tag:blogger.com,1999:blog-6582429758941507301.post2554173492085630638..comments2024-03-18T08:25:40.019-05:00Comments on Knucklehead Theology: 68 Inch Racer, part 3St. Leehttp://www.blogger.com/profile/01238671101561121436noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-6582429758941507301.post-2591181523052491102008-08-05T18:16:00.000-05:002008-08-05T18:16:00.000-05:00Hi Jack, I have been playing with your program, an...Hi Jack, I have been playing with your program, and have some questions/comments. <BR/><BR/>On the Engine Profile Utlities screen I found the Crank Angle/ABDC calculator a little confusing at first, but figured it out. For the Intake Close Angle, what is your program based on for the timing event? Measuring at .053" is pretty much the industry standard for Harleys. However the standard for automotive is .050", and Leineweber only gives his Knuck cam specs at .020". I am sure this difference will have a big effect on Effective Ratio results. <BR/><BR/>On the Compression Ratio with Calculated Chamber Volume screen, I came up with 12.15:1 (nominal) verses 12.26:1 on my Engine Analyser program. Pretty close, the difference being the EA program does not take into account the volume between the top ring and the piston deck, whereas yours does. <BR/><BR/>However, I had to add in the base gasket thickness to the cylinder height. Also, if I enter the cylinder height without the firering, it makes the piston to deck height figure confusing. On the other hand if I do add the firering height to the cylinder height it throws the comp ratio way off. <BR/><BR/>I really like the dome volume calculations menu.<BR/><BR/>It would be cool if you could incorporate something for the fire ring specs.<BR/><BR/>Overall, I think it's a pretty cool program, and I put it right on my desktop. Thanks for sharing it.St. Leehttps://www.blogger.com/profile/01238671101561121436noreply@blogger.comtag:blogger.com,1999:blog-6582429758941507301.post-25846914117459411252008-08-02T16:57:00.000-05:002008-08-02T16:57:00.000-05:00I'm following your 'paper engine' a bit. Will go ...I'm following your 'paper engine' a bit. Will go back and re-read them again, so that I can digest it all. If you have the time, I'd like for you to run your numbers on a piece of software that I am working on as time permits. It will probably stay in beta format for life, as I will always be changing it. Here is the link:<BR/><BR/>http://www.terra-glide.net/harley_tech.html<BR/><BR/>Scroll down and look for the program called EngUtils.exe. Right-click on it and save it anywhere. Or, you can run it straight from my page, as it requires no installation. I write software helps for myself, so that I don't have to scratch my head over calculations. The graphics are Romper Room at best. Drop me a note with feedback when you can. If you see any fixes that I need to make, I'll catch them the next time I have the notebook computer out. That's where I do my programming. Have a good one.<BR/><BR/>JackAnonymousnoreply@blogger.com