Stayer. Porting the cylinder head. Stage 4.

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stayer
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Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:23

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.
Image

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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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:25

Initially, we need to understand what we're working with. For this we need to examine the cylinder head on the flow stand.
Image

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:26

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
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Previously, the cylinder head is thoroughly washed.
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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.

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:27

However, there are a few problems.
For example at the intake valves. The distance between the saddles more than 6 mm.
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It's all good, can make a +4 mm. However, on the other side of the valve is really bad.
Image
In the picture where the screwdriver is. This place is not to increase more than 1 mm.
Even if you increase more than 1 mm, then this place is not the movement of the air flow.

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:28

The same problem with the exhaust valves.
Image
So. The maximum that can be supplied is +2mm intake, +1.5 mm exhaust.

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:29

First, remove the seat.
Image
Image

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:30

New seat mounted with an interference fit.
Image
Image
As you can see, the size of the saddle a lot more than internal size.
After installation of the valve seats, it is necessary to cut the working chamfer. At a certain angle. For example, here is a video as to cut the chamfer. It's a different cylinder head (4G63). But the meaning is the same.
http://www.youtube.com/watch?v=WYqOQGiKnyY

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:31

After the valve seats. Need to find new valves. I originally planned to install the valves from car Honda NSX. Inlet 36mm, exhaust 32mm. But these plans had to be abandoned. These valves are not the same length. They are much smaller.
I've been looking at different catalogs from different manufacturers. Ultimately bought the prefabricated. From Ferrea.
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Ferrea Competition Plus Valves have built a reputation as the industry's most reliable extreme duty valve. To manufacture the valves we use special aerospace quality alloys, including the EV8-Z18, which provides high tensile strength. An exclusive two-step slow forging process ensures proper grain flow and virtually eliminates any damage to thematerial structure. The valves are then heat-treated and stress-relieved over a 48-hour period, which is the crucial base of our molecular integrity. These valves feature avionics-quality hard chrome along with a specially applied hard tip.

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:32

Final length is measured after full preparation. For example, the measured length of the stock valve.
Image
This length takes as a starting point 0.00
Next, measure the new valve
Image
As you can see in the photo, the length is longer at 0.211 mm
Further, the end valve grind 0.00

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:32

I also want to say. The thickness of the stock valves 6mm. New valves intake also 6mm.
Image
And the valves on the exhaust have a smaller thickness. 5.5 mm
Image

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:33

Next you need to pick up and replace the bushings valves. To do this, use the bronze bushings from Honda. Bronze better heat dissipation than cast iron.
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To the left of the Honda, right stock.
Since I do not plan to greatly increase the engine rpm (maximum 7200 rpm), I leave the springs stock. For exhaust valves decreased the thickness of the valve stem. Therefore we must find new retainers. I also use Honda.
Image
Stock
Image
Honda

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:34

In the area of the 4th cylinder there is a channel of exhaust gases for the EGR. I disconnected this valve software. This channel should be mute. It will not heat the cylinder head. This will allow you to use a plastic intake manifold. It will also give a more even flow of gases from the 4th cylinder.
This is undercut in the body of the channel.
Image

Next is plugged.
Image

In the future, all the projecting parts are ground down.

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:35

After replacing valve seats and bushings, it is possible to broaden the channels for intake and exhaust.
Image
Image

However, it is impossible to mindlessly increase the channels. The intake channel has just such a form
Image
If you just increase (expand) the input. The fall in the rate of air flow. Therefore, the form should remain as shown above.
Image
Image

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:36

Now the Assembly can start.
Image

In General, everything seen in the photos
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Image
Image
Image

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Re: Stayer. Porting the cylinder head. Stage 4.

Post by stayer » 14 Jul 2016, 16:37

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