Hauler Driver and Cylinder Head Maintenance
- Feb 14, 2011
- Orange Ca
Yes, we would rebuild the engine, service the blower and put a new clutch pack in every run. My job on Jim Dunn's car was building and servicing the cylinder heads. When I started there, they were using AJP stage-6 heads, but we changed to stage-7 a couple of years later. I will never forget when I walked into the shop one day in the off season right before Christmas and big Jim with a smile as big as Dallas said my Christmas present was in my cylinder head room. I opened the door and there was a pallet with about $60,000 worth of new stage -7 heads and all of the new valves, keepers and fuel rails to change over from the stage-6 heads. I always started the season out with 14 heads in the head cabinet in the trailer ready to bolt on. When we would get to the track, I would pull 2 sets out of the cabinet and put headers on them and 1 set would go on the car and the other set would be sitting on a pan at the end of my cylinder head table. After each run a crewmember on each side of the car would pull their head off and bring it to me and put the other set back on the car after the bottom in guy was finished installing the new pistons. While all of this was being done another guy was putting a new clutch pack in. As soon as the heads were on my table, I would pull all of the valves out and check the valve spring pressure and put new exhaust valves in and check the stretch on the titanium intake valves and if they were in our spec range then they went back in for the next round. If the tune up needed changed I would change the fuel nozzles before the heads went back on the car also. I would throw the exhaust valves in a box and would recut them as much as 3 times before throwing them away unless they were burnt and then I would just give them to fans. If we didn't burn a head up, I would rotate the same 2 sets on qualifying days. If we did burn one up, I would just pull another one out of the cabinet and then when I got the time, I would strip it down and send it out to get welded and machined. If it was too far gone, I would just throw it in the junk pile back at the shop. On race day due to the small amount of time between rounds I would just pull out a new set every round we went and didn't service any heads until I got back to the shop or at the next track if I didn't go back to the shop. I usually would stay out for 4 to 5 races and have stayed out for 6 but that is really cutting it close on parts.did you rebuild the engines between passes, ND?