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#598528 - Sat Dec 05 2009 07:07 PM Re: Biggest 6-Cylinder Engine? [Re: tclederman]  
crenwelge  Offline
Shop Shark
Joined: Jan 2008
Posts: 4,659
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.



#598549 - Sat Dec 05 2009 08:33 PM Re: Biggest 6-Cylinder Engine? [Re: crenwelge]  
C10 - C90 Bill  Offline
Shop Shark
Joined: Apr 2003
Posts: 876
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


'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan

#598550 - Sat Dec 05 2009 08:37 PM Re: Biggest 6-Cylinder Engine? [Re: C10 - C90 Bill]  
truckernix  Offline
Joined: Mar 2002
Posts: 8,849
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?


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!

#598874 - Mon Dec 07 2009 03:24 AM Re: Biggest 6-Cylinder Engine? [Re: truckernix]  
Freq2002  Offline
Shop Shark
Joined: Dec 2006
Posts: 1,331
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!


1956 GMC 370 dump " 'Tater "
1970 VW Volksrod "the Black Bomber"
2000 GMC Sierra
2005 Harley Davidson FLHTCUI
My webshots page

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!
:P

#598891 - Mon Dec 07 2009 04:09 AM Re: Biggest 6-Cylinder Engine? [Re: Freq2002]  
C10 - C90 Bill  Offline
Shop Shark
Joined: Apr 2003
Posts: 876
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


'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan

#598897 - Mon Dec 07 2009 04:26 AM Re: Biggest 6-Cylinder Engine? [Re: C10 - C90 Bill]  
crenwelge  Offline
Shop Shark
Joined: Jan 2008
Posts: 4,659
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.


#598906 - Mon Dec 07 2009 04:43 AM Re: Biggest 6-Cylinder Engine? [Re: C10 - C90 Bill]  
oldiron57  Offline
Shop Shark
Joined: May 2008
Posts: 242
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


1957 Chevrolet 6400 flatbed dump
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#599041 - Mon Dec 07 2009 06:57 PM Re: Biggest 6-Cylinder Engine? [Re: C10 - C90 Bill]  
peytonmaterne  Offline
Wrench Fetcher
Joined: Dec 2009
Posts: 106
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.


#599157 - Tue Dec 08 2009 01:16 AM Re: Biggest 6-Cylinder Engine? [Re: peytonmaterne]  
C10 - C90 Bill  Offline
Shop Shark
Joined: Apr 2003
Posts: 876
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


'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan

#599857 - Thu Dec 10 2009 01:58 AM Re: Biggest 6-Cylinder Engine? [Re: C10 - C90 Bill]  
55 1st suburban  Offline
Shop Shark
Joined: Aug 2005
Posts: 2,214
Rapid City, South Dakota
They make a six but this one is an eight and big! They also make a twelve cylinder.

Bruce


My Trucks
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