machanic
Active Member
Anyone try the 2 stroke wizard software or know if it is any good?
It looks ok but I'm not going to pay 35 bucks U.S. to only be able to use it twice in a 365 day period as per the piracy statment attached states.Anyone try the 2 stroke wizard software or know if it is any good?
Well thats good to know,There are many free software programs available now that I've not used just because of the time envolved in checking their validity I'm a little ocd that way and have to know that the end result is correct so I stick with the IWT Racing one that has proven to concure with manualy doing the math.The earlier version is available free!!!
Well thats good to know,There are many free software programs available now that I've not used just because of the time envolved in checking their validity I'm a little ocd that way and have to know that the end result is correct so I stick with the IWT Racing one that has proven to concure with manualy doing the math.
It looks ok but I'm not going to pay 35 bucks U.S. to only be able to use it twice in a 365 day period as per the piracy statment attached states.
Nice info. I'm going to have to remember this thread so I can resource it later. Are the lengths your giving from the piston face to the mean reflection point in the diffuser?These values are a starting point for proper pipe length (tunned) to the engines actual exhaust port timming and rpm.
First we need to know the exhaust ports open duration in degrees.Messured from deck to top of window.We'll start with the stock generic or older 38mm stroke and 85mm (short) rod @ .7 crown to deck.
height of window druration wave speed rpm length
28mm = 140.66 x 1,700 divided by 8,000 = 29.89"
27mm = 147 .48 x 1,700 8,000 = 31.33"
26mm = 154.10 x 1,700 8,000 = 32.74"
Now since I've yet to see a stock exhaust port higher than 26mm that should cover it,So we will move on to the stock 40mm stroke 89mm rod (long) also @ .7 crown to deck height.
28mm = 149.99 x 1,700 8,000 = 31.87"
27mm = 156.21 x 1,700 8,000 = 33.19"
26mm = 162.29 x 1,700 8,000 = 34.48"
Now we can look at a modded generic or older 38mm stroke and 85mm (short) rod @.7 crown to deck.
25mm = 160.54 x 1,700 10,000 = 27.29"
24mm = 166.84 x 1,700 10,000 = 28.36"
This is as far as I will go here since I can't recomend going above 24mm due to loss of torque.
We will now look at a modded 40mm stoke and 89mm (long) rod @ .7 crown to deck height.
25mm = 168.25 x 1,700 10,000 = 28.60"
24mm = 174.10 x 1,700 10,000 = 29.59"
The rpm used here is not the final rpm rather the peak rpm before power starts to fall off the rpm may still climb above this point depending on the type of pipe used.Next we can look at the chamber area's and cone angles to help determine the best style or type suited to the aplication. I will try to get to that soon as this takes me awhile to put up here LOL.
Yes exactly that.Nice info. I'm going to have to remember this thread so I can resource it later. Are the lengths your giving from the piston face to the mean reflection point in the diffuser?