Connecting Rod side clearance: Measurement and Machining

Mike T

Well-Known Member
May 3, 2013
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Great video Dave! I really like your neat and organized shop. When I measured my K1 rods they were 005-008 so I thought that was close enough. What would be the down side to being tight like mine ?

Thanks
Mike
 
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turbodave231

Moderator
May 24, 2001
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Mike,

Thanks for the compliments on the shop.....its not always this clean and organized when things get rolling!! The downsides to too tight? Galling against the crank would be the downside, but I've never run into that failure before. I would think you're OK at the .008".
I have seen and assembled engines with more than .020" on plenty of stock rod engines.
 

v6turbo87

Active Member
Mar 27, 2014
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Buick power source book says .008 - .010 for stock rods.

Posted from the TurboBuick.Com mobile app
 

v6turbo87

Active Member
Mar 27, 2014
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.....and great video thanks for posting it

Posted from the TurboBuick.Com mobile app
 

Ttype6

Well-Known Member
Aug 17, 2004
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Flint,Michigan
My experience with Molnar rods,on the engine I'm currently building,has been the same. I found .005" to .006" side clearance.
 
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SS/GN

Well-Known Member
Jun 30, 2005
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Dave thanks for sharing, people like you are what set these cars aside from other makes.:cool:
 

Thunder

Wanna-be 10 sec'r
May 25, 2001
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Great video Dave!! Thanks for taking the time to share. For a guy who has yet to get that far into my motor, I love to see how some of it comes together. Very much appreciated!
 

GNONYX

Well-Known Member
Oct 16, 2009
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Very informative video Dave
Wish I had the room in my two car garage to put that kind of machinery; but then again if I had the room Dave, you would need to make more video.(y)
 

ek02

Well-Known Member
Jan 31, 2008
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I have one engine with an old set of CAT rods and CAT crank that has .018 side clearance. Noisy as hell until it gets good and hot and the side clearance gets tighter. Another engine with Molnar rods and an RPM crank that is too tight at .006, which is the minimum spec for stock rods. .010-.011 seems to be the perfect clearance.
 
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DailyDriverPerf

formally REDS HOT AIR
Nov 30, 2009
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Newport News, Virginia
stock are way too loose.

great video Turbo Dave goes to show the time it takes to do things the right way .

another downside to being loose on a off center engine is the more it slaps side to side the more the piston cocks over in the bore losing ring seal and causing uneven loading on the rod bearing
 

markc9826

New Member
Jan 3, 2017
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Hi Dave,
I am new to tap talk, I don't feel real adept with navigating, for fear I'll not notice or otherwise displace an intended communication channel.
To that end, Please consider contacting me, via my email to follow, I have many questions, which in the scope of this writing, remain to much.
My email: drmarkclemente@gmail.com
Thank you and I look forward to speaking with you.

Sincerely,
Mark


Sent from my iPhone using Tapatalk
 

MCH86GN

Well-Known Member
Aug 20, 2008
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Dave had more videos on youtube. Search turbodave231. Great guy. He help me a lot this past summer. See sig.
 
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