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hows this for an engine v12 702 2 carburators
- Thread starter brian wafer
- Start date
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y5mgisi
1 ton status
Yep those things are pretty neat.
must not off made a lot off them. an old guy already told us that a fleet he drove for had a gas v 12,didn,t really belive him! found that picture in a maintance manual for models 5500-9000. wonder what kind of horse power and torque they had stock? couldn,t off turned 5000rpm in stock form!
I saw one of those "Twin-Six" GMC engines at a swap meet for sale last summer--it came from a fire truck...very impressive engine!..must weigh 1500 lbs though...you'd definately be king of the rat rod crowd if you had that under your hood (if it had a hood!)..They made those engines by simply butting two 1960's 351 GMC V-6 engines crank to crank--I could not tell if it was a one peice V-12 crank or two V6 ones joined together in the engine I saw,it looks like one V-12 crank to me...Bet they had awesome low end torque..
It's one big block, one big crank, 4 cylinder heads. Great info here:
http://www.6066gmcguy.org/v12myths.htm
http://www.6066gmcguy.org/TwinSix.htm
1485 lbs...
http://www.6066gmcguy.org/v12myths.htm
http://www.6066gmcguy.org/TwinSix.htm
1485 lbs...
y5mgisi
1 ton status
From those articles,
...we can rebuild it...we can make it better, stronger, faster...
wonder what it would do with decent heads & manifold, exhaust, and a modern MPFI....
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from Thunder V12 engines...linky
Also shown are the custom twin Demon 500cfm carbs that have been calibrated by Barry Grant to work with our custom cut Hotrod Cam profiles and higher compression ratio. This cam, carb and compression combination change the nature of the engine from a slow revving industrial engine to a free revving hotrod engine providing a peak torque curve between 2,000 and 3,000 rpm and peak horsepower at a very usable 4,200 rpm.
Valvetrain modifications are required anytime an engines RPM range is doubled. The heads on a ThunderV12 engine have custom valve springs, retainers and locks to assure trouble free operation.
ThunderV12, LLC has contracted with ARP for custom fasteners to allow these big engines to survive at the RPM's a hot-rodder expects. Rods are resized and checked for straightness and dimension.
A custom oil system bumps oil pressure from 35psi at 2,400 rpm stock to 60-70psi at 4,500 rpm.
The photos also show the stock V12 distributor has been tossed in favor of a modern crank triggered/coil pack ignition setup. This unit provides dials for timing adjustments as well as a dial rev limiter. We have used the services of a dyno to verify carb tuning and to nail down the ignition timing requirements. Our dyno runs were made up to 5,000 rpm and we consider that speed an absolute redline.
I think I just made an addition to my Lotto toy list
Also shown are the custom twin Demon 500cfm carbs that have been calibrated by Barry Grant to work with our custom cut Hotrod Cam profiles and higher compression ratio. This cam, carb and compression combination change the nature of the engine from a slow revving industrial engine to a free revving hotrod engine providing a peak torque curve between 2,000 and 3,000 rpm and peak horsepower at a very usable 4,200 rpm.
Valvetrain modifications are required anytime an engines RPM range is doubled. The heads on a ThunderV12 engine have custom valve springs, retainers and locks to assure trouble free operation.
ThunderV12, LLC has contracted with ARP for custom fasteners to allow these big engines to survive at the RPM's a hot-rodder expects. Rods are resized and checked for straightness and dimension.
A custom oil system bumps oil pressure from 35psi at 2,400 rpm stock to 60-70psi at 4,500 rpm.
The photos also show the stock V12 distributor has been tossed in favor of a modern crank triggered/coil pack ignition setup. This unit provides dials for timing adjustments as well as a dial rev limiter. We have used the services of a dyno to verify carb tuning and to nail down the ignition timing requirements. Our dyno runs were made up to 5,000 rpm and we consider that speed an absolute redline.
I think I just made an addition to my Lotto toy list
bronc3buster842001
1/2 ton status
Whats the gas mileage like for one of these. Sounds like a new tow rig.
Ned Kelly
1/2 ton status
Here's a 5mpg V12 1800cid (29L for you metric folks) engine that Jay Leno drives. 190" wheelbase. Watch the video for some interesting info like 910hp, 1600ft/lbs torque, air cooled, Stromberg carbs, pump gas, Rockwell rear end, etc.
http://www.amcarguide.com/custom/jay-lenos-tank-car-blastolene-special/
Also, Seagrave V12 engines from late 1930's and up firetrucks are neat.
http://www.amcarguide.com/custom/jay-lenos-tank-car-blastolene-special/
Also, Seagrave V12 engines from late 1930's and up firetrucks are neat.
Wow,I think thats the coolest truck I have ever seen yet!..I bet it can roast those tires endlessly...I was pretty close on my weight estimate huh??..
.......................................We used to have a 1941 Seagrave fire truck with a V-12 at the junkyard--it ran when it was brought in,but then it sat 10+ years before I ever saw it..our boss said it sounded awesome..............................................................................--we tried many times to get it to run--it had twin distributors,24 spark plugs (dual ignition,2 plugs per cylinder),and we never did figure out the firing order--the last guy who tried fooling with it tried to start it and it spun over a long time firing out of order,and it blew the oil filler cap off like a shotgun,never to be seen again,and the dipstick came back to earth about 20 seconds later!..we let it sit after that,then a swarm of nasty bald faced wasps took up residence in it,so we didn't go near it any more!--a guy from Boston bought the truck just before the yard closed up and was crushed out...I always wondered if he ever put it in a rat rod like he planned,or got it to run again...
.......................................We used to have a 1941 Seagrave fire truck with a V-12 at the junkyard--it ran when it was brought in,but then it sat 10+ years before I ever saw it..our boss said it sounded awesome..............................................................................--we tried many times to get it to run--it had twin distributors,24 spark plugs (dual ignition,2 plugs per cylinder),and we never did figure out the firing order--the last guy who tried fooling with it tried to start it and it spun over a long time firing out of order,and it blew the oil filler cap off like a shotgun,never to be seen again,and the dipstick came back to earth about 20 seconds later!..we let it sit after that,then a swarm of nasty bald faced wasps took up residence in it,so we didn't go near it any more!--a guy from Boston bought the truck just before the yard closed up and was crushed out...I always wondered if he ever put it in a rat rod like he planned,or got it to run again...Latest Posts
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