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Old 06-20-2008, 11:20 PM   #1
yellow03rex
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Default building an engine ?

just wondering how hard it would to diy drop in new pistons and rods before my bnib shortblock goes to get installed? does anyone have a link to a diy process breakdown? any help would be appreciated
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Old 06-26-2009, 01:55 AM   #2
pekoso1
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Someone Pls Help On This One?
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Old 06-26-2009, 01:59 AM   #3
yamahaSHO
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Are you asking how to build an engine? Beside balancing, honing, etc... What do you mean?
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Old 06-26-2009, 03:00 AM   #4
John__Gotti
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I think this is what you want, FAQ's are your friends.
http://forums.nasioc.com/forums/show....php?t=1435733
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Old 06-26-2009, 03:50 AM   #5
yellow03rex
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thread was over a year old but thanks
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Old 06-26-2009, 12:02 PM   #6
mick_the_ginge
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Quote:
Originally Posted by yellow03rex View Post
thread was over a year old but thanks
To my knowledge the Subaru shortblock has not changed much in the last 5 years so that thread is still correct

Basically you are asking if you can do drop in's. Some have good luck with drop in's some have bad luck and end up with a noisey engine.

In addition to removing the stock pistons (which IMO is easy) you will need to measure each cylinder to attain it's exact dimensions. You will then need to measure the pistons, calculate the piston to cylinder clearance and pop in the best matching setup.

You will also need to setup the ring end gaps which will require a ring grind tool.

If done right you will end up with a stock sounding engine with forged pistons.

If you do it wrong then the best case is you end up with a noisey engine, or worst case the engine seizes in the first startup and you are left with a block of scrap.

Cheers
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Old 06-26-2009, 12:05 PM   #7
mick_the_ginge
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Oh, sorry I did not see you wanted to do rods as well. Doing rods I do not class as a DIY job. You will need to split the block, measure all the tolerances, double check everything and if you get it wrong you will spin out a bearing. If this is a 2.5L block the rods are good to 500 WHP.... Stick with the stock rods and just do drop in pistons.
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Old 06-26-2009, 12:07 PM   #8
the suicidal eggroll
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Quote:
Originally Posted by yellow03rex View Post
thread was over a year old but thanks
And the engine you want to rebuild is 6 years old, that makes the thread 5 years newer than the engine you want to rebuild. What's the problem?
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Old 06-26-2009, 12:16 PM   #9
mick_the_ginge
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Now I also see that you own a wrx.... So are you doing a 2.0 or 2.5L you did not specify?

If 2.0 then the rods are weak and should be replaced.... it's not a novice DIY job.

Just do a 2.5L with forged pistons.... or buy one of the shortblocks which has forged pistons already installed. Cosworth, Raw (Ron), Crawford......
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