cp pistons in sr20det, oiler clearance - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

maxwagner · 11-04-2013, 05:23 PM

I was trying to put in cp 86.5mm 8.5:1 compression pistons and I noticed on the oem piston that it had kind of like a cut out specifically for the oiler.
So I put the piston down into the cylinder and spun the crank to its lowest point and the oiler didn't hit it but it was extremely close.

does anyone know the clearance from the piston to the oiler?
has anyone grinded the pistons down in that area, to get a little more clearance?
kind of a weird question, I just don't want a oiler breaking off for such a simple fix.

pete240 · 11-04-2013, 06:10 PM

That's the same problem with the mahle pistons I ordered. They recommended grinding the locator nub on the squirter and clocking it so it clears the skirt.

jr_ss · 11-04-2013, 06:35 PM

You'll be fine... You can't hyper extend or rotate the crank and have the piston travel further down the cylinder unless you blow a rod through the block. In that case oiler clearance is the least of your issues.

Def · 11-04-2013, 06:49 PM

I thought CPs had a small notch for the piston oil squirter? Or am I imagining things?

jr_ss · 11-04-2013, 07:56 PM

Quote:

Originally Posted by Def

I thought CPs had a small notch for the piston oil squirter? Or am I imagining things?

As far as I know, they do. He is worried about the close proximity it comes to when at BDC.

rotation3x · 11-04-2013, 08:02 PM

installed cp 9:1 86mm pistons in my sr and have no problems with the oil squirters clearing piston skirt they are closer than oem pistons

KoukiMonsta · 11-07-2013, 11:16 AM

you will be fine, i run a similar setup

11-04-2013, 05:23 PM	#1
maxwagner Join Date: Aug 2013 Location: seattle Posts: 22 Trader Rating: (0) Feedback Score: 0 reviews	cp pistons in sr20det, oiler clearance I was trying to put in cp 86.5mm 8.5:1 compression pistons and I noticed on the oem piston that it had kind of like a cut out specifically for the oiler. So I put the piston down into the cylinder and spun the crank to its lowest point and the oiler didn't hit it but it was extremely close. does anyone know the clearance from the piston to the oiler? has anyone grinded the pistons down in that area, to get a little more clearance? kind of a weird question, I just don't want a oiler breaking off for such a simple fix.

11-04-2013, 06:35 PM	#3
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,415 Trader Rating: (35) Feedback Score: 35 reviews	You'll be fine... You can't hyper extend or rotate the crank and have the piston travel further down the cylinder unless you blow a rod through the block. In that case oiler clearance is the least of your issues. __________________ My SR20VET Does your VTC gear rattle in your S14/15 SR? PM me.

11-04-2013, 06:49 PM	#4
Def Post Whore! Join Date: Apr 2004 Location: Houston, TX Posts: 2,701 Trader Rating: (16) Feedback Score: 16 reviews	I thought CPs had a small notch for the piston oil squirter? Or am I imagining things? __________________ S13 Hatch - Goes around tracks quickly DEFSPORT

11-04-2013, 06:10 PM	#2
pete240 Leaky Injector Join Date: Mar 2007 Location: SATX Age: 37 Posts: 124 Trader Rating: (4) Feedback Score: 4 reviews	That's the same problem with the mahle pistons I ordered. They recommended grinding the locator nub on the squirter and clocking it so it clears the skirt.

11-04-2013, 08:02 PM	#6
rotation3x Zilvia Member Join Date: Jun 2005 Location: virginia Age: 39 Posts: 272 Trader Rating: (2) Feedback Score: 2 reviews	installed cp 9:1 86mm pistons in my sr and have no problems with the oil squirters clearing piston skirt they are closer than oem pistons

11-07-2013, 11:16 AM	#7
KoukiMonsta Nissanaholic! Join Date: Mar 2009 Location: NC Posts: 1,969 Trader Rating: (23) Feedback Score: 23 reviews	you will be fine, i run a similar setup