I had it saved but now for no [edit] reason my POS computer will not bring it up. I couldn't find it in a search, No idea why. I need the Excel format. Can anyone please send it to me, or at least point me in the direction of another one. The valve events are what I'm more interested in. I can find many other DCR calculators, but no valve events calculators. Please somebody throw me a bone here I'm about to pull out my [edit] hair b/c of this [edit] computer!

 

I have a C# one thatl'l calculate valve events for you, no excel spreadsheet though, but if you'd like I can make a spreadsheet farely quickly, or outline the math here for you so you can do it yourself. btw this post should be in general tech, not lt1/lt4 tech

 

Yeah that'd be great. Show me the math.

btw I just had a post moved for General to LT1 now this one needs to go from LT1 to General. I just can't win for losin' man!

 

Il'l post the math when I get home, Itl'l be ~ 45 mins prolly.

 

I found it in about 2 seconds with Google.

http://www.ls1tech.com/forums/showthread.php?t=394937

 

Welp shoebox beat me to it by finding the spreadsheet, you should be able to get the math out of it if you want, but if you still want me to post the math let me know and i will.

 

Math can be found here.

http://www.empirenet.com/pkelley2/DynamicCR.html

Variables used:

* RD = Rod horizontal Displacement in inches
* ICA = advertised Intake Closing timing (Angle) in degrees ABDC
* RR = Rod Distance in inches below crank CL
* RL = Rod Length
* PR1 = Piston Rise from RR in inches on crank CL.
* PR2 = Piston Rise from crank CL
* ST = STroke
* 1/2ST = one half the STroke
* DST = Dynamic STroke length to use for DCR calcs

What's going on: First we need to find some of the above variables. We need to calculate RD and RR. Then, using these number, we find PR1 and PR2. Finally, we plug these number into a formula to find the Dynamic Stroke (DST).

Calcs:

* RD = 1/2ST * (sine ICA)
* RR = 1/2ST * (cosine ICA)
* PR1 = sq root of ((RL*RL) - (RD*RD))
* PR2 = PR1 - RR
* DST = ST - ((PR2 + 1/2ST) - RL)

This result is what I call the Dynamic Stroke (DST), the distance remaining to TDC after the intake valve closes. This is the critical dimension needed to determine the Dynamic Compression Ratio. After calculating the DST, this dimension is used in place of the crankshaft stroke length for calculating the DCR. Most any CR calculator will work. Just enter the DST as the stroke and the result is the Dynamic CR. Of course, the more accurate the entries are the more accurate the results will be.

 

No, no, no. That's the exact spreadsheet I can't open. I was wondering if anybody has one or saved it as an Excel spreadsheet and could just email of pm it to me. Sorry, I probably wasn't clear on that.

 

Do you mean you can't open the zipped file? It works fine for me and I had never seen it before. Sounds like you have a computer problem.

 

Probably is hence the demeanor to start the thread.

 

You have an email, I sent it as an attachment. Did it work?

Mike

 

It asks me what program I want to open it with, or it will automatically chose it and open for me, then it says it can't open it!

 

Do you have excel installed?

 

I guess you need the Geek Squad.

Are you trying to open the zip file or the Excel file? You can get free copies of zip file utilities on the internet. If you can't open the Excel file, then you don't have Microsoft Excel or a compatible program to open it (or the file associations on your machine are messed up).

 

I opened the zip file last night. I do have Excel, but can't open the email. I'll get my friend to help me. he's a geek, but doesn't get paid for it...