by 106-1194218389 » Fri Dec 05, 2008 12:21 pm
On this engine we had an Okrasa stroker and 90 mm bore to get thicker cylinders. We had small block Chevy Crower rods. Of course we had good case inserts to give the more area to hold the studs in.
On the heads, we made a special fly cutter to do a circular bevel cut so it would be similar to a Hemi but with squish. We had special pistons made to match the head. Welded the ports up both intake and exhaust to move the ports some.
We had a VW Vertex Mag on it. We made a starter that we could just twist to lock in place, start the engine and then remove the starter. The mag was locked at full advance and that turned out to be a problem as we blew the heads and cylinder up right in my face. I was very lucky and did not sustain permanent damage to me, although I could not hear crap for a week. That prompted us to make a mechanical retard for starting and then once started cranked back to full advance and that solved the problem. We also made a girdle to squeeze the heads and help them stay on.
The first time we ran the dragster we spun the flywheel off. If you are familiar with the air cooled VW you know they had one big gland nut and dowel pins to hold flywheel on. We ended up having heat treat removed from crank, machining the flywheel end to accept a bolt on crank flange. We welded the flange on and ground the crank. Then we went it back and had the heat treat redone. They did not offer bolt on flange cranks at the time.
Trans was a late model bus one with the removable bell housing. We made a special stainless steel input shaft that was longer so we could move the engine away from the trans so we could suck the tires in closer to the frame rails. We had to make a special tube to run between the bell housing and trans for the extension. Then in the trans we used Webster gears, like Hewland Trans dog clutch gears. We modified the dog clutches by grinding the front edge straight vertical and a bevel on the trail edge so we could shift full throttle no clutch but as long as we had power applied it would stay in gear. Had a small block Chevy valve spring to shift trans. Would cock the trans and slide a small slider plate under the mechanism to hold in low gear. We had a pneumatic shifter we made using a solenoid to pull the slide out when we hit the trigger and it would shift full throttle no clutch. It was a two speed. The trigger mechanism was just that, a trigger setup from a CO2 BB gun. And our air bottle was a CO2 cartridge. It lasted two runs.
We won Best engineered car at that Bakersfield race where we set the record. I think it was 1977. Things sort of melt together when you get older.
John