ORIGINAL: supertib
ORIGINAL: GYNAIKAS
In my opinion a .21 of 1.5hp comming out at 42+k rpm will be faster than a .28 of 2.3hp at 25-28k rpm. The .28 at 40k don't forget that such engines produce less than 1.5 hp at max rpm cause they are mid-range engines. And their max rpm point is far away from 42+k rpm.
wrong !
remember RPM range of motor will only matter if both are running equal gearing..... as soon as you gear up the 28 its game over for the .21.............2.3 Hp wins over 1.5 HP, it can do more work, and can push a car to higher MPH........... HP over RPM range any day........
And if calling my modded Picco a midrange motor LOL !!!!! with proper gearing you wont find a .21 thsat will push MPH like my Picco 28.... 2.3 HP and 86.5 oz/in of TQ.......................a Hand modded On-road .21 makes 40 oz/in and 1.8 HP......... Guess which motor can pull a bigger gear set ????? we arent talking track racing here, we have no concernrs with traction, or infeild performance ( heres where the .21 shines) we are talking all out MPH.............. throw the proper gear behind the .28 and the .21 gets assraped every time...only a moron would think a Honda V-6 can push a car to higher MPH then a Chevy LS2..i mean the Honda V-6 revs higher, but the Vette motor makes more power.... which has a higher top speed ?
Well I can easily prove my claim by using simplified mechanics but I wont. If you try something like that you'll discover 2 basic things:
1)There's not such a "wide" gearing to adjust the .28 engine's powerband equal to the .21 engine's.
2)If you work out the force coversion due to gear ratio you'll see that the torque that ends to the final gears is almost the same for the .28 and the .21 too. But .21 can give you 10k rpm more than the .28 plus the fact that the racing .21 keeps producing maximum power for a longer rpm range, especially near the top end that you'll need for your top speed.
Pico is a monster of power and I think it's very hard to find a place to do 70mph more than 2seconds (no offence friend but it's hard for me to believe 80mph out of the box for any car), so it's more than you'll ever need but in my opinion and "mechanicaly" speaking .21 will have the job done easier.