I'm building a all motor LS vtec and as for my bottom end; Can i still just use my crank as is, without balancing it and knife cut and micro polish it? My LS motor ran perfect b4 i started stripping it down and start building my LS vtec. And my second question is; With me using the crank as is; I'm planning on using a CTR pulley; Would it be just fine if I balance the entire ratating assembly after the bottom end id complete?..thanks guys..

 

i'm running a LS/VTEC you can run a stock crank without all the work but you will ruin the rings faster if you are racing it alote. i have about 5000 miles on my build with a stock bottom and no problems. i was told you can usualy get 10,000 to 15,000 miles out of a motor that way before you need to replace the rings.

 

what rings exactly are you talking about??...bearings??

PM'ed

 

Without balancing the bottom end you will loose some reliability along with it not being as safe to rev up as high

For the record im no were near a pro


Modified by turboZChatch at 2:32 PM 2/25/2008

 

Good to see that the professionals answered your questions. Honda engineers get over 100,000 miles out of their motors, but a purpose built street motor is only good for 10-15,000? Good to know.

The stock Honda crank is very good; there is no reason that you would not have success with an untouched stock crank that is in good shape. Balancing the rotating assembly is a good idea if you plan on spinning the motor to 8,000 RPM+.

 

search around about ctr crank pulleys too, i wouldnt use one personally. if you want a better pulley look into a fluid dampner (i believe thats the name?)

otherwise i dont see any reason stock doesnt work imho.

or you could have a stock pulley lightened and balanced into your rotating assembly, but if you do this make sure you balance in the clutch/flywheel also.

i limit my ls/vtec to 8300rpm anyway, so i kept a stock bottom end.

(disclaimer:im not a professional, b19coupe is...ive just read enough of his and other posts to kind of know what im doing lol )

 

on a built bottom end you should get alot of miles out of it. but when you are running a bottom that is not designed to spin that high of rpm you will cause falilure. and most all motor setups spin untill 8,500 to 9,000.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by getsome.crx &raquo;</TD></TR><TR><TD CLASS="quote">and most all motor setups spin untill 8,500 to 9,000. </TD></TR></TABLE>
One has to wonder why spin an engine to 9,000 RPM when in most cases it is clearly unnecessary. Case in point:

Another question that comes to mind when reading the statement "most all motor setups spin untill 8,500 to 9,000", did you take a survey? Have you compiled a database of dyno sheets that validate your claim? Please educate us

 

This thread makes me laugh. I really don't know what say......

 

B19 what engine is that a dyno sheet of? Sorry if it says the setup on the page I can't read it on my phone at work

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Runnerdown &raquo;</TD></TR><TR><TD CLASS="quote">This thread makes me laugh. I really don't know what say......

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

Lol, yeap this is a good one.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turboZChatch &raquo;</TD></TR><TR><TD CLASS="quote">B19 what engine is that a dyno sheet of? </TD></TR></TABLE>
It's an LS/VTEC with a 92mm crank and an 85mm bore.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">It's an LS/VTEC with a 92mm crank and an 85mm bore.</TD></TR></TABLE>

Nice power