How much to forge an engine?
Discussion
Ok so as a few of you will know my bug has had progressively worse piston slap and its at the point where its going to go in to Eurospec for an extended stay so the engine can be rebuilt.
My question is - on top of the cost of a rebuild how much would it be to forge it while its out?
Also heard about sticking the bottom end of the 2.5 engine on too. What would the benefits be?
All stuff i'm going to discuss with Ben and Mark anyway but wondered what the experts on here thought/had opinions on.
Cheers guys.
Dave.
My question is - on top of the cost of a rebuild how much would it be to forge it while its out?
Also heard about sticking the bottom end of the 2.5 engine on too. What would the benefits be?
All stuff i'm going to discuss with Ben and Mark anyway but wondered what the experts on here thought/had opinions on.
Cheers guys.
Dave.
2.5 bottom end means more torque with the standard turbo and injectors. Going forged means you'll spend a lot more and there's no point unless you're going for a big build.
A forged bottom end rebuild will be £5K-7K+. You'll want to start with a semi-closed 2.5 deck and go from there with V9 crank, forged rods and pistons.
This is the time when you should be thinking about a forged bottom end if you're going to be keeping the car long term and have plans for it. Otherwise stick to a bog standard bottom end rebuild which you can get done for less than £2K.
You could just buy a 2.5 STi bottom end in good condition/low mileage for less than £1K, buy a set of full heads 2nd hand and DIY put it together...
Just some ideas....
http://www.ebay.co.uk/itm/Subaru-Impreza-STI-2-5-S...
http://www.ebay.co.uk/itm/SUBARU-IMPREZA-2007-STI-...
http://www.ebay.co.uk/itm/SUBARU-IMPREZA-STI-RB320...
(ask for the ECU and cabin/engine wiring loom with this one)
A forged bottom end rebuild will be £5K-7K+. You'll want to start with a semi-closed 2.5 deck and go from there with V9 crank, forged rods and pistons.
This is the time when you should be thinking about a forged bottom end if you're going to be keeping the car long term and have plans for it. Otherwise stick to a bog standard bottom end rebuild which you can get done for less than £2K.
You could just buy a 2.5 STi bottom end in good condition/low mileage for less than £1K, buy a set of full heads 2nd hand and DIY put it together...
Just some ideas....
http://www.ebay.co.uk/itm/Subaru-Impreza-STI-2-5-S...
http://www.ebay.co.uk/itm/SUBARU-IMPREZA-2007-STI-...
http://www.ebay.co.uk/itm/SUBARU-IMPREZA-STI-RB320...
(ask for the ECU and cabin/engine wiring loom with this one)
Edited by ScoobieWRX on Sunday 26th August 21:07
Cheers scoobie.
Well, 5-7k is out of the question on this car.
I have been looking for different ways to go and found that there are huge amounts of 2.5 short blocks floating around - mostly in the U.S. e.g.
http://parts.subaru.com/catalogsearch/index.cfm?pa...
I expect subaru uk wouldn't be as competitively priced.
I think a 2.5 bottom end is a direction i would take with a bit more research. Not finding many sets of heads for sale.
Well, 5-7k is out of the question on this car.
I have been looking for different ways to go and found that there are huge amounts of 2.5 short blocks floating around - mostly in the U.S. e.g.
http://parts.subaru.com/catalogsearch/index.cfm?pa...
I expect subaru uk wouldn't be as competitively priced.
I think a 2.5 bottom end is a direction i would take with a bit more research. Not finding many sets of heads for sale.
Have a look in the Classifieds section of PH under Parts and Accessories, subaru sub-section with keywords 2.5 and you will see a bunch of 2.5 long and short block engines there too.
Relatively well priced and could be another option for you. A good lowish mileage full 2.5 WRX engine could be had for £1500-£1700.
If you don't want to use the AVCS you don't have to, just change the Drive-by-Wire throttle for the Drive-by-Cable from yours and you can use your own ECU and looms.
Alternatively if you do want the AVCS to work get yourself the ECU and wiring loom from a 2006/7 WRX and it's a fairly straightforward job to swap out cabin and engine/engine bay looms.
Could be a much cheaper alternative to a rebuild and a chance to get to know your car a bit better.
This is what i did but i chose to stick with a 2ltr lump but from an STi.
Relatively well priced and could be another option for you. A good lowish mileage full 2.5 WRX engine could be had for £1500-£1700.
If you don't want to use the AVCS you don't have to, just change the Drive-by-Wire throttle for the Drive-by-Cable from yours and you can use your own ECU and looms.
