2.6L Astron Engine Differences

[DragonCypher]

I know this was (partly) covered on the old site but I think it should be collaborated together into ALL the noticable differences and then stickied or something like that..

I'll start with a little bit but I'm hoping we can build it up quickly enough, and please correct anything I got wrong..

Astron 1:
1979-1984 (? please clarify)
Solid tappets
Compression Ratio 7.9:1 (?)
Specific inlet bolt pattern for Astr1
More basic style rocker cover
Manual - Wideblock
Auto - Narrowblock - same bolt pattern as 2L 4g52 auto & manual, maybe others?
Waterpump on front of the block
Thermostat housing at the front of the inlet manifold
Oil pump different to all Astron 2's

Astron 2:
All manual NON-magnas are wideblock
Auto + magna = narrowblock

And all non-magnas are solid tappets.


Magna 1985-1991:
Hydraulic lifters
Compression 8.8:1
Mechanical fuel pump *Astron Boy
'85-'86 only used leaded fuel
Single 2-ventury downdraft mikuni carb
# 85 kW (114 hp) at 5000 rpm (91 RON) (wiki)
# 195* nm (144 lb-ft) at 3000 rpm (91 RON) (wiki) *Astron Boy
Always narrowblock, whether auto or manual
Distributor sits angled toward inlet manifold (fouls on thermostat housing from rwd manifolds)
Waterpump relocated to the back of the head and same with thermostat housing (due to being front wheel drive)

1987-91 Magna also available in ECI Multi
# 93* kW (127 HP) *Astron Boy
# 205* nM (151 lb-ft) *Astron Boy
Electric fuel pump *Astron Boy
Yellow top injectors *Astron Boy
Later style rocker cover
Later inlet bolt pattern


Magna 1992-1996:
'92-94 - Hydraulic lifters *Astron Boy
'94-96 - Roller rockers *Astron Boy
'94-96 - Kidney shaped head dome *Astron Boy
Compression 9.2:1
Electronic Fuel Injection (again with thermostat housing at the back)
Electronic fuel pump
Blue top injectors *Astron Boy
# 98 kW (131 hp) at 4750 rpm (91 RON)
# 102 kW (138 hp) at 4750 rpm (95 RON)
# 212 nm (156 lb-ft) at 3750 rpm (91 RON)
# 220 nm (162 lb-ft) at 4000 rpm (95 RON) (from wiki)
Rocker cover, inlet bolt pattern and waterpump all the same as earlier magna
Distributor also angled like early magnas

Triton Astron 2
1990 - M16 head *Stealth
4wd wideblock

Starion G54BT Turbocharged 2.6
Exclusive to the United States, all other country variations were 2.0L Turbo and Japan offered an unpopular N/A variant
TD05-12A turbocharger
Fuel injection (Single point injection or TBI, same as Cordia)
Intercooler is found only on the latest model to come out in the States: ESI-R (Conquest TSi)

Ford courier 2.6 IS a Mazda B2600 in its entirety, built by Mazda and just re-badged.

The Mazda B2600 originally used a complete Astron 2 engine, presumably identical to a Triton or L200 ute.
The 2nd series of B2600 with the extra valves and such is a completely new engine called the Mazda G6 at 2606cc displacement.
No parts are interchangeable between these.

Info on the Astron 2 versions of Sigma, Triton, Pajero, L200 and L300 would be great


Cheers,
Chris

[Astron Boy]

Mazda 12V do not in any work bolt up to our engines.
They are completely different, water and oil channels.

The Astron 2 87-91 Magna Also has a EFI config
Same comp ratio, but power is rated at 93kws with torque 205nM
Torque on the carby version as per owners manual is actually 195nM

[DragonCypher]

Cheers for that, numbers have been updated accordingly and I will be placing references next to each update with the member who suggested it.

I also did some research on the ford and mazda 2.6's.. info updated at the bottom of the post

-
Chris

[Astron Boy]

Dunno if you're interested in nitty gritty particulars, but the Magnas 85-91 also had a variant from a mechanical fuel pump 85-86 to an electric from 87-96.
Mainly for easier production with the intro of the EFI model.
But also 85-86 was leaded petrol model head (different valves)

Don't forget also you have Starion G54b turbo model!

[DragonCypher]

Doesn't bother me if its nitty gritty

The whole idea is to collaborate all the information we can possibly gather for all 2.6L astrons ever made and sticky it

That way noone will need to ask for info about factory configurations.

If it needs to go as far as listing mitsubishi genuine part numbers and camshaft profiles etc then so be it. Just as long as the info is correct it'll go in there

[stealth]

mate i just wrecked a tn magna 88 model with electric fuel pump
and astron 2 has different oil pump to astron 1
also have a triton engine here 1990 has a m16 head
and the dizzy are different all the way througjt the years
how tecnical are we getting
cheers stealth

[Astron Boy]

In saying that you also reminded me
TS Magna, 94-96? Had kidney bean shaped head domes for the pistons.
92-94 has hydraulic tappets, the 94-96 had roller rockers.
Also yellow top injectors were replaced from the EFI setup after 92 with blue top injectors.

