I understand that Colin....you missed my point. Read the guy's ad on the website. Let me quote again: "This engine based on the type 1 VW engine produces an incredible 200ft lb + Torque and with 85 Horsepower driven through our Helical Gear Drive...." This guy claims the motor makes the power AND THEN it's fed through the gear drive, or at least that's the way the reader can be lead to believe. One thing I have learned in the engine building business is that guys that can do, do. Guys that can't, claim to perform miracles. Remember, this is the same outfit that claims to be able to "solve" all the crankshaft woes of the corvair engine. That's funny, with the exception of a few, I didn't know they had any woes to solve. If his gear drive is a 1.6, since he claims prop speed of 2750rpm, that means he is producing his power at 4400 engine rpm. At a 1.6 reduction, with his claimed 200 ft/lbs of torque, he would have to be producing 125ft/lbs of torque at 4400rpm, which equates to 104 hp at 4400 rpm. By his own admission in the ad, he's only producing 85hp.
Bottom line is this: His math don't add up. And for that reason, in my mind, he can't be trusted and I wouldn't buy his products. Nothing personal, Colin. But I hope you can understand my point of view. --- Colin Rainey <brokerpilot9...@earthlink.net> wrote: > Scott > One correction you have to make to your numbers is > the fact that you are figuring everything direct > drive, not taking into account torque multiplication > through the gear drive. Torque ends up multiplied > by the factor of the reduction. This is how turbo > prop engines make such big numbers with such small > power plants. They are set up on something on the > order of like 16 to 1 or 20 to 1. 50 foot pounds of > torque at the shaft is multiplied by the gear > reduction by the percentage reduction, ie: 16 x 50 = > 900 foot pounds at the prop. This is like the PT6 > Pratt & Whitney engine, that can be turned down from > its 1500 hp max, to around 400-600 for other > applications ( Saratoga hop up conversions). So a > VW making 60 hp and 85 foot pounds of torque through > a 1.6 to 1 reduction drive would make 60% more power > or 136 foot pounds of torque at the prop. Just food > for thought. More info in Richard Finch's book on > auto engine conversions.... > > > Colin Rainey > brokerpilot9...@earthlink.net > EarthLink Revolves Around You. > _______________________________________ > Search the KRnet Archives at > http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to > krnet-le...@mylist.net > please see other KRnet info at > http://www.krnet.org/info.html > __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com
