dohc head on sohc ka

Post by **smug510** » Sat Aug 23, 2003 11:46 pm

ok ive looked around and i cant find a reason why the dohc head wont fit on a sohc , will someone please tell me why , i mean real facts not just " wont work " thx

Post by **U12 2NR** » Sat Aug 23, 2003 11:46 pm

It doesn't take a genius to figure out that you take a look at both head gaskets and see that the bolt pattern and water channels are different.

Post by **96_S14_SE** » Sat Aug 23, 2003 11:46 pm

Yeah as u12 said it just doesnt fit

Post by **smug510** » Sat Aug 23, 2003 11:46 pm

thats funny because ive done just that , i have a head gasket off of a 89 sohc and a gasket off of an 95 dohc and there the same , the only thing different is on the sohc the gasket seals part of the timing chain cover . so i dont know what gaskets you guys are looking at but ive seen it for myself, and i think it would work

Post by **trpower7** » Sat Aug 23, 2003 11:46 pm

It won't. I have a DOHC head and an SOHC block, it's not even close.

Post by **deviousKA** » Sat Aug 23, 2003 11:46 pm

i have "heard" that the dohc ka that comes in the trucks/frontiers/pathfinders actually uses a sohc type block. maybe that is why someone found that the headgaskets were similar. does anyone know the exact differences in the truck vs. 240sx dohc ka24?

Post by **smug510** » Sat Aug 23, 2003 11:46 pm

U12 2NR wrote:It doesn't take a genius to figure out that you take a look at both head gaskets and see that the bolt pattern and water channels are different.

here is both gaskets sohc and dohc here is the dohc gasket on the dohc head here is the sohc gasket on the dohc head here is the dohc gasket on the sohc gasket here is the sohc gasket on the dohc gasket

you can see why i think this would work they line up fine

Post by **deviousKA** » Sat Aug 23, 2003 11:46 pm

are you sure that is the 240sx ka24de head? does seem to line up. this makes me think im correct about the dohc truck engine

Post by **SingleCamSam** » Sat Aug 23, 2003 11:46 pm

Now there's something to think about. Have you test fit the DOHC head?

Post by **smug510** » Sat Aug 23, 2003 11:46 pm

no, the only sohc block i have anymore is the one in my car, i had a sohc motor with blown head gasket [in the pics ] but i read on here that dohc head was impossible so i took it to the junkyard , so than my dohc blew the head gasket on nos [ fuel line broke in the middle of 3rd gear on the button ] so i threw in a sohc out of a friends 240 , and took the dohc apart and looked at the head gaskets and realized they were very alike . so im going to try to get another friends sohc , and try it .

its a good thing all of my friends are going sr20 and they are just giving me there motors. thats the way ive got all of my motors , i got my dohc by helping my friend put a rb26dett in his 95 240 , here are some pics

and here are some pics of my car

Post by **D-UNIT** » Sat Aug 23, 2003 11:46 pm

Get some Toyota silicone sealant for that front cover. I did a timing chain change on my kade and murdered that part of the Head gasket. Ended up just ripping that part off. My best friend told me about that toyota stuff (works there). Not one milliounce of oil to be seen. btw that would probably be a good turbo motor with the kae's c.r. and all. But I don't know If the de's head changes the c.r. of the e's block. hhummm...

Post by **D-UNIT** » Sat Aug 23, 2003 11:46 pm

Also, how do you plan to run the cams !?!

