The ARP studs use hardened ground washers for an accurate torque reading.
The ARP nuts are snugged down.
The head studs are torqued to the proper value in a cross pattern in three steps.
Next, the cams are put in place and the valve clearance is set via select fit lifter buckets.
The oil pump and new pan are now installed.
The timing gear and front cover are installed next.
10 comments
i had always heard that Nissan engines, particularly the RBs, were underpowered in comparison to how robust they were. Those days, apparently, are long gone when we get 500+ HP out of bolt-on upgrades.
Any downsides to the narrow rod bearings?
Less surface area to maintain the oil film so less pressure needed before getting bearing wear. Good oil flow and pressure can somewhat mitigate it.
Very nice article, really accessible, will there be updates?
Also, I couldn’t help wonder, was there any discussion about the downpipes getting coated? Did any other goodies get thrown in “since you were in there anyway?”
Been a reader since SCC and still miss that magazine!
Other than the PC9 coating on the pistons, the parts were kept mostly stock. This was a customer car and they just wanted their car back. Though it may not seem like a lot was done, the total gets up there pretty quick thanks to the GT-R tax.
Great write up guys. Just to add some context:
The original motor was stock with about 90k mi on it, most of which was spent with the boost up for WOT on E85. It was not in fact bad gas that lead to failure but rather an accidental downshift at WOT which resulted in a low RPM load on the OEM rods. If that had not happened, my guess is the engine would still be alive. That tune had a reduction in torque as mentioned in the article. But even with the motor build, that mistake should not be repeated. if you have a GTR – don’t let that happen!
The owner just dynod the new setup and the results were impressive with the stock turbos. The head work appears to have netted a consistent gain in TQ across the rev range; but more impressively the peak TQ RMP was lowered by over 700 RPM’s down to 3,500 RPM’s.
Great build guys. Hi Howard, Mike and Martin.
I’ve really loved all of these modification articles / videos on the project GT-R. I was wondering if you would be making a video comparing the modified car’s performance to a stock car? Maybe quarter mile, 0-62, and a few laps on a track or Auto-X?
I think it would be really great to have some sort of benchmarking so that owners will know how the mods improve the car in more sure terms.
Thanks,
The car came here with a windowed block so no before!
could you be so kind to share you piston to wall clearance along with main and rod bearing clearance. this seems to be a very secretive issue when it comes to building a vr38 motor for about 1200hp or so.
We don’t give that information away either. Its part of our engine building service.