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Hello,
Today I tore down my modded B20 which had developped a water drinking habit over the last week. It has B21 pistons, ported big valved head, 4/1 header, programmable injection/ignition, the works...also an expensive but not satisfying Kent fast road cam.
The engine barely has 13000 km on it, of which some 650km of track use.
What did I find...
The headgasket (93mm Elring 'turbo' gasket) wasn't really blown. I saw were the water leaked into the cylinder by the rust marks. It proved to be badly centered around the bores, it should be 1.5mm more in the lifter gallery direction. But this required adjusting the holes where the head bolts pass through, and off course they didn't do that when the engine was put together.
Sad enough the cylinder wall of the water drinker has some rough spots which I hope I can have honed away at the machine shop.
The other 3 Cylinders were perfect, not a scratch, a real example of how an engine should be.
This wasn't the case with the wonder cam, every bloody lifter had serious pitting in the center as had the cam lobe tips. The engine always ran on quality oil which was changed every 2500km. The valve spring pressures where well within limits and the rev limiter was always set at 6300 rpm.
This really p.. me off, I know that those engines are prone to cam failure, especially when cheap cams of unidentified origin are used, but not a 450 dollar cam/lifter set of a known cam manufacturer. I will have the hardness of this piece of junk tested and am curious about the outcome.
When I get the block sorted it will be build up with a KG6 cam with KG lifters,
A highly modded head and KG 4/2/1 header. Anyone on the board that has experience with the KG cams ? Rumor has it that Enem cams are VERY similar ;-)
I hope there aren't going to fall more corpses out of the closet when I tear down the rest of the block.
Best regards
Stefan
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