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Old 12-28-2009, 07:01 PM   #1
awdeclipseguy
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Join Date: Feb 2006
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Location: Northeast Pennsylvania
Default Engine build questions? Engine Builders help!!

I am looking for any engine builders(backyard or professional) input on how long it would take to install aftermarket Drop in pistons in a brand new shortblock. Let me set the scene:
Brand new subaru ej257 sti short block is on the bench and the aftermarket pistons are brand new in the box on the bench... Now go!!
What is the time frame we are looking at?? I am looking for the amount of time this one specific part of the build would take.
Also please provide if you are a hobbyist or professional. and any other important/relevant info.
Thanks in advance
P.S. Please don't flame this awkward situation as I am doing a little research.
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Old 12-28-2009, 07:09 PM   #2
MartinSTi05
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Location: Rockford, Il
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2006 wrx STi

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Hobbyist.....
I would say minimum three days to do it right, considering you are going to want have a proper hone done. On the off chance the the PW clearances are perfect as the block sits, 1.5 hours to swap pistons, and that is taking your time.
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Old 12-28-2009, 07:58 PM   #3
Agile Auto
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Location: Fallston, MD
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Professional...
Brand new short block from Subaru and aftermarket pistons in the box.
1. Remove oem pistons
2. Measure the bore on all cylinders
3. Open the box of pistons and measure the pistons
4. Gap the rings
5. Install rings on the pistons
6. Install pistons
7. Make sure that all installed properly.

Above operation may take up to 4 hours.

If you find that your pistons to wall clearances or what ever else is out of spec will require more time.
If you need/want to check bearing clearances for rod and main bearings this will take even longer.
Do you want to balance whole assy? It will take a little bit more, etc

I hope this will answer your question.

Artie
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Old 01-01-2010, 03:32 AM   #4
swr999
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PSM

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Quote:
Originally Posted by awdeclipseguy View Post
...how long it would take to install aftermarket Drop in pistons in a brand new shortblock....
Also please provide if you are a hobbyist or professional. and any other important/relevant info.
Hobbyist:
I'm not quite sure what you're getting at. Installing the pistons in the cylinders can go pretty quick. With a new shortblock I guess we can assume the bores are not tapered or ovalized. But the usual problem with "drop-ins" is getting the correct piston-wall clearance. And the appropriate hone. Different rings from different piston and piston ring manufacturers will usually specify the hone characteristics for their product. If the Subaru OEM hone is not appropriate for the rings on your drop-ins, this can be a problem. A re-hone means splitting the case and a lot more time. So, I guess if we knew why you need a time estimate you would probably get some more accurate responses .
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Old 01-01-2010, 08:31 AM   #5
FuJi K
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MY99 GF4 JDM 6spd
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gapping the rings takes a little while. lolz You got 16 rings to gap and check. Then put the rings on the pistons and oil them up. also make sure that open ends are facing opposite of each other. Next fun part is installing the wrist pins.

I just put my pistons in my block lastnight. Took a little bit. Pistons all set and ready go in within 30min with installation of wrist pin.
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Old 01-03-2010, 03:34 AM   #6
chuchin420
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2000 IMPREZA 2.5RS
metalic silver

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I'm a newbie and I was wondering what are the pros and cons of replacing my 02wrx block with an sti block, how much power gains will I get. I'm also wondering if it will be a direct fit or are there issues that I will run into along the way, I plan to use it as a dayli driver, and my power goals are 300hp to 350hp. whats the best route. I really need some insight on this as I will be doing it soon. please be as clear as possible.
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Old 01-03-2010, 03:36 AM   #7
chuchin420
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if anyone has some good info please let me know here or E-mail me at st3tball2003@yahoo.com.
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Old 01-03-2010, 03:54 AM   #8
chuchin420
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metalic silver

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I was olso wondering what's the max boost the wrx and the sti block can handle, my goal would be 20 to 22 lbs of boost.
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