[1 fast z]

I know I know, we have been posting alot of pics of this head latley, but alot of people have been asking about progress, so here it goes:

[DatsunATX]

That rocks man keep up the great work.

Ben

[clint78z]

Not too sure the bolts are up for the job of keeping the head from warping when it heat cycles. Aluminum grows quite a bit when heated. Must aplaud on ambition to try new things, it may not work the first try but keep at it. My suggestion to keep the head together and make it fairly easy to put together. Is to make a cradle to support the head in. Slip each section into the heated cradle, and allow to cool creating an interferance fit, weld it in to prevent twisting forces. On the chamber side v groove the deck and weld between sections. The cradle should be made from same material as the head so it expands at the same rate.

Just an idea to a difficult problem !!

[Drax240z]

I think (and hope) those bolts are just for mock up and measurement purposes guys.

[Mack]

the heads will have dowel pins pressfit inbetween the halves (thirds?) that wil be drilled using a template that is made to keep the cam bores aligned. that will keep it from twisting. The head will be put on the block with more locating dowels than stock, Im thinking 4 to 6 total. The bolts are more to keep the head together while it is off the block. There will be a gasket made of expanded PTFE inbetween the halves. its temp range is -50 to +500. its only sealing water, and the radiator cap blows at 14psi anyway. Oil passages will be sealed with hollow dowels, seeing as how they see more PSI.

I think the combination of dowel pins, head bolts and little bolts will keep the head wherever it needs to be. Its not going anywhere once the head is clamped into place with 14 headbolts and 70 lbs/ft of torque.

McAdam

[turbobluestreak]

I'ld weld it like I'm doing. Two bolts arn't going to do anything for holding the head together. I'ld like to know what crank gear you have on that? I've tried boring out a stock KA24de gear and it broke at 300ft and the key (thats supposed to fail) was still holding up.




tbs

[4everDATSUN]

im goin to have to be negative and say there is no chance in hell thats goin to work. but youve done alot of nice work, and it LOOKS great. not sure about the bolts holding it together. you would def have to do some sort of welding so it doesnt leak, and so it will hold some sort of compression

[cygnusx1]

I bet it works but it probably won't have the longevity of a stock one piece head. Rather than the PTFE gaskets in between the sections, why not "o-ring" all the passageways with teflon or viton rings. Another critical area will be the head land between the pistons where the "splits" are. I would also "o-ring" the head gasket for good measure. I agree that the cam bushes should be OK as long as they are line-bored after the head and block are bolted and torqued together. Talk about thinking outside the box!! KUDOS~

[fl327]

Im not sure about the bolts myself, but I hope it works out, and also hope it makes production. Good luck.

[4everDATSUN]

well def the best of luck, you have def put alot of time into this. im not trying to shatter any dreams of the DOHC Z car. and i hope it works out, it would be a great achievment, and you would rake in alot of dough.

[cygnusx1]

Quote

.....and you would rake in alot of dough.

Time=Money, I doubt it would even be a break even.

[Nismo280zEd]

Wow.. that's awesome bro.

How much have you invested to get it this far? I would love to have a tiwn cam Z what are the 4 banger blocks off of?
-Ed

[stagefumer11]

ka24de