WRX RCY

Hi all,

I looking for information peeps. Did the Impreza V1 STi have a 2.0 Closed Deck Block in it?

And can a 2.0 Closed Deck Block be tranformed into a 2.2 or 2.3 lump?

I know I spoke to Bigbrake last Saturday about the closed deck block, but forgot what you said , sorry.

This is going to be my long, long, long term project

MrRA

Not 100% sure but I think they did run a closed deck block.

Pretty sure they can be bored out to a 2.2 as well.

Good luck with whatever your planning

Silver Scooby Sport

iTrader: (15)

Might be time for you to have a little look around on HERE Chris

turboDean

iTrader: (4)

Conrad Bradley is selling all the bits to make a 2.33 short motor in the general for sale section, he is including a 2.0 closed deck block in the package, so yes they can be made into a 2.33.
Apparantly cost about £1000-£1500 to get the block bored, lined and built up:

https://www.scoobynet.com/private-sa...arts-sale.html

SW Sport Pilot

what sort of project mate?

bluerigster

iTrader: (9)

Hi Chris
Your car would of most likely come with one but it's easy to find out as the block have cross hatching around the oil filter this is also found on the heads as for bore scoop, your able to rebore right up a 2.5L but most people opt for a 2.33 litre with a 2.5L crank. This retains it's piston liner thickness which benfits when boost pressure is raised as the thicker the piston liners the more temperature there able to cope with before going pop.

matscooby

iTrader: (3)

I thought the V2 only had the closed deck block, I could be wrong though.

WRX RCY

Checked for the tell tale signs but couldn't find the cross hatching. And I've purchased a closed deck block off ebay

So, the next stage is the internals

bluerigster

iTrader: (9)

Wiesco pistons all the way.

WRX RCY

Why?

What the best material/manufacture to us for the rods?

bluerigster

iTrader: (9)

Weisco are on a level with regards to quality with say Hks or Jun but the they cost alot less due to being manufactured in the USA. Great deals with regards to purchasing direct from USA. The manufacturing process Weisco use produces the lowest weighted piston in its class which all helps with inertia and friction reducing wear. As for there quenching facility its amazing (sorry I get excited by all forms of engineering) it's the speed in which they quench the aluminium which accounts for it's hardness it also up to aerospace standard. I know Zen uses these pistons and found them very reliable, I'm currently looking a purchasing once 2.5L technology has improved I know Cosworth are making good ground with regards to reliablity. As for rods Pauters and Crower steel conrods seemed to be well used throughout the pro class dragging field. As for bolts, ARP bolts are most commonly used.

WRX RCY

Fair play

WRX RCY

Block arrive this morning .

Another question for the fuel burners . What type of power and top speed can a 94 ra gearbox handle?

bluerigster

iTrader: (9)

120mph top speed and 320 Ib/ft of torque.

WRX RCY

Well thats not that good

turboDean

iTrader: (4)

For your 2.33 plan (guesing your aiming well over 350lb/ft toruque) your gonna need either a PAR/PPG 5 speed box or a 6 speed out of a newage STI. Either one is probably going to cost over £2K, unless your lucky enough to find a second hand PAR/PPG like Bigbrakes.

WRX RCY

Would a 6 speed cope with 450lb/ft?

MrRA

Yes

turboDean

iTrader: (4)

As MrRA said yes they will, but from what i've read a 5 speed PAR/PPG is better, as it is lighter and the longer ratio's suit the bigger engine capacity better. But i think the Gearset is £2200 plus the build cost on top.

bluerigster

iTrader: (9)

I agree with Dean the 6 speed is 35kilos heavier and with shorter gear ratios meaning you will be in between gears all the time. What sort use for the car do you have in mind?, as if it's going to be used mainly as a road car the straight cut gears will drive you mad. I know PPG make helical gearsets which are capable of handling 450lb/ft of torque which would be road use friendly. Your going to be looking the best part of 3 grand built and fitted. One expensive project you have got on your hands!.

WRX RCY

I have an easier one for you. What size bolt are used to bolt the gearbox to the engine block? And are all the bolts in metric or imperial?

turboDean

iTrader: (4)

easy haven't got a clue on that one.


Bluerigster - What gearbox r u using/going to use? as i'm guessing your soon going to have over 400lb/ft of torque.
This is what has stopped me going for a 2.5 build sooner coz i can't afford the £2500-£3000 for a PPG box on top of the new engine and turbo. My preference would be PPG Helical Cut gears at standard UK ratios with Syncro engagement.
There was a gearbox with Helial cut gears in the FOR SALE section last week for £1600 with something like 2000 miles on it, but it was a DOG box, probably not the best for road use.

MrRA

Going to be metric for definate. No way Japs would use imperial now is there

6 speed unit is heavier but IMO more ratios will allow to better spread the engine speed. It also stiffer than a 5 speed unit. Why not try and get one with the JDM 5th and 6th ratios in or go for a different final drive???

If your going to be building a big power engine then your gonna be eating gears no matter what ratios you have.

bluerigster

iTrader: (9)

Using a STi V4 box at the moment (original RA box bit the dust) only been in the car for last 8k, starting to show signs of wear as grinding when in reverse.
I'm hopefull it will hold out until march next year as should have enough money for a box rebuild with helical cut PPG Syncro gear engagement and Quaife diff mostly probably carried out by ZEN performane. Then remap time with Andy Forrest ready for Santa Pod.

Weight is a key factor, I'm trying to keep the car as light as possible so I don't have to run too higher power.

turboDean

iTrader: (4)

Gorup Buy on PPG Gearsets then?

ScuuBdoo

Subaru Block

WRX RCY

I have a 95 wrx jdm. And I'm presuming I have hydraulic tappets.

But the questions are:

Whats the difference between hydraulic and solid tappets?

Which is the best tappets?

Can solid tappets be fitted in a hydraulic tappets heads?

bluerigster

iTrader: (9)

Only the type RA's came with solid lifters along with a closed deck block as standard and where chosen originally for there strength as able to cope with large amounts of power. The downside of solid lifters is there difficult to set up in comparison to hydraulic tappets. If however you where to want a large valve conversion along with some high lift cams I would go for solid lifters, this would create a high reving high flow cylinder head which would be extremly strong. But a cheaper option is to choose V3 or V4 STi heads as Subaru made a perfectly good cylinder head in it's STi V3 which benifited with higher profile cams in comparison to type RA cams but these came with hydraulic tappets which rely on good oil supply at all times (oil surge/starvation when cornering). Both the later cylinder heads are less prone to cracking so used commonly with large powered Subarus.

Type RA's also came with a 5th injector located on top of the inlet maniold which some rally cars have converted for water injection to reduce engine temperature and improve MPG as mapping requires the engine to run less rich.

bluerigster

iTrader: (9)

As I've chosen to use a UK spec six speed gearbox in my car. Has anyone pictures of the oil cooler fitted to the JDM spec C or know of one for sale?. Any info would be great.

MrRA

That's going to be a rare item to find second hand IMO.

You may have to bite the bullet and purchase a brand new one.

I have seen photos on here posted by STI8U I think of his Spec C Type RA with the front bumper removed and it showed the oil cooler in situ. It is located on the offside of the car, near the fog lamp cover IIRC.