Alternatively if you do want the AVCS to work get yourself the ECU and wiring loom from a 2006/7 WRX and it's a fairly straightforward job to swap out cabin and engine/engine bay looms.
Could be a much cheaper alternative to a rebuild and a chance to get to know your car a bit better.
This is what i did but i chose to stick with a 2ltr lump but from an STi.
Would this do?
http://www.pistonheads.com/sales/3870859.htm
What if anything would I need additionally?
http://www.pistonheads.com/sales/3870859.htm
What if anything would I need additionally?
It looks the right way to go but it doesn't say if it's a short block (which means you would have to finish building it with your heads and other ancillaries) or a long block (which comes with heads and oil/water pumps etc...) so you would basically just have to attach all your other bits like turbo, inlet/exhasut manifolds, injectors etc... etc..., to finish it off.
Bottom end like that is worth having if you're going to make a build out of it otherwise for nearly the same money you could get a used lump, however, with a freshly built bottom end you know it's going to last and is brand new.
Bottom end like that is worth having if you're going to make a build out of it otherwise for nearly the same money you could get a used lump, however, with a freshly built bottom end you know it's going to last and is brand new.
I'm using a 2005 WRX box and running 360/350 with Redline Heavy shockproof. It does get a hard time, specially 3rd gear and it's doing very well. I wouldn't worry too much about the gearbox unless you're going well over 320-330bhp and up towards 350+, and then i'd be thinking about an STi 6spd box.
I saw a newage 6spd box the other day with drive shafts, propshaft and gear linkage etc..., for £1500. Bargain i thought
I saw a newage 6spd box the other day with drive shafts, propshaft and gear linkage etc..., for £1500. Bargain i thought
I think with the 2Ltr cars a ball bearing turbo and narrower uppipe is probably the way to go when running a bigger/more efficient turbo, might help shorten the lag and quicken spool a bit anyway.
My 20G is very good when it's on song but up to that point it's definitely ZZzzzzz..... Time to look around for a used BB turbo that'll make 450's.
My 20G is very good when it's on song but up to that point it's definitely ZZzzzzz..... Time to look around for a used BB turbo that'll make 450's.
So, bit of an update:
Turns out the noise I thought was piston slap was actually the bottom end failing. It hasn't actually gone yet but is getting worse.
So I need a fix, I have spoken to a few people and this is what I have found so far:
Eurospec - http://www.euro-spec2000.co.uk/
I have known Ben and Mark for years and they have looked after my last 3 cars. They can do a full rebuild for £2500 + vat.
API - http://www.apiimpreza.com/
Spoke to David at API and he certainly knows his stuff.full rebuild for £2550 + vat. He also said that due to the common nature of the bottom ends going, he can do a "fix" for £1600 + vat which is a partial rebuild.
And then I found this lot, who I had never heard of. They seem to give a cheaper option-
Eclipse performance - http://www.eclipse-performance.com/
They offer a rebuild for £1500 inc vat. At that price I'm guessing that it is a partial rebuild. They are in Sunderland which is a bit of a trek but I am willing to get the car up there if they are any good for that money.
They also do a 2.2 strokes kit which looks quite appealing.
I also need a clutch which shouldn't really cost anything in terms of labour as the engine will be out already.
So, over to you guys, any thoughts or opinions, particularly on eclipse would be appreciated.
I'm already getting depressed driving the 206 I've had to buy as a runaround while the impreza is off the road.
Cheers,
Dave
Turns out the noise I thought was piston slap was actually the bottom end failing. It hasn't actually gone yet but is getting worse.
So I need a fix, I have spoken to a few people and this is what I have found so far:
Eurospec - http://www.euro-spec2000.co.uk/
I have known Ben and Mark for years and they have looked after my last 3 cars. They can do a full rebuild for £2500 + vat.
API - http://www.apiimpreza.com/
Spoke to David at API and he certainly knows his stuff.full rebuild for £2550 + vat. He also said that due to the common nature of the bottom ends going, he can do a "fix" for £1600 + vat which is a partial rebuild.
And then I found this lot, who I had never heard of. They seem to give a cheaper option-
Eclipse performance - http://www.eclipse-performance.com/
They offer a rebuild for £1500 inc vat. At that price I'm guessing that it is a partial rebuild. They are in Sunderland which is a bit of a trek but I am willing to get the car up there if they are any good for that money.
They also do a 2.2 strokes kit which looks quite appealing.
I also need a clutch which shouldn't really cost anything in terms of labour as the engine will be out already.
So, over to you guys, any thoughts or opinions, particularly on eclipse would be appreciated.
I'm already getting depressed driving the 206 I've had to buy as a runaround while the impreza is off the road.
Cheers,
Dave
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