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 Post subject: Break-in Temperature
PostPosted: Tue Feb 27, 2018 7:31 am 
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2 BBL ''SuperSix''

Joined: Sat Mar 04, 2017 3:44 pm
Posts: 11
Car Model*: 1974 Dodge Dart Swinger
Hey Guys,

Rebuilding my first slant and I've been pouring over everything I can find on the subject. I ran across something that has me a little curious though. According to the "Slant Six Racing manual" pdf, all the scenarios specify to not let the engine go above 180 degrees during the break-in period. Now I'm not planning on racing this engine, but the stock thermostat is 180-195(summer/winter) degrees. Do I need to be worried about this? I know I can get a 160 degree thermostat but I don't see this mentioned in any other discussions on breaking one in.

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 Post subject: Re: Break-in Temperature
PostPosted: Tue Feb 27, 2018 11:42 am 
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Board Sponsor & Contributor

Joined: Thu Oct 31, 2002 5:39 pm
Posts: 23002
Location: North America
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That "Slant-6 Racing Manual" is full of fairytales (errors -- lots of them, big and small). Best close it and leave it closed except for telling stories around a campfire. There is no factual basis to this idea that the engine shouldn't go over 180° during break-in. There is also usually no basis for switching thermostat temperatures for summer/winter, and there is almost never a valid reason to use a too-cold (160°) thermostat Read this (and all four subsequent chapters).

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 Post subject: Re: Break-in Temperature
PostPosted: Tue Feb 27, 2018 3:01 pm 
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 12585
Location: Blacksburg, VA
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I have never worried about break in temp. It is always hot because you are scraping freshly roughened/machined metal surfaces together. No problems here...

Lou

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 Post subject: Re: Break-in Temperature
PostPosted: Tue Feb 27, 2018 5:58 pm 
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Joined: Tue Oct 29, 2002 8:27 pm
Posts: 9523
Location: Salem, OR
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x3

I've used 180 and 195 degree T-stats on 10-11:1 SCR motors and no problems... make sure to top up the overflow tank after it pukes then draws the coolant back
into the radiator.


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 Post subject: Re: Break-in Temperature
PostPosted: Thu Mar 01, 2018 5:54 am 
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2 BBL ''SuperSix''

Joined: Sat Mar 04, 2017 3:44 pm
Posts: 11
Car Model*: 1974 Dodge Dart Swinger
Thanks guys, I thought it seemed odd. I just wanted the assurance of the experts.

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 Post subject: Re: Break-in Temperature
PostPosted: Thu Mar 01, 2018 8:15 am 
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Supercharged
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Joined: Sat Feb 16, 2008 1:25 pm
Posts: 5341
Location: Downeast Maine
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I saw that same "keep it under 180 degrees during brake-in" bit of info in the above said book... To early here for camp fires.

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 Post subject: Re: Break-in Temperature
PostPosted: Sun Mar 18, 2018 5:26 pm 
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Turbo EFI
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Joined: Wed Nov 23, 2011 11:07 am
Posts: 1971
Location: SF Bay Area
Car Model*: 67 dart 2 door hardtop
Engine heats up pretty good during breakin, but stays within acceptable range, i.e. it doesn't boil over or anything. You can definitely feel the extra heat though...totally normal.

brian

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