Ported and polished AUDI VW SEAT 1.9 TDI head Golf B3 B4 upgrade tuning 1Z 8V
Any head porter will tell you that larger port will give greater CFM measurements, but I as a experienced professional, know that head porting is not only about the size of ports. The most important parameter is effectiveness of ports. Chart shows that, for example, at 1 mm to 2 mm valve lift (very small flow area) ported intake port is 39-33% more effective than stock.This is because of perfectly developed runner shape, valve job and combustion chamber improvement. In the range of 4 mm to 5 mm valve lift, as the port area enlarges, porting effect will fade a little and provide only 8-10% gain. This is because any port, even extremely bad one, can flow at this level of CFM. However, as the CFM rises together with valve lift, runner shape, surface and size start to take effect, resulting in very serious improvement. Your head flows bad (unbelievably well), other head porters in web claim greater (or less) CFM test results? In many year head porting experience I have come to conclusion that flow charts that are not made on one flow bench in identical conditions are not comparable in their absolute values. This is because of many external factors that influence the result temperature of environment, air and test piece, humidity, absolute pressure, flow bench calibration, etc. Similarly internal factors, like shape of piston bore adapters and intake and exhaust flanges (if used), can significantly affect the results. But how to compare those head flow numbers/charts? The porter must provide you with CMF data before and after porting, so that you would be able to compare the gain. There is no value for results only after porting. At first, you should compare the data for flow of stock un-ported heads between different flow benches. This will give you a view on flow bench specific CFM measurements and will help you to compare ported CFM gains. Improvement data in percents based on valve lift values is very informative. What will be the power gain to my car?
Everybody likes to make some claims about horsepower improvement and power gain. But not in this case, as we all understand, that improvement will be individual depending on engine setup intake, exhaust manifolds, camshafts, turbo, ECU etc. , but improvement will be noticeable even on near to stock car, however ported head will give more power gain on already upgraded engines where stock head start to "breathe out". Experience show that stock head limit is something around 230-250HP, if You desire to make more on your project, head must be properly ported.The item "Ported and polished AUDI VW SEAT 1.9 TDI head Golf B3 B4 upgrade tuning 1Z 8V" is in sale since Thursday, May 28, 2020. This item is in the category "Vehicle Parts & Accessories\Car Tuning & Styling\Engine, Tuning & Chips\Performance Cylinder Heads". The seller is "davis_natrins" and is located in Riga, Riga.
This item can be shipped worldwide.
- Country/Region of Manufacture: Latvia
- Manufacturer Part Number: 1.9TDI head
- Brand: VW