Stayer. Porting the cylinder head. Stage 4.
Hi friends!
In this topic I want to talk about the work with the cylinder head. Earlier, in its various topics, I mentioned that doing a big project 4G69 (N/A). The planned capacity of at least 100 HP per liter volume. I think it will be more. When I assemble the entire engine, I will write a separate topic. And give links to threads, where and how were these or other work.
To obtain such power, it is necessary to modify almost all the parts.
In this topic I will talk specifically about the cylinder head.
I had a spare cylinder head. With this head and started work.
http://s019.radikal.ru/i621/1607/07/c6b3636a0bc9.jpg
I want to remind you, I don't understand English. Write with a translator. If you do not understand some words, ask, I'll try to find another explanation.
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Initially, we need to understand what we're working with. For this we need to examine the cylinder head on the flow stand.
http://s018.radikal.ru/i506/1607/e5/5f67bdba5259.jpg
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I want to say. What 4G69 cylinder head very high-tech. It shows good results with purge flow test. Its performance is much higher than the 4G63 or 4G64.
I also did the spilling oil. It is necessary to understand the degree of compression. The volume of the chamber is 51 cm3
http://s018.radikal.ru/i510/1607/06/f4ad64263bd2.jpg
Previously, the cylinder head is thoroughly washed.
http://s017.radikal.ru/i408/1607/22/0c041bea9000.jpg
Now, the task is to increase the capacity of valves at the inlet and outlet. In this place the plugging. If you do only the increase in channels, will be of little avail. It is necessary to increase the size of the valves and seats.
Stock valves:
intake 34 mm
exhaust 30.5 mm
The same size valve has a Evo 9. I think can add +2 mm for this size.