EA81 supercharger revamp by Tweety

steptoe · Post by **steptoe** » Wed Jun 19, 2013 7:17 pm

apart from where he says the EA82 spfi manifold won't fit an EA81. Don't panic Tony, think they do, if EA81 twin manifold fits EA82 just thermostat and outlet is other side, up front instead of out the back

Tweety · Post by **Tweety** » Wed Jun 19, 2013 7:45 pm

Yeh Jonno thought that myself. its a good read and reference for my conversion. Noticed the thermostat housing pointing out the front. Reverse the top of that housing and an EA81 lower radiator hose fits nicely going over the manifold and points towards my 30mm SSteel tubes that go to the radiator up front. and will look more tidy.

I took my valve covers to a place for chroming today $130 EACH!!! think a can of black paint from the $2 shop will suffice lol

Subydoug · Post by **Subydoug** » Wed Jun 19, 2013 7:59 pm

YELLOW Tony! With matching pullies and sump cover!

Tweety · Post by **Tweety** » Wed Jun 19, 2013 8:22 pm

Tweety's paint theme is safety yellow and black. My engine builder said the head studs and nuts etc will be black (expensive ones dont know the name of them). Against the yellow will look nice. So need black on the valve covers me thinks. Yellow covers and pulleys. yuk!

Besides Rosie our Foxy doesnt like too much Yellow...

YouTube · Post by **El_Freddo** » Thu Jun 20, 2013 10:45 pm

I think you need a set of chromed rocker covers... but that's me and it's not my money! My thoughts are that the black and chrome will relate better to Tweety than just a black set of covers - could be that "one up" detail that people actually notice.

I couldn't find any chromed rocker covers on US ebay

Cheers

Bennie

Tweety · Post by **Tweety** » Fri Jun 21, 2013 7:38 am

Can always get them done later on. Once my wife gets over the cost of Tweety's welding and new engine and...and...

Tweety · Post by **Tweety** » Fri Jun 21, 2013 7:42 am

O2 sensor?

Tweety's SPFI conversion to be commenced in the near future. Tweety has a unique one off exhaust system. The pipes exit the exhaust manifold to go about 400mm to where the two pipes have a conencting pipe. The indiviaual pipes the each go to a good muffler then a U-turn single pipe then to two pipes each side.

Can we place the O2 sensor inside one of these pipes, presumable near the U-turn after the muffler.? or does anyone know the best location?

Subydoug · Post by **Subydoug** » Fri Jun 21, 2013 9:22 am

Geez, shot me down there

. Im doing Black with red covers and pullies....only to cover it up with a bonnet

.

O2 sensor, hmmm how far is it to the joint in the pipes from the cylinder heads? and how far away was it on the stock setup. You'd be surprised at how slowly an o2 sensor responds

. Best bet would be to match the original. If it was anything like the mpfi you looking at around 15-20 inch's downstream. I wouldn't be too worried about it ending up in only one side of the head. Should be fine for a narrow band o2. Just my thoughts though, someone may know better.

Regards

Doug

steptoe · Post by **steptoe** » Fri Jun 21, 2013 4:35 pm

Gees, a thought , is thread on O2 sensor same as the spark plugs? Coz I think the EGR holes in the cast iron adaptors of later EA81 were spark plug threads - one each side straight out the gate ?

Subydoug · Post by **Subydoug** » Fri Jun 21, 2013 8:17 pm

That's a pretty good thought Steptoe, but Im pretty sure o2 sensors are an 18mm thread where spark plugs are more like a 14mm thread. Only takes 10min to turn up an adapter in a lathe though

.

Doug

Tweety · Post by **Tweety** » Fri Jun 21, 2013 8:33 pm

EGR? Cast iron adapters? me no understand. Pauline asks "please explain".

steptoe · Post by **steptoe** » Sat Jun 22, 2013 7:54 am

The later EA81 was optioned with cast iron exhaust port extenders both sides that fitted between head and exhaust pipe flange. Think dizzy side had nought holes or pourpoise, was the heater side that had maybe not exhaust gas recirculation stuff - maybe it was for the odd reed valve dump extra air in the exhaust thing. Anyway, if you found one, may find the thread in it is same as spark plug and O2 sensor...just thinking out loud - please excuse if it is all BS h?

tambox · Post by **tambox** » Sat Jun 22, 2013 6:11 pm

I had those adapters on my late model Brumby, till I swapped the motor, other motor did not have them and the exhaust studs were in the opposite positions.
There was an air bleed pipe coming in on the LHS, cannot remember the thread. It could be adapted to an oxy sensor if required.
This would only give you single side readings, the OEM computer is designed for all four exhaust readings, what difference that will make???, probably none as long as all everything is working correctly.
Neat and simple.

Tweety · Post by **Tweety** » Sat Jun 22, 2013 10:05 pm

Interesting guys. As my trike didnt need anti pollution gear I chucked a lot of stuff from the engine on conversion. And that pipe on the Alt side of the exhaust was plugged about 100mm from the exh manifold. Will look into using that for the O2 sensor.

I noticed today that the MAF sensor is in its position on the snorkel. But there is no loom from it. On pics on the net I see the loom goes directly to the inner guard somewhere, not to the harness behind the TB. I need to know where the 3 wires go to from the MAF.

steptoe · Post by **steptoe** » Sun Jun 23, 2013 8:15 am

call me petty but not going back to look at your MAF , it's flapper not hot wire? More than three wires surely ?

Tweety · Post by **Tweety** » Sun Jun 23, 2013 9:27 am

This is the part that doesnt have wires to it. I assume its the MAF.

see the three connections?

catn see a flapper

Post by **TOONGA** » Sun Jun 23, 2013 10:50 am

Yes thats the MAF

Im wondering if you have the documents on this page

http://jdmfsm.info/Auto/Japan/Subaru/--Old%20Models--/

brumbys never had an O2 sensor (in Australia) but if they did it would have been on the front of the cat if you put a bung on the first join of your exhaust system, where the 2 engine pipes combine it will work.

TOONGA

Tweety · Post by **Tweety** » Sun Jun 23, 2013 11:08 am

Yes Toonga a bung before the cross over connecting pipe would be the spot I agree. About 300mm from the exh manifold outlet.. Could run the wire up to the oil sender clip and under the manifold. Read how some eCU's blow up because the O2 wire shorts out. So has to be insulated well. EBAY have O2 sensors for $45 single wire type as this is.

And do you know where the wire for the MAF come from? have put a thread on the USMB for this. the Americans are more familiar eh lol

Post by **TOONGA** » Sun Jun 23, 2013 11:22 am

Tweety do you have this document http://jdmfsm.info/Auto/Japan/Subaru/-- ... ection.pdf
from that subaru server

It has schematics for the SPFI system and plenty of information on the set up process, even the wiring for the AFM or MAF

PS that looks to be a hotwire AFM not a flapper MAF

TOONGA

Tweety · Post by **Tweety** » Sun Jun 23, 2013 11:28 am

Jules....those manuals are of great help. the vacuum system is telling me a lot about the solonoids etc as well

thanks