The Twin carb conundrum!

Silverbullet · Post by **Silverbullet** » Fri Jan 27, 2012 5:32 pm

Lately I've been alot more aware of the EA81 twin carb situation in Australia and how everyone wants the complete engine, how rare they are etc.

But more recently I've been thinking, how rare are they really? I know they didn't come out in Australia, I know they are sought after but I don't know how many complete setups there could be (running or otherwise) in the country. Today I've seen PhantomD has one being rebuilt as we speak, I'm pretty sure TOONGA has one since he has all the pics? steptoe has told me of another old member who sold his setup (hugheybabes?) and there was that manifold on ebay a while ago. Oh and my recent acquisition of course

And there has been a number of posts by new usernames over in the classifieds asking for complete setups.

So how many others do we know of? And how did they get here in the first place?

steptoe · Post by **steptoe** » Fri Jan 27, 2012 6:43 pm

Not to mention a member pre - AUSub crash 2005, told of their worth.He had one or was it just the carbs? in his wagon - left at a mates place for need of space. Got crushed for need of space

Silverbullet · Post by **Silverbullet** » Sat Jan 28, 2012 2:51 pm

steptoe wrote: left at a mates place for need of space. Got crushed for need of space

Oh no!

I'm wondering if some of the engines around the place that we know of are infact the same engine popping up in different places? They could be moving around a fair bit.

Post by **Captain Obvious** » Sat Jan 28, 2012 5:46 pm

i had twin carbs in my wagon years ago that my old man got, he rebuilt a brumby motor with a different cam and them put the twin carb set up on it, i ended up with the car then wrecked it when i bought my RX, sold the carbs to another memeber i think it was stinky (paul) and the motor to a suba club member for his brumby that then got EJ'd and sold!!

bryan

phantomD · Post by **phantomD** » Sat Jan 28, 2012 5:53 pm

Hard to find one of the twin carb engines that hasn't been modified/thrashed beyond repair and/or ended up inside an aircraft.

YouTube · Post by **El_Freddo** » Sun Jan 29, 2012 8:48 pm

phantomD wrote:Hard to find one of the twin carb engines that hasn't been modified/thrashed beyond repair and/or ended up inside an aircraft.

Hit the nail on the head with that statement!

I don't know if this really is a conundrum, maybe more a point of curiosity - the conundrum would be how to get more EA81S engines when only x amount were shipped to Australia in the first place...

Maybe reverse engineer the heads and inlet manifolds

There weren't really any differences in the block were there? My thinking says not, just other parts such as cam/heads/inlet manifold. Pretty simple equation really

Cheers

Bennie

steptoe · Post by **steptoe** » Mon Jan 30, 2012 8:13 am

thought I saw mention of different rods to handle the revs ?????

Matt · Post by **Matt** » Mon Jan 30, 2012 8:13 am

The blocks are the same, cam and heads are different, And i mean the heads are way way way different. I have some pics somewhere last time mean where out.

discopotato03 · Post by **discopotato03** » Mon Jan 30, 2012 4:50 pm

Jees even I was having silly thoughts today , maybe clean Brumby with some of Ellies vitals to swish it up a bit .
No doubt one of those twin carb EA81 engines would make it a little more toey as a street car . Hmm , the AWD trans with the LSD n' disc brakes ...
Sigh , an I was so looking forward to escaping the 1980s .

Must drive Skyline and Evo more often - simplist fix . But then Coxys ute is so handy - why is life so hard ?

Silverbullet · Post by **Silverbullet** » Mon Jan 30, 2012 4:58 pm

El_Freddo wrote: I don't know if this really is a conundrum, maybe more a point of curiosity

Thanks Bennie that's a better word, but there's still a conundrum in the topic

As for modding a normal EA81 I can guarantee it's been talked about before, maybe someone's even tried it. Would be very difficult though, swapping the valves around and then the stock cam would be all wrong.

YouTube · Post by **El_Freddo** » Mon Jan 30, 2012 8:01 pm

Silverbullet wrote:As for modding a normal EA81 I can guarantee it's been talked about before, maybe someone's even tried it. Would be very difficult though, swapping the valves around and then the stock cam would be all wrong.

You would need the EA81S heads, intake/carbs and the cam - there's no way you could do it without splitting the case, which means that you might as well do a full rebuild...

At least you know you can grab an ordinary EA81 block if you've got an issue with the EA81S block that you can't fix/get around.

Cheers

Bennie

Brumby Kid · Post by **Brumby Kid** » Mon Jan 30, 2012 8:13 pm

Or, grab an EA81,
And make an adapter plate for two carbies rather than 1, keeping the current manifold.
Yes i know it's not a true twin carb were they sit above the heads and it's one per head.
But it's two carbies!!!

coxy · Post by **coxy** » Mon Feb 20, 2012 9:35 pm

Uh Dual Carburetor EA81's use a pair of twin throat mechanical secondary Carburetors and they do not sit above the ports.
There is maybe 60mm~80mm between the carbs and they fit under an air cleaner housing with the same outside dimensions as a single carb motor.

If I was going to do anything about modifying a normal EA81 type head I would modify it to Multipoint Injection,You can buy weld on Alloy injector mounts and such a short fuel rail would be easy to either fab or modify from something else,then an aftermarket computer and a throttle body fitted to a stock manifold or even two throttle bodies,not that difficult to do and should bring reasonable improvements.

steptoe · Post by **steptoe** » Tue Feb 21, 2012 7:55 am

someone here used a Camira FI set up on EA81? years back I think. Shees, chances of finding anything Camira at the wreckers would be slim ! Near twenty years ago a car yard had a sign up stating "Sorry, we do not take Camiras as trade ins". A very flexible memcal computr in them though I read.....

Then there is the old six cylinder Mustang trick in the US where they had one carby and machined two more flats on the manifold new hole and some mounting studs and suddenly three carbies to play with