Backwards pistons?
#1
Backwards pistons?
ok so im pulling the head off of my 86 crx si with the d15A3 in and I noticed something a little odd. Well the D15A3 has a 12 valve head, meaning 2 intake valves and one larger exhaust.
Well on the pistons there are only the two notches for the intake side on one side of the piston.
the weird thing is that the notches are on the exhaust side of the block. so that the valves and notches dont wouldn't even line up.
Yet the engine runs fine and has for 213,000 miles (3,000 boosted :P)
I thought maybe i had a engine put toghter on friday, but i looked at another D15A3 in my shop and sure enough its the same way. And im about to pull the head off of another 86 crx si and i want to bet it'll be the same.
anybody have an answer for why the pistons are like this? or wether or not i should rotate them to match correctly?
Well on the pistons there are only the two notches for the intake side on one side of the piston.
the weird thing is that the notches are on the exhaust side of the block. so that the valves and notches dont wouldn't even line up.
Yet the engine runs fine and has for 213,000 miles (3,000 boosted :P)
I thought maybe i had a engine put toghter on friday, but i looked at another D15A3 in my shop and sure enough its the same way. And im about to pull the head off of another 86 crx si and i want to bet it'll be the same.
anybody have an answer for why the pistons are like this? or wether or not i should rotate them to match correctly?
#3
Re: Backwards pistons?
I would guess that it was an assembly line glitch. if you know the VIN's I'd check those to see if they are close in numbers. I'm surprised it ran though. Your ever redline your's (valves get pretty close then).
#5
#6
Re: Backwards pistons?
yea, so i pulled a head off of the another 86 si and guess what, same thing.
can I just rotate them? the aroows on the pisotns would be poitning toward the front of the car if i fasted them correctly
can I just rotate them? the aroows on the pisotns would be poitning toward the front of the car if i fasted them correctly
#7
Re: Backwards pistons?
Originally Posted by flyviper69
yea, so i pulled a head off of the another 86 si and guess what, same thing.
can I just rotate them? the aroows on the pisotns would be poitning toward the front of the car if i fasted them correctly
can I just rotate them? the aroows on the pisotns would be poitning toward the front of the car if i fasted them correctly
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