TLicense Posted June 21, 2008 Share Posted June 21, 2008 I've created a spreadsheet that you can use to help calculate what the maximum RPM you should run to. It basically calculates for a given rev limit and piston mass what the load on the gudgeon pin is. If you assume that the stock set-up is safe and is 100% load, then you can increase the rev limit and see what comparative increase that would produce. You can then see what effect reducing the mass of the piston would give. USE THIS AT YOUR OWN RISK!!! This should be used as a guide. If you are serious about setting an increased rev limit, then you should prove the physics to yourself rather than relying on someone elses. Have fun! Piston speed calcs.xls Quote Link to comment Share on other sites More sharing options...
Wez Posted June 21, 2008 Share Posted June 21, 2008 Great work Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted June 21, 2008 Share Posted June 21, 2008 This is what tech should be about now that all the OEM tech stuff has been answered over and again. Quote Link to comment Share on other sites More sharing options...
Steve Posted June 21, 2008 Share Posted June 21, 2008 Nice work Tony Quote Link to comment Share on other sites More sharing options...
simbasupra Posted June 21, 2008 Share Posted June 21, 2008 Great work, must have taken a lot of effort. Quote Link to comment Share on other sites More sharing options...
SimonB Posted June 23, 2008 Share Posted June 23, 2008 Nice one Tony, that will come in very handy... Quote Link to comment Share on other sites More sharing options...
jevansio Posted June 23, 2008 Share Posted June 23, 2008 Can we create a list of the weight of the most commonly used pistons too??? Wouldn't mind knowing my Arias 86.5mm ones Quote Link to comment Share on other sites More sharing options...
Wez Posted June 23, 2008 Share Posted June 23, 2008 Can we create a list of the weight of the most commonly used pistons too??? Wouldn't mind knowing my Arias 86.5mm ones Something Like This Quote Link to comment Share on other sites More sharing options...
jevansio Posted June 23, 2008 Share Posted June 23, 2008 (edited) Something Like This Wow, it's like Blue Peter, here's one we made earlier Cheers Wez Edit, just noticed mine aren't on booooo , will continue to hunt around. Edited June 23, 2008 by jevansio (see edit history) Quote Link to comment Share on other sites More sharing options...
jevansio Posted June 23, 2008 Share Posted June 23, 2008 Arias PDF Here : http://www.ariaspistons.com/ARIA2007cat.pdf 86.5mm 355g 87mm 362g Quote Link to comment Share on other sites More sharing options...
Wez Posted June 24, 2008 Share Posted June 24, 2008 Arias PDF Here : http://www.ariaspistons.com/ARIA2007cat.pdf 86.5mm 355g 87mm 362g Thanks, I have updated the file Quote Link to comment Share on other sites More sharing options...
Ryan.G Posted June 24, 2008 Share Posted June 24, 2008 Glad my Maths lesson's came in handy Tony.... Quote Link to comment Share on other sites More sharing options...
jevansio Posted June 24, 2008 Share Posted June 24, 2008 Can I just ask one more thing, the stock rev limit has been entered as 7200, i thought it was lower than that? Quote Link to comment Share on other sites More sharing options...
Thorin Posted June 24, 2008 Share Posted June 24, 2008 7200 on VVTI, 7000 otherwise I believe? Quote Link to comment Share on other sites More sharing options...
Alex Posted June 24, 2008 Share Posted June 24, 2008 (edited) 7200 on VVTI, 7000 otherwise I believe? Ian's facelift 96 manual data logged a 6850rpm rev limit. Mmmmmm 7800rpm on JUN's without adding extra stress Edited June 24, 2008 by Alex (see edit history) Quote Link to comment Share on other sites More sharing options...
Matt H Posted June 24, 2008 Share Posted June 24, 2008 Wow, looks great, but has gone well over my head! So with 350g pistons you can rev to 7700rpm? surely its not as simply as this? Quote Link to comment Share on other sites More sharing options...
SUPRASUZUKI Posted June 24, 2008 Share Posted June 24, 2008 Wow, looks great, but has gone well over my head! So with 350g pistons you can rev to 7700rpm? surely its not as simply as this? I doubt it very much. Digsy will be along in a minute with a 16 page thesis by way of a full explanation. Quote Link to comment Share on other sites More sharing options...
TLicense Posted June 25, 2008 Author Share Posted June 25, 2008 Wow, looks great, but has gone well over my head! So with 350g pistons you can rev to 7700rpm? surely its not as simply as this? It depends on what you're talking about.... What it says, is that without putting any extra load onto the gudgeon pin, you can rev up to 7700rpm. However, it doesn't say whether everything else in the engine could take that kind of loading. I'm already working out in my head how I can incorporate con-rod loading so that I can calculate the loads in the con-rod bolts, which would be better as this is more likely to be the weakest link. Anyway, what are saying "simple as this". Have you not seen that last equation?! 2nd order differentiations of sine laws are definitely not simple! I put 7200rpm as the stock rev limit as I thought this was the rev limit for the VVTI, which I believe has the exact same bottom end? If that's not right, then I can modify it to suit. Hope that helps! Quote Link to comment Share on other sites More sharing options...
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