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Rb25DET Neo Head Machining + upgrades

LjB123

By LjB123,
in R Series (R30, R31, R32, R33, R34)

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LjB123 Enthusiast

LjB123

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Hey guys. Need to get the head machined, as a leak down test showed some major leaking coming from the exhaust valves in cylinders 5 and 6. Im looking at upgrading the cams, valve springs, and they will replace the usual little bits and pieces as part of a head refurbishment. Any other things I should do while the heads off?

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https://www.sau.com.au/forums/topic/485226-rb25det-neo-head-machining-upgrades/
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Duncan Grand Master

Duncan

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Posted

cnc valve seats and clearance the head for big cams?

It kind of depends which head you have, and what your current/potential future plans are.

Any idea why the valves are leaking? Have you ever had a timing issue?

LjB123 Enthusiast

LjB123

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On 24/1/2024 at 7:48 PM, Duncan said:

cnc valve seats and clearance the head for big cams?

It kind of depends which head you have, and what your current/potential future plans are.

Any idea why the valves are leaking? Have you ever had a timing issue?

Didnt want to go for bigger cams. If anything, wanted some drop in Kelfords. Not chasing huge power figures, already has 400hp at the wheels, and don’t wNt to go much more than that, as i want it reliable and a fun street weekend car for cruising around and enjoying

No idea why theyre leaking. Recently purchased the car and previous owner didnt even know the compression was bad on two cylinders, he only drove it occasionally, putting only a few thousand Km’s on it the past few years, as he also had a R32 GTR to drive on weekends. Starts up and runs fine

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