http://www.ultimatesubaru.org/photos/showphoto.php?photo=12832&cat=500&ppuser=17621

 

 

I have been thinking about this for a few days now and wanted to get some feed back.

The reason I think this would be a good Idea is

1. the dual carb intake is larger and has better flow

2. you dont have to mess with the dual carb linkage

3. if I go with a q-jet carb I can tune it and actualy find parts for the carb.

 

No one seems to have a good pick of the dual carb intake on a usdm ea81 motor but on the other hand I know there are alot of guys on the board that has this intake.

 

So what do you think?

here is a real real rough side view of the intake.

 

 

http://www.ultimatesubaru.org/photos/showphoto.php?photo=12833&cat=500

 

I know this intake will not clear the hood but we all need a reason the build a hood scoop.

My biggest concern is making the linkage work and the impact of the carb being so high off the motor.

 

maybe Scott (sjr) coold make one.

I know I could probbaly make a prototype.

I think the EA82 manifold would flow even more than the dual EA81. Is the proof that the dual EA81 flows more than the stock EA81?

 

-Brian

Well I dont have a ea82 to look at but by design I would think it is bigger due to the dual carbs over the one carb application on the ea82.

OH one more thing I have know way of know what this carb came off of a ea82 or ea81 but I do know it will fit on my 81

looks larger to me.. but I could be wrong.

 

http://www.ultimatesubaru.org/photos/showphoto.php?photo=12835&cat=500&ppuser=17621

 

 

http://www.ultimatesubaru.org/photos/showphoto.php?photo=12834&cat=500&ppuser=17621

maybe Scott (sjr) coold make one.

 

.

 

 

we could take a stock subbie intake , cut the top middle out and weld on a new top that was cast up using the Q-jet base pattern

it may give better flow characteristics going in to the dual carb manifold like that .but,you also have to consider that two webers would provide more fuel than one q-jet.and jetted properly they would ************in rocket on an ea81.the q-jet is a pretty picky carb man,if you picked it because you know it then,i'll shut up.but if you picked it because it is so common then and easy to find,well...you might want to talk to some older cats that have run it for 20 some years.i would not use that carb to save my life.i would go with a smaller holley or weber.yournot gonna use all those cfm's anyway.it will be a waste of fuel,and money.

People have modded the SPFI intake as it seems to be the best flowing of the single port head intake manifolds. The EA81 D/C flows probably about the same - the manifold isn't so much the problem as the heads and valves. The D/C heads have the same valve arrangement as the EA82, Larger valves, different cam, and dual exaust ports too.

 

The best setup would really be to just slap two carbs on - one on each head. Much easier to fab the "manifold" as there wouldn't be one - just two carbs, and a cross-over vacuum hose to equalize pressure. WAY easier to cast or mill, and you just need a hose for the coolant passage. Plus it all fits under the hood. If you are going to the trouble - thats the way to go IMO.

 

GD

Thanks for the input. I am not sold on which carb to use. I might see about slapping a 4 barrel adapter plate on the two barrel and closeing off the two small ones