Is that an actual RWHP?
From your plot, looks like you're expecting at least 140% VE.
That's like having a blower with 6 psi boost...
... That is not 140% VE
Not even within smelling distance of that.
...I only quote in flywheel numbers...
"My theoretical simulator uses ideal lossless adiabatics " What? where can I find info on that.
...If I needed more power I all I had to do is not shut off.
YesI am a newbie with a question for the members that have Mikes Big bore 750 kit from Heiden Tuning. Can you kick start this puppy with the high compression? Well any way higher than stock.. I am asking because it looks like Mikes Big bore (Big Fin) 650 kit comes with standard pistons and I am assuming stock compression.
Yea you can kick it ok, just have to kick a bit harder. i bored one of mine to 770 and there probably is a few more horses but top speed stays about the same, pulls like a train, but i would not do another big bore, i would much rather a six fifty, smoother and it doesnt shake to bits.......How much HP do you pick with that 750 big bore kit?
On a side note, the 78 xs650 has a better power-to-weight ratio, then my 92 883 did. So cool, wasn't expecting that. You guys probably already knew that though.
Cut and install GSXR1100 tapered wrist pins to reduce vibrations or get custom tool steel wrist pins.Yea you can kick it ok, just have to kick a bit harder. i bored one of mine to 770 and there probably is a few more horses but top speed stays about the same, pulls like a train, but i would not do another big bore, i would much rather a six fifty, smoother and it doesnt shake to bits.......
Re. vibration and piston weight, let's correct a couple of inaccuracies that have crept into this thread here and there. First: forged pistons are heavier than cast pistons for the simple reason that forged aluminum is denser than cast aluminum, which is also why forged pistons are stronger than cast pistons, which is also why performance pistons are forged and not cast.
But heavier big bore pistons won't necessarily cause more engine vibration than stock. The smoothest XS650 motor I ever owned or experienced had heavy 77.5 mm. Venolia forged pistons on a stock 360* crank--no expensive rephase work, crank reweighting, etc. The motor was smooth because we paid attention to the basics. First, we used a very true crank--no measurable runout at the journals, and only .002" runout at the flywheels. Second, pistons were matched for weight on a precision beam balance.
Heavier reciprocating mass puts stress on the bottom end,may not be a street concern but I'd much rather have lighter pistons combined with LW pins. It's possible those heavier pistons corrected the balance factor too. JSmotorsports who sells JE pistons for his long rod Norton engine packages,his pistons average over 100 plus grams lighter than stock and run so much smoother than a stock Norton engine without re balancingRe. vibration and piston weight, let's correct a couple of inaccuracies that have crept into this thread here and there. First: forged pistons are heavier than cast pistons for the simple reason that forged aluminum is denser than cast aluminum, which is also why forged pistons are stronger than cast pistons, which is also why performance pistons are forged and not cast.
But heavier big bore pistons won't necessarily cause more engine vibration than stock. The smoothest XS650 motor I ever owned or experienced had heavy 77.5 mm. Venolia forged pistons on a stock 360* crank--no expensive rephase work, crank reweighting, etc. The motor was smooth because we paid attention to the basics. First, we used a very true crank--no measurable runout at the journals, and only .002" runout at the flywheels. Second, pistons were matched for weight on a precision beam balance.