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My first engine build.
My first engine build.
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My first engine build.
My first engine build.
My first engine build.
My first engine build.
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Old 03-27-12, 05:11 PM   #1
BootsJunkie
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Default My first engine build.

So I don't see why I can't go for 400awhp

This is my first time building an engine, so I might have a couple questions. Right now my goal is a 400awhp DD, haven't decided on turbo size yet, but prolly something along the lines of a GTX3076R.
Once I break this motor in with the stock turbo, I'll upgrade the turbo/header after like 2-3K miles.
My current supporting mods are;
-TXS intake
-TXS FMIC and BOV
-TXS RFL Ti TBE
-TXS top-feed conversion
-(DW 850's waiting to be installed)
-Walbro 255
-Cobb AP
-Defi boost, oil temp, EGT gauges, Innovate WB02, Autometer oil press.
and some other things


Onto the pics. The shortblock that I picked up..

Bore gauging the cylinders



Phew, stock bore 99.5mm. Cylinder #4 was scratched and needed to be bored/honed



Got the machine work done by Rallispec, awesome, awesome guys and company!!!
Got it bored to 99.75mm, honed, decked, and cleaned, and they got me a brand new 08+ nitrided crank!


Mic'ing the brand new 99.75 CP's



Bore gauging the rod big ends



Is this how the pistons go!?!?



Rings gapped to .025" top, .030" bottom. A bit on the bigger side... think it'll be alright?



Mmmmmm brandd newww



Thought this was funny; a Subaru vs Honda crank
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Old 03-27-12, 05:56 PM   #2
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Default Re: My first engine build.

Wow, what engine did that Honda crank come out of? Good luck on the build, I'm going for the same power goal eventually. I'm letting someone else handle the engine work though.
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Old 03-27-12, 07:07 PM   #3
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Default Re: My first engine build.

looks like a lot of work. what are the brand/specs on the pistons and rods? how much you pick up the block for? i'm all for DIY if you've got the tools and know how. good luck!
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Old 03-27-12, 08:22 PM   #4
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Default Re: My first engine build.

Lookin' good, Boss!
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Old 03-28-12, 08:53 AM   #5
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Default Re: My first engine build.

Quote:
Originally Posted by Shamoo View Post
Wow, what engine did that Honda crank come out of? Good luck on the build, I'm going for the same power goal eventually. I'm letting someone else handle the engine work though.
Either an F22a1, or H23a1, I forget which. Both they're the same P/N.

Quote:
Originally Posted by wiering17 View Post
looks like a lot of work. what are the brand/specs on the pistons and rods? how much you pick up the block for? i'm all for DIY if you've got the tools and know how. good luck!
CP pistons, 99.75mm, stock 8.2:1 CR. And Carrillo A-beam rods, stock CR. I work for a bearing manufacturer (nothing automotive, tho ) so I'm using all their gauges and mic's for this, as well as the advice from all the other car guys here who've built motors.


Quote:
Originally Posted by Got2Boostit2 View Post
Lookin' good, Boss!

Thank you, thank you.

Any advice on my ring gaps? .025" top, .030" bottom?
CP specs are .0216 for the top, and bottom should be .004-.008 bigger. So I was shooting for .022" and .026, but overshot the 22 to 25, so then I needed to enlargen the bottom ring to keep the +4/8.
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Old 03-28-12, 10:54 AM   #6
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Default Re: My first engine build.

subscribed!
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Old 03-28-12, 12:35 PM   #7
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Default Re: My first engine build.

Quote:
Originally Posted by BootsJunkie View Post
Either an F22a1, or H23a1, I forget which. Both they're the same P/N.



CP pistons, 99.75mm, stock 8.2:1 CR. And Carrillo A-beam rods, stock CR. I work for a bearing manufacturer (nothing automotive, tho ) so I'm using all their gauges and mic's for this, as well as the advice from all the other car guys here who've built motors.





Thank you, thank you.

Any advice on my ring gaps? .025" top, .030" bottom?
CP specs are .0216 for the top, and bottom should be .004-.008 bigger. So I was shooting for .022" and .026, but overshot the 22 to 25, so then I needed to enlargen the bottom ring to keep the +4/8.
Ring seal and adequate room for ring expansion are more important than trying to eek out the last few thousanths of gap especially on a turbo engine. Even an extra .003" gap is only .024% of the ring contact circumference on a 4" bore. On my JE pistons I'm running about .02" on the top and .025" on the bottom, the bottom is a bit bigger than they recommend however my buddy taught me to open this one up a bit on a turbo car. I'm not an engine wizzard but I don't see anything out of wack on your specs.
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Old 03-29-12, 08:57 AM   #8
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Default Re: My first engine build.

Quote:
Originally Posted by 2.5i 17 View Post
Ring seal and adequate room for ring expansion are more important than trying to eek out the last few thousanths of gap especially on a turbo engine. Even an extra .003" gap is only .024% of the ring contact circumference on a 4" bore. On my JE pistons I'm running about .02" on the top and .025" on the bottom, the bottom is a bit bigger than they recommend however my buddy taught me to open this one up a bit on a turbo car. I'm not an engine wizzard but I don't see anything out of wack on your specs.


Hmmm ok cool.

What about the oil rings? CP says ".015 MIN, do not file".
My bottom oil rings are .020, but tops only .012". Should I be worried?



Also, I thinkkkkk my turbo oil seals are about gone.


I know an AOS won't completely eliminate the oil in the piping since the seals are already gone and the AOS is mainly for blow-by, but it'll filter the air/oil particles going into the engine, correct? But will that mess with my tune?
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Old 03-29-12, 10:46 AM   #9
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Default Re: My first engine build.

Quote:
Originally Posted by BootsJunkie View Post
Hmmm ok cool.

What about the oil rings? CP says ".015 MIN, do not file".
My bottom oil rings are .020, but tops only .012". Should I be worried?



Also, I thinkkkkk my turbo oil seals are about gone.


I know an AOS won't completely eliminate the oil in the piping since the seals are already gone and the AOS is mainly for blow-by, but it'll filter the air/oil particles going into the engine, correct? But will that mess with my tune?
I would not worry about the oil rings, I most certainly would not file these. You could always call CP and see what they have to say.

Another note, we had better readings when we bolted up a torque plate, I didn't read that you were using one or not.

As far as the AOS, there are so many kinds, I had to go to a peterson/element style can when I started pushing lots of boost as my old Crawford AOS was letting oil geting pulled into the intake on the 28 psi map. I think everyone needs to pick these based on their setups though the Crawford does work for most builds and you can always vent the vacum line into a can as they recomend if you go to the track.
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Old 04-02-12, 08:42 AM   #10
BootsJunkie
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Default Re: My first engine build.

Yea I'm leaning towards a Crawford AOS.


Started plastigauging my rod journals last week with the old bearings, which have a HORRIBLE surface finish on them, no idea why they look so terrible. I got .0015" on #1 and 2 rods, so I'm thinking of gettin the ACL HX's with the extra .001" of clearance.
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