port & polish, (pros & cons)

[beetle]

need infos po. tnx.

[ebbfolls]

There are three (3) reasons to port a head. One is to reshape the ports to achieve laminar flow, another is to smoothen the sharp irregularities in the path of the air flow, and third is to enlarge the ports to match larger valves and/or intake runners. Usually, porting also involves the polishing of the ports and the combustion chamber. The reason for polishing is two-fold: one is to enhance airflow and two is to minimize the accumulation of carbon deposits.

For DIY'ers, the porting job should only be limited to the smoothing out of the airflow through the ports, i.e., the rounding off of sharp edges. After the ports are smoothed out, polishing should be done to minimize carbon buildup and to further enhance flow efficiency.

[wildthing]

cons, pag palpak ang trumabaho, maaari niyang mabutas ang engine up to the water jacket

[jeff108]

try matonetics ok dun medjo mahal nga lang

[caps5625]

try matonetics ok dun medjo mahal nga lang

san po to?

[FrankDrebin]

san po to?

Sa Banaue QC bossing. From DelMonte pagkalagpas ng China Town Rest. at bago mag-Chinese na Drugstore (Nakalimutan ko na yung name pero bago mag-Atok st.) Puro China ba?

[speedyfix]

the number one thing to remember here is not to overdo it. there are limitations to the work that should be done to the head depending on what has been done to the engine.

turbo and naturally aspirated engines will need different port work.

[vinj]

Question: will the sought-after effects of PnP still be similar with the newer engines nowadays as compared with the old engines of yesteryear?

[woodfire]

Question: will the sought-after effects of PnP still be similar with the newer engines nowadays as compared with the old engines of yesteryear?

Good Question! With the advent of CNC machining of modern engines, even the lower-end engines are flow efficient already. PnP will be more effective with old engines that require headworks and modifications.

[vinj]

Good Question! With the advent of CNC machining of modern engines, even the lower-end engines are flow efficient already. PnP will be more effective with old engines that require headworks and modifications.

The thought entered my mind since a lot of engines are already manufactured with clean-cut machining done to them. On a side note, in the US, blueprinting and the like gives much more gains with the American engines which are based on old designs and built with looser tolerances unlike the modern Jap and Euro engines.

[CLAVEL3699]

mga how much yung budget for this?

at ano yung mga stages na tinatawag?

[woodfire]

In the U.S. where hot-rodding is an all time fav, installing high performance crate engines is the norm (e.g. Ford Racing engines, MOPAR Power engines, etc.). In assembling the engine, the hot rodder often installs stroker kits, hence would require machining, blue printing and balancing to max out power potential. Its not unusual to see a small block V8 engine generate 500 to 600 horsepower.

Eleanor, the modern version of the Shelby Mustang GT500, has a Ford Racing crate engine, stroker kit, and optioned with a supercharger (for the Supersnake version). W/o the supercharger, it generates 450ph; w/supercharger, 600+hp.