Turbo Hookup????????????
Thanks for that information, Bill. Detonation is the killer, alright. I think Tom was very conservative with ignition timing (something like 18 degrees total mechanical advance,) and he MAY have mofidied his carb for "blow-through" usage (richer moxture) to stave off detonation. I think I read where he used 21 pounds of boost to achieve that 12-second run.
Still, that's an impressive performance for an otherwise stock engine, I thought..
The slant we did was a 1972 model from California which had different emmission standards and was rated at only 105 HP. It was all stock at first witht he Buick turbo, but when the car was driven hard it would peg the temperature guage. One night when it happened we popped the hood to see that the exhaust manifold was slightly orange from being extremely hot. The emmission Rochester carb was very lean and not suited to our purpose so we put a Holley 750 on it which cured the problem. As we kept increasing boost thogh it would detonate at times so we added a lever switch under the secondary actuating pushrod. As soon as the secondaries opened up even just a little, the switch would close and trigger a windshield washer pump in a seperate tank that held a 50/50 mix of water and methynol. The mixture ran through a hose up under the air filter and sprayed into the top of the carb. Since there was only 1 hole into the intake manifold, we didn't feel that cylinder to cylinder distribution would be an issue. It really helped alot. Eventually though the boost was raised to 15 PSI and the engine couldn't take it anymore. It burned the center 2 pistons down the sides pastt he rings. I believe that those 2 cylinders were getting the most charge due to their shortest length. If I do one of these again, it will be with an aftermarker intake or a homemade unit. Nice thing about that Holley, even though it was very big for this engine, it never hessitated or bogged at any point. I believe that the mixture got well dispersed as it went through the compressor wheel. Bill
Thanks for that information, Bill. Detonation is the killer, alright. I think Tom was very conservative with ignition timing (something like 18 degrees total mechanical advance,) and he MAY have mofidied his carb for "blow-through" usage (richer moxture) to stave off detonation. I think I read where he used 21 pounds of boost to achieve that 12-second run.
Still, that's an impressive performance for an otherwise stock engine, I thought..
