August 21, 201312 yr Ummm... isn't the adjuster screw on the pushrod end of the rocker? If so, as long as there is enough adjustment in the screw to compensate for the removed material, the rocker geometry should stay exactly the same.
August 22, 201312 yr Author I have already accounted for this in a conversation with Delta. I had a torque grind applied to my cam, which takes approx .030" off the cam lobe. In my removing .030" off my head/block surface, I have minimal adjustments to be made to my valvetrain My biggest monster is going to be the intake. Which may be getting cut down to fit with some custom piping, or I may just make a custom manifold. But thank you for the reminder Also, on break in, I already have break in oil in mind. I'll be switching to Schaffer's once Its all broken in and happy. Twitch
August 22, 201312 yr Author I'm worried about airflow. I may end up filing off the edges of the intake when I bolt it up so it flows better, if I have to oval the holes. Twitch
August 31, 201312 yr no ned to oval the inlet to head holes, unless you have an oval hole drill - just a larger diameter round drill bit in each hole both ends, makes a big difference
September 3, 201312 yr Author no ned to oval the inlet to head holes, unless you have an oval hole drill - just a larger diameter round drill bit in each hole both ends, makes a big difference I'm going to oval them with a same sized drill bit as the hole, just grinding out the side that needs more space. That way I only have one plane to worry about when remounting rather than multiple. Twitch PS: Or I may just build a custom intake using my old manifold.
September 3, 201312 yr I just received the late 1986-1994 EA71 pistons, see pics. The design seems not much different than the early EA71 pistons.
September 22, 201312 yr The dealer said is same piston for ea71 and ea81 all ea71 all ea81s ex turbo cars a'm rebiulding a ea 81 for airplane and when resarching pistons this is what we were told by dealer. I oppted for the 94 ea82 pistons as they have the strongest ring lands. And reliability is key.
September 23, 201312 yr hey twitch I have an EA71 engine I am trying to get rid of.If you still need pistions I could pull it apart and pull the pistons+rings for $50 for all four pistons.
September 24, 201312 yr Author hey twitch I have an EA71 engine I am trying to get rid of.If you still need pistions I could pull it apart and pull the pistons+rings for $50 for all four pistons. MIles? Condition? Known problems with the engine (eg: overheating, burning oil, etc)? Twitch
September 25, 201312 yr Unfortunately I don't know anything about them.The engine was in the back of a vehicle I bought.I had the heads off because I was going to change the headgaskets and run it but while it was apart I managed to loose about 1/2 the bolts/nuts/and pushrods,I suppose that is what I get for building an engine in my driveway.So I decided just to get an EJ22 and not even worry about the EA71. The bores looked very good when I had the heads.I tilted the engine up on the side and poured a bit of oil into the bores and it seemed to stay on top of the pistons so it shouldn't leak much.
February 7, 20251 yr There is NO difference between ea71 and ea81 pistons I have pulled down both motors the Pistons are the EXACTLY same dimensions, gudgeon pin dimensions etc are the same. Both pistons are 92mm. EA71 has a 60mm stroke and a 111mm Conrod centre to centre , and the ea81 a 67mm stroke and a 117mm conrod c-c. The engine block of the ea71 is 345mm and the ea81 370mm. EA82 pistons are 92mm and compatible with both ea71 and ea81 motors. EA82 Turbo pistons are 92mm and they are recessed on the top and are a non event in a non turbo motor. To get the extra performance from Turbo ea82 pistons the engine has to be fitted with a turbo. Edited February 8, 20251 yr by gazza01 More information
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