NAPREC Weblog

Monthly Archive:Sep 2017

日産GTR VR38DETT CylinderHead

Sep 29th, 2017

We’re working on a VR38 cylinder head today.
This time we’re going to do some CNC porting and processing the CNC combustion chamber.
The crank shaft has been rebalanced, and the valve seats will just get a cut, but we’re sure it’ll be a great finish.
I can never get tired of looking at these engines…


TOYOTA 2JZCylinderblock

Sep 25th, 2017

Several Toyota 2JZ’s have been assembled.
Many billet crankcaps are also being processed.
We want to get all these out by the end of September, so we have our work cut out for us.
Still have to make those dummy heads for the blocks, gotta kick on the turbo!


Lamborghini Diablo V12

Sep 23rd, 2017

We’re working on fixing up this guy today, the Lamborghini Diablo V12 cylinder head.
This engine had a cam line failure, and we’re going to be making new caps for it.
The image shows the engine about to undergo line boring. Since the diameter is small, we’re being extra careful with this one.
The thrust surface also looks banged up, so we’re going to fix up the end face as well.
We talked about cam caps in an oder blog, but they’re made through designing them in 3D-CAD and CADCAM, then cutting them out.


PORSCHE911 Cylinder

Sep 21st, 2017

Today we’re working on the inner diameter of the air-cooling cylinders for a Porche2.7. We’re honing to adjust the piston clearance.
At Naprec, we also work on honing Nika Gill cylinders, so we do this type of work on occasion.
We perform the honing by creating a dummy head and crank case and joining them together.

Pretty much all cylinders of Porsche air-cooled engines have nicadil plating treatment with the exception of a few models.
Nicadil plating is a process developed by the company Mare.
The plating has excellent harness and is also a great oil-containing surface. It is an ideal plating option for internal combustion engines and is also able to be processed directly on an aluminum surface.

I would like to alter domestically produced engines to aluminacadylate.


Mini Engine

Sep 20th, 2017

Today we are looking to adjust the valve timing for a MINI1000, a type of engine we work on very often.
This particular MINI has a 280° profile.
The cam shaft looks like it would be a lot of fun with a large working angle and lift.
We don’t get to work on cam shaft profiles very often, I wish we could do more of these.