Floor Vs Ceiling Porting Cylinder Head

The short sideask top cylinder head porters if there s much to the short side turn the part of the port where the floor turns in toward the valve and you may just hear it s all in the short.

Floor vs ceiling porting cylinder head.

Cylinder heads as manufactured are usually suboptimal for racing applications due to being designed for maximum durability ports can be modified for maximum power minimum fuel consumption or a combination of the two and the power delivery. In addition he expects to maintain mid 30s mileage while tooling down the highways and byways of this great nation. 516 s have a flat intake port floor and the 915 s have a nice radius that i believe helps the mixture make a nice laminar flow transition as it makes the bend to the valve pocket. Cylinder head porting has been an over used term for the last 20 years and despite all the words written about this process you can t go more than 10 minutes with any group of hot rodders before someone uses the term port and polished which merely reveals their ignorance on the subject.

Allpar s own bob o neill is assembling a 2 2 turbo engine for his 86 daytona c s with the goal of hitting over 200 hp at no more than 12 psi of boost. The objective of porting a cylinder head is to improve engine performance via constructive enhancements to the intake and exhaust flow paths. Using a saw head cuttaway and clay i am designing the amount of material needed to close up the port and raise the roof of the exhaust port to gain major. Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve their air flow.

Before you get to this point however it s important to determine the rpm range of the desired power band and how you want to shape and position the torque curve to best suit your final application once you determine what you need and what you re. Here is an area where there is a tremendous amount of potential for success and also failure. The combination of a raised floor and expanded walls helps to get the job of filling a cylinder done when the port and valve is feeding a hemi style chamber or is one of a pair of intake valves in. Transfer port the transfers are good at their original event duration so there is no need to mark those.

The head work great on the 13 1 c r. Engine with excellent power and torque through out the entire operating range when i started working on a couple other sets it dawned on me that the intakes needed to have the floors raised and the roof of the port heightened to straighten the runners to the valve bowls.