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Originally Posted by civickiller
first off. the compression ratio is a set number, you calculate compression ratio by measurments of certain things. you can calculate compression ratio without having to pump air into the cylinders. a turbo just puts compressed air into the cylinders making for more air, hopefully more fuel, so it makes mroe power.
second, invest in something that holds compression. you sort of make it sound like boosting a car and the head lifts off. alot of people boost on the stock motor and do it safely and effectively. with just a jrsc i dont see the need for headstuds and a better headgasket. but he may need new rings.
for the rods, he said hes willing to put $1500 in it, rods and pistons will come under 1500, shit it will come out to like 800. and the rest he can use to pay someone to built the motor.
and for the pcv, i dont know much about that so no comments on that except that i dont think its going to throw a CEL because on my pcv i dont see any sensor attached to it. he could put a catch can on there if he wants to
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I agree that the compression ratio remains the same. But the actual pressure with the cylinder actually goes up with any forced induction compared to NA engines. Yeah, you're are probably correct that the cylinder head will not blow off with a simple JRSC, but if you are taking off the head anyways, then I would replace the head bolts and the head gasket to something better than the stock. Although the OEM parts might handle the increase in pressure fine, they are only designed to work with the factory spec. I would replace the above mentioned for my sake. And once again, I really don't think there is a reason to replace the pistons and the rods. As long as they fall under spec, then it should be fine. I don't know what you pay for a rebuild, but where I live, it is bit more than $700 for a complete motor rebuild from a reputable shop.
Catch can does not do anything other than catching oil and liquid residue. D16's already have breather chamber and it acts as the catch can anyways. Larger PCV will relieve more pressure from your crankcase, hence easier on your oil seals and gaskets. But if your PCV valve that is tied to the intake is too big, then you can actually create some what of a vacuum leak, and make the mixture lean by introducing more air to the intake. This will throw cel. But normal performace PCV valves should be alright.