The Indianapolis Star from Indianapolis, Indiana • Page 35

THE INDIANAPOLIS STAR MONDAY, MAY 26, 1971 PAGE 36 FLAT TIRE BLAMM) FOR RURNEW PISTOX Offer ends May 3 1,1975 Dallenbach Falls Out Of Pear Tree 0)o 111 I 1 1 "We UUULTLiL-JLLrU rod broke and Sammy Ses-' sions stalled on the course. And then there is always; the contemplation of a would have broken if the re-1 maining 26 laps had been run. By GEORGE MOORE For want of some air in the tire the race was lost. Wally Dallenbach was sitting in the pear tree at the Speedway yesterday before he went out of the race on the 163d lap while in the lead. Dallenbach burned a piston in the new Drake-Goossen-Sparks engine due to having to run part throttle with the left rear tire going flat.

"HE HAD TO RUN part throttle," said chief mechanic George Bignotti. "That dumps the fuel and leans the engine out. "It's already red hot and it When you buy any new 1 974 rotary-engine car equipped the way you like it. other drivers who either fell by the wayside or tested the Speedway's concrete retaining walls for hardness. Johncock started off the mechanical failure contingent when the mag quit.

He was followed in sequence by Lloyd Ruby with a burned piston and Salt Walther with turbo-charger bearing failure in his No. 77 car. Larry McCoy fell victim to a burned piston, while John Martin was out with a broken fitting on the radiator. Mike Mosely lost his engine, Both Bobby Allison and Johnny Parsons gave up after their transmissions failed. ROOKIE ELDON Rasmus-sen developed a leak in his fuel system when an "0" ring failed.

Tom Bigelow bumed a piston, as did Jerry Grant. Al Unser had a real engine problem when a connecting builder Harry Miller, and racing engineer Art Sparks. What Bignotti wanted was an engine which would breathe better and hence possess better fuel mileage characteristics and horsepower. It was achieved by reducing the valve angle and improving the intake and exhaust porting. A supplementary benefit occurred via the water capacity being increased when the shallower valve angle raised the top deck of the head and increased the interior water jacketing area.

The intake ports on the DGS go virtually straight into the combustion chamber instead of up and over a hump as with the Offy. THE EXHAUST ports flow out in a gentle curve. As a consequence, the fuel-air flow has less restriction getting into the combustion chamber and the expended gases after combustion have less restriction getting out of the chamber. Yesterday's action gave proof that it's the way to go as Johncock out dragged pole man A. J.

Foyt and his Foyt V-8 to lead the race until his magneto failed. Dallenbach is fully convinced he would have won if he hadn't encountered mechanical failure. "I have no doubt that I would have won," Dallenbach said, "if it hadn't of burned down. '1 wasn't worried about the fuel. There just was nothing on the track that was as strong as that machine out there today." DALLENBACH HAD lots of company in the woe is me department.

There were 19 range which upset the critical fuel-air balance. "I wasn't running as fast as I could have," Dallenbach said. "I was running 181. 1 could have run as fast as 184, but I had to drop to 179 and it killed me. "As long as we could race the engine in the way for which it was designed, it never would blow." The four-cylinder engine used by Dallenbach and Gordon Johncock in the Sinmast Wildcat machines are newly designed power plants which are an advancement over the time-proven Offy.

BASED AROUND the design concepts requested by Bignotti, the four was a joint project of Offy manufacturer John Drake, racing engineer Leo Goossen who prior to his death last year went back to the days of car and engine 2 Gary Trackmen Battling Injuries Gary, Ind. Two of Gary Roosevelt's best Larry Johnson and Derrick Burnett qualified for Saturday's State Finals track meet at Indianapolis North Central but both are handcuffed by injuries. Johnson, a :09.5 sprinter in the 100, sprained his ankle roller skating the night before last week's regional meet. Burnett who placed in last year's state hurdles hasn't recovered fully from an injury suffered earlier in the Indianapolis Tech Invitational. just fried the piston." With the rubber going soft, Dallenbach was forced to ease back and it got the DGS pow- CASH REBATES ON RX-4 HARDTOPS" erplant out of its racing CASH REBATES ON RX-4 WAGONS CASH REBATES ON RX-4 SEDANS r7jzr.

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