92-93 pistons
#1
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92-93 pistons
So, I go to www.seriesoneperformance.com and check out pistons and find that 92 and 93 have different pistons available. I know that the rings are different, but when I asked DrJay about it he tells me 93'* will work in a 92 but will change the compresison ratio. I haven't got around to asking why. I suppose the compression ring (top one) is at a different height. Anyone know if it'* higher or lower? And what was different about the engines to keep the compression ratio the same between the two despite the ring difference?
#2
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Ring height does not change compression.
Increasing or decreasing combustion chamber size or piston domes does.
I suspect, but can't say for sure, that the compression went up in '93. One point in compression is worth about 2% in horsepower and about 4% in fuel mileage, and GM was hurting for CAFE improvements that year.
Increasing or decreasing combustion chamber size or piston domes does.
I suspect, but can't say for sure, that the compression went up in '93. One point in compression is worth about 2% in horsepower and about 4% in fuel mileage, and GM was hurting for CAFE improvements that year.
#3
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However, compression is usually lowered to compensate for an increase in boost.
So if the boost increased in 93 (although I'm uncertain if it did) then I would liken the compression was decreased.
So if the boost increased in 93 (although I'm uncertain if it did) then I would liken the compression was decreased.
#10
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I thought the chamber might be a possiblity. So, when I put the 93 heads on, will it affect my compression? That is the real important question here. Will it go up slightly because the chamber is just a little smaller? How far did the top ring move?