For a bit, I use a high speed steel/milling bit. Very hard but you need to go slow or you dull it out in minutes.
For a bit, I use a high speed steel/milling bit. Very hard but you need to go slow or you dull it out in minutes.
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James Brostek
MARRS #28 ITB Golf
PMF Motorsports
Racing and OEM parts from Bildon Motorsport, Hoosier Tires from Radial Tires
Dumbell plates from Sports Authority work wonders. They are cast out of cheap material and easy to drill. Make sure you use a good new bit for this project though and keep it going slow and well oiled.
I would not go the shot route.
LoBuk ITB CRX Si
2007 NASA H5 National Champion
2006 NASA H5 National Champion
2005 ECHC H5 Champion
I purchased my exercise weights from a second hand sporting goods store. I bought the cheapest plates (four 25# plates) with no brand name on them and drilling through them was relatively easy. We stepped up through four drill bit sizes using a cordless drill and it took no time at all. A couple bolts to hold the plates to the floor and all was good. It seems exercise weights are very much a case of "you get what you pay for." In the case of using exercise weights as race car ballast, it seems you probably want to go cheap.
EP 1990 Mazda RX-7 (used to be STU until the turbo cars scared me away, and STL rotary cars require too much ballast)
ITS/T4 2004 Nissan Sentra SE-R Spec V
10 dollars a 25# plate works for me. cheaper if you shop around. But I was in a bind and having little luck on the used market around here.
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James Brostek
MARRS #28 ITB Golf
PMF Motorsports
Racing and OEM parts from Bildon Motorsport, Hoosier Tires from Radial Tires
Tried lead shot, on the kitchen stove in mom's cast iron skillet... Bad idea!
Later molded a small charcoal furnace out of plaster, used an air nozzle to get the coal plenty hot and melted the lead in small iron crucible. This worked pretty well.
Now we just buy plumber's lead in 25lbs increments, drill and bolt.
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