hi there, I would like to know which part in the engine would not take high mean piston speed??

is it the crankshaft, rod, wrist pin, piston skirt,...?

i've seen that 28m/s is about the max for the older top cars, but also that 32m/s can be achievable with parts made in the right material, what do you think about it??

 

I would think the HEAD and the bottom end would suffer alot.

 

yeah I know the bottom end would suffer, but which part, would the piston break, or would it be the rod bolts, just forget the head, let just assume that it can support that kind of flow

 

assuming the rod/bearing/rod bolts are strong then the thrust side of the piston skirts and exhaust side of the cylinder walls would wear out the most.

 

how high are you talking about?

the bottom ends can take a pretty high rpm.
its the valves that will end up floating.

 

with a r/s of around 1.97 would it considerably lower the wear on the piston skirt??

and why the exhaust side?? because of the higher heat generated??

how high, hmmm ;
28m/s 32m/s
B16 (3.047" stroke) 10 850rpm 12 400rpm
h23 (3.740" stroke) 8 840rpm 10 100rpm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JSMC &raquo;</TD></TR><TR><TD CLASS="quote">and why the exhaust side?? because of the higher heat generated??</TD></TR></TABLE>

Because on our cars, the exhaust side is the one taking the major load when the piston is going up on compression

 

ok so from my understanding, if our engine would have an opposite rotation, it would be the intake side????

 

ttt

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JSMC &raquo;</TD></TR><TR><TD CLASS="quote">ok so from my understanding, if our engine would have an opposite rotation, it would be the intake side????</TD></TR></TABLE>

yes

if stock the first thing to go would be the rod bolts or the rod from stretching

 

and for the piston skirt, would it be a good idea to have longer piston skirt than normal to help the force applied to the sleeve being more dispersed??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mistersparco &raquo;</TD></TR><TR><TD CLASS="quote">I would think the HEAD and the bottom end would suffer alot.</TD></TR></TABLE>

Thank you Captain Obvious!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JSMC &raquo;</TD></TR><TR><TD CLASS="quote">and for the piston skirt, would it be a good idea to have longer piston skirt than normal to help the force applied to the sleeve being more dispersed??</TD></TR></TABLE>

sounds like a good theory to me, but how longer of a skirt can you get in there? most engines i've worked on doesn't have that much space available for a bigger skirt. Another solution i can see is maybe coating the skirts with molybdenum (spel) coatings to help reduce friction, hence, decrease the temps that comes with high piston speeds..... off course, assuming all this is on a blueprinted engine, if not, i guess everything else is worthless

 

well the block will be decked of around 7/8"-1" to be able to have longer connecting rods for better r/s ratio! I'm assuming that would help me getting longer piston skirt.

the piston will be coated on the top and the skirt, SwainTech seem to have good reputation and experience, plus most of the parts will get cryo'ed.

and for the blueprinting, that's a weird term since it seems that their's 2 way of seeing it,

-the first would be building the engine to the factory spec, for me that would be, which specs, their's too much customization in this engine to have it to the factory spec
-the second is unclear, is it to bring all the parts to come in perfect combination so that would imply to make the engine build by another person, or is it that for eg. all the pistons have the same weight within few grams of differance?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JSMC &raquo;</TD></TR><TR><TD CLASS="quote">
and for the blueprinting, that's a weird term since it seems that their's 2 way of seeing it,

-the first would be building the engine to the factory spec, for me that would be, which specs, their's too much customization in this engine to have it to the factory spec
-the second is unclear, is it to bring all the parts to come in perfect combination so that would imply to make the engine build by another person, or is it that for eg. all the pistons have the same weight within few grams of differance?
</TD></TR></TABLE>

i'm not sure if i understoof you right, but, i think you have two things mixed, there's blueprinting, and it means checking every tolerance on the engine to match factory specs (even tough the engine is modded the specs still work fine, or at least that's what i think, unless you're a mechanical engieneer(spel) i wouldn't mess much with it), you can choose to be on the tight side or the loose side of the specs..
and there is balancing the bottom end, which means what you just say, stuff like balancing the pistons so they match the weight of the lighter one, also, you balance (like when you take the tire to be mounted on the rim, kinda the same principle) the flywheel (with the clutch assambly) the crankshaft, the rods (just like the pistons), etc....

 

well i'm mixing those 2 because on this board it's not pretty much clear from what i've read

and for the factory spec I suppose you are taling about the torque spec of all bolts???

 

i meant the bearing clearances and stuff.

BTW: blueprinting is not the same as balancing, altough is weird if you blueprint your engine and don't balance it.

 

ok, that maybe why this is confusinf sometime!