Hi All, Did Phil Irving really get things wrong? I've searched and read all I can about this (Thanks to all who contribute) I have several questions. 1. The...
... Not often.......... ... Without rereading it, yes, I recall that was his prime reason for a 76 deg phased para-twin, it basically gives maximum average ...
Ian
iwd@...
May 2, 2007 4:30 pm
13395
... Hi Ian, thanks for reply. I guess I didn't ask the right questions (or maybe not phrased correctly?) Anyway, I thought max torque would be at point of max...
Sorry, left out a few things on last reply. the 15~20 degrees should have read max cylinder pressure which will be earlier than max acceleration? The modified...
Peter, I don't know where to look for the modified sine wave which may be shown somewhere I can't find. Is it missing or am I not looking in the correct...
... Peak cylinder pressure is around this 15 deg ATDC point ( depending on ignition timing, comp ratio, rpm and chamber design etc ), and max acceleration will...
Ian
iwd@...
May 3, 2007 12:48 pm
13399
Hi Ken and Ian, thanks for replies so far. Heres link to one set of diagrams. http://www.epi-eng.com/ET-PistnVelAccel.htm I think what I'm asking is, will the...
Doh, just did it again, left a bit out The Phil Irving 76degree keeps the piston accelerating (the way I see it) but a 90 degree re-phase, although being...
... Very good article. What's clear is that I was confusing maximum piston acceleration with maximum CHANGE in acceleration ( the latter being around the 76...
Ian
iwd@...
May 4, 2007 1:57 am
13403
... Bruce maybe ? He's into weird bicycle devices. Cheers IAN See www.drysdalev8.com for : - Drysdale 750-V8 Sports & 1000-V8 Cruiser - DRYVTECH 2x2x2...
Ian
iwd@...
May 4, 2007 1:57 am
13404
Yep Weird Pushys is my go Have you tried the NACC Archieve its a great resource for us cool pushy non pedelers ...
Hi Ian, The graphs were probably not the best example (would have used something with a 1.89:1 rod ratio if I could remember where I saw it) but only to show...
... Which is course it doesn't - lighter crank mass is perceived as more power but chances are the power will be a tad lower due to less than ideal exhaust...
Ian
iwd@...
May 5, 2007 12:46 am
13407
Some people are still allowing themselves to be misled by the higher so called horsepower numbers from a certain brand of inertia dyno and the fact that ...
Thanks both, I'm going to do a couple of Yamaha 650's as they are easier and much, (much,much) cheaper than Triumph's to experiment with. Already have a long...
So lets say I have access to a TZ250 roller for the older parallel twin. And I want to go obscenely fast. What is my best engine, considering power/weight ...
Edward Kunath <edwardkunath@...> Sat, 5 May 2007 22:18:56 ... Home build V-Twin 2T engine made from a pair of old 500MX motors? Aprilia SXV550? I've been...
... I've seen an Aprilia 250 with RG500 motor squeezed in. Very nice job, a bit like this one http://www.isk.kth.se/~isk_joan/Aprilia_RS500.htm Otto...
oooh tasty project! If you like 2-smokes how about a CR500 or one of the other huge, now illegal dirt 2strokes, like KTM or Husqvarna. Would that be 80 hp? The...
... thats an EX500 to the US right? 70 hp possible and very cheap to buy. Not surprised at what you say about the 650... ... and the Husqvarna single in that...
does anyone know of a good domestic (US) crankshaft finisher that works on one-offs? i am working on a billet one piece crank for the single and can do the...
... Who builds the motor ? ( ATK buy them all in don't they ? ) Cheers IAN See www.drysdalev8.com for : - Drysdale 750-V8 Sports & 1000-V8 Cruiser -...
Ian
iwd@...
May 7, 2007 12:55 am
13421
I think Maico developed it for European sidecar cross originally. Find out who now owns Maico and you'll probably find who makes it PJ...
... The Maico 751 may have been used in sidecars, but was originally developed for the then open class ( 750+cc ) in the ISDT. At that stage, BMW had it to...
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