We have just received an SR20DET for an engine overhaul.
Thank you for choosing Naprec.
We’ll turn this engine into something very special!

We’re working on making a big throttle for an RB26DETT.
Recently, there have been many cases of damaged throttles for RB26DETT’s.
Especially cases where the resin collar inside the return spring has deteriorated and has broken.

We are enlarging the inner diameter of three throttles from 45mm to 49mm.
They will also be getting a wet blast finish.

We are building a dry sump oil pan for an SR20DET.
Can’t show too much, but this is what the inside looks like.

We have had many cylinder head repairs recently.
Today we’re working on cam line burn repair and cam cap production line boring, sweet stuff.
We’ll continue with several more after this.
On the left is the original, and on the right is the completed product, love the shine.

Precise balance correction of a Copen JB-type crankshaft was done today.
A 4 cylinder for a Kei car (Japanese category for small cars) is very special, they are typically 3 cylinder cars.
This crankshaft was produced by casting.
Cast iron cranks are particularly great as they barely bend at all.
We always check to make sure there is as little distortion with the balance as possible.

This time we treated the final surface treatment with manganese phosphate, this reduces sliding resistance and reduces wear.
The image shown is the result of the surface treatment.
After this, we will work on polishing the journal.