egmike

K so I finally got my engine assembled and got it running, It only seems to be noisy when is cold , noise is mosty gone when warmed up
Here is the set up-

D16z6 w/stock sleeves
CP 9:1 75.5 mm Pistons
Scat Rods
New OEM Mains (clearances platigaged to 0.0014 to 0.0015 on all 5 journals)
New Clevitte 77 Rods bearings (clearances were 0.0011-0.0013 on all 4 rods)
New Seals Valve, main, & oil Pump
Cometic 75.5mm 0.030 Head Gasket
Arp Headstuds
Head is stock , Valves have been adjusted Intake 0.008 and Exhaust 0.009 when cold
Block has Been Decked (I measure about 0.008 was removed)
Head was Milled (not sure what was taken off..... I'd guess a few thou)
Oil Pressure is good cold start up is almost 70 (I have it tee'd off going to the turbo)
I havent been boosting on the engine yet my BOV is removed so air can vent

Timing set at 16 deg

The noise is not noticable when driving and doesnt seem to get any louder when reving the engine at idle

A reputable shop here in calgary did the machine work on the block and was bored out to 3.5 thou piston to wall Clearance, My block was done at the same time as my buddys (legendboy) and his came out with no probs, he has cp pistons aslo.

I have about 25 km on the block so far and seems rings have started to seat as I did compression test and was about 160 across all 4 +/- 1 psi between cyl. 1st Oil change had no metal shavings in it at all and was clear as hell. Running Sae 30 oil with no detergent.

Here is a vid from cold -- Please Save as..

http://www3.telus.net/turbofreak/Temp/cold.MPG

Here is a vid from warm

http://www3.telus.net/turbofreak/Temp/warm.MPG


Its soulds like piston slap to me but I want some other opinions

boostincoupe

Is this normal with built motors?

EJ1 wilcox

Doesn't sound unusual to me... those pistons have floating pins in them, they are going to be more noisy than stock pistons.

EARLdaSQUIRREL

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EJ1 wilcox &raquo;</TD></TR><TR><TD CLASS="quote">Doesn't sound unusual to me... those pistons have floating pins in them, they are going to be more noisy than stock pistons.
</TD></TR></TABLE>
id have to agree and its prob a lil piston slap untill they get up to temperature

non-VTEC

my built motor sounds like crap when cold also......i would say its normal....

Muckman

iTrader: (2)

It shouldnt sound like crap. Whats your piston to wall clearance and what brand pistons?

*Edit: Was asking non-VTEC


Modified by Muckman at 10:25 AM 9/16/2005

egmike

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman &raquo;</TD></TR><TR><TD CLASS="quote">It shouldnt sound like crap. Whats your piston to wall clearance and what brand pistons?</TD></TR></TABLE>

not sure if ur askin me or non-vtec but mine are CP's , The clearance should have been 3.5 Thou 0.0035 as per the spec sheet which was given to the machinist. my buddy corey (Legendboy) checked with his dial bore gauge and it came out to about 0.0035, I dont remenber the exact number

maddog20

I have almost the exact same bottom-end set-up. Sounds maybe a little better than yours but still noisy.

what is your complete set-up and goals? Just curious?

aakeobo

Isn't .0035" piston-wall clearance a little large. Ive dealt with Wiseco and Arias. I know this is only a reccommendation from them and its really up to the builder what the specs should be, but the manufacturer still only recommended nothing bigger than .003" piston-wall clearance.

egmike

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by maddog20 &raquo;</TD></TR><TR><TD CLASS="quote">I have almost the exact same bottom-end set-up. Sounds maybe a little better than yours but still noisy.

what is your complete set-up and goals? Just curious?</TD></TR></TABLE>

My goal is for around 300whp maybe a little more

here is my current turbo set up

Garrett 57 Trim TO4E .50 cold .48 hot
450cc DSM injectors
Walbro 255 LPH Intank Pump & B&M FPR
Uberdata 1.7 Tuned using TE 2.oA Wideband
SSAutoCrap Equal length Mani
2.5 " DP
3" Exhaust
Tial knock off 35mm Wastegate
Custom IC, made from 1/3 of Power stroke IC core
Blitz SS BOV
Skunk 2 Intake Mani
Custom Traction Bars

I think I may have found out what the problem is, I found the spec sheet with the machnists writing on it in the bottom of my piston box.... if I calculate right it looks like he bored it 2.9741?? which would be 0.0046 clearance....

