engine internals

[impreza]

i have a 94 wrx with omega 50 oversize pistons as far as i know the rest of the engine internals are standard upto what bhp will the engine be reliable

[allsop83]

I'd say only really up to 280/300bhp....the crank will probably be your weakpoint if it is the OE item.

[japgt]

why the crank??, bearings maybe, but not the crank, do you know what block it is?? open, semi or closed deck?? its really difficult to tell without a bit more info on what you have. open is the weakest block, closed being the strongest, these have been found in certain wrx variants, but usually only sti's. try and find some more info and take it from there.

[ScoobieWRX]

It would be unusual and totally pointless that someone going to the trouble of fitting oversize Omega pistons wouldn't also go to the trouble of doing something about the wristpins, rods and bearings at least, and more than likely fit better head bolts and gaskets as well. It's very common just to use the original crank as Subaru cranks are pretty reliable, and would normally just get a polish to take out surface imperfections, specially around the journals.

If the crank is that bad that it needs to be re-ground you would just throw it away and get a new one at which point you'd get a stronger/lighter crank upgrade.

The block itself would also require a rebore for starters and that's major work and expense, so fitting just forged pistons would be a complete waste of time.

More info on the block, as has been said, would be very useful, and i would hope that more than just the pistons have been done.

[Vixpy1]

The crank is the strongest part of a subaru engine, its really really rare that they fail.

[allsop83]

I've maybe got it the wrong way around then!! Haha

If you look in the engine bay mate and let us know the FULL engine code we will be able to tell us what engine block you have

[impreza]

Hi the engine number is ej20gdw2he

[ScoobieWRX]

In which case it's an STi so i presume it's a closed deck block (CDB).

In all likelyhood the build may well have been done properly, if you have a CDB you do a proper job!!

Although we still can't be certain the internals should be good for at least 400+, perhaps more.

[impreza]

hang on its a L reg they didnt do an sti until 96 or so i thought

Edited by impreza on Monday 20th September 23:32

[ScoobieWRX]

That engine code is for an STi. Go and check it for yourself.

[impreza]

im sorry i worded the last post wrong i was thinking it must be a L reg sti or its got a transplant engine from a sti im pretty sure they didnt do an sti until 96 prehaps im wrong on this thank you for checking the engine number

Edited by impreza on Tuesday 21st September 00:45

Edited by impreza on Tuesday 21st September 00:48

[GravelBen]

96 Sti was a Ver.2 so they did one before that - whether it was 94 or 95 I don't know.

[ScoobieWRX]

The earlier V1 STi's were a WRX production car factory modified to STi with that engine code so actually they called them a WRX(STi). It was the 96 V2 that became an STi proper in it's own right.

[allsop83]

I don't think that is a CDB mate but even so, you will be restricted to a certain power level by your gearbox which I'm thinking will only realistically cope with 320 with similar torque? Meaning your ODB is more than capable unless you are upgrading your transmission.

Have a look through here for detail on engine codes: http://www.catherineandken.co.uk/sti/wrx.html

[ScoobieWRX]

I've copied this from ScoobyNet from a post where someone has replied to a thread that has this engine in their classic.

---

VIN: GC8-018688
applied model: GC8B48D
option code: BJ
trim code: 420
engine type: EJ20GDW2HE
color code: 406 (silver of sorts)
transmission type: TY752VB3CA

1. Series code G = Impreza S = Forester B = Legacy etc.

2. Body type F = Wagon C = Sedan

3. Engine type 8 = 2.0L Turbo

4. Year code A = MY93 B = MY94 C = MY95 & 96 D = MY97 (facelift) E = MY98 F = MY99 G = MY00

5. Number of doors 2 = 2 door coupe 4 = 4 door saloon 5 = 5 door wagon/hatch

6. Model type 7 = RA 8 = WRX type E = STi D = STi Type R & RA S = 22B

7. Transmission D = 5 Speed Manual AWD P = 4 Speed Automatic AWD



EJ20 1,994cc four cylinder horizontally opposed at an angle of 52deg, mounted longitudinally at the front, aluminum head and block, IHI turbocharger and air-to-air intercooler, oil cooler.

