L.S.Racer

You can achieve 240 mph but a reccord would be out of your reach. Go to a El Mirage meet. A couple of guy's run a similar set up as you want they are nice and will awncer all youre questions. One guy is from Japan and the other is local.

B.S. The car will always spin between 166 to 172. That is unless you add atleast 350lbs plus driver. You should get your spedo checked.

The Z will creat lift at around 170 mph and with a lach of mechanical knowledge you need alot bigger budget, closer to 150k. But good luck.

Thank's for the response. If you dont mind I would like youre opinion on my situation and thought. I am installing a turbo fuelinjected inline 6 in my '73 240z. The cowl induction theory wont be a performance robing issue in my eyes. Now I believe that the induction could only ocur at lower speeds but even then the known positive pressure (high pressure area) in the engine compartment wouldent allow this. Most cars with cowl induction hoods have a small or almost no grill, unlike the Z. The reasoning I am left with is, if the cowl isn't so great (large) to cause to mutch turbulence at the windshild the added volume to the engine compartment (from the raised center portion of the hood ie. cowl). And with the aid of the Bernoulli principle and posiably some reduction in the front grill. Then it will creat lower pressure in the engine compartment and give down force as the air is pulled out and over the car. As well as limit air from traveling under the car. The air under the car has more pressure than the air going over the car, making the air take the path of least resistance up and out. After all it is known that if you leave the hood unlached on a Z the hood will rise. This can't happen if youre induction theory is correct. In the case of a 240 Z I think there is somthing else going on. Looking forward to youre response, Thanks. It is all for the greater good of the Z.

A comrad of mine went to cosworth to posiably buy one. Not sure the size but he normally uses 4 cylinder engines. They wanted 50,000 for a long block!!!! Ant those eaisy to find parts at 24,000 for a crank, I'd imagine there still on the shelf waiting for a sponser to come along. If someone did put a cosworth in a Z it would be awsome

My opinion on your cowl hood dilema is the understanding of it. I view a cowl to give a greater amount of volume in the engine compartment lowering the pressure. This is similar to limiting the air flow in while creating more downforce. With the rear of the cowl opening moderately close to the windshield, you will allow the air to exhaust over the car creating downforce. It would be impossible for the cowl to allow any backflow into the engine compartment or under the car. It is the same theory that creates lift for a airplane wing. When air flows around a object that has a larger surface area on the top than the bottom, the air on top has to speed up to meet back up with the air going under it. The faster moving air creates a low pressure area creating lift. This faster moving air pulls out the air in the engine compartment. This can be easily demonstrated by blowing compressed air across a full water bottle at about a 45 degree angle. Anything in the bottle will be sucked out. Hope this helps you.