Ported and polished AUDI VW 1.8T 20V 4cyl head. Professionally ported head for street and race applications, for Turbo or NA engines. Bare engine head without valves, valve springs and retainers. Ported, corrected and polished inlet ports Standard head, average intake runner cross area is 1208.4mm. After porting average intake cross area is increased to 1525.3mm. Intake port is increased in all its lengths, all unnecessary sharp corners, steps and edges are corrected to design even and perfect port shape, modified intake near the intake flange. Port shape and design is created based on experience, flow data experiments and direct back-to-back engine tests. Intake port flow increase is in all valve lift range, but the greatest effort is concentrated on two head porting basic excellent low valve lift flow and ultimate CFM flow numbers on great valve lift range. Result is shown in Intake gain % chart. Flow increase compared to stock small port head is tremendous – up to 44%. Head porting provide respectable 21% increase in flow capability even compared to stock big port head. Ported, corrected and polished exhaust ports Standard head, average exhaust cross area is 926.1mm. After porting average intake cross area is increased to 1253.4mm. Exhaust port is increased in all its lengths. Close side radius is improved and exit of the port near the header flange is rounded and matched. Special attention is focused on exhaust port surface finish, therefore surface is almost mirror-polish, that gives better exhaust flow and dont allow exhaust waste products to burn on exhaust port walls. Exhaust port flow increased compared to stock head is significant and similarly to intake greatest effort is made on low and maximum valve lift flow. Polished and corrected combustion chamber, chamber walls matched to cylinder diameter, smoothened out all sharp edges and pockets. Combustion chamber modifications, not only increase port flow, but also improves engines resistance to detonation. Vitally important is material removing near the valve seats to increase low valve flow even more. Grinded and shaped valve seats to increase air flow (each valve is vacuum tested to ensure perfect valve seat lock). Valve seats are prepared for stock or oversize (+1mm) valves. New OEM valve guides. Ends of the valve guides is shaped to achieve smooth air flow near the valve guide area. Heads are milled for flatness and surface finish. Head porting is provided partly on CNC (intake, exhaust sides and near the valve seats) surface is finished by hand to give the desired surface smoothness. Heads are pressure tested twice before and after porting with 6 bar pressure to detect any possible cracks or leaks in head. Combustion chamber is in stock volume. For additional cost it is possible to change heads combustion chamber volume to provide needed compression ratio. It is possible to reduce cc volume (for NA applications) or increase CC volume (for Turbo applications), but typically it is necessary in some special hybrid or stroker engine applications. It is possible to provide the head with stock size valves or new oversize valves. As well as lightweight valve retainers and stiffer valve springs. For additional cost it is possible to assemble the head with camshafts and chain tensioner. This ported head is suitable for. AUDI A3, S3, A4, A6, TT. ADR AGN AMK APP APT APX APG AEB AGU AJL AJQ ANB APU APY AQA ARZ AUQ AWT. VW Golf, Jetta, Bora, New Beetle, Passat, Polo. ADR AGN APT AEB AGU AJH ANB APU ARZ AUQ AVC AWT APG. SEAT Ibiza, Leon, Leon Cupra, Alhambra. AGN AMK APP AJH AJQ APG. What do I get? You get a completely remanufactured and professionally ported and polished head. It will be cleaned, tested and inspected for any damage or unacceptable wear. Price is for bare head without valves, valve springs and retainers. What kind of valves do I need to use? There are two possible valve job solutions for this head: One is a valve job for stock size valves so that any stock-sized valves will fit perfectly VAG OEM, Supertech, Ferrea e. Second option is that we prepare head for oversized valve application (+0.5mm or +1.0mm valves). Flow numbers shown in the listing are with stock sized valves. Can I send you my head as a core and will I get a discount for that? But keep in mind that before accepting your head we will inspect and pressure test it to make sure that the overall condition satisfies our zero-failure requirement. What is big port head and small port head? Originally VAG produced two types of 1.8t 20V heads with small intake ports and large intake ports. Exhaust ports for these heads are almost the same. We sell large port ported head. Will my intake manifold fit for ported head? If you have small port intake manifold then it will be no match for your new ported head. The large port intake manifold is “the worst of acceptable” solutions as the intake runners in the head will be larger than stock un-ported intake manifold. Therefore we recommend porting of intake manifold. Any aftermarket custom made large runner intake manifold is acceptable. Is the head suitable for any piston bore size? Yes, but we need to know that, as in porting of head touch to details is very important. Therefore we need to port and resize combustion chamber to ensure that shape is perfect and there is no unnecessary “steps” or pockets in combustion chamber. I don’t understand “Intake/exhaust gain ported vs stock %” chart, what does it mean? It shows CFM gain in percent, not in absolute values, as it is the best way to represent the porting gains in all valve lift range. For example, at 9 mm valve lift intake improvement of ported head CFM is 34% compared to small stock and 116% compared to large port stock head. What can I comprehend from percent charts? 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 20-25% 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 9-11% 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”. Ported head definitely will improve turbo spool up at low RPM range. The item “Audi VW 1.8t 20V Golf A4 TT K04 S3 AEB AGU PORTED CYLINDER HEAD 1.8 Turbo p&p” is in sale since Sunday, December 17, 2017. This item is in the category “eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Cylinder Heads & Parts”. The seller is “davis_natrins” and is located in Riga, Riga. This item can be shipped worldwide.
- Brand: AUDI VW Seat
- Manufacturer Part Number: AEB
- Interchange Part Number: EMT_1.8t
- Surface Finish: polished
- Warranty: Yes
- Country/Region of Manufacture: Latvia