Originally Posted by demented
I am thinking about building a blower motor after years of using big cube nitrous motors. What I am looking for is some advise on what size cubic inch is a good starting point. 454,505,540,572..... can't decide. This is my first attempt at a blower motor on alcohol but I do have years under my belt as far as tuning alcoho goes so thats not an issue. Just never played with a belt. I do want to start at a reasonable level but without breaking the bank. I am thinking that I want to start at a 496 ci and go from there. Any info would be appreciated. Again this is just a first attempt so I don't want to build the best money can buy type of motor. Kind of like a science project.Also any tips that can help build this motor along the way. Thanks guys in advance.
Advice...
1. There is no replacement for displacement, to a certain point. Keep your stroke at or below 4.5". Blower motors, for whatever reason, don't like more stroke than that.
2. Keep at least .250" worth of cylinder wall in the block to keep it from distorting.
3. Gotta double key that crankshaft.
4. Do a blower hub, not a balancer.
5. There's NOTHING wrong with steel rods. Don't let anyone tell you different. (Oliver or Carillo that is)
6. Gear or belt drive over timing chain.
7. Gas motors, 8 or 9:1 compression. Alky 11.5:1.
8. Buy the best blower you can afford. The more efficient the blower, the cooler the intake charge. The cooler the charge, the more power it will make.
Off the top of my head those are the biggies.
Honestly though, right now, if I didn't already have everything I'd be building a turbo motor, especially if you're going to run a street or 10.5 tire class. The turbos are so much easier to control the power on than blowers.
There's my buck fiddy.