EA81 power addition for Brumby

Jason.Rheinberger · Post by **Jason.Rheinberger** » Mon Mar 01, 2010 8:11 pm

Hi All
What can i do to an EA81 for under $1000 to get a little more power out of it

Also what year model brumbys had EA82 in them and what is the difference between an EA1 and a EA82

RSR 555 · Post by **RSR 555** » Mon Mar 01, 2010 8:29 pm

I found a weber carby and a good flow exhaust gave a cheap and powerfull upgrade to the EA81

EA81 = 1.8 OHV (one camshaft with pushrods)
EA82 = 1.8 OHC (two camshafts in the heads)

And Brumbys only came with the EA81 because the EA82 was very wide due to the overhead cams

Gannon · Post by **Gannon** » Mon Mar 01, 2010 8:34 pm

Jason.Rheinberger wrote:Hi All
What can i do to an EA81 for under $1000 to get a little more power out of it

Basic tune up (spark plugs, ignition leads, distributor cap) can go a long way.

A Weber carby is also a good upgrade and can be had for less than $500
ebay.com.au/Subaru-Weber-carburettor-power-up-kit

Also upgrading the exhaust from the Y pipes back with a 2 inch straight through system can free up a bit of power too.

Also what year model brumbys had EA82 in them and what is the difference between an EA1 and a EA82

None, all Brumby's had EA81's

Jason.Rheinberger · Post by **Jason.Rheinberger** » Mon Mar 01, 2010 8:46 pm

thanks guys
here is my problem

currently have an EA82T in my brumby. all modification had been done before i purchased it
the down side is the EA82t is sick and i want to replace it

I have a decent EA81 in the shed which i was thinking about puting back in with a few added power options but from what i have read on the forum that looks like it might be costlsy as everything has to be converted back

I have have a mate with a nice ej20 in the shed as well which i also though about putting in

I guess what i am getting at is what is going to be the easiest and most cost effective fix to this poor little brumby

RSR 555 · Post by **RSR 555** » Mon Mar 01, 2010 8:54 pm

Hardess would be the EJ conversion but it would be the ultimate power increase. Easiest would be to fix the EA82T that is in there now (depending on why it's sick?). I think that putting the EA81 with a weber and good exhaust would be the best option if you don't want many headaches, they seem to be builtproof and really easy to fix if you're ever stuck on the other side of the black stump.

Jason.Rheinberger · Post by **Jason.Rheinberger** » Mon Mar 01, 2010 9:14 pm

but going back to he ea81 would mean a few mods to change it back wouldn't it

Jason.Rheinberger · Post by **Jason.Rheinberger** » Mon Mar 01, 2010 9:16 pm

woudn't belive it but i did break down in front of the black stump near coolah in my falcon a few weeks ago

gtcompletepower · Post by **gtcompletepower** » Mon Mar 01, 2010 9:25 pm

if you want a reliable brumby go back to a ea81 motor if you have it and its good it cost you nothing put a cam in it with a grind of 23/63 this grind will work from 700rpms on cost $150-$180 dont stuff around with a weber get a carby off a auto as it has bigger jets and you wont use as much fuel and it will bolt straight on $50 plus a kit if needed $50

RSR 555 · Post by **RSR 555** » Mon Mar 01, 2010 9:47 pm

The auto carby is a increase but nowhere near the power increase made by the Weber. Fuel costs using the Weber really only high if you're giving the car full revs all the time. In most cases we find that EA81s fitted with a Weber they get better economy due to not having to work the engine hard to get it moving. Most of the guys that are using the cars offroad prefer the Weber over other carbies.

gtcompletepower · Post by **gtcompletepower** » Mon Mar 01, 2010 10:18 pm

you are right about the power with the weber but the cam would eliminate the need for the weber i have a ea81 with twin hitachi carbys a 23/63(this grind has response as soon as you hit the pedal) it hammers and i drive hard and get around 480 ks from 45 ltrs if you buy a weber for 4-5 hundred or second hand one for $100 and have it rebuilt $200 thats not just to kit it the guy wants a cheap option i would rather go for the cam as its a 1 off cost instead of the weber as thats a larger outlay and on going cost

steptoe · Post by **steptoe** » Mon Mar 01, 2010 10:34 pm

To go from EA82T to any EA81 - you'd hate yourself for picking a figure like one thousand dollars to fix your problem. Get another EA82T or bits to fix yours up, is what I would do XXXdid. As for my twin carb EA81 Brumby - the battery has gone flat and won't take a charge in demonstration that I have not driven it much in three months or more

