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EA71 Pistons

EA71 Piston Engine

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62 replies to this topic

#51 ivans imports

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Posted 21 August 2013 - 09:46 AM

could you take the tips off and make you own with some hi grade tubing



#52 NorthWet

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Posted 21 August 2013 - 03:11 PM

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.



#53 Twitch de la Brat

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Posted 22 August 2013 - 12:56 AM

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



#54 ivans imports

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Posted 22 August 2013 - 09:09 AM

drill the intake bolt holes biger theres some room there



#55 Twitch de la Brat

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Posted 22 August 2013 - 10:49 AM

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

#56 jono

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Posted 31 August 2013 - 04:56 PM

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



#57 Twitch de la Brat

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Posted 03 September 2013 - 12:02 AM

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.

#58 LeoneTurbo

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Posted 03 September 2013 - 12:27 PM

I just received the late 1986-1994 EA71 pistons, see pics.

 

IMG_2101.jpg

 

IMG_2102.jpg

 

IMG_2103.jpg

 

The design seems not much different than the early EA71 pistons.



#59 Mykeys Toy

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Posted 21 September 2013 - 01:44 PM

Fascinating topic..  Added to might try to pull this off someday list.



#60 ivans imports

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Posted 22 September 2013 - 11:10 AM

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.



#61 Uberoo

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Posted 23 September 2013 - 12:16 AM

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.



#62 Twitch de la Brat

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Posted 23 September 2013 - 10:57 PM

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



#63 Uberoo

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Posted 24 September 2013 - 08:16 PM

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.







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