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Naturally aspirated Detroit Diesels Patrick Bennett 4-19-07  
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"?
Re: naturally aspirated Detroit Diesels Tom Smet 4-20-07  
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.
Re: naturally aspirated Detroit Diesels Patrick Bennett 4-20-07  
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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