Author Topic: Stock Piston Question  (Read 204 times)

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Offline Scoobum

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Stock Piston Question
« on: May 08 2018, 08:01:22 PM »
Is there any copper in the stock pistons?
109 STD Bore Short Block-Balanced Rotating Assembly
Stock Crank
Stock Pistons
Stock Rods
Stock Timing Chain/Gears
212/212 Flat Tappet Cam
JB Racing Heads
Stock Rockers
5.7 TT Race Chip
Built 2004R
AC 16930
6262 JB

6.72 at 104.67-25 PSI

Offline good2win22

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Re: Stock Piston Question
« Reply #1 on: May 09 2018, 08:49:11 AM »
Not that I know of. You got copper in the pan?  Better pull rod and main caps and have a look at the bearings
Jason

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Offline Scoobum

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Re: Stock Piston Question
« Reply #2 on: May 09 2018, 09:38:43 PM »
Not that I know of. You got copper in the pan?  Better pull rod and main caps and have a look at the bearings

Bearings are mint...zero detonation...S coob knows how to tune. There's copper in those pistons. I wore 'em down far enuf to prove it. Cross hatch marks are still on the cylinder walls. Between Dan and I we have several sets of stock pistons on rods. If we can put together one good set at Joes on Saturday in Montreal...don't be surprised to see us throw rings and bearings in it with the same cam/lifters and keep going.

This engine has about 500 eighth mile passes on between 6.8 to 7.2. Stock bore and pistons. I had Joe install rings and bearings and balance it...that's it.



« Last Edit: May 09 2018, 10:10:41 PM by Scoobum »
109 STD Bore Short Block-Balanced Rotating Assembly
Stock Crank
Stock Pistons
Stock Rods
Stock Timing Chain/Gears
212/212 Flat Tappet Cam
JB Racing Heads
Stock Rockers
5.7 TT Race Chip
Built 2004R
AC 16930
6262 JB

6.72 at 104.67-25 PSI

Offline Steve Wood

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Re: Stock Piston Question
« Reply #3 on: May 10 2018, 10:20:22 AM »
The stock piston is cast aluminum with an iron reinforcement. ..like a diesel piston somewhat.  I wonder if there is some copper in the pin bush?
Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline Scoobum

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Re: Stock Piston Question
« Reply #4 on: May 10 2018, 07:16:03 PM »
The stock piston is cast aluminum with an iron reinforcement. ..like a diesel piston somewhat.  I wonder if there is some copper in the pin bush?

Steve...betwee n the compression rings and the oil rings I'm seeing copper. Will send you a pic next week.
109 STD Bore Short Block-Balanced Rotating Assembly
Stock Crank
Stock Pistons
Stock Rods
Stock Timing Chain/Gears
212/212 Flat Tappet Cam
JB Racing Heads
Stock Rockers
5.7 TT Race Chip
Built 2004R
AC 16930
6262 JB

6.72 at 104.67-25 PSI


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