Youll need your own and youll need them close and convenient. When performing any work around the valve seat area. With the classic poppet valve style engine, air cannot make a straight shot into the cylinder. Polyquad the future of 4 valve engines motortec magazine. At the end of the day, pocket porting may not produce the fastestlooking set of heads or the most photogenic, but the results can be very satisfying. Usapang mio cylinder head stockhead, big valves, 4 valves. Read on for more details on each cylinder heads along with photos only in 5. Slawko racing heads fully cnc ported ford gt500 heads. The difference between the ported aluminium 2 valve heads and the polyquaded arao four valve heads was 103 hp. Porting cylinder heads allows you to flow more air and unlock hidden performance potential. The five golden rules of porting cylinder heads part 7. To port heads, it takes a craftsmans touch to shape the passages of the head for the most efficient airflow and effective combustion of the fuel charge.
Ford cylinder heads performance upgrades, valve jobs. All our ford diesel cylinder heads are custom built to whatever you want. Holds patents for many automotive performance oriented designs including the highly successful polyquad cylinder head 4 valve design. Cylinder head and porting books page 2 don terrill. Pocket porting refers to cleaning up the port runner area approximately oneinch before the intake or exhaust valve seat. As a result, you can extract significant horsepower and torque gains.
There has to be a bend in the port to accommodate the valve stem and, worst of all, the air must make its way around the head of a valve. For the record, pocket porting heads reworking and blending the seats into the first 2 or so inches of the port is all about focusing on rule number1, to the exclusion of almost all else. Cylinderhead porting basics for the home enthusiast. Get valve seat equipment and a flow bench as soon as possible. This big discrepancy between the two types of heads in terms of power increase for flow increase can be accounted for by the far superior low lift flow of the 4 valve heads. Power tec 10 ep5 david vizards vortec cylinder head porting.
1388 637 351 1108 1346 1135 94 959 1474 1506 717 980 35 962 316 313 1513 1460 1229 830 670 1352 89 1115 1575 1591 513 320 561 449 445 1028 736 925 1381 910 1451 1467 340 109 740 1106 621 1043 633 1499 628 381 742