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Going for 500+hp, need advice


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On 12/23/2021 at 11:12 PM, Ben C34 said:

A new nismo engine is a bit different to a 200 plus thousand k engine though.

Sure, but the difference between 10W-40 vs 5W-40 is going to be near zero at operating temperatures and at cold start the oil is going to be far thicker than what it would be at operating temperatures as well.

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On 24/12/21 at 11:26 PM, GTSBoy said:

Cold oil pressure is key to preventing a lot of unwanted engine wear. You would be surprised how much wear occurs in the first few minutes off operation, every time it is started cold.

Because it takes 30secs for the oil to move around the engine.

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On 12/24/2021 at 2:26 AM, GTSBoy said:

Cold oil pressure is key to preventing a lot of unwanted engine wear. You would be surprised how much wear occurs in the first few minutes off operation, every time it is started cold.

Wouldn't you want a relatively thin oil for cold start? I thought that was the whole point of this multigrade oil thing.

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Balancing act between the more simple hydrodynamics and the annoying things like film strength. It's about achieving the best possible bearing performance as fast as possible. Local minimum of one function superimposed on the local maximum of the other.

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On 27/12/2021 at 7:46 PM, joshuaho96 said:

Wouldn't you want a relatively thin oil for cold start? I thought that was the whole point of this multigrade oil thing.

You would want thicker actually as a dead cold engine would have higher tolerances than a warm one.

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