aus engines

Gannon · Post by **Gannon** » Wed Dec 08, 2010 5:15 am

Yeah the EA82T block is exactly the same as the NA MPFI block (with the crankcase vent at the back as Jono pointed out), it just used dished pistons.

MPFI EA82's from the Vortex with the spider manifold also had a knock sensor.

discopotato03 · Post by **discopotato03** » Wed Dec 08, 2010 8:35 am

I think Coxy dug up parts of a manual for EA81T engines and its surprising how many of its externals look like EA82T bits .
From memory the header and turbo look very similar , I think the main turbo difference is no water cooling on the 81T .
I think the turbo to TB duct is similar and correct me if I'm wrong but the 81T power steering pump is more like EA82 than the agricultural looking setup most 81's have .
One thing some 81's got which was sadly lacking on 82T's is an oil cooler which I reckon every turbo engine needs - even if its a water/oil heat exchanger type . My R33 Skyline has a water type one and the Evo 6 being a homologation special basis has a healthy sized oil to air cooler with a bypass thermostat arrangement .

That aside I think the holy grail of EA81's is the 1800 twin carb one because I believe it makes more power than the 81T and being carbureted is a heap simpler and cheaper to set up than EFI . No computer or high pressure fuel system to give you grief and these engines are no harder to freshen up than any other EA81 . If you had all the factory filter and throttle linkage bits I think these engines'd fall into an MY/MA , and wouldn't be a backwards step in an early carbureted L series .
I'm pretty sure the carbs hide neatly under the factory air filter case so these engines look pretty innocent to the average Joe .
The only thing that may be a concern could be the fuel consumption because often performance carbureted engines particularly from that era are not real miserly . Still compared to an expensive non std EFI turbo conversion the long term costs could be in favor of the TC EA81 .

A .

78sti · Post by **78sti** » Wed Dec 08, 2010 10:30 am

EA81T Blocks are different to EA81 blocks due to the hydraulic lifters (much bigger), Same reasion they are quiter.

holy grail of EA81's is the 1800 twin carb one because I believe it makes more power than the 81T

A ea81t will make much more power than a dual carb with a few mods. The best thing you can do fore these engines is to throw the turbo in the bin and put a later ea82 turbo on. (externally the same)

One thing some 81's got which was sadly lacking on 82T's is an oil cooler

I have never seen an oil cooler on a ea81t engine, so maby the very early ones?

I think the main turbo difference is no water cooling on the 81T

The latter EA81t engines do have water cooling on the turbo, I have had both engines.

78sti · Post by **78sti** » Wed Dec 08, 2010 10:34 am

Also the power steering and ac setup on a ea81t is very similar to a ea82. The only difference in the pump is that the ea81 has a bush where the ea81 has a bearing on the front so they are not a direct swap.

The standard ea81 power steering cannot be used due to interference with the turbo.

spike · Post by **spike** » Wed Dec 08, 2010 1:38 pm

ok now some EA81 head questions

I know about the small and large valve differences and how to identify
But the turbo heads and duel carb heads were they duel intake ports??

78sti · Post by **78sti** » Wed Dec 08, 2010 1:45 pm

The only dual port ea81 heads I have ever seen were aftermarket for ultralight aircraft and very expensive.

The exhaust port on the dual carb motors was much bigger (oval shaped)

The only difference on the turbo heads is the injector ports and water and oil return lines ect.

spike · Post by **spike** » Wed Dec 08, 2010 2:35 pm

long shot here
volume of the standard radiators
Anyone know?

spike · Post by **spike** » Wed Dec 08, 2010 2:40 pm

long shot here
volume of the standard radiators
Anyone know?

FujiFan · Post by **FujiFan** » Wed Dec 08, 2010 7:30 pm

Do you mean thermal capacity ie KW or BTU or volume of coolant to fill?

spike · Post by **spike** » Wed Dec 08, 2010 7:44 pm

jeeez i dont want to go that in depth
Volume of liquid.

spike · Post by **spike** » Wed Dec 08, 2010 9:00 pm

more qs

auto trans for the EAs can the transmission lock mod be done?
wheel id information required- see the thread in wheels and tires
did any other countries get a low temperature thermostat from factory? a fairly personal question but one which may come in handy, im not a fan of using after market thermos ive had problems and so have others but maybe soomewhere like saudi arabia got a lower temp thermostat and yeah

and finally
is anyone else using the 81 or 82 (prefer 81) for offroad or looking at building one. im doing a case study on my engine but its for a high reving rally car and the ideas for building two different engines are worlds apart

Post by **TOONGA** » Wed Dec 08, 2010 9:24 pm

you may want to look at this site if you haven't already Spike

http://www.indysworld.com/80s/

as for thermostats 3 are listed for the ea81 ( that I know of) 170f, 180f and 190f all were available in the US due to temperature ranges

TOONGA

spike · Post by **spike** » Wed Dec 08, 2010 9:31 pm

yep toonga
i have read the wheel guide of indysworld but i just feel it would be wrong and potentially illegal to use the images off the site.

ill try and get in touch with whoever runs it

FujiFan · Post by **FujiFan** » Wed Dec 08, 2010 9:35 pm

What a range of wheels, nice 1 TOONGA. Could spend hours drooling over what is now to small/out of date

spike · Post by **spike** » Wed Dec 08, 2010 9:52 pm

strangly enough i dont think i saw the subaru mini lite style things, came on the rx rally model if im right

steptoe · Post by **steptoe** » Wed Dec 08, 2010 10:12 pm

I have got or had a block with hydraulic lifters in the EA81 and they were not much bigger at all, did the turbo EA81's have something different again then?

A Brumby radiator is about 40mm shorter than a MY FWD

spike · Post by **spike** » Wed Dec 08, 2010 10:25 pm

are we talking valves steptoe??
From what i read everything after 83 had larger valves, and everything after 84 had hydraulic lifters. The exhaust valves are only 2mm bigger than previous and gave an extra 1 hp

But i found out from the source heads were mixed and matched so much, one guy brought a set and had one large and one small

steptoe · Post by **steptoe** » Thu Dec 09, 2010 12:45 am

according to Subaru in Australia no EA81s came into australia with hydraulic lifters/cam followers - were all solids. Imported as used engines with low kilometres may well have. I had one that was an API import that did and the block had sleeves for the lifters and solids did not , not interchangeable blocks, and the pushrods had different size oilers too and were not to interchange them either as I read here.

discopotato03 · Post by **discopotato03** » Thu Dec 09, 2010 2:24 am

I think you'll find that the twin carb heads have the inlet and exhaust valves the opposite way around in the chambers compared to single carb ones .
There's a good chance that the cam profile was a little warmer and the CR a bit higher than the more mundane 81's .
Yes the exhaust ports are larger and interestingly the port divider comes right out to the flanges face . You could actually make a four primary type header up for these engines which would make them scavenge better and sound more like an inline four due to the corrected exhaust pulse timing .

A .

Loyale 2.7 Turbo · Post by **Loyale 2.7 Turbo** » Thu Dec 09, 2010 4:07 am

spike wrote:pretty simple question but i imagine ill get a lot of responses
Did aus get the ER27, XT6 engine in anything??
...

The XT6 was sold in USA and Japan Only.

Here in my Country, +/- 75% of the Cars came from USA (we're very Near) so we have some XT6's

Kind Regards.