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Forum: Car Nitro & Gas Engines

07-10-2012, 10:56 PM

Replies: 73

Induction Timing

Views: 21,669

Posted By downunder

RE: Induction Timing

Regardless of the info I've given long ago I totally agree with you. Any manufacturer worth his salt (like Rossi for instance) knows far more than any of us as to what's needed for high performance...

Forum: Car Nitro & Gas Engines

03-12-2011, 07:50 PM

Replies: 73

Induction Timing

Views: 21,669

Posted By downunder

RE: Induction Timing

This is about the best I can think of to walk you through the spreadsheet and the formulas used so you can make up your own spreadsheet but you have to make sure you put everything in the same cell...

Forum: Car Nitro & Gas Engines

09-29-2007, 10:10 AM

Replies: 73

Induction Timing

Views: 21,669

Posted By downunder

RE: Induction Timing

If you want the maths for balancing a single cylinder engine then go to http://home.planet.nl/~wakke007/fmv/fmv_3.htm section 3.5 Balancing. Basically the best compromise is reached when the crank...

Forum: Car Nitro & Gas Engines

07-02-2007, 09:56 AM

Replies: 73

Induction Timing

Views: 21,669

Posted By downunder

RE: Induction Timing

Unfortunately the attachment manager will only do .gif .txt and .jpg files so I had to change the file extensions to .jpg so it would accept them. It can't show a thumbnail because it's not a photo...

Forum: Car Nitro & Gas Engines

07-01-2007, 10:20 PM

Replies: 73

Induction Timing

Views: 21,669

Posted By downunder

RE: Induction Timing

Further to that formula for piston height compared to crankshaft angle I finally managed to make up a spreadsheet in both Works and Excel. Plug in the rod length (centre to centre), the stroke and...

Forum: Car Nitro & Gas Engines

06-30-2007, 10:57 PM

Replies: 73

Induction Timing

Views: 21,669

Posted By downunder

RE: Induction Timing

I use a spreadsheet when I check out a new engine to record the vital statistics like bore, stroke, shims, squish clearance etc. When I enter the bore and stroke it automatically fills in for swept...

Forum: Car Nitro & Gas Engines

06-30-2007, 09:46 AM

Replies: 73

Induction Timing

Views: 21,669

Posted By downunder

RE: Induction Timing

I'm dreadful at trigonometry and not much better at algebra so I'm going to try to put that formula into a spreadsheet to do the dirty work for me :D.

Forum: Car Nitro & Gas Engines

06-17-2007, 09:19 PM

Replies: 73

Induction Timing

Views: 21,669

Posted By downunder

RE: Induction Timing

There are two ways to do it. One is with a degree wheel and the other is by using trigonometry.

With trig you're converting piston travel (linear movement) in the bore to rotational angles but...

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