DOHC head swap?
DIY King
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Okay... I've heard it a million times too, but why not? Doesn't the head house the camshafts as well? What's the specific reason? Anyone know, or are we all just repeating something said a long time ago?
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OK, here we go.
D16A1 - this is a DOHC 1.6L motor out of the 88-89? Integra.
D17A1 - this is the SOHC 1.6L motor out of the 01-02 Civic LX/DX
The cylinder bore is the same on the two eninges. The only reason the Civic has a 1.7L engine is because of the longer stroke which increased the displacemnt.
Both the engines have the same head type - A1, which suggests that the D16A1 DOHC head can be mounted on the D17 block.
D16A1 - this is a DOHC 1.6L motor out of the 88-89? Integra.
D17A1 - this is the SOHC 1.6L motor out of the 01-02 Civic LX/DX
The cylinder bore is the same on the two eninges. The only reason the Civic has a 1.7L engine is because of the longer stroke which increased the displacemnt.
Both the engines have the same head type - A1, which suggests that the D16A1 DOHC head can be mounted on the D17 block.
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Rep Power: 0 Oh, and also.....How can you say DOHC head on an SOHC engine. The block isn't DOHC or SOHC, the head is. Your putting a DOHC head on a block, not a SOHC block, just a regualr 'ole engine block that doesn't have a cam designation because the block doesnt house the cams.
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Rep Power: 0 ehhh....you have a point there. BUT....isn't if possible to use the same igniton coils on the DOHC head? As long as the plugs are in the same depth, I don't see why not?
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Rep Power: 419 AFlyer: In a DOHC you allow the engine to take in more air and to burn the fuel more completely for a bigger push. Basically you can open the intake valves early and close the exhaust valves late. In a SOHC, all you can do is shift the power curve because all you can do is open the intake and exhaust valves early and close them early, or open the intake and exhaust valves late and close them late. The DOHC just gives you one more variable that you can control for optimum performance of the engine.
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From: Reading, Pennsylvania, US
Rep Power: 0 This has been covered before, you can only swap parts between certain blocks, B-B, D-D, H-H and so on, you can't mix and match otherwise. Coolant passages are off, head bolts, and pretty much everything.
Chris
Chris
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Rep Power: 0 Slammed2k1 is right, unless by some miracle honda lined everything up hoping its buyers would do an head swap, and I highly doubt they did this, it won't work. If you want DOHC get a new block and then stick your head on it.
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Rep Power: 0 OK, so your telling me we can only swap with the head off another D block?? Did you read my earlier post about the D16A1 being a DOHC head (late 80s integra). This engine also goes by the code ZC (that's the JDM code for it.)
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Rep Power: 0 What do you guys think?
Cylinder Heads
Cylinder Heads
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Rep Power: 0 << dohc and sohc engines are 2 completly DIFFERENT ENGINES ALL TOGETHER! >>
I'm sorry to be the one to inform you, but your wrong. The difference in an SOHC and DOHC engine is all in the head. The head houses the cam or cams. The bottom half of the engine has nothing to do with whether an engine is DOHC or SOHC.
Some info here on camshafts and stuff. Click Here
It clearly says that the cams are housed in the head. HAPPY?????
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d's and b's have the same block and pistons, but could you honestly imagine swapping a head with all the work of connecting rods and internal parts, just swap in a new engine!
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Rep Power: 0 << OK, so your telling me we can only swap with the head off another D block?? Did you read my earlier post about the D16A1 being a DOHC head (late 80s integra). This engine also goes by the code ZC (that's the JDM code for it.) >>
That engine at least the D16a1 is 118hp, the D16a8 and 9(which are JDM, the a1 isn't,) that runs about the same compression as "ours" makes about 10hp more, why would you want to do all that work for basically nothing? You would have to change your ecu, and convert to OBDI which would be illegal also, any car made after 96 has to have OBD II, that head is also Non-Vtec, therefore not even worth mentioning.
Chris
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Rep Power: 0 Your forgetting the whole point. The only reason I am wanting to do a head swap is so that I can get more gains out of the engine after the turbo and ECU upgrade.
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Rep Power: 0 << d's and b's have the same block and pistons, but could you honestly imagine swapping a head with all the work of connecting rods and internal parts, just swap in a new engine! >>
Excuse me if I'm wrong, but I thought you swapping the head meant swapping the head, not the pistons, rods, etc..
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Rep Power: 0 Yes, I follow that, but my point in listing what I did is that the D-series head even though it is DOHC it is restricted, just because it has two cams doesn't mean anything. The best option for a head swap is probably a SOHC D16 head from last years civics, then you can run a distributor, and the older style fuel management and add a turbo cheaply and without a problem. I am still doing a little research but I think the D-17 and D-16 heads might actually be basically the same, if not exactly the same. I was out looking at my car the other day and noticed that there is a spot for a distributor it is just plugged, which lead me to believe that it might be the same head, I am going to check out the casting numbers and find out. If it is that would be pretty sweet.
Chris
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Rep Power: 0 I WILL, get the head of my EX as powerfull or more as them twin cam, AND as soon as I take my car to the dyno I'll post the hp's.
Just have to work it, and forget about the headaches!
Just have to work it, and forget about the headaches!
