briankk Posted February 24, 2015 Share Posted February 24, 2015 I know that there were three seperate generations of "regular" EA82 heads. The turbo head is another thing altogather, were there seperate generations of turbo heads? If so, how do you tell them apart? Can cracked turbo heads be repaired, or must they be replaced? Quote Link to comment Share on other sites More sharing options...
john in KY Posted February 24, 2015 Share Posted February 24, 2015 Just EA82 casted in the head is one generation, EA82 with a line underneath it is another, and EA82 inside a box is another. Can't recall which mark is for which generation. Can be welded but if the crack is just between 2 valves, very common and not a concern. If the crack goes into the exhaust port, major problem and scrap the head. Quote Link to comment Share on other sites More sharing options...
briankk Posted February 25, 2015 Author Share Posted February 25, 2015 Just EA82 casted in the head is one generation, EA82 with a line underneath it is another, and EA82 inside a box is another. Can't recall which mark is for which generation. As I understand it, that is true of the plain, non-turbo heads, I'm asking if there is a simiar situation with the turbo heads, and if so, how are they marked? Also, can the turbo heads and kit be bolted up to a non-turbo block? Does the turbo engine come with forged pistons from the factory? Pretty much how much interchange is their between the turbo and non-turbo engines? Quote Link to comment Share on other sites More sharing options...
john in KY Posted February 25, 2015 Share Posted February 25, 2015 I have in the past owned an 85 turbo XT and a 90 turbo wagon and those cylinder heads had those markings. Don't believe the turbo pistons are forged . Making a NA block a turbo, let's see, heads, intake, distributor, knock sensor, exhaust manifold. AFM, and who knows what else. Thinking the 3rd generation turbo heads had the EA82 inclosed in a box, but it has been a long time. My 90 turbo wagon had the 3rd gen heads, ran 12 pounds of boost from 150k miles to 250k when I sold it. New owner ended up ripping the front differential out and scrapping it. I would have bought the car back if I had known he was going to scrap it. Sure did enjoy that car. Quote Link to comment Share on other sites More sharing options...
ccrinc Posted February 25, 2015 Share Posted February 25, 2015 (edited) As I understand it, that is true of the plain, non-turbo heads, I'm asking if there is a simiar situation with the turbo heads, and if so, how are they marked? Also, can the turbo heads and kit be bolted up to a non-turbo block? Does the turbo engine come with forged pistons from the factory? Pretty much how much interchange is their between the turbo and non-turbo engines? First, only the turbo heads had the 3 "generations": the other styles didn't change at all. So, #1 is plain casting, #2 has the line below it and #3 has the box around the EA82. The major change on these was to beef up the metal in the exhaust ports so that they did not have leaks from the coolant passages as easily. "MINOR" cracks between the valves can be peened closed and smoothed over. However, if they go into the coolant jackets, they're scrap. You could "bolt up" heads to a turbo block, but it would be worthless. There are many internal and external differences. If you want a turbo engine, you have to start with a turbo engine. (The MPFI block and the turbo block are identical. The SPFI block and the carb blocks are identical. Between those, you can interchange. Between SPFI and turbo? No.) Edited February 25, 2015 by ccrinc 1 Quote Link to comment Share on other sites More sharing options...
Subruise Posted February 26, 2015 Share Posted February 26, 2015 as a matter of fact. you can use a carbed block w turbo gear and be ok. an spfi block will have a higher compression number due to piston height. many people have pulled this off. ask MilesFox. its possible with basic machining intelligence. all the bosses are there for you to drill, tap, and convert. furthermore, i have NA ea82 heads w different markings......... Quote Link to comment Share on other sites More sharing options...
ccrinc Posted February 26, 2015 Share Posted February 26, 2015 I'm not saying it can't be done, I'm just saying it won't be worth much. If you want it to not explode, it should have turbo pistons, not SPFI pistons or carb pistons. Drilling, tapping and converting is not the same as "bolting them on". Miles can be ingenious as hell, but I also remember when he drove to WA State with several (IIRC) milk jugs strung together in his trunk in place of a gas tank! True story!! Quote Link to comment Share on other sites More sharing options...
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