When you don't trust your local engine shops..
Moderator: Team
Re: When you don't trust your local engine shops..
If i owned a hemi the last thing i would want in that engine is a stock rod. With the combo of bad forgings, machining, and weight differences of over 50 grams in a single set, anything aftermarket is light-years ahead in quality.
Re: When you don't trust your local engine shops..
He still has the original rods plus two other sets of new rods. He might be changing his mind and looking at a new larger cube short block or another complete engine and keeping the original stored.
We will see as he just retired and has some money to play with.
We will see as he just retired and has some money to play with.
Re: When you don't trust your local engine shops..
Im not a crysler guy , but this is intriguing, why would they do that?MotionMachine wrote: ↑Thu Sep 20, 2018 5:11 pm This is my Mickey Mouse drawing of the issue I was trying to describe earlier. not sure if it'll even attach. The parting line angle is greatly exaggerated to show how grinding the rods perpendicular to the sides of the rod and cap will cause misalignment.
rod drawing.pdf
Tom
-
- Guru
- Posts: 1564
- Joined: Thu Sep 16, 2010 10:01 am
- Location: Virginia
- Contact:
Re: When you don't trust your local engine shops..
I'm sure it's not on purpose. It's not a problem until the rod needs to be reconn'd.zums wrote: ↑Thu Sep 20, 2018 7:45 pmIm not a crysler guy , but this is intriguing, why would they do that?MotionMachine wrote: ↑Thu Sep 20, 2018 5:11 pm This is my Mickey Mouse drawing of the issue I was trying to describe earlier. not sure if it'll even attach. The parting line angle is greatly exaggerated to show how grinding the rods perpendicular to the sides of the rod and cap will cause misalignment.
rod drawing.pdf
Tom
"do it right or do it right away"
http://www.motionmachineinc.com/
https://www.youtube.com/watch?v=ZgIZbveknDs
http://www.motionmachineinc.com/
https://www.youtube.com/watch?v=ZgIZbveknDs
Re: When you don't trust your local engine shops..
OP: I can relate to his anxiety, but I too think he's going overboard.
My previous two engines- One "circle track specialist" machine shop bumped a BBC crank over onto my brand new aftermarket cylinder heads, cracking the valve cover rail (and denied it). I had to buy another.
The other (recently) bored a 2.3 Lima block .030...when I asked for .020.
Tell him to find a competent machinist and stick with him- they are out there.
Dan Dutton Machine in Alexandria, AL
Tom @ Competition Engines in Bessemer, AL.
My previous two engines- One "circle track specialist" machine shop bumped a BBC crank over onto my brand new aftermarket cylinder heads, cracking the valve cover rail (and denied it). I had to buy another.
The other (recently) bored a 2.3 Lima block .030...when I asked for .020.
Tell him to find a competent machinist and stick with him- they are out there.
Dan Dutton Machine in Alexandria, AL
Tom @ Competition Engines in Bessemer, AL.
He who is in me is greater than he who is in the world.
Re: When you don't trust your local engine shops..
[/quote]
Im not a crysler guy , but this is intriguing, why would they do that?
Tom
[/quote]
Because it's a Chrysler...why else.
Im not a crysler guy , but this is intriguing, why would they do that?
Tom
[/quote]
Because it's a Chrysler...why else.
-
- Guru
- Posts: 1746
- Joined: Tue Jan 15, 2013 8:10 pm
- Location:
Re: When you don't trust your local engine shops..
Agreed, it was most likely a mistake, or possibly compensating for some error somewhere else, since it seemed to happen more than once, and to just a couple of manufacturers. Although, the severity of the angle was surprising.
After finding the first one or to rods, we figured out how to put a shim between the upper edge of the cap/rod and the fixed jaw of the Sunnen cap grinder until it was cutting parallel to the OEM rod machined surface,
==============.===========
After finding the first one or to rods, we figured out how to put a shim between the upper edge of the cap/rod and the fixed jaw of the Sunnen cap grinder until it was cutting parallel to the OEM rod machined surface,
==============.===========
MotionMachine wrote: ↑Thu Sep 20, 2018 10:09 pmI'm sure it's not on purpose. It's not a problem until the rod needs to be reconn'd.zums wrote: ↑Thu Sep 20, 2018 7:45 pmIm not a crysler guy , but this is intriguing, why would they do that?MotionMachine wrote: ↑Thu Sep 20, 2018 5:11 pm This is my Mickey Mouse drawing of the issue I was trying to describe earlier. not sure if it'll even attach. The parting line angle is greatly exaggerated to show how grinding the rods perpendicular to the sides of the rod and cap will cause misalignment.
rod drawing.pdf
Tom
Re: When you don't trust your local engine shops..
Think about a brand new rebuilt engine that on fire-up, you find out that it swallowed a small nut down the carb!!
Can you say, "sabotage"??
I was going to have my good -781 BBC heads done and when I talked to the guy running the shop, he said that, "It was going to take a long time and cost a lot of money!..
So I bought a pair of new cast-iron Merlin ovals from Summit instead!
pdq67
Can you say, "sabotage"??
I was going to have my good -781 BBC heads done and when I talked to the guy running the shop, he said that, "It was going to take a long time and cost a lot of money!..
So I bought a pair of new cast-iron Merlin ovals from Summit instead!
pdq67
Re: When you don't trust your local engine shops..
Worn out tooling? Seen a few SBC cam tunnels bored at an angle... mass production.zums wrote: ↑Thu Sep 20, 2018 7:45 pmIm not a crysler guy , but this is intriguing, why would they do that?MotionMachine wrote: ↑Thu Sep 20, 2018 5:11 pm This is my Mickey Mouse drawing of the issue I was trying to describe earlier. not sure if it'll even attach. The parting line angle is greatly exaggerated to show how grinding the rods perpendicular to the sides of the rod and cap will cause misalignment.
rod drawing.pdf
Tom
Honored to be a member of the Luxemburg Speedway Hall of Fame Class of 2019
Re: When you don't trust your local engine shops..
*Sarcasm here*....lol.
The angled parting surface was no mistake, the superior chrysler engineering designed that into the holy grail Hemi engine so that when you torque the rods it increases the side bite on the rod bolts to survive the 9000 rpm blasts. On a serious note it has to be pretty decent old stuff to keep those heavy components inside the block at high rpm.
The angled parting surface was no mistake, the superior chrysler engineering designed that into the holy grail Hemi engine so that when you torque the rods it increases the side bite on the rod bolts to survive the 9000 rpm blasts. On a serious note it has to be pretty decent old stuff to keep those heavy components inside the block at high rpm.