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Biggest ports on Nissan L4 from factory!!!
No life (a.k.a. DattoMaster)
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2002/10/28 6:49
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The New QR25DE engine is called the PR25DD and yet nothing changes
with bottom end just a massive change in the head to catch up with
the Toyota 1AR and 2AR with the same cigarette sized box ports

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Posted on: 5/5 10:06

Edited by D on 2022/5/5 14:55:26
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Re: Biggest ports on Nissan L4 from factory!!!
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Ah, the new Altima engine

Used in Nissan Altima, Nissan Rogue, and Mitsubishi Outlander

Quote:
A new 2.5L 4-cylinder direct-injection engine (PR25DD) was developed for use on the new 2019 model year Altima as a successor to the QR25DE engine


The world’s first application of a resin intake port improves anti-knock performance. The resin port is inserted into the intake port cast in the cylinder head, thereby forming an air layer between the intake air passageway and the head inner wall so as to suppress the rise in intake air temperature

* mirror bore coating (a la the GT-R engine)
* Direct injection
* variable valve timing control (Nissan VTC) system
* cooled exhaust gas recirculation (Cooled EGR)
* integrated exhaust manifold
* variable displacement oil pump

Attach file:



jpg  Mechagodzilla cylinder head.jpg (193.38 KB)
174_6276db8609e88.jpg 1600X1066 px

jpg  integrated exhaust manifold.jpg (86.06 KB)
174_6276db90e6f39.jpg 1200X732 px

jpg  VVT.jpg (144.73 KB)
174_6276db9beb3fd.jpg 1310X908 px

Posted on: 5/7 21:50
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Re: Biggest ports on Nissan L4 from factory!!!
No life (a.k.a. DattoMaster)
Joined:
2002/10/28 6:49
From on my stationary Earth @ 0 km/h
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Looks like a nice head for boost for a cheap SR20DE bottom end
as the SR crank fits the QR but the SR is still a closed deck
and sand cast block thicker than pressure die cast.
This head would make an SR 10-12kg lighter using boost as no
need for a heavy turbo manifold, no need for porting just take
out those new worlds first resin insert thinga me bobs

Posted on: 5/12 9:43
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