Post by **smug510** » Sat Aug 23, 2003 11:46 pm

i was thinking the sohc pistons raise the cr in the dohc right? so the dohc on the sohc block should do the same , as for the cams, the deck hieght should be the same as the dohc so the timing chain should work,

Post by **deviousKA** » Sat Aug 23, 2003 11:46 pm

there is no point in doing this. yes a dohc ka non-240sx head may bolt up to the sohc with some work. but whats the point? might as well just get the entire engine from a 91+ 240sx and put sohc pistons in if you want high compression. Another thing, if this head can bolt to kaE, z and l series blocks are another possibility, can we say 10,000rpm

Post by **McAdam** » Sat Aug 23, 2003 11:46 pm

yes, can you say home-made FJ20ET? If the DOHC head will go on the SOHC block, THEN we can put a DOHC head on a Z24 truck block and stuff a L20B fully counterweighted crankshaft in it, with 172mm and 240sx 90mm forged pistons with 1.5mm milled off the top for clearance, you've got a 2.2L motor , 2:1 rod/stroke ratio, fully counterweighted short(er) stroke crank, and a 4 valve/cylinder head. Hrmmmm, I'd like a side of rev's with my torque please!

McAdam

Post by **smug510** » Sat Aug 23, 2003 11:46 pm

the point is, a head gasket and front seal, intake and exaust gaskets are a whole lot cheeper than, head gasket , rod bearings, rings,intake and exaust gaskets, block honed, breaking in the rings and bearings , just more cost effective , and the head i have is out of a 95 240 , took it out myself.

Post by **deviousKA** » Sat Aug 23, 2003 11:46 pm

McAdam wrote:yes, can you say home-made FJ20ET? If the DOHC head will go on the SOHC block, THEN we can put a DOHC head on a Z24 truck block and stuff a L20B fully counterweighted crankshaft in it, with 172mm and 240sx 90mm forged pistons with 1.5mm milled off the top for clearance, you've got a 2.2L motor , 2:1 rod/stroke ratio, fully counterweighted short(er) stroke crank, and a 4 valve/cylinder head. Hrmmmm, I'd like a side of rev's with my torque please!

McAdam

i like the way you think McAdam. How would this be an FJ20? im not familiar with this engine. im doing the same thing im just using a kaE head so no need for wiring hassles in my current car. if i had a dohc 240, i would find the truck head and go to town. still none of this about the dohc on sohc has been confirmed

Post by **smug510** » Sat Aug 23, 2003 11:46 pm

soon , im going thursday to yank the sohc out of a friends car , so friday i will confirm it. and then the s#@t will hit the fan , i dont know about you guys but 12:1 compression ratio in a 2.4l with a 100 shot of nos sounds pretty good to me , all while saving for pistons for the dohc block, and then turbo dohc.

by the way if anyone is interested in turbo manifolds, i can make them, ive only made them for hondas but im making on for my dohc but anyway heres some picshttp://www.we-todd-did-racing.com/wetoddimage. ... MXk1NDE%3D[/img]http://www.we-todd-did-racing.com/wetod ... MXk1NDE%3D[/img]http://www.we-todd-did-racing.com/wetod ... MXk1NDE%3D[/img]

Post by **smug510** » Sat Aug 23, 2003 11:46 pm

sh@t i messed that one up sorry

Post by **McAdam** » Sat Aug 23, 2003 11:46 pm

DeviousKA, here ya go http://www.fj20.com/ its only one of the most bad-*** four cylinders ever made. check it out.

smug510>> you make turbo manifolds, eh? those look very nice! how much for one? I have a CA18DET project in need of a manifold. also, let me know what you find when you get this DOHC SOHC thingy squared away. I am VERY interested. check out my website and look at what my next plans are and you'll see why. the headgasket match up does indeed look very promising!

McAdam

Post by **deviousKA** » Sat Aug 23, 2003 11:46 pm

very nice site. i need to source myself a few crankshafts. no one believes me about z22 fully counterweighted crank, i will find one and laugh at all.

Post by **McAdam** » Sat Aug 23, 2003 11:46 pm

if they are, even better! Z22 is 92mm stroke, correct? more displacement! MORE MORE! lol. If this DE head on a E block thing works out, I'll scrap the SOHC L6 head idea and go DOHC all the way! hrmm, I am thinking I could pull skyline-esque HP numbers with a DOHC head on a L28ET block and a turbo of 2. I've got too much time on my hands!

McAdam

dohc head on sohc ka

dohc head on sohc ka

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