spike · Post by **spike** » Tue Mar 02, 2010 9:05 am

mmm dual carb....... droools
if only it was an ea82

RSR 555 · Post by **RSR 555** » Tue Mar 02, 2010 6:41 pm

gtcompletepower wrote:you are right about the power with the weber but the cam would eliminate the need for the weber i have a ea81 with twin hitachi carbys a 23/63(this grind has response as soon as you hit the pedal) it hammers and i drive hard and get around 480 ks from 45 ltrs if you buy a weber for 4-5 hundred or second hand one for $100 and have it rebuilt $200 thats not just to kit it the guy wants a cheap option i would rather go for the cam as its a 1 off cost instead of the weber as thats a larger outlay and on going cost

Hi gtcompletepower.. If you have the twin carby EA81 then you're going to get a lot more power from it because they are completely different from a standard EA81. Like you said the Cam is different but this mainly due to the ports in the heads. They have a lot better setup than the normal EA81. Inlet and Exhaust ports are completely different configuration.

The OP was trying to keep costs under $1g and I can't see changing the cam will keep this below the figure? but if he does have a little more to spend on the EA81 then I'd go with the cam, weber and exhaust setup

RSR 555 · Post by **RSR 555** » Tue Mar 02, 2010 6:44 pm

spike wrote:mmm dual carb....... droools
if only it was an ea82

Hey Spike.. just use your EFI heads and put 2 twin throat carbies on each end

steptoe · Post by **steptoe** » Tue Mar 02, 2010 9:09 pm

as far as cams and EA81's go.... My 16/56 was a great all rounder. I initially asked for 20/60 and got 16/56 based on cam mans experience, sort of got no choice. So,... next EA81 I built I specifically asked for 20/60 and no less - got 20/60 and also got a power loss or just breathless at 80 or 90kph with a decent load or towing. Next time, if there is ever one , will be 16/56 again.

Twin carb manifolds fit EA82's too

gtcompletepower · Post by **gtcompletepower** » Tue Mar 02, 2010 10:57 pm

i didnt say i had dual port heads because i havent but i still think a cam and a auto carby would be the most economical way to go if he can do the work himself as it would cost under $300 which is well below $1000 and what the guy wanted to know was what he could do to improve his power for under $1000 but if he wanted to spend he could probably do a bit of both. if he knows wreckers that have fiats they have twin 38mm down draught webers if he got 2 sets and put 1 per cylinder i thought about doing it Conclusion everybody has a different opinion.

RSR 555 · Post by **RSR 555** » Wed Mar 03, 2010 12:43 am

steptoe wrote:as far as cams and EA81's go.... My 16/56 was a great all rounder. I initially asked for 20/60 and got 16/56 based on cam mans experience, sort of got no choice. So,... next EA81 I built I specifically asked for 20/60 and no less - got 20/60 and also got a power loss or just breathless at 80 or 90kph with a decent load or towing. Next time, if there is ever one , will be 16/56 again.

Twin carb manifolds fit EA82's too

As long as they aren't EFI heads

Thanks for the info on the cams. It's good to get feedback about different cams. Would the 20/60 work more efficient if the heads were ported?

RSR 555 · Post by **RSR 555** » Wed Mar 03, 2010 12:47 am

gtcompletepower wrote:i didnt say i had dual port heads because i havent but i still think a cam and a auto carby would be the most economical way to go if he can do the work himself as it would cost under $300 which is well below $1000 and what the guy wanted to know was what he could do to improve his power for under $1000 but if he wanted to spend he could probably do a bit of both. if he knows wreckers that have fiats they have twin 38mm down draught webers if he got 2 sets and put 1 per cylinder i thought about doing it Conclusion everybody has a different opinion.

Touche..

steptoe · Post by **steptoe** » Wed Mar 03, 2010 9:34 am

I have an old magazine on Mustang upgrades. Amused to see that back in the day when the US sold six pot Stangs (erk!!) mods were to machine a flat on the front and rear of the top of the log manifold and bolt on two more carbies making them fire breathing triples on a six pack! The EA manifolds look like they have the potential to block off centre hole machine a flat and weld an adaptor plate to each end leaving alternator clearance.... Find an old manifold, an old machine shop guy and have a chat?????

discopotato03 · Post by **discopotato03** » Wed Mar 03, 2010 11:28 am

I believe later EA81's had larger valves so thats worth looking at if you don't have them .

A .