Tomei Genesis Complete Head 4G639CH - Phase 1 - RHDJapan

Tomei Genesis Complete Head 4G639CH - Phase 1

TOMEI SKU: 64572 PN: 233020
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The TOMEI Genesis Complete Head 4G639CH - Phase 1 is a Complete Engine Head, very popular for swapping into the original 4G63 due to the extra power and torque that can be benefited from the extra optimization of the combustion chamber along with the fact that it is a Tomei engine head.

The TOMEI Genesis Complete Head are built by their highly skilled team of mechanics. The engine head will be put through a series of tests to make sure that this motor will be a good candidate for further modification. The engine head will then be cleaned up and prepared for modification and engine work.

Upon purchasing please state the car from the compatibility list that you would like to have the TOMEI Genesis Complete Head for.

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Brand: Tomei
Product: Genesis Complete Head 4G639CH - Phase 1
Part Num: 233020

FEATURES:
Building Process:
1 - VALVE GUIDE REPLACEMENTS:
We heat the cylinder head up to 200 degrees C. to extract the stock valve guides. The difference in thermal expansion will allow an easy and safe removal process of the valve guides without damaging the head. Then we again heat the head prior to installation of the new Tomei valve guides. The Tomei valve guides are frozen to -200 degrees C with liquid nitrogen. So the total temperature difference of 400 degrees C will ensure the absolute best installation process, without the risk of damaging either the head or the new valve guides. This is how we also achieve the best seal and seating of our valve guides.

2 - LARGER DIAMETER VALVE SHEET RINGS:
When upgrading to oversized valves, larger valve seat rings are required. Just simply enlarging the seats to accommodate the larger diameter of the valve is not enough. Long term durability and optimized flow is all taken into account. New seats are cut, and both the intake and exhaust ports are corrected for improved head flow.

3 - VALVE SEAT CUT:
Each valve seat width, position and taper angles. The surface condition is checked and addressed to maximize the aerodynamics from the intake to the combustion chamber, and then out through the exhaust. Each seat is cut to suit each valves position and tapered angle. The surface angles and positions are all arranged to optimize overall flow. By increasing the sealing properties of the valve to valve seat, then more accurate compression can be maintained. This process is extremely time consuming, to find the optimum design for the engine and its application.

4 - OPTIMIZING THE COMBUSTION CHAMBER:
The valve seat rings surrounding area may have some imperfections from the factory. This can affects the combustion chambers volume and performance. So by targeting this area the flow can be optimized to maximize the already limited area. Deburring casting imperfections from the port to the seat rings and smoothing this area is an absolute must. Extra care and attention is taken into account for the airflow and dynamics of this area.

5 - PORT STEP CORRECTIONS:
Correcting the valve seat rings helps optimize the combustion chamber shape and makes the flow characteristics much better on the intake and exhaust side.

6 - VALVE SPRING SETTING & ADJUSTMENTS:
The valve springs will need to be upgraded to help keep a good balance for both low and high engine speeds. The added weight reduction will greatly help the valve train assembly. The key points are to set the correct load properties of each of the valve spring and also with the weight reduction factored in. The valve length extension is then checked to measure the correct valve seat cut required. Then the correct valve length is set with the use of the valve spring sheet adjustments. This process will increase the valve springs design efficiency which also means that the load is then set.

7 - VALVE LAPPING:
A special lapping compound is used to lap the valves and the seat rings to correct the sealing and contact areas of the valve with the seat ring. The correct adjustments can then be made to optimize sealing, to prevent any gas leaks. If the area is too large then there is a risk of grime or carbon buildup, this can then damage both the valves and seats, which will hinder performance. If it's too narrow, the high stress loads on the seats will reduce cooling efficiency as the heat cannot dissipate into the cylinder head effectively.

8 - HEAD SURFACE CORRECTION:
The head is checked for any signs of deformation, and then corrected with the mill cutter to make the appropriate corrections. This will increase the heads plane to improve sealing characteristics, with a secure flat face to met well to the cylinder block. Having corrected the face of the head will help increase compression and deliver more power.

9 - CLEANING THE HEAD:
The entire head is meticulously cleaned. Both the water and oil galleries and every orifice is cleaned by hand with various tools. Then it is finished off with a high pressure hot washing machine and then high pressurized air cleaning. Passing these 3 heavy processes, the head will come out looking brand new. An extensive check of the head will be done next, and the casting errors will be removed by hand.

10 - COMBUSTION CHAMBER CAPACITY ADJUSTMENTS:
Large valve seat rings are fitted and adjusted. The valve seats are then cut and finally the combustion chambers are carefully calculated and adjusted to suit the target displacement on each cylinder. All Genesis engines have their cylinder compression chamber ratios all adjusted to suit the target volume. Meticulous attention to detail and precious adjustments of 0.1-0.9cc is normal in our standards to attain the optimum results.

11 - PRECISION ASSEMBLY:
Our staff is always striving for perfection. So precision assembly is always first priority on our work methods. This is why we have been around since the late 60's and still going strong. Our materials, equipment, work environment and management are specifically design to show in our end products results. Only with our strict standards is how we can achieve the high levels of standards that Tomei Powered is well known for.

SPECIFICATIONS:
Base Engine Type: 4G63
Combustion Chamber Volume: 43.9 (Approx.)

Tomei Installed Parts:
Valve: 1mm Oversized
Valve Springs: Oval Core Shaped
Valve Springs Retainers: Titanium
Valve Springs Sheets: SPCC
Valve Guides: Phosphor Bronze
Valve Seat Rings: STD

OEM New Parts:
- Cylinder Head Assembly

COMPATIBILITY NOTES:
- Base Engine: 4G63
- Application: Lancer Evolution IX GSR/MR
Compatibility is from maker for JDM cars only. We don't guarantee fitment. Always do your own research before purchase. After-sale support does not include installation support.

Mitsubishi Lancer Evolution IX CT9A 4G63 (03/2005-03/2007)

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“ THE CUSTOMER'S VOICE ”

RHDJapan Store Reviews

Have been using these plugs for long time. Truly worth the investment for race use.

The parts were of excellent quality and the fitment was perfect!

Nice finishing on the emblem, put at my FK8. recommended to buy.

Nice finishing on the emblem, put at my FK8. recommended to buy.

Nice perfect with my J'S Racing blue gear knob.

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