HybridZ: DOHC Progress pics AGAIN - HybridZ

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DOHC Progress pics AGAIN Rate Topic: -----

#1 User is offline   1 fast z 

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Posted 26 March 2005 - 07:17 PM

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:






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#2 User is offline   DatsunATX 

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Posted 26 March 2005 - 07:32 PM

That rocks man keep up the great work.

Ben
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#3 Guest_2slo4u_*

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Posted 26 March 2005 - 08:15 PM

Looks cool, but I'm not so sure that connecting the seperate heads using sealants and bolting them with two bolts will keep the camshaft parallel enough to prevent bearing damage or binding, especially with expansion and contraction of the seperate heads, even when bolted to the block. Hopefully you find a way to cast the entire head as one, that would be great and you would surely have many happy customers.
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#4 Guest_nolafool_*

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Posted 28 March 2005 - 06:10 PM

very nice .. i'm kinda with 2slo but great work thus far
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#5 User is offline   clint78z 

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Posted 29 March 2005 - 09:26 AM

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 !!
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#6 User is offline   Drax240z 

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Posted 29 March 2005 - 12:05 PM

I think (and hope) those bolts are just for mock up and measurement purposes guys.
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#7 Guest_eric-z_*

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Posted 29 March 2005 - 06:44 PM

Drax240z said:

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


yeah I couldn't tell if those guys were being sarcastic or not... but that is my prediction as well

eric
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#8 User is offline   Mack 

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Posted 29 March 2005 - 11:11 PM

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
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#9 User is offline   turbobluestreak 

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Posted 30 March 2005 - 09:31 AM

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
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#10 User is offline   4everDATSUN 

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Posted 30 March 2005 - 12:44 PM

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
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#11 User is offline   cygnusx1 

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Posted 30 March 2005 - 01:47 PM

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~
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#12 User is offline   fl327 

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Posted 30 March 2005 - 06:16 PM

Im not sure about the bolts myself, but I hope it works out, and also hope it makes production. Good luck.
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#13 User is offline   4everDATSUN 

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Posted 31 March 2005 - 10:40 PM

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.
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#14 User is offline   cygnusx1 

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Posted 05 April 2005 - 08:36 AM

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


Time=Money, I doubt it would even be a break even.
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#15 User is offline   Nismo280zEd 

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Posted 05 April 2005 - 07:38 PM

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
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#16 Guest_DoTheDrew888_*

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Posted 06 April 2005 - 05:26 AM

240SX I believe.
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#17 User is offline   stagefumer11 

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Posted 06 April 2005 - 11:26 AM

ka24de
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