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Post by hydroli on Aug 17, 2008 21:16:46 GMT -5
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Post by zackbandyr12 on Aug 17, 2008 21:58:57 GMT -5
I'm glad u post this stuff.. Thanks
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Post by hydroli on Aug 18, 2008 20:06:24 GMT -5
You're very welcome.
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Post by sobeit on Aug 20, 2008 16:33:36 GMT -5
i am using my sunbird carrier, cam, rockers ect. the timing gear of a chevette will bolt to the cam but will be off centered. the belt slips on and will work w/ the tensioner. i am going to have my uncle machine the chevette cam gear where the chevette cam fits in to make it fit on the sunbird cam. the sunbird cam is slightly smaller and the pin is closer to the center. the chevette gear needs to go back a little bit in order for the belt to fit on right any ways.
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Post by zackbandyr12 on Aug 20, 2008 21:19:17 GMT -5
how much will it cost to make sunbird head fit on a vette??
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Post by sobeit on Aug 20, 2008 21:24:55 GMT -5
reman heads are about 90 rockers are about 30 if you dont get them, cam and cam carrier are unknown. i got a reman head w/ rockers new lifters (chevette ones are the same) cam, cam carrier, thermostat housing and water outlet for about $100 so i kinda lucked out. if my uncle works on the timing gear that will be free. you just need to decide what head gasket you are going to use, find a good intake and exhaust manifold. i am making my intake.
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Post by zackbandyr12 on Aug 21, 2008 23:12:57 GMT -5
What bout the oil holes/water jackets?? Have you got it figured out?? PM me
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Post by hydroli on Aug 23, 2008 9:23:29 GMT -5
I got the chevette head gasket. I found a few problematic areas where there's a need to add material. I'll gat back later on this point.
Another thing is that the way I install the head, I have to reverse the coolant flow pattern. It's due to the coolant outlet vs water pump configuration. With the exhaust ports facing me, the chevette engine has its water pump and water outlet at my right, while on the sunbird, they are on the left side. To understand what makes it a problem, the flow pattern must be understud. Having the head gasket in hand will help alot too.
The cold water comes from the water pump and enters in the water jacket (and marginally in the head by a tiny hole). It slightly warms up and starts to enter in the head through the small gasket holes, it continues to the back of the block and enter the big port of the head. The coolant then takes the big heat of the combustion chambers and goes out to be cooled down.
What appears after all this is that the water outlet has to be placed in front of the head, at which end the chevette head normally has the intake with the thermostat housing on it, and the flow pattern must pass through a coolant port at the back of the head to travel back to the front. The chevette has it, the sunbird doesn't. Cold water just can't enter the head at first while the last chamber gets all the heat...
So... The sunbird head will be modified with a coolant port at the back, a block off plate welded where the water outlet normally is and a water neck welded to the front of the head where the temp sensor used to be... temp sensor hole will be relocated on the water neck. The thermostat will be installed between two thermostat housings held together along the coolant hose.
More to come...
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Post by hydroli on Aug 23, 2008 9:28:21 GMT -5
Are you asking sobeit or me Zackbandyr12?
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Post by sobeit on Aug 23, 2008 10:44:51 GMT -5
but with the head w/ the water port in the front and temp sensor in the back i am fine?
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Post by hydroli on Aug 23, 2008 15:43:41 GMT -5
Water port refers to holes in the head. My configuration puts it in front and causes a problem. Your's is at the back and causes no problem. Just make sure that the gasket sits where it should and that there's no obstructed holes from the chevette gasket to the sunbird head. When installing the gasket, you should have the big hole at the back and the tiny one at the front.
Water outlet, thermostat housing, water neck, these terms refer to coolant exits from the head. Water ports refers to the holes in the head where coolant pass from block to head.
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Post by hydroli on Aug 24, 2008 14:14:21 GMT -5
Like I said previously, the coolant flow has to be redirected so that it comes from the back to the front. It will be achieved by the modifications shown below. I also mentioned that there are problematic areas that have to be corrected. They are identified with red marks. Here is where there will be a water passage machined to permit the reversed flow. Also shown in red is an area where the gasket won't seal. A picture of the area that has to be covered with a block off plate. Here's the front end of the head. A slight area to add material and pointed is the original temp sensor hole. This is where the new water outlet will be welded. That's it for now
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Post by hydroli on Aug 24, 2008 14:56:36 GMT -5
Concerning the oil feeding holes and cam lubrication... Feeding holes will be blocked off. On the block side as well as on the head side. I can't show the feeding hole on the deck surface but here is the hole that's to be cancelled on the head side. Like I wrote previously, I'll go with mechanical lifters, so no need for oil there, and external oiling circuit to lubricate the cam. The external oil feeding line will take its source where the oil pressure switch normally is... which will feel presure through a "Y" shape fitting. That's it again...
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Post by zackbandyr12 on Aug 24, 2008 19:52:35 GMT -5
Thanks
So hydroli, your gonna have a regular vette oilpump(in the oilpan) and a external?? I don't know what a oiling circuit is?
So your going to block off all the oiling feed holes to the head?? Right?? Just making sure I get it...
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Post by hydroli on Aug 24, 2008 20:59:38 GMT -5
Yes Zack, I'll use the chevette pump to feed the cam and maybe the turbo. You seems to be aware that I was looking for an external oil pump lately. I plan to upgrade the oiling circuit of the crank with this one. When I talk of the oiling circuit, it refers to any oiling "vein" that brings oil to the components.
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These: big head, stroker crank and turbo, are all big project and it costs alot more than I expected. Just for the head swap, it will costs around $750 total! For those who read this, I may be convinced that it it possible but don't blame me if it doesn't works for you. If it appears that I can't finish it for any reason, I will have to assume that I wasted money and precious time.
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