RB25DET Valves

Discuss the RB20, RB25 and RB26 series engines.
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thenillaz
Posts: 545
Joined: Sun Jan 21, 2007 7:33 am
Car: 92 240sx Hatch

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Just wondering, not much covered on this, what are the stock rb25det valves made of? Are they made of the same material for the 26 and neo?

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Darius
Posts: 4820
Joined: Sun Mar 02, 2003 9:48 am
Car: RB25DET S14 - 665 WHP (SOLD)
Location: Chicagoland

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I have read that they are inconel which is a steel similar to stainless but with better high temperature strength.
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thenillaz
Posts: 545
Joined: Sun Jan 21, 2007 7:33 am
Car: 92 240sx Hatch

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So a motor could probably handle higher egts from modifications without needing the valves to be replaced with a higher quality metal then huh?
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Darius
Posts: 4820
Joined: Sun Mar 02, 2003 9:48 am
Car: RB25DET S14 - 665 WHP (SOLD)
Location: Chicagoland

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Sure to a point. The main reason valves are replaced (besides being a dip$hit and breaking them yourself) is because of their larger head diameter and/or the better flow design on the back side.
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