Bore/stroke: 92/75mm Compression ratio: 8.5:1 Valves: Four per cylinder, double overhead camshafts on each bank.

Ignition: Electronic Induction: Multipoint fuel injection Power output: 250PS @ 6,500 Torque: 309Nm (22lb ft) @ 3,500 Specific output: 125PS per litre Power to weight ratio: 203PS per tonne

Transmission: Permanent four wheel drive, front differential, center viscous coupling, rear viscous coupling.

Gearbox: Five speed close ratio manual Gearbox ratios/ Mph per 1000 rpm 1st 3.17/5.1 2nd 1.89/8.6 3rd 1.30/12.4 4th 0.97/16.6 5th 0.74/21.8 Final drive: 4.444:1

Brakes (front): Ventilated Brakes (rear): Ventilated ABS: Late STI only

Suspension (front): McPhersons struts, coil springs, transverse link, anti roll bar. Suspension (rear): McPhersons struts, coil springs, transverse link, trailing arms, anti-roll bar.

Steering: Rack-and-pinion, power assisted. Turns lock-to-lock: 2.8 Wheels: 6x15-inch alloy Tyres: 205/55 R15 Weight: 1,230Kg (saloon) 1,300Kg (sports wagon) Weight distribution: 54 per cent front, 46 per cent rear

Wheelbase: 2,520mm Length: 4,340mm Width: 1,690mm Height: 1,405mm Front track: 1.460mm Rear track: 1,455mm Boot volume (VDA): 353 litres (seat do not fold)

Fuel tank: 60 litres Each engine was blueprinted (manufactured and assembled to higher tolerances) and added closed deck cylinder block finished in red crackle finish (V2 onwards - V1 is good old silver), forged pistons, steel crankshaft, bigger valves, better intercooler, bigger radiator, reset ECU and uprated turbocharger.

Fujitsubo part stainless steel exhaust with wider bore, sodium filled manifold, free flow larger diameter silencer and a three inch chromed tailpipe embossed with STI logo.

Gearbox was close ratio with quickshift. Stronger front and rear differentials with heavy duty drive shafts. Genuine 150mph car with 0-60 time of 4.6secs, and an excellent 50-70mph time of less than 3 seconds - great for overtaking everyone!

Suspension was die cast aluminium lower front wishbones which reduce weight. Carbon fibre strut brace, stiffened Sti springs and dampers.

Bodywork had aluminium boot and bonnet to reduce weight. The car was full AC climate control, electric folding mirrors and full electric windows.

Inside the car had rally style seats with coloured inserts sporting the STI logo. Early editions kept the front spotlights and an STI logo on the front spoiler.

They also had split rims alloys and the legendary pink and aluminium front strut brace. Larger rear spoiler, higher than most of the later STI's. Later editions had blank plates where the spotlights are (no lights behind them though), gold alloys and much sought after clear indicator rear lenses.

[allsop83]

Hmmmm, not convinced- I can remember seeing somebody on Scoobynet at one point trying to say their UK RB5 had a CDB so I wouldn't take it as gospel.

Take a look at that link I posted and try to make your own sense of it- I managed to take this from it but I might have missed cross-referencing some?:

Models that came with closed deck block + engine code are:

WRX A/B; EJ20GDW1HD (no A/C), EJ20GDW1HE (with A/C)
STI Ver. I; EJ20GDW1HD (no A/C), EJ20GDW1HE (with A/C)
WRX A Type RA; EJ20GDW1HJ (no A/C), EJ20GDW1HR (with A/C)
WRX B Type RA; EJ20GDW2HJ
WRX C Type RA; EJ20GDW4HJ
WRX STi Ver. II Type RA ; EJ20GDW5PE

let me know if you make anything of it I have missed- would be good to know for my own reference

[Tidgy]

about 350bhp/350ftlb to be on limit of engine and gearbox.

gearbox will tend to let go before engine though, mine blew at 280ftlb, been running 340/315 for about 3 years now no probs, but on a ppg straight cut box. uk turbo car which is comparable to wrx

[japgt]

the original sti was 94 onwards, i have one sitting in my garage.