Most reliable hp from stock bottom end
#3
Not sure what you consider "reliable" so...
There is no data to firmly back this up, but I think that the generally accepted notion is that around 250hp (and probably a bit lower) is "reliable." Granted there are people who have made more than that and are okay, but you asked for reliable, not who has made the most hp on the stock bottom end. Just for reference, a long time miata vendor sells their basic kits set at around 220hp or so and they tend to error on the side of safety as they don't want customers blowing their engines.
Remember, there are other parts of the car that may need upgrading around that level as well such as the diff on 1.6L cars, tranny, brakes, cooling system. Also the 99-00 were rumored to have weaker rods, but never substantiated, could be b/c they are slightly higher in compression?
There is no data to firmly back this up, but I think that the generally accepted notion is that around 250hp (and probably a bit lower) is "reliable." Granted there are people who have made more than that and are okay, but you asked for reliable, not who has made the most hp on the stock bottom end. Just for reference, a long time miata vendor sells their basic kits set at around 220hp or so and they tend to error on the side of safety as they don't want customers blowing their engines.
Remember, there are other parts of the car that may need upgrading around that level as well such as the diff on 1.6L cars, tranny, brakes, cooling system. Also the 99-00 were rumored to have weaker rods, but never substantiated, could be b/c they are slightly higher in compression?
#4
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The rings start to lose life expectancy above 250rwhp, and at 300hp your tranny is on borrowed time. There are guys who hit 300rwhp on stock blocks, but they don't do it for very long. I would say that 250rwhp is probably the upper limit of stock block longevity.
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