SK Racing Carburetor

As mentioned in my previous entry I have started getting parts to rebuild my 4G33 engine. I had actually sold the single side draft Weber 40 DCOE that I had been running on the car since since 2008. Not that I had any thing to complain about it, it was an excellent carb and a great all around setup. So initially I had started searching for twin Webers for the new engine setup and it was then that I came across something I did not even know existed.

SK Racing carburetors.

I won't be surprised if it's something most people are not familiar with. From what I can gather about the history of the carb, It was made by Mikuni Corp. (makers of the Solex PHH side draft carb). Development started in 1983 and it was first sold in 1986- a time when the trend was shifting to fuel injection. By the time this carb was available, the market it sought to cater to was all gone. Only a few would have been sold and as such it is very rare.

What the carb is though is very interesting. Being so late in the game, it is actually considered to be the ultimate side draft carb. 'Development' of this carb actually meant taking and combining the best features of the three most popular side draft carbs; the Mikuni Solex PHH, the Weber DCOE and the Dellorto DHLA.

The Mikuni Solex PHH is actually credited as being the best side draft carb of it's time. Being more stable and better able to hold it's tune than a Weber DCOE. But, because of the fact that the carb was phased out and was never as wide spread as the Weber DCOE, parts like jets and venturies are very hard to come by. And a performance carb that can't be fine tuned is pretty damn useless. The huge appeal of the SK Racing carb is that it is basically a Mikuni PHH body, so it will be more stable and hold it's tune well (think; Japanese build quality and reliability) but it uses the easily available jets (air, fuel, pump and idle), emulsion tubes and venturies of a Weber 45 DCOE so fine tuning it is not a problem. On top of that it has the externally adjustable float level and accelerator pumps of the Dellorto DHLA to be able to fine tune it even better than a Weber. So really, it has the best bits of all.

The SK Racing carb was also designed to be sealed and that it can be pressurized up to 16PSI to be used in a blow through turbo setup.

Another good point is that it uses Metric bolt threads. Those familiar with working on Weber (and pretty much anything Italian) will be familiar with the problems brought about by the fact that Italian bolts are neither English nor Metric which makes it a pain should a replacement nut, bolt or screw be needed.

In 1991 SK Racing was renamed to OER Corporation and is still around today... And so are these carbs. Still available new (and unchanged from the SK) as the OER Racing Carburetor at a cost of around US$500 each.

This is the set I got. Twin 45mm SK Racing carbs with a Sanyo SK manifold for a Mitsubishi 4G3x engine. It's a matched pair with a matched manifold.

The only thing lacking is the throttle linkage and velocity stacks but those should be easy to sort out later. I have already thoroughly cleaned and oiled the carbs (the pics were taken in the condition I got the carbs in). I can't wait to get these running with the new engine setup. I can already imagine the induction noise these will make.