Recent content by VADUS

The only important caveat is that Igor is using the old crappy tractor twin‑scroll Garrett turbo from the Safari turbo kit for the 1HZ — hence his sad torque/power graph after 2000 rpm. I always told him that this turbo is complete garbage, but he didn't believe me until recently, when that...

So, my friend and neighbor Igor followed in my footsteps and implemented the split intake manifold and swirl flap project on his 1HD‑FT. Unlike me, Igor really loves measuring the results of his mods on a dyno, which gives us a chance to see the real benefit of this modification in numbers. And...

I have shown this oil system modification with a red dashed line on the stock 1HD‑FT oil supply diagram. In the original design, oil was supplied to the common circuit from only one side, but now oil is fed from both ends of the same circuit. This increases pressure in the area of the flute...

It depends on the situation. If the 1HZ is due for a rebuild or it suddenly locks up, the work involved in rebuilding a 1HZ or converting it to a turbo 1HD‑T/FT is pretty much the same. The crank is identical — you either replace it or grind it. Oversize turbo pistons are available. The 1HZ head...

Some points in favor of the 1HZ: An inline‑6 is always better than an inline‑5, because a 6‑cylinder is perfectly balanced, while a 5‑cylinder is not. The 1HZ has more torque and HP [than the 1PZ]. If you ever decide to, you can fairly easily convert your 1HZ block into a 1HD‑T/FT/FTE. However...

On these Toyota diesel engines, even a slight upward deviation of the needle from its normal position (usually just below the middle of the scale) indicates an overheating issue. In addition to all the cooling system causes mentioned above, one should not overlook excessively retarded injection...

The photo shows oil pressure readings on the rocker shaft in the area of cylinders 1 and 2, measured by Den more than 5 years ago, when he first implemented the additional lubrication system for the flute on his 1HD‑FT. In fact, it was the installation of the additional oil supply line that...

A few more photos from the outside. Two years ago we relocated my oil filter to the frame — where the fuel filter was originally mounted. It was also replaced with a much larger one from a big truck.

Naturally, new cam bearings with grooves cut into them, a new flute, gaskets, etc. were installed. In parallel, we discovered the reason for my engine's sluggish performance and rapidly rising EGT under maximum load — the injector nozzles were worn out after 270k km; the second and sixth...

All three flaws are elegantly solved by Den's modification: An additional independent oil gallery is fed to the head, taking oil from the filter, where the line diameter is twice that of the stock gallery in the block. As a result, pressure drop in the stock block gallery is practically...

First interesting detail: everyone knows that the oil gallery to the 1HD‑FT head has no restricting orifice (unlike the 1HZ and 1HD-T engines). However, the oil line coming out of the head through the 6mm hole in the rear journal cap feeds the rocker shaft through a 3mm hole in the shaft itself...

Continuing with Den's topic — he implemented his own solution for upgrading the lubrication system for the rocker shaft and camshaft on my engine. I decided to do this many years ago — right when I saw how Den did it — and now I finally managed to combine this modification with the scheduled...

As for the split intake in this particular project — it produces an interesting result, especially for those who have already implemented a twin-scroll setup. Given that both the exhaust and intake manifolds are split according to the firing order, and both are divided into identical groups...

Not necessarily the Hot Vee, but it is the best example. Traditional V6 engines also have configurations with independent intake manifolds — like the Nissan GT-R VR38DETT. Unfortunately, inexpensive mainstream V6 models don't have a split intake, and the exhaust is also often merged into one...

I can already make some preliminary conclusions about fuel consumption in city driving with the split manifold and the flaps engaged. The effect is not just noticeable — it's very significant: after filling the tank to the brim, I reach the first quarter mark on the factory fuel gauge with about...