EA82 piston top carby, pic
- steptoe
- Master Member
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EA82 piston top carby, pic
this turned into useless info. Links in posts below don't work anymore
Just in case photos (to be added) disappear in the future.
OK, 1989 NA mpfi EA82 slugs below
here is a description of a piston found in an mpfi EA82 NA 1989 casting date on block
imagine a flat top piston, now see arrows indicating towards front of engine block, and other markings indicating R or L, R are fitted to block same side as a driver sits in RHD worlds.
Next pic, below is from hmmm, EA82 Turbo mpfi, piston tops a few thou above the deck, and according to the previous, previous owner was a strong EA82T until it blew a hose - Fury Leyland Vortex, with a single wire knock sensor in it
You still got image of flat tops in head ? Well there is a recess in piston top, it is not equal as it is deeper on the lower side of what look like a pair of cuircular depressions for valve clearance, ramping up to the flat top of the piston.
Word is if you use EA82 NA mpfi pistons you get higher compression than that of carb or turbo pistons.
What I have trouble conceptualising is if we have three different piston designs - how are all of them same cc's ?
EA82 mpfi TURBO pistons, running 7.7:1 comp ratio in 85.86 models have flat top with an even depth recess in the centre
Just in case photos (to be added) disappear in the future.
OK, 1989 NA mpfi EA82 slugs below
here is a description of a piston found in an mpfi EA82 NA 1989 casting date on block
imagine a flat top piston, now see arrows indicating towards front of engine block, and other markings indicating R or L, R are fitted to block same side as a driver sits in RHD worlds.
Next pic, below is from hmmm, EA82 Turbo mpfi, piston tops a few thou above the deck, and according to the previous, previous owner was a strong EA82T until it blew a hose - Fury Leyland Vortex, with a single wire knock sensor in it
You still got image of flat tops in head ? Well there is a recess in piston top, it is not equal as it is deeper on the lower side of what look like a pair of cuircular depressions for valve clearance, ramping up to the flat top of the piston.
Word is if you use EA82 NA mpfi pistons you get higher compression than that of carb or turbo pistons.
What I have trouble conceptualising is if we have three different piston designs - how are all of them same cc's ?
EA82 mpfi TURBO pistons, running 7.7:1 comp ratio in 85.86 models have flat top with an even depth recess in the centre
- discopotato03
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- Location: Sydney
There are pics if you search under EA82 NA pistons , not sure if these are carb or SPFI .
This was one I found
http://homepage.mac.com/dgiessel/.Pictu ... 240020.JPG
Cheers A .
This was one I found
http://homepage.mac.com/dgiessel/.Pictu ... 240020.JPG
Cheers A .
- steptoe
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look the same to me, including the arrow marking
I think the purpose of this post was to show pic of the piston tops to continue a discussion re EA82 pistons of 8.5:1 and 8.7:1 comp ratio - there appears to be listings of both ratios for EA82. I have factory manual that lists 8.7:1 as the carby comp ratio yet others have mentioned 8.5:1 as another comp ratio
Adrian, you got 87 88 manuals? what is the comp ratio for the EA82 carb?
I think the purpose of this post was to show pic of the piston tops to continue a discussion re EA82 pistons of 8.5:1 and 8.7:1 comp ratio - there appears to be listings of both ratios for EA82. I have factory manual that lists 8.7:1 as the carby comp ratio yet others have mentioned 8.5:1 as another comp ratio
Adrian, you got 87 88 manuals? what is the comp ratio for the EA82 carb?
- Gannon
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- Location: Bowraville, Mid Nth Coast, NSW
Jonno, your photo didnt work.
So here it is
Disco.... looks like that piston would be nearly 10:1 comp just from the carbon build up
I'll grab my 88 turbo pistons for some comparisons next time im at dad's.
So here it is
Disco.... looks like that piston would be nearly 10:1 comp just from the carbon build up
I'll grab my 88 turbo pistons for some comparisons next time im at dad's.
Current rides: 2016 Mitsubishi Triton GLS & 2004 Forester X
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
------------------------------------------
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
------------------------------------------
- Gannon
- Senior Member
- Posts: 4580
- Joined: Sat Nov 05, 2005 10:00 am
- Location: Bowraville, Mid Nth Coast, NSW
Was there only one picture?
The trick is to get the image information, (by right clicking on the image and selecting 'properties' and copying the image address
http://img514.imageshack.us/img514/231/dsc00764o.jpg
then put [img]and[/img] either side of the above link
The trick is to get the image information, (by right clicking on the image and selecting 'properties' and copying the image address
http://img514.imageshack.us/img514/231/dsc00764o.jpg
then put [img]and[/img] either side of the above link
Current rides: 2016 Mitsubishi Triton GLS & 2004 Forester X
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
------------------------------------------
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
------------------------------------------
- discopotato03
- Senior Member
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- Joined: Sun Mar 18, 2007 9:29 am
- Location: Sydney
- steptoe
- Master Member
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- Joined: Thu Oct 06, 2005 10:00 am
- Location: 14 miles outside Gotham City
Five years later, and I am looking at pistons again.
