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Old 07-14-2012, 07:28 PM   #1
mechrider89
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@ Canadianbak'insupra- I'm sure its fine bak'in, I'll get this sorted out soon as I'm done renovating the rents house for them.

After this next payday I should have more then enough to get my cylinder head all redone. Went and got a rough quote on what it might cost, $712 for hot tanking, valve guides, full valve job, decking, and pressure testing for cracks.
The WCU made a buzzing sound, but it stopped after I installed the new wiper motor. So that's where I'm going to go next I think, I know I can get one of those from the only scrapper that has a supra in stock.
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Old 07-14-2012, 08:03 PM   #2
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I would get the wiper switch too.

You must have a lot of miles on your car. My head only needed $348.00 in machine work. After all, you can get a reman for $500.00.
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Old 07-14-2012, 08:23 PM   #3
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Ok, once the head is clean you can search for cracks, they usually show right up. They can magnafux them to look for cracks, but not on aluminum. Your head is Aluminum so it cant be hot tanked, but they can put it in their parts cleaner.

The main thing you need is, the head cleaned($35), shaved($65), reground($200) with new valve seals in it.

You can put over sized valves in it, that is where heads can get expensive, then polishing the compustion champers (Better head distribution in the cylinder) Smooth out the exhaust ports (very important) then port match the intake by using the intake gaskets that are going on the car. (don't go beyond 90grit when porting the intake) you want the turbulent air for better fuel mixture. the exhaust should be a smooth as possible for quick evacuation.

Are you building this head so you can add a turbo later? Then you really want the chamber to be polished. (don't run more than 8.5 to 1 compression though, or else it will ping and predetonate.
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Old 07-15-2012, 09:48 PM   #4
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does a re manufactured head come with all new components? as it sits right now I may end up just buying a valve spring compressor and pulling the valves myself. Then going to polish the valves and domes, port the intake and exhaust runners, so hopefully when I get the pacesetter header it'll be about the same diameter so I get a good flow.

As for miles well my supra has 263k kilometers which is like 165k miles, I've heard of these 5m's getting well into the 300k miles with proper maintenance before calling it quits.
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Old 07-16-2012, 05:04 AM   #5
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Quote:
Originally Posted by mechrider89 View Post
does a re manufactured head come with all new components? as it sits right now I may end up just buying a valve spring compressor and pulling the valves myself. Then going to polish the valves and domes, port the intake and exhaust runners, so hopefully when I get the pacesetter header it'll be about the same diameter so I get a good flow.

As for miles well my supra has 263k kilometers which is like 165k miles, I've heard of these 5m's getting well into the 300k miles with proper maintenance before calling it quits.
Yes, that is exactly right. If you end up pulling the valves out yourself make sure you know where each valve goes. As they are worn to fit in each hole that they are in. Same with the lifters and rocker arms.

Sometimes when you rebuild a head the engine may smoke because the extra pressure on the rings, but I doubt this will happen, as long as you have changed your oil semi-often (every 7,000 miles or so)

What you have planned may only get small horse power increases. You should look for a junk head and practice polishing. Get the car running for the least amount possible for now and plan for a rebuild in in 65,000 miles. You can get the necessary machine work for the $348 or so I said earlier.

It's acturally really hard to properly port and polish a head. You need a flow bench. Your best bet is to plan a 1jz transplant if you want more power. I am going to throw some money away when I do my 5mge overbore. I will have the heads professionally done ($2000 by a racing outfit) and then bore and hone for the over size. The cost is about as much as to do the transplant, but I will only get 240hp (about the same as a Ferrari 308 of the same period.) The Jz1 will get much more. (not sure on specifics, but it's hundreds more)

You should really keep your car stock and running. Buying new shocks and struts is the best investment on my car. As the 85 supra is an awesome drift car. (I was impressed with my car after the new shocks and struts.) Your car is a fun car just driving it. Take care of it and keep the interior and exterior in the best shape possible to keep it's value. Value is the most important thing with this vintage.
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Old 07-16-2012, 05:28 AM   #6
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I seriously doubt you need springs and guides. (make sure you replace the timing belt and tensioner pulley though)
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Old 07-16-2012, 05:35 AM   #7
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http://rabidchimp.com/oversized-stai...ves-5m-6m.html

Rapid chimp has some oversized valves, but they are $432.00 for 12, that is $36 a piece.
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