98civicEX

okay guys i need your help on this one...

75.5 arias 8.5:1 compression
D16y8 block and head milled .060
stock head gasket.
compression is fine w/ 200 across the board. valve adjustment and clearnaces checked two times, it's to spec.

the car started great, no codes. did two 0-50mph runs . and began test driving around for about 5 miles keeping it under 3500rpms. Car was running for about 30 minutes (this includes idle time) The piston slap is still unbeliveable. I know the motor was bored to spec. The installation of everything was also done to spec. Everything was done very cautious and was done the correct way, and checked over many times. What's the deal w/ the piston slap? I'm not sure if i should continue the break in process w/ all the piston slap i'm hearing.

Wanted to jump in and say, this isn't my set-up or block, it's one of my close firends...too many people askin why i went this route


[Modified by 98civicEX, 10:48 PM 11/4/2002]


[Modified by 98civicEX, 6:36 PM 11/7/2002]

Flamenco-T

what was your pistons skirt to cylinder walls clearance ? most of aftermarket pistons due to silicone contents ahve anywhere from .003 to .004 of clearance

and where did you measure the clearance, how far down the cylinder wall ?

stan

PyroVTEC

Mine sound pretty bad when cold. But when warmed up, most of the sound goes away. I was reading a rather long post about motor oil in the ITR forum; there may be an association between using Mobil 1 and piston slap, whereas some users found that the use of Redline synthetic (10W-30 to be exact) seems to minimize piston slap. I'm going to try that next myself.

BTW, I'm running 75.00mm SRP 9:1 pistons w/ JE rings.

ninesecrx

Sure its not a rod knocking? Maybe at bad wrist pin? When its running, pull a plug wire one by one and see if the noise goes away.

VaporTrail

pretty typical of Arias from my experience. Did you have it match bored, or just give the machine shop one piston? I've found over the years that most pistons, even OEM replacements from the dealer, vary a lot from piston to piston - Wiseco being the exception to that. Arias pistons I've seen exhibit a lot of piston slap, especially when cold. Match boring (boring and honing each piston to each cylinder) is one way of minimizing this...

ninesecrx

But he said the car was running for 30 minutes...which its not Arias warming up at that point. They are a little noisey warming up...but it goes away and its not super load. Questions like these are too hard because your not there to hear it.

98civicEX

i'm going to jump back on it...the block was checked by the shop. It was assembeled at my house, but was told the clearence was 0.003, which is in spec. I'm going to try pulling the plugs to get a better grasp of what's going on. BTW the bearings were all put on w/ plasticgauge (sp*). When we drain the oil, it was clean. No metal shavings.

earl

If it didn't knock when you first started it but after a half an hour of running it has started knocking, there IS something wrong. The piston slap noise should go away after 30 seconds of running, not get worse. Look at everything. Rod bearings, oil pressure changes, piston diameter, pin slop, bores going out of round, etc. Something is happening and it's not right.

earl

BTW, .060 is quite a bit to have milled the head. How is your piston to valve clearance? The longer you run it making that much noise, the more you are hurting it.

98civicEX

Earl, and everyone who has contribueted...thanks so much...it looks like the rebuild just turned into a disassemble.

*Boostwerks*

I agree.

fire7882

I'm somewhat a newbie so forgive me if i'm way off, but could the noise be the valves hitting the pistons with the .060 milled head or are these noises totaly different.

98civicEX

it's not the valves, and it's not the pins...i just talked to my buddy who helped w/ the install. it's definetly piston slap. the rings still haven't seated and smoke will completely cover all cars when we follow the car. it looks like it'll have to be bored to 75.75. you guys think stock sleeves can handle that size bore?

Sonny

If you bore it larger, the slap will get worse! It almost sounds as if the clearance is too loose already. Let us know what you find.

Sonny

earl

Just make sure you know SPECIFICALLY what went wrong otherwise you will make the same mistake. Don't make plans until you know for sure after the tear down. 75.75mm may be on the edge for a D series. Not sure on that however.

ekb18c

0.06 is way too much IMO. Where did you check the clearance? On Arias you have to check the clearance at the very bottom of the skirt, NOT the middle of the piston.

edit- stock sleeves should only be bored out 20 over at most.


[Modified by ekb18c, 12:18 AM 11/5/2002]

earl

I don't think he said anything about .06 piston to wall clearance. He did say the head was milled .06 which on V-8 is no big deal but on an import, that's huge.

acuratech

Hey guys, thanks for these posts, i am the guy that helped build this headache. Anyway, this motor is screwed no doubt about it. i kinda had a bad feeling, but was told by machine shop that the piston to wall clearance was ok. We took the whole block back to the machine shop before we installed the head. The only thing that i can come up with is the guy that bored it builds alot of v8 motors. Maybe he was expecting more swelling of the pistons as they warm up? But this is definitely overbore. Thx guys...

Loco Honkey

Pistons in backwards? If not, what Earl said.

98civicEX

honda says you can get 75.5 out of stock sleeves w/ no problem.

earl

Was that with a turbocharger?

98civicEX

no i didn't so it looks like you have a damn good point on that one.

Update: talked to machine shop...everything was bored to the exact spec. Once we pull, we'll be rechecking...then after that it's time to call arias.

TurbodCX

98civicEX,

my car is the same way and has been for 1 year now.... just watch a temp gauge mine is noisy as ****, and it doesnt stop until i hit 150-165F, so before you go and tear it all apart just wait and try that.... arias are know to be very noisy..
Brian

acuratech

TurboedCX, this car hits full temperature and still is noisy, doesnt quiet off any. Its a major bitch. But we know what has to be done, its just a matter of getting back on it, thx for your post

earl

Make them show you the spec on the pistons and bore size and then have them check them again in front of you.