Skip to content
Aussieveedubbers

Subaru EA81 single point fuel injection

0 likes
Share Share on Facebook Share on X Share on Reddit
Log in to reply

tweety Wolfsburg Wizard

460 posts · joined Feb 2011 ·

#965639
Regular readers will know I have taken a leaf from our mate "Joel" ...'blowing the bug' thread and supercharged Tweety's EA81 engine. A breif run down on that-

Used a sC12 draw through at 5 psi Dellorto 40DHLA carb, cut in half and then shortened a manifold from a Datsun Lynx unit, fabricated the rest. Those interested can read the thread Supercharged eA81 in trike.



A few things- firstly my conversion from 1916cc to Ea81 had one flaw- I had a type 3 auto that dyno figures revealed it zapped 14 hp off the engine. I posted the readouts on that thread but basically NA was 74hp at the fly and 59 at the RW. SC12 was 82 at the fly and 100 ATW. But the economy was terrible...too bad for my happiness. 18-19mpg not towing our van. Hence my desire for efficiency in all meanings.

In Australia Subaru did not bring out their eA series engines with fuel injection. In the states they were everywhere in the similar EA82 espeically in California where it was favoured as that state had anti pollution laws that led the world.

The Ea series had a single point fuel injection set up not dissimilar to a Hitachi system here around 1990 in some Nissan utilities. The latter had two injectors, the subie just one.

The Ea82 SPFI has a similar manifold (but not the same) to the EA81 and will fit the EA81 engine. It has a different dizzy that can be modified by raising the gear up the shaft and using a turbo mount. A few other mods like rotating the idle sensor so it doesnt hit the dizzy, linkages, installing the loom, ECU, gringing off 3mm from the top of the block halves, and high pressure fuel pump, a return line to the tank and O2 sensor is pretty straight forward stuff.

It all seems a maize at first but after you get on the net and google EA81 SPFI conversion you will see a few guys have write ups on the whole proceedure. Thanks to them.

Currently I've installed everything except the loom. For vw owners the SPFI throttle body is fairly compact. I imagine it would suit a beetle owner well.

The only mod that should be done to the engine is raising the CR from 8.7:1 to 9.5:1, something I'll do next year with my spare engine when it is fully recoed. I'm hoping for far better economy. The EA82 SPFI engine made 90hp. Close would be good.

To purchase the kit is not easy. I was lucky in that a guy imported one and lost interest.



www.youtube.com/watch?v=HXwh4z8d66o
SUBARU ea81, VW auto, Detour camper
My ex girlfriend said "its me or a trike". Her big mistake.

nils Fahrvergnugen

971 posts · joined Jan 2008 ·

#965664
Think the old camira had a single point injector? .........Though it was a nissan motor i think, always thought that it might make a good base for a simple fuel injection set for a beetle motor
Quit calling rust patina

tweety Wolfsburg Wizard

460 posts · joined Feb 2011 ·

#965692
yeh Nils, the camira SPFI is possible to fit to some engines. Easier to do it this way though- with the EA82 manifold. But the option is there.
www.youtube.com/watch?v=HXwh4z8d66o
SUBARU ea81, VW auto, Detour camper
My ex girlfriend said "its me or a trike". Her big mistake.

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 ·

#965696
Gday Tony, been keeping an eye on your thread, it's coming along nicely.

Many many moons ago I looked at fuel injecting my 1776 engine by either megasquirt or adapting some mainstream car system.

The AC Delco setup from all the Opel based cars (Camiras, Daewoos and N13 Pulsars/Astras) lends itself well to conversions and is extremely adaptive both in single point and multi point

I'll be interested to see how happy you are with it once it's up and running, the only reason I didn't finish mine was I worked out for almost the same cost I could fit the entire subi engine which was bigger and more modern and already had EFI.

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#965697
you can use early 3.9L EA falcoon twin barrel TB with SPFI.

Should find heaps of those at the tip.

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#965698
Joel wrote:Gday Tony, been keeping an eye on your thread, it's coming along nicely.

Many many moons ago I looked at fuel injecting my 1776 engine by either megasquirt or adapting some mainstream car system.

The AC Delco setup from all the Opel based cars (Camiras, Daewoos and N13 Pulsars/Astras) lends itself well to conversions and is extremely adaptive both in single point and multi point

I'll be interested to see how happy you are with it once it's up and running, the only reason I didn't finish mine was I worked out for almost the same cost I could fit the entire subi engine which was bigger and more modern and already had EFI.
^ Haven't I said that heaps of times before already?

and its Delco not AC Delco, 2 different things

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

ian.mezz I never said, I could write or spell

3,913 posts · joined Sep 2004 ·

#965722
😊

http://www.gumtree.com.au/s-ad/woolgoolga/engine-engine-parts-transmission/subaru-engine-ea81t-rare-suit-brumby-vw-aircraft-trike-gyro/1018503980

One complete Engine.

