turbo joe
01-13-2004, 12:25 AM
...but it seemed that this was the most apporopriate place to ask a DOHC question...besides, you can't swap a real "ZC" legally in CA.
I just got done swapping an '88 D16A1 shortblock into my '87 CRX that has (had...blew a rod last week) an '87 -A1 motor in it. I couldn't find a decent early shortblock. I was sweating a little about whether it would work or not, because Honda lists different headgaskets for them. I checked around a few places and everyone (HKS, Fel-Pro and a couple other places) lists the same gasket for early and late D16A1 motors...HKS shows the same for both, plus the ZC.
Anyways...I just used the crank gear, guides and pulley from the newer block and stuck it in...runs nice. They run much smoother with all four rods in them. :)
I have no clue about the compression ratio, though. As someone posted here, the late pistons (supposedly the same as the ZC) have a much bigger dome...but they all (early and late D16A1) are supposed to have the same C/R (9.5:1). The early and late chambers look to be similar...how does that work? It doesn't ping on 87...LOL...so far... :?
It's not a race car (I have one of those <====see avatar), it's my daily driver, so I didn't get into cc'ing it or anything. Anyone have a clue what the C/R is or should be?
I just got done swapping an '88 D16A1 shortblock into my '87 CRX that has (had...blew a rod last week) an '87 -A1 motor in it. I couldn't find a decent early shortblock. I was sweating a little about whether it would work or not, because Honda lists different headgaskets for them. I checked around a few places and everyone (HKS, Fel-Pro and a couple other places) lists the same gasket for early and late D16A1 motors...HKS shows the same for both, plus the ZC.
Anyways...I just used the crank gear, guides and pulley from the newer block and stuck it in...runs nice. They run much smoother with all four rods in them. :)
I have no clue about the compression ratio, though. As someone posted here, the late pistons (supposedly the same as the ZC) have a much bigger dome...but they all (early and late D16A1) are supposed to have the same C/R (9.5:1). The early and late chambers look to be similar...how does that work? It doesn't ping on 87...LOL...so far... :?
It's not a race car (I have one of those <====see avatar), it's my daily driver, so I didn't get into cc'ing it or anything. Anyone have a clue what the C/R is or should be?