Subject: Re: Biggest ports on Nissan L4 from factory!!! by D on 2023/5/24 12:46:48
Sorry my bad forgot to put YD22DDTi and YD25DDTi engines, which are diesel and share most of the design with the QR, except the inlet valve mechanism.
This super sturdy diesel engine is the same engine as the qr and pr but cast iron to run the higher diesel compression and stresses of added boost.
Allows a 2.5L turbo version using the PR25DD head to easily outflow the 4g63 and VW 16v For a budget build use the YD25De block with QR25DE crank, yd22 rods, QR25DE pistons Stock pistons are capable of 500hp with quality tuning as proven by altima owners. Over that 500hp will need forged rods and pistons which are available off the shelf.
As a comparison to Toyota 1ar-fe 2.7L beast
This is the Toyota 1ar-fe 1000hp pappadakis world drift championship winning engine
One can see the head is much taller using Honda borrowed design than direct cam actuating like Nissan keeps using on the PR25 and the Pappakis billet set is over 2k usd where the Nissan PR head can remain untouched in this areas saving $$$ for cams.
