EA dual port heads

velocityboy · Post by **velocityboy** » Wed Feb 27, 2013 5:15 pm

Thanks again guys. I will still keep an eye out but it looks like I'll have to go for plan "B"

velocityboy · Post by **velocityboy** » Fri Mar 01, 2013 7:31 am

I have an EA71 and EA81 so I have both options, either get the dual port (2 exhaust ports) heads for the ea71 or just modify the ea81 heads and use that motor. Like everyone else I'm trying to get most power for the least effort and without chopping up my 1st gen Brumby to put in a ej motor. What do you guys think would make the most power out of the 71 and 81 options?

YouTube · Post by **El_Freddo** » Sat Mar 02, 2013 10:02 pm

EA81 *I believe* will make more power straight up compared to the EA71. I'm sure the likes of Paul or Jonno will elaborate though!

Cheers

Bennie

sublime · Post by **sublime** » Sat Mar 02, 2013 10:32 pm

The EA81 was more about torque than power. Heck the 'dirty' EA63S made more power than the EA81... But less torque.

When new the EA71 made around 50kW compared to the 54kW of the EA81 (4wd versions - 2wd had a little more)... Not really a lot in it!

Post by **TOONGA** » Sun Mar 03, 2013 1:45 am

heres some heads for an EA81 that might interest you

http://www.flygas.info/en/subaru-ea81-cylinder-head.htm

would not be cheap though

TOONGA

velocityboy · Post by **velocityboy** » Sun Mar 03, 2013 4:32 pm

Those flygas and SUB4' heads are nice, but so is a F430 Ferrari;) The difference between 50 and 54KW's is scary, I think the starter motor on my last engine build made more power than that. I am just going to do some mild tweeking on the EA81 and see where it ends up, I'm determend not to get carried away on this one,,,,I think.

RSR 555 · Post by **RSR 555** » Sun Mar 03, 2013 10:34 pm

The EA71 works very well in the Ugly model but the extra weight of the MY model, slows it down too much. I have had both the EA71 (in the 1980 MY wagon) and the EA81 (in the 1982 MY wagon) along with many Brumby's over the years.

I would go the EA81 with twin carb (or weber) and port the inlet and manifold and also port and polish the exhaust side. Use a set of custom headers and a 2" system.

nncoolg · Post by **nncoolg** » Mon Mar 04, 2013 6:09 pm

Oooh...

me likey!

I would like to see some photos of the SUB4 heads, are they siamesed exhaust?

YouTube · Post by **El_Freddo** » Mon Mar 04, 2013 6:32 pm

nncoolg wrote:I would like to see some photos of the SUB4 heads, are they siamesed exhaust?

You can find them in the link above (somewhere above!) They're all there. 4 spark plugs per head - looks all good until you get to the exhaust - and find that they've kept the siamese exhaust

I thought if you were going to all this effort you'd also do the exhaust ports as individual ports for best performance possibilities...

Cheers

Bennie

nncoolg · Post by **nncoolg** » Wed Mar 06, 2013 8:27 pm

Im not seeing that link hey, do you know where the photos are?

YouTube · Post by **El_Freddo** » Wed Mar 06, 2013 8:39 pm

TOONGA wrote:heres some heads for an EA81 that might interest you

http://www.flygas.info/en/subaru-ea81-cylinder-head.htm

^ In this link hit the "photos" tab below their spiel on these heads. You'll get about 12 or so other pics to check out like these two:

Cheers

Bennie

nncoolg · Post by **nncoolg** » Wed Mar 06, 2013 8:48 pm

Yeah, thats the Flygas heads...You said there were some pics of the Sub4 heads?

YouTube · Post by **El_Freddo** » Wed Mar 06, 2013 8:55 pm

nncoolg wrote:Yeah, thats the Flygas heads...You said there were some pics of the Sub4 heads?

Sorry I got my wires crossed

I've only seen the pics from above and don't know if the SUB4 exhaust is siamese or not.

Apologies

Bennie

Gannon · Post by **Gannon** » Wed Mar 06, 2013 9:00 pm

With the exhaust divider coming all the way to the surface like that, if you were keen, you could shape 2 x D shaped pieces of exhaust pipe and place them back to back, and then angle them apart so it gives you 4 true exhaust ports

velocityboy · Post by **velocityboy** » Wed Mar 06, 2013 9:31 pm

I don't think it is that the ports are siamesed so much as they are restricted in the stock heads. The total size of the port at point the 2 runners join is more than adequate but in between the ports is a water jacket that goes around a head stud hole and this makes a massive restricion, especially on one port. At one point this port has to take a left then a right turn and at that point the port is as small as 12mm x 36mm. I have worked out a way to remedy this, I will post some pics when it's done.

nncoolg · Post by **nncoolg** » Thu Mar 07, 2013 8:56 pm

So yeah... I finally found some photos and the sub4 heads are 4 port heads, you can see the additional exhaust port at the side of the head, on the angled part(the front on RH side, the back on LH side) thats how they dodge around the pushrod 'galleries':

It'd be nice to see some photos of the exhaust side, but I guess this will do for now

Matt · Post by **Matt** » Thu Mar 07, 2013 9:10 pm

Is that in a car in Australia or the states?

nncoolg · Post by **nncoolg** » Thu Mar 07, 2013 9:12 pm

UK I think and judging by the brake master cyl. / booster and steering shaft its not the US

steptoe · Post by **steptoe** » Fri Mar 08, 2013 12:06 am

Could be NZ.Is the battery Halford Advance ?

Rodeo4jake · Post by **Rodeo4jake** » Fri Mar 08, 2013 6:46 am

I only have one thing to say about those pics: I want one.
But unfortunately, even I have to admit I would just go EJ cos it's just too easy & cost effective.

Cheers Jake