Doug's EA81 Rebuild stuff.

Subydoug · Post by **Subydoug** » Tue Jun 04, 2013 7:43 pm

niterida wrote:Off topic but frying these things is easily done.

I got a non-working amp and was testing it to see what was wrong and just touched the multimeter to the wrong terminal as I was moving my hand and pffft blown completely and ended up in the bin

I also just replaced the motherboard in my PC - direct identical replacement not an upgrade or anything - and when I turned it on it went snap,crackle and pop and a big puff of smoke came from the board
Bizarrely though it still actually works fine

If it smelt horrible, and I mean horrible, its most likely a cap that went, probably because of too much voltage somewhere? Id look up the data sheet on the motherboard and compare it to the PSU's spec's. Probably still works because the circuitry after the cap that popped can handle the higher voltage.

Don't feel too bad but. Being someone who manufacture's electronics, well, lets just say when you've blown up a few grand within a 30min "retard" moment, then you will know how it feels

.

Regards

Doug

Subydoug · Post by **Subydoug** » Sun Jun 09, 2013 5:09 pm

Hey all,

Just a quick update for the followers. Noticed that, sometimes the amount of "fuel" I needed to feed it was fluctuating pretty dramaticly over longer periods of time. Had a look at my trigger signal from the crank sensor and bingo, all over the shop. Some of the triggers are perfect, some are small, some are large. It reeks of constructive/destructive interference to me. Started having a look at filtering it a bit but decided to go back to plan A and use the points to trigger the injector. So I made up a filter and spike suppressor circuit, wired it up and bingo, after a few firmware revisions Its now firing the injector when the points close. This also opens up the door to go to coil pack, because now I can disconnect the coil from the disty and trigger the coil with a Fet or similar. This dramatically reduces wear on points. For bonus points I put in a timing wheel, photosensor and run individual coil packs. I can leave the mechanical/vac advance as it is if I wanted to. That's down the track but.
Also, decided to forget about alphaN tuning, too bloody "race car"ey. Going to Speed density. Temp sensors are still on the way (been about 3 weeks now

) so when they arrive Il get to trying to tune it up.

Anyway, that's about all, still on the hunt for some ea81 std pistons.....

Regards

Doug

steptoe · Post by **steptoe** » Sun Jun 09, 2013 9:40 pm

dunno if it helps trivia banks, when i stripped down an Impreza 1.6 loom I found three shielded cables. One being O2 sensor, 2nd may be fuel pump as L Series ran shielded for their efi pumps on turbo anyway. Wonder if third was from crank sensor ?

Subydoug · Post by **Subydoug** » Sun Jun 09, 2013 10:01 pm

All the cables I installed for sensors are shielded

. I Run the shielding straight to the shassy. Didn't digg too deep but I'm pretty sure the noise was from my circuit that suppressed the positive spikes. Could have probably fixed it pretty easy but eh. I like the points idea. One thing less to fail.

Regards

Doug

Tweety · Post by **Tweety** » Mon Jun 10, 2013 11:40 am

Never before have I been so captivated by a topic that totally eludes me....

steptoe · Post by **steptoe** » Mon Jun 10, 2013 4:29 pm

in a years time Tony will be taking over on efi issue advice

Tweety · Post by **Tweety** » Mon Jun 10, 2013 6:29 pm

might be right there mate.

The Bennie and Tweety SPFI kit....a must for every Brumby owner

Subydoug · Post by **Subydoug** » Mon Jun 10, 2013 8:52 pm

Its all easy stuff Tweety. The hard bit is finding the time to actually work on it

. Lately Ive Been driving the wagon around with just a turn pot inside the cab which adjusts the fuel output

. Being manual makes it pretty interesting. Getting good at steering with my knee

.

Doug

Subydoug · Post by **Subydoug** » Mon Jun 10, 2013 8:59 pm

Oh, forgot to say, got the temp sensors today. Beauty!

Regards

Doug

Subydoug · Post by **Subydoug** » Tue Jun 18, 2013 8:05 pm

Well, after a few weeks of keeping an eye out and a few pretty unhelpful websites, ive given up on new pistons. Found some new rings and im giving the old pistons a look over, just to make sure they arnt damaged, warn, cracked etc. Look ok to me so far,

Just cleaning up the rest of them now and got some new rings in the post

.

Regards

Doug

Post by **TOONGA** » Tue Jun 18, 2013 8:19 pm

Um ebay US?

http://www.ebay.com/itm/SUBARU-BRAT-82- ... 6c&vxp=mtr

0.20 oversize

TOONGA

Subydoug · Post by **Subydoug** » Tue Jun 18, 2013 8:23 pm

Yeah, I need std

Tweety · Post by **Tweety** » Tue Jun 18, 2013 8:48 pm

Could you find oversize pistons Doug? Just wondering

YouTube · Post by **El_Freddo** » Tue Jun 18, 2013 9:40 pm

Oversized pistons will be about all you'll find available aftermarket.

Those original units you've got, make sure they're still round - have a shop measure them up as they do warp. The ones that came out of my block were warped. This warpage can create issues with ring bedding and ultimately sealing performance - thus a loss of performance.

Same goes for the bores...

Hope it's all checked out ok, or will be ok!

Cheers

Bennie

Subydoug · Post by **Subydoug** » Tue Jun 18, 2013 10:39 pm

When I split the block a few months back I measured them. From memory the bore was around half a thou out of round and the pistons...cant remember. Bore still had a bit before service limit and that's why I didn't bother reboring it. I did measure them though. I cant remember If I measured out of round of the pistons. Most likely not as the plan was to replace them. Il measure them up next time im in the shop. If they're out then Il just get the bore rebored

.

Tweety, Never really asked. Struggled to find any pistons, even ea82 which from what I read will fit. Most likely out there.

Oh, and Toonga, just because its listed on ebay, doesn't mean the seller has it

.

Regards

Doug

Subydoug · Post by **Subydoug** » Wed Jun 19, 2013 12:06 pm

For those of you who like there analog circuitry,

Regards

Doug

Tweety · Post by **Tweety** » Wed Jun 19, 2013 1:23 pm

Major engine rebuild kits for ea81 and ea82SPFI

http://rpmmachine.com/engine-rebuild-kits-subaru.shtml

Subydoug · Post by **Subydoug** » Wed Jun 19, 2013 2:30 pm

Yeah. There are a few combo's like that around. No one wants to split out some pistons though

.

Subydoug · Post by **Subydoug** » Wed Jun 19, 2013 7:48 pm

Just a side note, put the weber back on after work today for a weekend of fun

and engine response is deffinately slower then the efi/throttle body setup. Maybe around 30% id say.

Regards

Doug

Post by **TOONGA** » Wed Jun 19, 2013 8:58 pm

Subydoug wrote:For those of you who like there analog circuitry,

Regards

Doug

The link showed up in the quote Doug (when I wrote this) but I can't connect to it

TOONGA