Tap Tap Tap??

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Nov 19, 2008 | 09:03 PM

Pro52R

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From: Jax, FLA

Tap Tap Tap??

I have NO idea where its coming from. Bottom end or top...

The engine has 100K on it (short block)

I replaced the timing chain,oil pump,cam,push rods, (lifters from a 50K mile car)

I get a lil piston slap on a cold start up, but then I get this tap tap tap noise.

It is noticeable at idle,but with some RPM's it seems to quiet down. (could be due to the open y-pipe)

I am showing 60psi w/ 15w40 Castrol Tection diesel oil.

Would a bad lifter or bearing get quieter with more engine speed?

I just really can't tell where its coming from..I guess I need to break out the pvc pipe

Nov 19, 2008 | 09:06 PM

Gregorya24

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From: Charleston, SC

why would you put diesel oil in your car?

Nov 19, 2008 | 09:35 PM

Pro52R

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From: Jax, FLA

it free....and i just wanted to run it for the initial start up.

Besides..its no different....just thicker...people been running it for years

Nov 20, 2008 | 09:24 AM

fortmyerspolice

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From: Fort Myers FL

Sounds like the average LS1 noise.

Nov 20, 2008 | 09:29 AM

adriangarcia404

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From: Brownsville, texas

i have piston slap also.=(

Nov 20, 2008 | 09:46 AM

novaflash2002

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From: Billings, Mt

pison noise, preaty common in ls1s

Nov 20, 2008 | 12:42 PM

Pro52R

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From: Jax, FLA

the piston slap goes away...then I get the tap tap tap....and like i said, it goes away when i rev it

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Nov 20, 2008 | 10:37 PM

novaflash2002

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From: Billings, Mt

i know i have a ls1 that i have put a mechanic stethiscope on, and it keeps tapping on no 7 cylender. pistons can shrink with time. my dad is a machinist and has been building engines since the early 60's can confirm. im taking over his legacy, some people think im joking when i say pistons shrink, but i have seen it happen alote.