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My 37 Ford would get 60 psi cranking on the original 6 volt system with a cranking speed of 100 rpm, about a third of a modern engine. I never let an engine warm up. If I had to deal with ice on the windows. I would either cover them with something, or carry a scraper.
Now if we are talking about sub 0 (farenheit) weather then I would run the engine on max defrost-recirculate while scraping the windows (all of them), or use a spray chemical deicer.
regards
mech
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