Here is the sheet

ComputerJLT

thats definately piston noise...

it shouldnt be that loud if you're only running .0035" clearance; i'm running nearly .006 and my srp's aren't nearly that loud when cold; by the time its warm you cant even tell the difference from a stock Z6.

ITs also not a good idea to rev on the motor like that when the pistons are cold

rpro95

Newby here I have the same exact noise as well
I have 11.5:1 compression on a newly built block
with arias pistons.I picked the car up today asked engine builder if the noise is normal he said it was due to it being a High compression motor.and that it needs tuning. ******* punk *** liar.I am so pissed I spent thousands.I thought maybe it was because of the skunk cams stg 2.

eastbay92cx

You should try and get that motor tuned asap. If this is what happened, I don't know who would send you out with an 11.5:1 motor they built for you on a stock ecu. Not so good. just my opinion

aakeobo

When the machinist mic-ed the pistons, it read 2.9706". If you add .0035" to that, the finished bore would be 2.9741". That is the reason why he bored it out that far.

For CP pistons to be off by .0011" is somewhat odd. Ive always heard that CP pistons were precise up to .0001"

You're noise is most likely to be the pistons.

legendboy

Quit being paranoid wigga your engine's fine haha

Get this thing back to the dyno so we can TURN UP THE BOOST !!!!!

ladysman

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by legendboy &raquo;</TD></TR><TR><TD CLASS="quote">Quit being paranoid wigga your engine's fine haha

Get this thing back to the dyno so we can TURN UP THE BOOST !!!!! </TD></TR></TABLE>

I agree, it sounds fine to me. It will be noisy when cold. If you don't like the noise, don't buy a big cam...

Unsivil_audio

I actually think the "diesel" noise is cool. You motor sounds fine to me. I've heard quite a few like that.

egmike

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by legendboy &raquo;</TD></TR><TR><TD CLASS="quote">Quit being paranoid wigga your engine's fine haha

Get this thing back to the dyno so we can TURN UP THE BOOST !!!!! </TD></TR></TABLE>

haha, Yeah I guess I am being a bit paranoid....lol I was out drivng it around last night on low boost and once it is nice and warm it sounds almost stock.

thanks for the replies everyone

legendboy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by egmike &raquo;</TD></TR><TR><TD CLASS="quote">thanks for the replies everyone </TD></TR></TABLE>

no thank you egmike

egmike

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

no thank you egmike </TD></TR></TABLE>

Whatever "Legend--&gt;BOY&lt;--"

EITCP

I believe 0.0035 is a bit too large for piston to wall clearance allthough it is written in instructions. I know that Wiseco have 0.0022 for D16 and 0.0028 for B16 motors. I'm wondering why people buy pistons with so large clearance? No wonder they are making noise...

Next time do it right and buy Wiseco coated and you will hear zero noise

ComputerJLT

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EITCP &raquo;</TD></TR><TR><TD CLASS="quote">I believe 0.0035 is a bit too large for piston to wall clearance allthough it is written in instructions. I know that Wiseco have 0.0022 for D16 and 0.0028 for B16 motors. I'm wondering why people buy pistons with so large clearance? No wonder they are making noise...

Next time do it right and buy Wiseco coated and you will hear zero noise </TD></TR></TABLE>

je/srp calls for 3-4 thousands clearance; i'm running 6 thou. almost 6k on my motor not a problem one

EITCP

i believe that everything more than 0.003 is too much. When i was installing SRP pistons into B16block the suggested tolerance was 0.003 so i did it this way. I believe if you do have looser tolerance than 0.003 then piston noise will occur and the walls will suffer from quicker wear. I'm wondering how long will your engine last, what oil consumption do you have and how much gasses went through the piston rings (loosing power)?

Everybody should build engines for more power and not for loosing power when loading it. Did you wonder how much of the HPs you are loosing with this looser tolerances?

This is just mine opinion, no hard offence, please.

93preludes

I agree with what EITCP says... i just fought with my machine shop over half a thou and made them return my money for not making it exact but maybe I'm just picky. I'm also building with oem pistons so the clearance I need is tighter...

why are you running .006 computerjlt?

ladysman

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

je/srp calls for 3-4 thousands clearance; i'm running 6 thou. almost 6k on my motor not a problem one</TD></TR></TABLE>

JE has a different clearance than SRP so don't assume they are the same.
Same company, yes, but they are different.