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22 replies to this topic

#1 ivans imports

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Posted 11 September 2012 - 11:11 AM

I whant to put 6 wrx pistons in my 3.0 six has anyone done thiss ? very close in size and stroke and way way stronger have 2 3.0 sixs and like the engine but pistons were weak any ideas ? oh and i have my own boring bar and block bench setup for boring subaru engines

#2 CNY_Dave

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Posted 11 September 2012 - 11:50 AM

'Close' in bore and stroke?

So you'd have to bore your engine?

What about the piston compression height, deck height and chamber clearance/squish?

Edited by CNY_Dave, 11 September 2012 - 11:54 AM.


#3 avk

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Posted 11 September 2012 - 01:08 PM

What is wrong with the pistons? Are they really the weakest component in the rotating assembly? Just asking.

Edited by avk, 11 September 2012 - 01:18 PM.


#4 1 Lucky Texan

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Posted 11 September 2012 - 01:10 PM

Wat is wrong with the pistons? Are they really the weakest component in the rotating assembly? Just asking.


yeah - first I heard of this, plus, aren't some newer pistons having cracked land problems? Dunno that WRX would be an upgrade.

#5 WoodsWagon

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Posted 11 September 2012 - 10:45 PM

They have cracked land issues because the tune is run on the bleeding edge of detonation to meet EPA specs and fuel economy targets. It's likely they're also moving the top ring groove up closer to the crown to reduce the quenched area around the side of the piston where unburned HC's can lurk.

I would spend the money on the right size forged pistons before boring it out. You are talking a big jump in bore size which will probably require a re-sleeve. That money and effort is better spent on real pistons.

Get the tune right and keep dumping water/meth in there and the stock pistons should last a while.

#6 ivans imports

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Posted 12 September 2012 - 09:34 AM

the stock pistons are realy weak worse than 1600 pistons same dementions as the wrx one just slightly smaller the wrx ones are at least 50-70 % stronger by design and have a ceramic coating and a slight dish to drop comp ratios. I broke 2 pistons on thiss six runing on propane so was not detanating but the pistons just couldent take boost they are flat tops with realy thin sides and very little space between ring lands. Is there even any forged pistons avalible for a 3.0 six ?

#7 WoodsWagon

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Posted 12 September 2012 - 12:13 PM

pistons same dimensions as the wrx one just slightly smaller the wrx ones. Is there even any forged pistons avalible for a 3.0 six ?

http://www.ebay.com/...8-/330455563045

That's the first result I pulled up. Wouldn't hurt to call wiseco or any of the other big piston manufacturers and ask what they have.

A 2.8mm bore is big. The stock steel sleeves would probably be weakened enough by that to split under boost. So you're looking at re-sleeving the engine with these:
http://www.ebay.com/...a-/180882450033

You'd want to use forged WRX pistons too, so add that cost on top of the sleeves and the machine work.
That still leaves you with the stock rods. I found a few references to forged ones made by Pauter, but that's another $1400.
http://www.pauter.com/subaru.htm

#8 ivans imports

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Posted 13 September 2012 - 10:26 AM

nice parts bitt pricey trying to keep low budget wonder if i could bore it for sleaves myself ?

#9 Loyale 2.7 Turbo

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Posted 13 September 2012 - 10:37 AM

Why don't you take one Piston from the 6 and another one from the WRX and place 'em together for Visual comparison; that could be a start point: could you post some Pictures of both together, and their measurements?

Sometimes other people see what we couldn't see...

Kind Regards.


#10 WoodsWagon

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Posted 13 September 2012 - 09:32 PM

The WRX pistons are 2.8mm bigger diameter than the 3.0l ones.

#11 ivans imports

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Posted 14 September 2012 - 10:58 AM

I have both out on ground right now the wrx ones are bigger so it might not work i have six wrx pistons here waiting i would like to use what i have because the buggy is based of low budget raceing that what makes it competative and interesting raceing high budget guys with low budget platforms my engine is way cheaper than the big block guys i race and it bugs the crap outa them realy how mutch do's a 517 dart engine with alcholol injection and nitros injection realy cost so whos winning

#12 Loyale 2.7 Turbo

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Posted 14 September 2012 - 12:29 PM

The WRX pistons are 2.8mm bigger diameter than the 3.0l ones.


... the wrx ones are bigger so it might not work ...


...unless you send the Block to a Machine shop to change the Cylinders (Walls) on the 6 with the WRX ones, but that should be very expensive, isn't it?

#13 1 Lucky Texan

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Posted 14 September 2012 - 12:42 PM

would JDM turbo 2 liter pistons be closer?

#14 ivans imports

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Posted 15 September 2012 - 11:29 AM

i have my own boring bench setup for subaru engines was going to bore it myself but may not be enuff materail there also thiss is a dragrace block so could cement it posibly to hold liners together is a long term project and have two 3.0 engines to work with one has cracked block so would be a good candadate to try things with

#15 ivans imports

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Posted 16 October 2012 - 10:16 AM

hmm or bolt two 3.0 back to back and make a 6.0 48 valve flat 12 oh it even sounds good might be a tadd heavy but whould sound sweet. And use one monster turbo for both engines

#16 1 Lucky Texan

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Posted 16 October 2012 - 10:25 AM

Posted Image

#17 ivans imports

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Posted 16 October 2012 - 10:53 AM

man do i whant thiss engine !! bad ! looks like a mud dragster engine to me

#18 1 Lucky Texan

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Posted 16 October 2012 - 11:04 AM

that one was 3.5 liter I think. Used around 1990 in a Coloni Formula 1 car.

#19 ivans imports

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Posted 17 October 2012 - 10:49 AM

well two 3.0 = 6.0 L close but need more have two svx 3.3 that whould make 6.6 L closer butt still not enuff. To catch a blown acohall hemi think he was 2700 hp last time i checked did 200 ft mud pitt in 2.1 seconds take me a while to get there.

#20 1 Lucky Texan

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Posted 17 October 2012 - 11:47 AM

how about dual engine?

3 liter front + 3 liter mid-engine?

#21 ivans imports

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Posted 18 October 2012 - 09:36 AM

was thinking two bolted back to back with two speed power glide behind it with ford 9 inch in rear and subaru in front

#22 1 Lucky Texan

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Posted 18 October 2012 - 09:47 AM

a long time ago, I think Johnson brothers??? had a Honda Civic with an engine/transaxle in the rear too.

maybe I heard of a Smart car or some other tiny car recently built-up with a second engine?

#23 ivans imports

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Posted 18 October 2012 - 09:49 AM

thiss whould be a rail type car long and high hp wonder if could get a mega squirt that could run 12 cly at same time ?




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