Hey,

This is totally theoretical, I'm not gonna do it. But let's say someone put a stock B16a2 head on a stock B18B block:

What would be the weak part of the setup?
What would most likely be the cause of failure?
What would the power output be?
What would it redline at?

Again, theoretical.

Thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by litterbox &raquo;</TD></TR><TR><TD CLASS="quote">

What would be the weak part of the setup?
What would most likely be the cause of failure?
What would the power output be?
What would it redline at?

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

-what do you mean weak part? what will break? what could be better?..... what?
-why do you think it would fail?
-dunno, every motor is different. 120-140whp?
-it will redline at whatever the fuel cut off is set at.

these answers are vague, because you question(s) are vague. what are you trying to figure out?

im not saying this thread should be stopped, but you should also search. i believe if you search/read for a good 1-2 hours you will be amazed at what you find. if you have a somewhat more specific question, just ask that.

 

Hey, thanks for replying. I have been searching and here's the thing about the reliability issue that I don't get. Everyone in all the threads I've read have said that if it's built right, it'll be reliable. So I'm guessing that building it wrong is just slapping a stock head on a stock block. Is that wrong?

About the weak part: what do you think will inevitably kill the engine? I mean, would it be likely to spin a rod? Would you have clearance issues? That sort of stuff. I'm just trying to get a feel for lsvtec's from those with experience.

Sorry for being vague.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by litterbox &raquo;</TD></TR><TR><TD CLASS="quote">Hey, thanks for replying. I have been searching and here's the thing about the reliability issue that I don't get. Everyone in all the threads I've read have said that if it's built right, it'll be reliable. So I'm guessing that building it wrong is just slapping a stock head on a stock block. Is that wrong?</TD></TR></TABLE>

yes, and no. if built right it is just as reliable as any other motor, that is correct.

the problems happen because of this; people take their 100k+ b18a/a bottom and they slap a vtec head on it. no problem so far, as long as it is put together correctly. but then, they take that motor and they beat it to hell. the wind it all the way up to 9k+ because now they have a v-tak head.

from all of my knowledge about motors and lsvtecs in particular, this is the reason any motor breaks down, people dont build them right, they use the motor outside of its capabilities, or both.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by litterbox &raquo;</TD></TR><TR><TD CLASS="quote">About the weak part: what do you think will inevitably kill the engine? I mean, would it be likely to spin a rod? Would you have clearance issues? That sort of stuff. I'm just trying to get a feel for lsvtec's from those with experience.</TD></TR></TABLE>

it would most likely be that you spin a rod bearing, or the stock ls rod bolts stretch/break. both of these would happen, as stated above, from running the motor outside of its capabilities.

so to answer your question as a whole, if you put a mechanically sound vtec head on a mechanically sound ls bottom, and dont do things to the motor that it cant handle, e.g. over revving, then it will be just fine.

basically you need to drive the motor like it is a stock ls motor, because that is all the bottom end is capable of handling. however you will gain performance from the vtec head, even if you dont wind it up to 9k.

 

Ok cool, now if you wanted to fortify the bottom end for higher revving using oem parts what could you do besides pistons? Would ls rods be the best for the application?

 

-balance the entire rotating asymbly
-all new bearings
-arp rod bolts
-block gaurd

will all help.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by litterbox &raquo;</TD></TR><TR><TD CLASS="quote">What would be the weak part of the setup?
What would most likely be the cause of failure?
What would the power output be?
What would it redline at?
</TD></TR></TABLE>


- Low compression, rod bolts.
- rod bolts, inadequate oiling.
- 130'ish
- 6800-7000.

 

What is the purpose of having the rods repinned? Is that absolutely necessary if you're planning to rev to 8k?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by litterbox &raquo;</TD></TR><TR><TD CLASS="quote">What is the purpose of having the rods repinned? </TD></TR></TABLE>

I dont know what repinning is.

 

i assume you mean shot peened.

that term is thrown around too loosely in my opinion.

after talking with rocket about it i dont believe it is nessisary. why? because the rods are shot peened from the factory, and he thinks it better to just go with that than to mess with it. some people on the other hand believe it is a must....

but if you do have the rods "shot peened" what they are really doing is removing the factory shot peen, resurfacesing the rods to get rid of any imperfections and thefore reducing failure point in the rod. THEN you have the rod re-shot peened.