Thread: Dyno-Sim combinations

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Originally Posted by rollie715

Richard, Thank you. I was a little surprised to see the HP numbers that low, but very pleased to see the torque numbers in the rpm range you show. My goal was to build an engine with good torque and run on cheap gas and I think this will fit that goal. For a street driven car, I think I would be very happy with that kind of performance.

You have to remember that the L31 heads have only a 170cc intake runner, so they're more of a torque head than they are a horsepower head. We could have made more horsepower with more SCR and more cam, but I sensed that you wanted an easy street-driver. Don't worry, it'll nail you back in the seat.

Be very, very careful checking the interface between the heads and the intake manifold to insure that they are parallel in both X and Y axes. If the port is gapped open at the top, you will have a vacuum leak that you can normally find with ether or other flammable spray, but if the port is gapped open on the bottom, the cylinders will be pulling oily vapors into the cylinder from the crankcase and you'll never find the leak with ether. I suggest sacrificing a set of intake gaskets on the mock-up build and closely inspecting them for being "pinched" all the way around each and every port. If not, further machine work will be necessary to make them parallel in X and Y.