EJ22 Turbo pistons - Page 4

svxfiles · #46 12-02-2005, 01:57 PM

Quote:

Originally Posted by SVXRide

Anyone want to do the math if we got our stock crank stroked by a 1/4 inch, use the higher compression turbo pistons with say a .020 overbore (to clean up the bores - assuming we can get the turbo pistons in a .020 oversize), and work over our stock connecting rods (shot peen, mangnaflux, etc.)?

I'm thinking a 3.5-3.6 liter engine with around 9.5:1 compression might be a nice "winter project"

(okay, so custom pistons to get the compression back up is probably in the cards..)

-Bill

¼” stroker
If you offset the crankpin 1/8”, you increase the stroke ¼”
2.95” stroke plus 0.25” = 3.20”
3.815 bore (R = 1.9075)
SA = 11.430851 X 3.20=36.578723 per cylinder CID X6 = 219.47233 Total CID

3.815 + 0.020 = 3.835 (R=1.9175)
SA = 11.551017 X 3.20=36.963254 per cylinder CID
X6 = 221.77952 Total CID
221.77952 CID = 3634.9663 CCs

oab_au · #47 12-03-2005, 02:31 PM

Quote:

Originally Posted by svxfiles

¼” stroker
If you offset the crankpin 1/8”, you increase the stroke ¼”
2.95” stroke plus 0.25” = 3.20”
3.815 bore (R = 1.9075)
SA = 11.430851 X 3.20=36.578723 per cylinder CID X6 = 219.47233 Total CID

3.815 + 0.020 = 3.835 (R=1.9175)
SA = 11.551017 X 3.20=36.963254 per cylinder CID
X6 = 221.77952 Total CID
221.77952 CID = 3634.9663 CCs

The comp ratio would go to 10.9:1, and the piston would punch a 1/8" hole in the head. You would need shorter rods, or the pin lowered in the piston.

Harvey.

svxfiles · #48 12-03-2005, 08:14 PM

Quote:

Originally Posted by oab_au

The comp ratio would go to 10.9:1, and the piston would punch a 1/8" hole in the head. You would need shorter rods, or the pin lowered in the piston.

Harvey.

I just did the math,

I am actually considering a "big block" 3.3/3.75 H6.....
All We need is more time, and more money...

longassname · #49 12-07-2005, 04:11 PM

Can you cc the ej22 turbo head please? Might as well do the svx head while you are at it too, if you could. I've got a set of ej22 turbo pistons on the way for my svx engine build and I'll make accurate comparative measurements of the pistons. If you cc the heads we can attack the measurement issue from both sides and presumably come up with the same answers.

Quote:

Originally Posted by OBI

I noticed when i was comparing the pistons side by side that its the svx piston crown that causes the extra length not the rod. I believe the rods are the same length. tom and i are gonna measure the rods and were gonna know for sure. By the way the piston passes the deck only about .010" you could hardly tell.

OBI · #50 12-07-2005, 04:36 PM

Quote:

Originally Posted by longassname

Can you cc the ej22 turbo head please? Might as well do the svx head while you are at it too, if you could. I've got a set of ej22 turbo pistons on the way for my svx engine build and I'll make accurate comparative measurements of the pistons. If you cc the heads we can attack the measurement issue from both sides and presumably come up with the same answers.

No problem. I could cc the 2.2 turbo head but i cant cc the svx heads. can enyone else contribute to this cause? I dont want to take the eg33 apart yet i want to run it n/a for a while till i build a turbo 3.3 block which i still havent purchased yet.

OBI · #51 12-07-2005, 04:41 PM

Quote:

Originally Posted by oab_au

Can you do a picture of the two pistons together, I would like to compare
the tops.

Harvey.

Im finaly getting a digital camera, i will have pictures up soon.

longassname · #52 12-07-2005, 04:42 PM

Good deal,

If nobody else has done it yet I'll cc the svx head on the engine I take about for the build.

Quote:

Originally Posted by OBI

No problem. I could cc the 2.2 turbo head but i cant cc the svx heads. can enyone else contribute to this cause? I dont want to take the eg33 apart yet i want to run it n/a for a while till i build a turbo 3.3 block which i still havent purchased yet.

oab_au · #53 12-07-2005, 05:20 PM

Quote:

Originally Posted by longassname

Good deal,

If nobody else has done it yet I'll cc the svx head on the engine I take about for the build.

Yes the missing link Michael, I've worked the clearance vol, can guess the head gasket vol, just don't know how much of the clearance vol is taken by the piston. We will know the full story with the chamber vol.

Harvey.

dieingSVX · #54 12-07-2005, 06:27 PM

i'd help if i could, my heads are off the engine, just not sure how to get the right measurement

oab_au · #55 12-07-2005, 06:36 PM

Quote:

Originally Posted by dieingSVX

i'd help if i could, my heads are off the engine, just not sure how to get the right measurement

OK smear a bit of vasoliene over the face of the head, put a piece of perspec with a 1/4" hole in the center over the combustion chamber, and fill the chamber through the hole with a very light oil,from a graduated flask. It will take about 70ml, so start with a full 100ml flask. See how much is left in the flask when the chamber is full.

We thank you from the very bottom of our hearts.

Harvey.

longassname · #56 12-07-2005, 06:40 PM

Maybe you mistook the tone of what I was saying? I'm not really in the habit of making those kinds of comments. I have gotten frustrated and annoyed with things that have come up in my threads at times but it usually takes a good deal of persistence to push me over the edge and into unpoliteness. My appologies none the less, whatever it was.

You may want to consider sending that bracket to Tom. Then you'd be helping him rather than me.

Quote:

Originally Posted by dieingSVX

no offense to lan, but i asked him for an idea or something a while back and i don't know remember what he said i just remember it being a dick comment. so i'll keep my altenator bracket.

#57 12-08-2005, 02:46 PM

subaru dealer, the closest to me is in vinlenad i have a friend that works there for the parts dept. he looked up pistons to make the svx a 3.6-3.8 ( somewhere there ) liter engine hehe. i ordered them, hehe

Chiketkd · #58 12-08-2005, 02:55 PM

Quote:

Originally Posted by SlonSVX5mt

subaru dealer, the closest to me is in vinlenad i have a friend that works there for the parts dept. he looked up pistons to make the svx a 3.6-3.8 ( somewhere there ) liter engine hehe. i ordered them, hehe

How much did they run you? That will be a major labor bill unless you do the work yourself!

-Chike

SilverSpear · #59 12-08-2005, 03:24 PM

Quote:

Originally Posted by SlonSVX5mt

subaru dealer, the closest to me is in vinlenad i have a friend that works there for the parts dept. he looked up pistons to make the svx a 3.6-3.8 ( somewhere there ) liter engine hehe. i ordered them, hehe

lower compression? or larger bore? (pistons)

OBI · #60 12-08-2005, 03:25 PM

Quote:

SlonSVX5mt subaru dealer, the closest to me is in vinlenad i have a friend that works there for the parts dept. he looked up pistons to make the svx a 3.6-3.8 ( somewhere there ) liter engine hehe. i ordered them, hehe

Here's something you obviously dont know. Unless you are sleeving your motor you can forget about 3.6-3.8 displacement. The eg33 block can only be bored out to .50 mm as per factory manual, any more than that and the cylinder walls will get to thin. So let me do the math for you, max bore size you can get the motor to is 97.395 x 75 bore is 3.353cc which is not much difference from the stock 3.318. I hope you havent payed yet lol.