space from which the engine draws its air air cooled engines cool with air you ... you probably can figure out that cool air cools better than hot air well if you ... the cooling fan starts to run it draws air from the box a vacuum and the fan pulls ... the air into the engine shroud over the heads ... and dumps it out underneath this used air is hot the vacuum created in the box ... compartment tries to pull in fresh air from wherever it can get it usually it ... can get cool air from the fresh air intakes or if there is no seal it will pull the ... old used hot air up from under the engine and try to ... cool itself with hot air without a seal it will continue to do ... ® this makes a lot of difference in an air-cooled engine firewall seal bug dealer us `49- ... 79 #sn2709 .13.43 5 #sn1376 34.30 ...