Some may have paid attention to my sleeving post recently.. anyways I am getting ready to have my b16 block sleeved. Most sleeves can be bored to 84-85 mm.. my question is the extra displacement worth the thinner walls? obviously im going to be pushing alot of boost (at least 18psi normally and 28-30psi track im hoping).

 

Boost in this case is irrelevant; however, if i was to spend the money necessary to get an engine sleeved, i would not start out with anything larger than an 83mm bore. You CAN start with something larger, but if it ever did come apart, you wouldnt have a lot of room to hone and rubuild.

 

this is true.. im leaning toward sticking with a stock bore

 

stock bore on a b16 is all you need to start with, save that 82-84 untill you NEED it, no need to start with it and end up having to resleeve

i made 503 on stock sleevs on 21 psi with crower/weisco combo.. never had a problem, HG blew and it was time for a full build

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbociv910 &raquo;</TD></TR><TR><TD CLASS="quote">stock bore on a b16 is all you need to start with, save that 82-84 untill you NEED it, no need to start with it and end up having to resleeve

i made 503 on stock sleevs on 21 psi with crower/weisco combo.. never had a problem, HG blew and it was time for a full build</TD></TR></TABLE>

Who are you? i might know you? im in good ole wilmiwood myself

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ShortbusEK &raquo;</TD></TR><TR><TD CLASS="quote">Some may have paid attention to my sleeving post recently.. anyways I am getting ready to have my b16 block sleeved. Most sleeves can be bored to 84-85 mm.. my question is the extra displacement worth the thinner walls? obviously im going to be pushing alot of boost (at least 18psi normally and 28-30psi track im hoping). </TD></TR></TABLE>
Thats not that much boost. I've run 48PSI on a 84.50mm bore. You will be fine at 84mm and if you hurt the motor, you can go 84.5mm and so on.

 

ok so my ALOT of boost is not the same as you ALOT of boost but im also talking about a car im gonna be driving on a semi normal basis and I want it to last.. but say I did bore it out to 84mm thats 3mm off the thickness of the cylinder wall.. is the extra displacement worth weakening the cylinder walls for what we might as well call a DD.. what kind of HP/TQ gain am I looking at from the extra displacement?

 

I'm trying to tell you that if I can boost 48psi and your only going to boost 26psi, you'll be fine. When I drove my car <U>daily</U> on a Greddy T78 I was tuned for 19PSi on pump and 30 PSI on race gas, this was on 84mm pistons. I had no problems for 2 years and that was at least 60 miles a day. Aftermarket sleeves are alot stronger than you would think.

 

We've run 60psi on 85mm bore with no problems. If you're going to sleeve, might as well take advantage of the displacement that can be gained, it makes a significant difference in power, torque, and spool. There is NO downside to bigger bore. I start all my motors at 84mm bore. You can blow it up 3 times before it's junk, and if you get to that point you really need to re-evaluate things because you shouldn't be blowing up that many motors. haha

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">We've run 60psi on 85mm bore with no problems. If you're going to sleeve, might as well take advantage of the displacement that can be gained, it makes a significant difference in power, torque, and spool. There is NO downside to bigger bore. I start all my motors at 84mm bore. You can blow it up 3 times before it's junk, and if you get to that point you really need to re-evaluate things because you shouldn't be blowing up that many motors. haha</TD></TR></TABLE>


Is there any significant reason to go to 84 over 83mm? does that minimal amount make a difference?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">We've run 60psi on 85mm bore with no problems. If you're going to sleeve, might as well take advantage of the displacement that can be gained, it makes a significant difference in power, torque, and spool. There is NO downside to bigger bore. I start all my motors at 84mm bore. You can blow it up 3 times before it's junk, and if you get to that point you really need to re-evaluate things because you shouldn't be blowing up that many motors. haha</TD></TR></TABLE>
True story

 

point taken.. 84mm bore here i come.. does anyone know what the math is to calculate the extra displacement gained from the extra bore??

 

3.14 x radius squared= area of a circle..x stroke = displacement of cylinder..x 4 cylinders= displacement of the motor..come on, I dropped out of high school and I know this..

 

3.1416 * bore * bore * stoke / 1000