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Guest Message by DevFuse
 

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More Newbie Qs: ea-81 intake manifold/K&N Filter Size


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7 replies to this topic

#1 Dante

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Posted 21 October 2003 - 06:13 PM

Intake manifold questions:

Is the ea81 manifold heated for emissions reasons? I saw a heated exhaust manifold for an MG and the copy said it was heated for emissions reasons. here's some more info on heated intake manifolds

If so, can you just plug the coolant passage? Or is it actually important for cooling the block? Would plugging them improve performance?

Can you get the Asian dual-carb manifolds in the US? I saw a couple posts about getting them off engines from Japan.

If so, what are the benefits? Somebody mentioned something about spinning the tires in 3rd and 4th in another thread--sounds good to me :D

K&N questions

What is the biggest K&N filter that will actually benefit an ea81? The filters that come with the weber conversions look pretty small. Someone chose to run a K&N about the same size as stock, and with a drop base plate, you could run one of the big round ones if doing so would actually improve performance.

Thanks :-)LINK

#2 JonOfScio

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Posted 22 October 2003 - 09:50 AM

the manifold isn't heated, it's cooled.

IF the manifold didn't have water running through it, it would heat up REALLY hot. Whereas, water passing through it helps to cool it. This is also why there is a black spacer between the manifold and the carb, you WANT the least amount of heat around the carburetor as possible.

And you couldn't plug it up, because the water passage goes from one head, through the manfiold, to the heater core, back through the engine. You'd need to direct the water to the heater core, FROM the passenger head, and then of course find some way to keep the manifold cool by other means... (a seperate cooling system?)

Before swapping to a weber, with the stock hitachi and all the vacuum lines and stuff, I could bark it into fifth gear. So I'm eager to see what a weber will do on my car. Designed my own vacuum system too. No vacuum lines = one pretty cleaned up block.

Eager to get it up and running.

Oh, and yeah, a dual carb jap manifold is pretty rare. Imagine TWO hitachis, or hell, TWO webers. nice.

#3 Dante

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Posted 22 October 2003 - 11:27 AM

Thanks for the info, JonOfScio.

Originally posted by JonOfScio
No vacuum lines = one pretty cleaned up block.



That's one of the reasons I'm shopping for an ea81--simplicity.

#4 JonOfScio

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Posted 22 October 2003 - 11:31 AM

well, an EA82 you can do the same things... weber swap and remove vacuum lines and stuff.

EDIT: where do you live in the NW? There's lots of board members around.

#5 trooperjeep

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Posted 22 October 2003 - 11:36 AM

I did the direct replacement K&N air filter trick on my TBI 92 Loyale, then perforated the botom of the breather box to let in more air.

It has a lot quicker throttle response now and seems to run better.

Not too bad for a 90 HP engine.

:D

T.J.

#6 Dante

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Posted 22 October 2003 - 12:34 PM

Originally posted by JonOfScio
well, an EA82 you can do the same things... weber swap and remove vacuum lines and stuff.

EDIT: where do you live in the NW? There's lots of board members around.



I'm in Seattle. I like the ea81 better because of the lack of an OHC--it's simpler and lighter, that's why the aviation guys like them. I also like the ea81 4WD wagons better because they have more ground clearance without lifting them or cutting the wheel wells. I kind of like the funky old-school styling, too.

#7 JonOfScio

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Posted 22 October 2003 - 01:30 PM

Same reasons why I like EA81s, and the style. Old school all the way.

#8 Wasteland

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Posted 22 October 2003 - 02:37 PM

I've got a dual carb I found in a junk yard about a year ago. I'm not sure how long it sat in the yard, but I bolted it onto my '84 hatch and it fired right up! the thing screams! I took it off to rebuilt it, but man was it wild!




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