Tomei Valve Guides for 4B11 Mitsubishi Evo X (TA309A-MT02A)




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Tomei valve guides for the Evo X are crafted to manage the 4B11T engine's high horsepower and RPMs. Utilizing Phosphor Bronze (Cn-Sn-P alloy), known for its high tensile strength and superior heat transfer, is crucial for engines operating at high power and RPMs. Today's race engines require increased power and RPMs, resulting in elevated temperatures that hasten wear on valve train components. Phosphor Bronze provides low friction, maintaining optimal clearances to alleviate stress on the valve train and prevent seizures and cracking under heavy loads.

Vehicle Fitment:
2008-2015 Mitsubishi Evolution X (4B11T)

16 valve guides (8 intake valve guides & 8 exhaust valve guides)

More Info:
Considering the product's application in challenging environments, regular maintenance and periodic inspections are essential. It may undergo accelerated wear under certain conditions. Examples of such conditions include:

  • The rocker arm type assemblies will apply more lateral pressure, which will increase the wear rate. If the stem wall of the valve is rough, it will also contribute to the increased wear rate.
  • Using high lift, aggressive camshafts will also increase the wear rate.
  • Excessive buildup of carbon will also hinder performance and increase wear rate. When there's a small opening at the end, it will increase the carbon buildup rate as a funnel effect.
  • The results from Valve Spring surging will cause the Valve to move on an angle. This will cause both ends to open up and create deformation. Then carbon can enter the valve guides more which will increase the wear rate.
  • A defective seat cut. When the seat cut's centerline across the main 45 degree face is offline from the valve stems centerline by more than 0.01mm, this can cause increased abnormal wear rate.
  • If the clearance is not within the correct 0.03-0.04mm range. The Valve will rub against the guides inner wall, this degree angle in relation to the seat cut will cause it to shift by 0.01mm more than the clearance values. The guide will take the lateral pressure point and open up the opening. The buildup of carbon will increase in the newly formed gaps.
  • A worn out used Valve. It's possible to cut down by using the part that has not worn out the stem when changing to a high lift cams. The guides can wear out when the inappropriate clearances are made. (About 0.01mm out of clearance).
  • The Valve design is defective. The difference from the dilatability and the guide being worn out abnormally is when the valve that is made with different alloys, will contribute with a faster deterioration.

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