Civic-EG.com Forum 3.3.1

- Sun Sep 21, 2008 7:22 pm #70813 Got my head swap done its a mini me. Non VTEC. Currently a D15B8 block with a PM3-1 D16A6 non vtec SI head and a long geared CX tranny. 200psi compression in all 4 cylinders running stricktly 93 octane for the high compression. Pulls nice through the top of the gears at higher RPMs but lags in the bottom end. Also some clutch slipage when i mash it. Gonna replace the clutch and flywheel, header, and a 50 shot on the bottle. Not gonna swap the tranny because we think its gonna pull through the bottom of the gears better and cmon i can pull 2nd to 85mph if i can set it up right it should be an ok combo on the bottle then with the long gears i will still get good gas mileage off the bottle. What do you guys think ?

- Sun Sep 21, 2008 7:33 pm #70814 get a shorter geared tranny it'll run better

92 civic cx sold!!
horizon gray 94 LX-A wrecked :/
white 92 civic Si (traded)
primered 94 teg sold
92 civic DX sold!!
93 red EX coupe parted out!
93 LS400 Midnight indigo sold!
92 civic LX sold!!
90 240sx sold!
93 faded black EX coupe

- Sun Sep 21, 2008 9:31 pm #70837 you will get pulled by lesser motors with better geared trannys.

1986 Nissan 300zx
1980 Kawasaki KZ650
2014 Kawasaki Ninja 300

- Sun Sep 21, 2008 9:43 pm #70840 So an EX tranny. I do alot of highway driving so really the SI is out.

- Sun Sep 21, 2008 9:57 pm #70842 Im gonna need more specs on the motor, cuz from what you say, you dont need 93. your only running 9.2:1 compression. B8 block with a a6 head? what pistons and crank rods..stuff like that.

Even with p29 pistons your only at 9.5:1. thats not exactly HIGH.

1986 Nissan 300zx
1980 Kawasaki KZ650
2014 Kawasaki Ninja 300

- Sun Sep 21, 2008 10:01 pm #70844 it has a D15B8 block with Flat top pistons not the round D16 ones a Y8 head gasket with the center taken out and it was decked. We estimated around 10.5 - 11:1

- Sun Sep 21, 2008 10:02 pm #70845 At 9.5:1 it should have 180psi max in each cylinder. It has 200

- Sun Sep 21, 2008 10:02 pm #70846 what pistons. that really helps. whats the CC and compression height? Are they honda pistons?

1986 Nissan 300zx
1980 Kawasaki KZ650
2014 Kawasaki Ninja 300

- Sun Sep 21, 2008 10:09 pm #70847 Yea they are the stock D15 Pistons they are flat top unlike the D16 which are dished. Thats why when you put a D16 head on a D15 block it bumps the compresion.

- Sun Sep 21, 2008 10:12 pm #70849 200psi, WoW u have 10:5+ id say, id run 93 octane, but DEF 89+

"If I see it, Then i can, If it changes, Then i will adapt. If i make mistakes, then i will learn."

- Sun Sep 21, 2008 10:14 pm #70851 Yea, your about 10-10.5:1 so 93 would be best. Still for the tranny, the EX/Si would be the best for you.

1986 Nissan 300zx
1980 Kawasaki KZ650
2014 Kawasaki Ninja 300

- Sun Sep 21, 2008 10:24 pm #70853 Yea Y8 head gasket whitch is the thinnest with the center piece removed. with a ported gsr throttle body port to match Z6 inake mani. EX fuel rail and a P28. It has alot more torque than my friends stock Y8 but the clutch slippage sucks.

- Sun Sep 21, 2008 10:25 pm #70855 Why do you have a p28 on a non vtec motor? Its not helping you.

1986 Nissan 300zx
1980 Kawasaki KZ650
2014 Kawasaki Ninja 300

- Sun Sep 21, 2008 10:30 pm #70858 The P05 wouldnt run it not enough fuel and all we has was a P28. I have gotten a P06 just dont have time to plug it in lol.

- Sun Sep 21, 2008 10:39 pm #70859

So an EX tranny. I do alot of highway driving so really the SI is out.

don't ex and si trannys have the same gearing?