<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SPOOLINmatt &raquo;</TD></TR><TR><TD CLASS="quote">i smashed a rod bearing once, and it only knocked between 2 and 2500-3000 rpm, no where above that or below. but i had just smashed it, it hadnt started spinning yet. </TD></TR></TABLE>


Could be from detenation or a stretched rod , i stretched a eagle rod in my last motor , and the bearing was smashed so thin cus one the big end got play , and with every power stroke it just beats the **** out of the bearing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C1CYA &raquo;</TD></TR><TR><TD CLASS="quote">Could be from detenation or a stretched rod , i stretched a eagle rod in my last motor , and the bearing was smashed so thin cus one the big end got play , and with every power stroke it just beats the **** out of the bearing.</TD></TR></TABLE>

Yup, detonation will cause a bearing to smash and can also bend rods slightly.

 

ok, cool, i was thinking detonation. but anyways so what back on topic, are my bearings showing signs of normal wear or is something wrong?

 

look like normal wear to me

 

My last LS/VTEC engine made 500whp and 350wtq and lasted well over 2yrs...At the end I started to experience a KNOCK similar to what your explaining...I tore the engine completely apart. Rod/Main bearing look fine...LMA's where fine...everything was fine...

The interesting thing I found was I noticed that on top of each of the pistons there were marks along the quench pads...I also found Identical marks on the quench areas in the combustion chamber...I remember when I assembled my motor the pistons stuck above the deck about .011"...and I still used a GE modified 85mm stock headgasket which is .030" thick...My cylinder head was a brand new B16A2 head from honda so I never thought to clay the motor for proper cylinder head to piston clearance... So from all my findings...My pistons were hitting the head..

What is your piston to cylinder head clearance...on the oldone's website he runs .035" piston/head clearance w/eagle rods... .045" w/stock rods...

 

i know this i probably a stupid question but......is there anyway possible to tell if the pistons are hitting the head without taking the head off?

and let me ask this if it was the piston hitting the head shouldnt it be doing it in all cylinders?


Modified by turbodohcsi at 5:51 PM 12/4/2005

 

well eagles do stretch , and how much was machined of the block after the sleeving ?? and have you ever had the head shaved ???

 

i bought the block used, so as for how much it was machined, im not sure, and yes the head was also machined flat, but i told them to take the very minimum off.

but if one of my pistons were hitting my head wouldnt it have a higher compression ration then the rest? and wouldnt my bearings be a little smashed? i mean i guess i could take the head off, i just really didnt want to. remember my compression ration was 190-200 all the way across.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbodohcsi &raquo;</TD></TR><TR><TD CLASS="quote">i know this i probably a stupid question but......is there anyway possible to tell if the pistons are hitting the head without taking the head off?

and let me ask this if it was the piston hitting the head shouldnt it be doing it in all cylinders?


Modified by turbodohcsi at 5:51 PM 12/4/2005</TD></TR></TABLE>

My head and pistons have marks on all four cylinders...How thick of a headgasket are you using? Do your pistons sit above the deck or below? When you go put your motor back together...use a thicker head gasket...

My new engine, the pistons sit above the deck .004" with the block deck at zero...My cylinder head is a brand new ITR unit from acura...I'm using a cometic .045" headgasket from cometic...so .045-.004=.041" piston to head clearance estimated...ENDYN specs are minimum .035" w/eagle rods. I will clay the motor to see what it actually is...

 

i was trying to avoid taking my head off, but i guess i will. i mean i doubt very seriously im hitting the head, but you guys are making me more paranoid. i am using a golden eagle (honda) 84mm headgasket, and when i was putting my motor together my pistons were flush with the deck, and i could tell because i laid a very flat device that i set on the block over each cylinder and none of the pistons cause the flat device to raise any. so i doubt very seriously that my pistons are hitting the head, but i dunno, we will see.

 

Its a learning process. You will probably never make these same mistakes again. This is why clearances...ALL of them are very important. Also gives to piece of mind..when you measure everything and triple check it...you won't worry because you KNOW that your assembly was not the cause of the symptom you're having

 

good news is i was right about the pistons NOT hitting the head, i knew i checked that many time cause it was a worry of mine since the block was decked, and the head was milled and i was running a stock head gasket, so thats ok. now i will just slap some fresh bearings in there and run with it.

 

So what are you going to attribute the sounds to? Just some good ole piston slap?

 

it wasnt piston slap, because pistons slap doesnt typically occur once the motor is warm, so i am going to say that it is from some of the lma's. the lma's do not have smooth motion they stick. so i think that is the knocking sound that i hear.