the.hamburglar

i have nearly 600 miles on my car since i did the rebuild. my setup consists of arias pistons (81.5mm) with a .0035 piston to wall clearence that was measured on each hole and all the correct piston ring end gaps. at first i had alot of blowby, but now that my motor is almost broken in it seems to have gotten worse. at idle there is a nice trail of smoke coming out of the breather filter on the valve cover and it stinks in the car. is this normal or what? the good thing is that it seems to go away when i rev it a little. i have an 8.57:1 compression ratio and iv got about 175+-2psi in each cylinder.
thanks

Boostfed

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by the.hamburglar &raquo;</TD></TR><TR><TD CLASS="quote">i have nearly 600 miles on my car since i did the rebuild. my setup consists of arias pistons (81.5mm) with a .0035 piston to wall clearence that was measured on each hole and all the correct piston ring end gaps. at first i had alot of blowby, but now that my motor is almost broken in it seems to have gotten worse. at idle there is a nice trail of smoke coming out of the breather filter on the valve cover and it stinks in the car. is this normal or what? the good thing is that it seems to go away when i rev it a little. i have an 8.57:1 compression ratio and iv got about 175+-2psi in each cylinder.
thanks

</TD></TR></TABLE>


Are you boostin it yet? My 83mm set up with the ****GASP**** same piston to wall clearance that made 714whp in a Dynapak. #1 and #3 pistons were scuffed bad deu to heat expansion. Arias have a very very very low silicon content and they expand more that most aftermaket pistons I have been told. By now you should have no blowby like that, any type of catchcan set up?

the.hamburglar

no catch can setup. just an open filtr off the valve cover and i took out the pcv valve

the.hamburglar

did your motor knock when cold?

Boostfed

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by the.hamburglar &raquo;</TD></TR><TR><TD CLASS="quote">did your motor knock when cold?</TD></TR></TABLE>

When we first got it on the dyno it was good BUT after about 10 pulls it started to have blow by bad filling up the catchcan one pull. Also started to blow my oil dipstick out WHICH I have never ever had an issue with prior to this. No knocking at all , I am sure you are talking about Piston slapo, that is normal really until the pistons heat up and expand

alpha

Dont quote me but I remember Arias pistons requiring a larger piston to wall clearance than that on turbo applications

Boostfed

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alpha &raquo;</TD></TR><TR><TD CLASS="quote">Dont quote me but I remember Arias pistons requiring a larger piston to wall clearance than that on turbo applications</TD></TR></TABLE>


NO THEY DON'T. THOUGH you SHOULD.

My mahcinist called and they recommended 3.5 thousands EVEN though we sadi for 800whp, they said yes 3.5 thousandths. Though you should run looser clearances definately

the.hamburglar

ya i called them to and said i was hoping to make about 300whp. they said 3.5 thou is recommended. so its going to be like this forever? its not blowing out my dipstick though!!! maybe ill have to look into other catch can option like running steel lines off the front of my valve cover

the.hamburglar

looser clearances will give you more blowby right?

Monstah

@ 600 miles, I wouldn't expect any blowby like that from the rings, unless you had one break during install (**** happens).

I'd recommend you try hooking the pcv up with a catch and see if it helps.

the.hamburglar

do you think a pcv could help? i know that i catch can will work becuase it should have more baffling, but that will just hide the problem, not solve it.

with broken rings i wouldnt have 175psi compression in all 4 holes right?

eg:R

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by the.hamburglar &raquo;</TD></TR><TR><TD CLASS="quote">looser clearances will give you more blowby right?</TD></TR></TABLE>

i would like to know the answer for that too

riddlinkid1986

I have blow by on my stock b16a2 on 8psi. Its not to bad tho, like after a week or a few hot days driving ill see some oil on my fuel rail. Wipe it off

But it shoulds like somthing is not right for sure if you fill up your catch can after a few pulls! I dont have one yet tho, an would like to get one.

I have 180psi in each cyl. I Run 10-30w oil.


Maybe your rings have rotated an your gaps got inline..... BUMP for you!

stockb18c

need a vaccum pump or put the pvc back on