, Shovel, and Pan cams. Shovel and Pan are on the same page since some will interchange pretty well, just a rocker ratio difference. 1.42 for Shovel and 1.50 for Pan.


https://harleytechtalk.com/tools/HD_cam_data.html

We added another calculator, an Intake Width Calculator based on changes to head gasket thickness, cylinder length and the amount that you mill from the heads.

In order to get the value, you need to input the current conditions in Example #1, and then the changes being made in Example #2. This will give you a + or - value of the distance changes between the cylinder head intake surfaces.


Intake Flange Width Calculator


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We updated the Evo cams table with Leineweber cams. You'll see a single cam listed with either 0.020" timing or 0.053" timing. Using the 0.053" timing will allow you to make comparisons to all other Evo cams and it make sense.

Thankfully Mr. Leineweber gave us the duration values in both 0.020" and 0.053". The lobe installed degrees doesn't change, so then I'm able to calculate the rest of the cams values from the duration and the lobe centers.


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Excellent

Thank you

We have an upgrade to the Intake Manifold Width calculator, probably will be the final change. Since measuring from the edge of the intake port, or the edge of the intake manifold, are both effected by the port diameter, the measurements would have to be exact to figure out the width of the manifold needed.

So what I learned thanks to Bob Behn is that the intake ports in the heads of a Twin Cam are 4.100" exact center to center between the ports. That's from the actual center of the port opening. He also gives the info that the S&S intake manifold for the stock TC motor is part number 410. That of course is based on the measurement of 4.100".

S&S used to sell measuring tools and fixtures to measure the actual port centerlines. They no longer produce these.

So the new calculator will show a stock TC intake width as 4.100". And the calculated new dimension based on the cylinder length changes, amount removed from the heads, etc. The example below is 4.124", or an increased width of 0.024" over a stock TC.


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Quote from: Ohio HD on April 08, 2023, 09:13:18 PMThe Twin Cam camshaft list with comparison capability has been updated. You no longer need to look on one page for an index number to enter in the cam comparator and data sheet. Now you only need to use the drop down list box in the far left hand column to browse and select a cam.

Looking, don't see Feuling 543? I may have missed it but...

F543
I .543" lift, 238° duration, timing 15/43.
E .553" lift, 248° duration, timing 56/12

We added a simple gearing application that you can compare your current gearing setup to changes you made or are wanting to change to.

It's called: "Simple Gear Ratio / RPM Generator"   

We added a new tab in the APP "Interactive Fuel Injection Calculator", the tab is named "HP from Injector Size". This is to see how much horsepower that your injectors should be able to support. 

There are two results, one at a fuel pressure of 43.5 psi and one at 58.0 psi. The automotive industry uses 43.5 psi as a standard calculation. Harley Davidson uses 58.0 psi.

Putting a value to the injector duty cycle will change the horsepower output estimate. Generally 80% to 90% is used.

If you have any questions, just ask.

We have an updated camshaft comparator. The Feuling 543 from rigidthumper above. Also four cams from Area 51 Racing. Three for TC motors, 588, 590, 664, and one for M8 motors their 465 cam.

We added a new M8 cam from Zippers Performance. They have a 2nd GEN2 cam for the VVT bikes. Their RS532 has been added to the list of cams. They suggest that this cam will give an increase across the RPM range.

https://harleytechtalk.com/tools/HD_cam_data.html

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