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> At what displacement are external coolers needed?, Building an alternative engine for my six
Speedo
post Aug 12 2019, 02:24 PM
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I have read that the general consensus is above 180 hp an external cooler is needed.
I am at a crossroads with the 2.2 T I am building. I have 2.2 S pistons and cylinders and and cams. If I stroke it I get a higher cr 2.4 S. If I don't stroke it I get a decent 2.2 S which would still be a nice choice. I have everything I need for the 2.2, but if I stroke it I will need to source a 70.4 crank. Curious what the board thinks about the "red line in the sand" for needing cooling. It goes without saying that I am not interested in cutting on the six for a cooler up front.
Having said that...I spoke with a friend over the weekend with a 76 911 with a 3.2 transplant that doesn't run a cooler. He says his temps never go over 210...which I question as I have a stock 74 2.7 with a modified pulley setup that runs 200 but will show 230 when pushed. I think I need to measure his temps with a pyrometer to double check his temp gauge. (IMG:style_emoticons/default/bs.gif)
Tell me what you guys think! (IMG:style_emoticons/default/idea.gif)
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gereed75
post Aug 12 2019, 05:48 PM
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I have no direct personal experience, but the bigger difference in a 2.4 will be more torque. That will make the 2.2 no less fun, and the rev characteristics of the short stroke are sublime.

Take a look at my thread on the under trunk oil cooler. http://www.914world.com/bbs2/index.php?sho...=314444&hl= My objective also was no cutting on my six. I made a bracket that mounts the whole cooler and fan off of the trans mount plus one additional bolt off of the sway bar mount. That part all worked great.

It is all Still mounted under the car, minus the plumbing. All back to stock due to an oil cooler leak because I did not include a bypass for low temps/high oil pressures. Got it 95% right! Running now with more conservative timing and no more track days (BTDT) and all temps seem well.

I think it I felt compelled to do it again, with the same objective of not cutting the six, I would use the ever contentious under the engine lid idea, or re- plumb mine with a bypass.

If interested, drop me a line, all hardware could be yours for a very reasonable number. I’ll throw in the 100’s of engineering and fabrication hours for free.
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