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I've read on some marine forums about naturally aspirated Detroit Diesels.
However, the 1966 GMC 4107 bus I am considering buying is normally aspirated. I thought that ALL 4107 buses came with a blower. I know that compression ratios,etc., are different between blown and unblown engines. How can I tell if this engine has been "bubba'd"?
In the marine industry when someone is talking about Natural aspirated engine they are talking about an engine with only a super charger. All GM "two stroke" diesels have to have at least a blower. You could have a 6-71N engine which is a 6 cylinder, 71 cubic inch per cylinder Natural aspirated engine. Same goes for something like a 8V92TA which is 8 cylinder, V style Block, 92 cubic inches per cylinder, Turbo Charged After Cooled. This engine would still have a supercharger so that it could run at an idle. The turbo charger would only be able to assist with forcing air into the cylinders when the RPMs are up.
Thanks Tom,
Great explanation; it turned the light bulb on.
The gentleman selling me the bus told me it doesn't have a supercharger, so either he is mistaken, or I'd better not buy the bus.
To be honest, prior to my interest in this bus, I did not even realize that Detroit Diesels were two-cycle. Thanks again.
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