[DragonCypher]

mate i just wrecked a tn magna 88 model with electric fuel pump
and astron 2 has different oil pump to astron 1
also have a triton engine here 1990 has a m16 head
and the dizzy are different all the way througjt the years
how tecnical are we getting
cheers stealth

As long as I can add it to the list you can be as technical as you want

But in terms of having different dizzy's all through I'd need a list of whats actually different so that I can include it

[DragonCypher]

*deleted*

[Astron Boy]

Starion had same fuel system as Cordia, single point injection, or TBI.
Popular mod is Magna plenum which they dont have over there at all. (I used to export them)

by the way, Electric fuel pump for carby was done from 87-92

[stealth]

i wont go into dizzys as i dont know what came from where
but i have seen
points type
electronic with external control
and high energy like gk sigma and tn magna
as for the kidney shaped head thats a m8
and triton 1990 block is a wide block 4wd manual g/box
dont know if that helps
good work
cheers stealth

[Astron Boy]

LOL, if you want to go into Dizzy and MAFs I can give you those for the Magna, there is about 3 different orientations.
Also, I am unsure on spec, but A2 intakes for EFI also did change when the Gen1 died.

[81GL]

This is going to get to be a very confusing thread There are so many variables with our beloved cars...

as for the kidney shaped head thats a m8

Not neccesarily true Stealth... The M8 in my galant is hemi, not kidney. Although a lot say they have a Kidney M8 ? year model maybe?
-Was a thread on this on the old site if anyone is really wanting to know.

Nick.

[Sigmaproject]

-
Hate to spoil the party but the Sigma Astron II in manual form is a WIDE block. I have one fitted to my wagon straight from the factory. ;)

Auto's are narrow and there are no 2 litre Astron II's
-

[81GL]

Auto's are narrow and there are no 2 litre Astron II's

From factory

Hmm... didn't the sigma astron 2's (and scorp...) run solid tappets too from memory?

[Astron Boy]

Correct, Magnas were the first Astron 2 with hydraulic tappets.
All Astron 1 and Astron 2 variants were solid oherwise.

I have heard of a few l200/ l300 with hydraulics though.

[DragonCypher]

Oh dear god why did I start this


[edit]: and why is there a post from me quoting me and nothing more? i didn't do that

[Sigmaproject]

--

Why indead

ALL Australian built Sigma Astron II's have hydraulic tappets.
___________________________________________________


The Scorps were imported and had adjustable tappets, as did the Starions sold in the US.

This is FROM THE FACTORY. What people have done with them in the last 25 years is anyones guess.

[Astron Boy]

Ahh, I was basing my fact from the starions and scoprs.
never come across an astron 2 sigma myself.

lol, yeesh This is gonna be an interesting thread to watch develop.

[Paddles]

My triton is an 88 model with original motor in it, that has hydraulic lifters but every astron 2 sigma i have wrecked or the scorps i have collected have been tappets.

Paddles

[Astron Boy]

Yeah, I swore I read that the Magna was the first to get the hydraulics.
A few of the l200-l300 later on received the hydraulics, but as the Sigma faded out just before the Magna came in, they still had solids!?

[Sigmaproject]

The Sigma Astron II was completely different Australian made motor to the Imported Astron II's.



The GN and the first Magna where both built in 85, so why the fk would they put hydraulic in one and solid in the other.

You can argue all you like but the facts are that ALL AUSTRALIA produced Astron II, whether Sigma or Magna had hydraulic lifters.

(And the fact that I have converted mine over to solids ,doesnt mean that they all came with solids
And a mate has TR head and roller cam on his GJ and that doesnt mean that all GJ Sigma came with TR heads and roller cams :roll:0

[Astron Boy]

I don't see any arguing, only people trying to get all the facts.
Chill

[Sigmaproject]

These books dont lie

[stealth]

astron 1 and astron 2 have differt sump bolt patterns
cheers stealth

[Sigmaproject]

Not only that, the Australian Astron II was narrower all the way from the sump to the head.

The Astron had removable balance shaft covers and the Astron II (Australian Made) didnt.

The Astron oil pressure switch was at the front/ side of the block and the rear/ side on AstronII (Australian made)

Now all of these changes were obviously for the FWD Magna's, but they are also on ALL Sigma Astron II's

Bit of a mystery why they cast a wide block for the GN, having such a short production run 85-87. Only logical reasson is to retain the big flywheel

[DragonCypher]

What if I just said we have enough info already and stopped

seriously with the amount of stuff in the last few posts it'd crowd up the info to a point where its just as confusing as its always been

[Sigmaproject]

It is not confusing at all. The facts are facts. ;)

[Astron Boy]

Personally I think the easier thing would be to split it up per vehicle.
That way there is far less confusion.
But there can also be a downside doing it that way.

I haven't yet uploaded the info back onto my forum, but we had all the engine number variants, transmission, everything, slowly loading it up to the new forum, can post up a hot link within this thread if people want to delve further.

Alot of that information was for 4G52/ 4G54 II, and nothing in between though.

[stealth]

i hope your not giving up !
this is the point of this place isnt it ?
there are that many variants but any facts are good?
might take a while and a few goes but stick with it
cheers stealth