1800 Turbo Fuel Injection , Hydraulic Lifters , Double Valve springs , Bigger valves,Electronic Ignition . Aviation standard motor , suit kit aircraft.

Importer documented it had done 5200 km before it was written off in Japan.

From a Brat coupe.

Suit Gyrocopter. Have run one in a Kombi and Dyno recorded 152 HP , specs say 110 HP.
Excellent conversion for VW Buggy , Beetle/Kombi (Sherman Adapterplate and flywheel kit Available Extra) or put your trike on steroids.
Also have 2nd engine that needs work , will sell both for $3000 , freight at your cost.

Brilliant conversion that is a lighter powerplant and won't destroy your gearbox, touque in low revs great for offroad use. gaskets , rings , bearings and most parts still available cheap as old stock still on the internet. Many parts common to standard EA81.

Call or text , text and I can ring you at my cost. Reluctant sale

Notice blue 'Subaru" oil filter fitted in factory in Japan , this engine never made it to its first service. test Report from Importer for compressions . blowby , oil pressure ect.

Google Images EA81T and image with orange kombi in shed in the background shows reconfigured Subaru symetrical head swap, exhaust and intake reversed to bring turbo compressor to the rear allowing short exaust out of any rear mount conversion , neat and tidy compact conversion.
😂🤪😂🤪😂
car forums. where a lot of peoples good intentions end up taking a good old car off the road forever never ever to see the road again. 🥲

tweety Wolfsburg Wizard

460 posts · joined Feb 2011 ·

#965746
mmm nice. its has hit the Ausbaru forum ian.mezz. lol.

I like to see my engine though. would be a hoot!!
www.youtube.com/watch?v=HXwh4z8d66o
SUBARU ea81, VW auto, Detour camper
My ex girlfriend said "its me or a trike". Her big mistake.

tweety Wolfsburg Wizard

460 posts · joined Feb 2011 ·

#970388
The SPFI system has been running a while now. Have had soem issues. Not having ever dealt with fuel injection- its a steep learning curve.

The Subaru sPFI ssytem is hailed by many as a simple early system that gets the job done- the job of monitoring fuel/air ratio based on sensors and a single throttle body and sole injector.

The sole symptom is low top end speed and power. The 3 speed VW auto is operating fine. In the first two gears the engine revs out nicley then in 3rd it wouldnt go over 100kph.

The injector was cleaned by a pro and he told me he "suspects a poorly operating MAF. The mass air flow sensor has a primitive but effective enough hot wore system, located in a small hole of a venturi between the air filter and the TB. as air passes thru it a measurement is taken of the air capacity and the computer sends out a message to the inejctor to release the fuel amount. A faulty MAF will tell the computer to release less fuel than desired. Being only released in the USA I had to seek out a new MAF. The first one was without the housing- of course the housing was different. Now I bought another with the housing (www.rockauto.com you should do yourself a favour and search for parts here for anything...it will consume days of your life!).

The throttle position sensor is another unit that was under suspicion. This unit has zero resistance at idle and slightly above idle. then varies in resistance to wide open throttle WOT wher eit is suppose to be 2400 ohms (according to the manual). However mine was 5000 ohms. It has adjustment on the TB and so it was and I gained 10kph top speed. Sound little significant but all these things add up to a smoother engine and solving issues to do with a 30 year old system and hell knows how long it has been since it was operating in a car.

Getting a SPFI kit isnt easy in itself. Luckily I got mine in Melbourne form a guy that lost interest. The kit coems with different and modified dizzy, loom, ECU and fuel pump etc. A few resistors are provided to cap off some loom ends where solonoids or sensors are not required like the EGR for Califormia anti pollution laws.

So even though I knew nothing of the system I've picked up many details that will get me through also with the help of Ausubaru and USMB Subaru forums.

It wont have the power of the supercharged engine but it will have the economy and efficiency.

First start up.



The MAF ordered.




By the way guys, a friend of mine from taralgon Vic owns a VW trike. He got his injection system installed by this mob and is very happy with it.

http://www.efihardware.com/
www.youtube.com/watch?v=HXwh4z8d66o
SUBARU ea81, VW auto, Detour camper
My ex girlfriend said "its me or a trike". Her big mistake.