Pics to follow, and will got to first post.
Revisiting an NA mpfi block I got to drive, pulled well, but may have turned air cooled on the drive home - no idea of where coolant went - next day, all it wanted to do was die, so rather than diagnose it, I dissembled for parts. Today I find the rear PCV baffle outlet pipe is jammed packed with brown and black carbon. Poor thing !
Thinking to do something never done before - pinch used pistons and rings and shove in another engine - EA81. Or just clean it up, reassemble and fit somewhere to compare carb pistons to efi pistons.
If you have pics of known EA82 pistons tops carby, mpfi, turbo etc , please feel free to update. I think spfi got mpfi pistons in USDM
Pics to follow, and will got to first post.
Revisiting an NA mpfi block I got to drive, pulled well, but may have turned air cooled on the drive home - no idea of where coolant went - next day, all it wanted to do was die, so rather than diagnose it, I dissembled for parts. Today I find the rear PCV baffle outlet pipe is jammed packed with brown and black carbon. Poor thing !
Thinking to do something never done before - pinch used pistons and rings and shove in another engine - EA81. Or just clean it up, reassemble and fit somewhere to compare carb pistons to efi pistons.
If you have pics of known EA82 pistons tops carby, mpfi, turbo etc , please feel free to update. I think spfi got mpfi pistons in USDM
- Willy Fisterbottom
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- Location: NSW
- steptoe
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- Joined: Thu Oct 06, 2005 10:00 am
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waiting for someone else to do that
I have enough crap to play with, without spending
reckon the twin port inlets, centre inlet valves of the EA82 (same arrangement as EA81S) is a pretty good platform to play with. Leaves the slugs and rings where I found them. Test driven too, was quiet and didn't blow too much steam
I found a pic on usmb for the carby slug, has a combo of two different shape decompression divots. Absolutely no idea what is in my current EA82 plaything other than known carb block made in late 86
I have enough crap to play with, without spending
reckon the twin port inlets, centre inlet valves of the EA82 (same arrangement as EA81S) is a pretty good platform to play with. Leaves the slugs and rings where I found them. Test driven too, was quiet and didn't blow too much steam
I found a pic on usmb for the carby slug, has a combo of two different shape decompression divots. Absolutely no idea what is in my current EA82 plaything other than known carb block made in late 86
- steptoe
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- Joined: Thu Oct 06, 2005 10:00 am
- Location: 14 miles outside Gotham City
Helps confuse me - they look like the mpfi NA pistons in pic at top of thread. Thanks (for confusing me and others now )
Next measure taken is gudgeon pin to top of piston. Maybe our carby EA82 got higher comp than the US ?
I am thinking the US style carb slugs with their two different decompression shapes would have rung a bell with me when I saw them on usmb post, your carb and my mpfi pistosdo look familiar....
Next measure taken is gudgeon pin to top of piston. Maybe our carby EA82 got higher comp than the US ?
I am thinking the US style carb slugs with their two different decompression shapes would have rung a bell with me when I saw them on usmb post, your carb and my mpfi pistosdo look familiar....
Hey steptoe there are no optical illusions or trickery with my pics or slugs, The block was inverted when I took the pics for cleaning purposes:o To my knowledge the second owners changed the block (therefore engine # from original) due to overheating or whatever but all the extra "spares" supplied with the car at the time point to a carby EA82 donor block. This carby block stills goes really well, so if the comp ratio works for your purposes then go for it I say!!
BTW those bores may look too shiny in my pics but were actually in really good nick, plenty of x hatching still visible.
J.
BTW those bores may look too shiny in my pics but were actually in really good nick, plenty of x hatching still visible.
J.
- steptoe
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aha, the giveaway then would be that block with those pistons and shiny looking bore would not have the fuelie PCV breather pipe at the back, nor the baffle plate visible behind the flywheel then ?
There has been enough discussion that differing years got differing comps, maybe differed between markets as well. A guy on usmb reckons the EJ 20 pistons mak for nice EA engine builds - partly for round oil return holes instead of slots behind oil rings, maybe also their flat tops ?
There has been enough discussion that differing years got differing comps, maybe differed between markets as well. A guy on usmb reckons the EJ 20 pistons mak for nice EA engine builds - partly for round oil return holes instead of slots behind oil rings, maybe also their flat tops ?
- steptoe
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and could revive this discussion while Jay is on air - just try find NA EJ20 pistons on ebay or google for that matter, let alone OS ! Looking at EA71 specific not multi EA fit pistons for an MPFI block at the moment
EDIT : whoops, he's gone again, not wanting to be reminded of his beautiful build EA82 stopping being a nice engine - still to explain, or maybe I forgat ?
EDIT : whoops, he's gone again, not wanting to be reminded of his beautiful build EA82 stopping being a nice engine - still to explain, or maybe I forgat ?