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Originally Posted by jt20
I don't think the crank and rods should be the center of concern. It would be impressive to see you Successfully tap the oil gallery in the block and put in oil jets...
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Having never seen how these things actually work, I can't comment. However, Force Motors in India manufactures a turbo 616. If I had the money to spend, thats what I'd start with.
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Oil pump is the achilles heel here, Its response to oil pressure demand is weak, and its driving mech sucks. If you do get that gallery tapped, your demand for oil pressure has increased and you are going to lose supply to other critical parts .. within a time frame. This will work for a while, but longevity is sacrificed.
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What about using a 5cyl pump?
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The oil is used to extract heat from the pistons, not necessarily to lubricate them.
the head is the other weakness. even if you got a custom cam ground, the valves are not going to let enough exhaust by quick enough and they are going to expand and wear the valve guides. The turbo engines have sodium filled exhaust valves to reduce the expansion.. and I beleive a different size valve.
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Hmmmm... don't know much about this yet. The valves should only expand if EGTs are at unreasonable levels.... unless maybe the friction of higher-pressure, therefore faster-moving, particulates and gasses moving over them causes increased heating of the valve itself? Anyone around here know the feasibility of sticking turbo valves in a non-turbo head? Maybe the best thing to do is just to wait, save the pennies, and start with a Force Motors 616 long block, if such a thing can be had. It would be nice to also get one of their 5-speeds to go with it....