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#598528 - Sat Dec 05 2009 01:07 PM Re: Biggest 6-Cylinder Engine? [Re: tclederman]
crenwelge Offline
Shop Shark
Registered: Sat Jan 19 2008 01:15 AM
Posts: 4382
Loc: Fredericksburg, Texas
There is a possibility that a 707 was still available later for fire apparatus. Back in the 50's, as now fire insurance is rated by the fire equipment available. Insurance companies gave low ratings to Diesel powered equipment because it wouldn't start in cold weather in those days. They also had guidelines as far as displacement for different gpm pumpers. There was a category that required a 700 cu in engine which made the 707 Mack a popular engine for fire apparatus. The 5" bore 6" stroke Mack was a very durable work horse, but I don't think it had anything to do with GMC. It could have been that GMC still produced the 707 for fire trucks, but they really pushed the 71 series Diesels in their highway offerings because they owned Detroit.
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#598549 - Sat Dec 05 2009 02:33 PM Re: Biggest 6-Cylinder Engine? [Re: crenwelge]
C10 - C90 Bill Offline
Shop Shark
Registered: Thu Apr 10 2003 12:00 PM
Posts: 863
Loc: Moneta, VA
When I was a kid, we had a '47 to '55 1st Design style GMC fire truck at our local station house. I don't know much about badging on those old trucks, but it was either the heaviest style or one below it. It had "GENERAL" on the front of the hood. It was a gas engine and it had a very distintive sound to it. I could tell what was coming down the road before they even got the siren going. I'm wondering now if that was a 503 or possibly a 707. Anyone know of any sites with sounds of those old monsters?

Bill
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#598550 - Sat Dec 05 2009 02:37 PM Re: Biggest 6-Cylinder Engine? [Re: C10 - C90 Bill]
truckernix Offline
Registered: Sun Mar 24 2002 12:00 PM
Posts: 8305
Loc: Bracebridge Ontario Canada
I wonder what the truck in the photo, loaded as it was, would do on a flat highway. I am guessing that it would have had a governor on it, correct?
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#598874 - Sun Dec 06 2009 09:24 PM Re: Biggest 6-Cylinder Engine? [Re: truckernix]
Freq2002 Offline
Shop Shark
Registered: Wed Dec 20 2006 12:00 PM
Posts: 1330
Loc: Whidbey Island, WA
Much like the old straight 8's (a duesenberg 8 with crank mounted super charger,... *sigh*), I'd love to get ahold of a 707-6. That sounds too cool, even if it was just on a display stand it would be an interesting piece of machinery to tinker on.
Still doesn't carry the monster quality of the GMC V-12, (something else I'd love to have), but that's still a huge engine!
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I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion!
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#598891 - Sun Dec 06 2009 10:09 PM Re: Biggest 6-Cylinder Engine? [Re: Freq2002]
C10 - C90 Bill Offline
Shop Shark
Registered: Thu Apr 10 2003 12:00 PM
Posts: 863
Loc: Moneta, VA
Originally Posted By Freq2002

Still doesn't carry the monster quality of the GMC V-12, (something else I'd love to have), but that's still a huge engine!


Funny thing is, the 707-6 actually has 5 more Cubic Inches than the V-12 has. I can just imagine what a piston looks like out of a 707.

Bill
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#598897 - Sun Dec 06 2009 10:26 PM Re: Biggest 6-Cylinder Engine? [Re: C10 - C90 Bill]
crenwelge Offline
Shop Shark
Registered: Sat Jan 19 2008 01:15 AM
Posts: 4382
Loc: Fredericksburg, Texas
The pistons are not as big as you might think. When you figure displacement you multiply the radius squared times PI times the stroke. When you square the radius it gets up there in a hurry. But they were heavy. I would imagine the red line was probably around 2200 rpm.
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#598906 - Sun Dec 06 2009 10:43 PM Re: Biggest 6-Cylinder Engine? [Re: C10 - C90 Bill]
oldiron57 Offline
Shop Shark
Registered: Fri May 16 2008 09:04 PM
Posts: 242
Loc: Raleigh, North Carolina
Talk about size, the 707 is large, especially for a gas engine. It works out to be approx. 118 cubic inches per hole. Diesels, on the other hand, are often much larger. The commonly used 6 cylinder NH Cummins Diesels from the early 60's onward were 855 cubic inches, which is over 142 CID per hole. They provided horsepower ratings of 220 on up to 400 hp. (maybe more!) I've seen their pistons and they are quite massive, I still have a few NH pistons around the shop today. The Cat 3406 6 cylinders were even larger.

James
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#599041 - Mon Dec 07 2009 12:57 PM Re: Biggest 6-Cylinder Engine? [Re: C10 - C90 Bill]
peytonmaterne Offline
Wrench Fetcher
Registered: Fri Dec 04 2009 11:05 AM
Posts: 106
Loc: SE Ohio
Originally Posted By C10 - C90 Bill
When I was a kid, we had a '47 to '55 1st Design style GMC fire truck at our local station house. I don't know much about badging on those old trucks, but it was either the heaviest style or one below it. It had "GENERAL" on the front of the hood. It was a gas engine and it had a very distintive sound to it. I could tell what was coming down the road before they even got the siren going. I'm wondering now if that was a 503 or possibly a 707. Anyone know of any sites with sounds of those old monsters?

Bill

Hey Bill, I have a 54 630 series General firetruck. It has the 503. GMC had a special wheelbase chassis for the firetrucks and was marketed as such. 503, 5 speed trans and 6.50 geared rear (mine came with a detroit locker). I have searched youtube and such but with no luck, heck even finding info on the 503 is a struggle. I think the 707 might have come in an off road type truck with an extended hood like an FWD.
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#599157 - Mon Dec 07 2009 07:16 PM Re: Biggest 6-Cylinder Engine? [Re: peytonmaterne]
C10 - C90 Bill Offline
Shop Shark
Registered: Thu Apr 10 2003 12:00 PM
Posts: 863
Loc: Moneta, VA
peytonmaterne,

Sounds like you've got a nice truck.

If you ever get any pictures of it, I would like to compare it (by memory) to the firetruck we had in our neighborhood.

Bill
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'60-'72 Chev/GMC Fan
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#599857 - Wed Dec 09 2009 07:58 PM Re: Biggest 6-Cylinder Engine? [Re: C10 - C90 Bill]
55 1st suburban Offline
Shop Shark
Registered: Mon Aug 22 2005 12:00 PM
Posts: 2208
Loc: Rapid City, South Dakota
They make a six but this one is an eight and big! They also make a twelve cylinder.

Bruce
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