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THE NEW CADILLAC

SWAMPHUNTER45

Well-known member
GM FINALLY LET CADILLAC BUILD AN ENGINE AGAIN


Throughout the history of General Motors the different brands had always competed to build the best or most powerful products. There was competition and some of the best engineers were at Cadillac. Since the 1980s for cost savings the Chevrolet platform has been adopted as a generic power plant for GM divisions.

Well Cadillac has gotten it's balls back! They are building a dual cam, twin turbo, small displacement V8 much like an ECOTEC on steroids!

Maybe I wont need that LS platform after my old 472 / 500 parts dry up after all...lol



https://www.yahoo.com/tech/why-gm-finally-let-cadillac-143700840.html
 
:rebel:

1970-cadillac-eldorado-500-v8-engine-rebuilding.jpg


1526320902186.jpg
 
The Ford Coyote did overhead cams because those flat plane crank engines are made to spin big time RPM, all good goals and cool design for the purpose, but a totally different animal. Throw in the fact that Ford is pretty much bailing out of the car market, other than the Mustang and they ain't playing in the car market anymore. Chevy is the same, no V8 RWD other than the Camaro. Both cool cars for a 25 year old, but my sore back ain't going far in one of those pony cars. The big block Olds is definitely cool, but kind of irrelevant here, go get one, and don't start putting up links to Pontiac stuff from the 60's...

Other than European imports, the only options for a nice comfy, big a$$ 4D, V8 RWD car with a trunk to travel is Caddy or Dodge/Chrysler. It's a hell of a state of affairs in my opinion, I like my big truck, but I gotta have a go fast comfort cruiser too. I can't believe that American manufacturers have given up on the classic American 4D boat/car and let the Euro Trash take over. I guess that is why they sell so many 1/2 ton pickups with BS 2.7 liter motors that hunt for gear all day.

Back to the Cadillac motor thread, the article notes that the purpose of the overhead cams is to improve valve duration while minimizing overlap, key elements of low end torque. Throw in variable valve timing etc and the result is the following details that caught my eye:

The 4.2L will put out 500 hp and 553 lb-ft. of torque on the regular CT6, and 550 hp and 627 lb-ft. of torque for the top-of-the-line CT6 V-Sport.

Ninety percent of the 4.2L's torque is available from 2,000 to 5,200 RPM.

So in either form, the engine can be tuned to make in excess of 627*90% = 564 ft-lbf between 2000-3000 RPM. For the folks that can only think in Hp, that's 300 Hp at 2,800 RPM. I will hazard a guess that 750 ft-lbf, 400 Hp at 2,800 rpm in a direct drive application is probably not out of the question. So eliminate the weight, prop spacing and power loss of a gear box and this looks like a great potential direct drive power plant.

The wife's car is 12 years, 200K miles old, costing nothing but gas and oil to run for now, but its close to time for a new car, before I spend all my time wrenching on it vs. my toys. It's gonna be hard to pry her fingers off the wheel of the hopped up hemi, she ain't getting no "Smart Car". Those caddy specs should do it, a big fat 4 door V-Sport bimmer smoker is always fun.

It looks like I have time to work the plan. Somewhere around 2030 I will be pulling the caddy motor to go in my 86 hull. So that's the time frame for the sled build for swap over of my '64 O-540 motor.

Just got to figure out what to do with the Hemi after I pry it from the missus. She has been complaining that it needs new rear tires, I agree, they don't hook up until well past legal speed in 2nd any more. She was out of town for 3 weeks and those tires lost a bunch of tread just sitting in the drive way :bom: Always wanted to put some drag slicks on and take it to Moroso.
 
Well at least you are coming to your senses and realizing that carmotors have far more potential than A/C motors. :stirpot:
 
But if he direct drives a turbo car motor it is a big mistake... torque is useless without RPM... the prop needs shaft horsepower to convert to thrust.
 
It appears that they have built that new engine to bring the torque!

Chevrolet to follow soon with DOHC in a revised LT platform.
 
Torque is nothing but a cylinder pressure... running a motor in the peak Tq regime especially on a turbo will shorten life substantially. Gotta roll it over and let the motor make HP

Just like in a truck... reach down(in this case your pocket for gearbox cash), grab a deeper gear, and put the power down. Spin it up!

Why would you leave 100hp+ on the table not to be used... that's ~250lbs of thrust... that will make a ~600lb boat break free... all quick math and we know it ain't a perfect world.
 
kwanjangnihm said:
torque.PNG


Oh man that pic is really great! :toothy7:

Funny to see the light bulb go off on people when they realize how much power a forced induction engine makes at low rpm when setup properly.

This has been the case for 60+ years. It's just becoming main stream.

Good for everyone that major manufacturers are finally making these engines because they can make them reliable at the same time.

Until batteries come down in weight and cost, this type of engine architecture will produce the best possible power curve for airboat use.
 
Amen Russ! But they gotta spin em up to get the power to the prop. Lugging is extremely detrimental on Forced Induction motors vs NA.
 
CarMotorBarge said:
Well at least you are coming to your senses and realizing that carmotors have far more potential than A/C motors. :stirpot:
You guys are too easy to spin up :toothy7: (that's a pun in itself). I'm not a politician, so over half of what I say might be true. This is the internet, so it's up to you to weed through the crap.

Twin turbos, 5,000 PSI direct inject fuel pump, blah blah blah. That 4.2 all in with radiator etc. should come in close to a 540 on weight. Given the Torque specs it competes head to head on direct drive. Go to a gear box and I need a wider boat and big prop to keep from flipping right over, so the added weight eats up a good chunk of the thrust advantage. Regardless, the 4.2 has the performance figures to make a great airboat motor, with or without a gear box.

But no way that motor spins a prop for as long as I have been alive like an AV motor. There are a ton of turbo diesels that top out at 3,000 RPM, so high cylinder pressure motors are not out of the norm, it's all a function of what the motor is made for. The only limitation of the AV platform is heat transfer/temp, it ain't crank/piston bearing load! What makes more sense in the woods, a 50 wire bundle with 20 sensors or a hot wire and a few grounds?? Always said I'd rather be stuck than broke down.

I'm still thinkin Caddy though, put a tow hitch on her and she should drag the AB like a rocket, it's the stoppin part where the F250 shines. Still, 2030 I should have something for sale :violent1:
:rebel:

Happy Slidin.
 
The old junk yard Branch stroker loves to push low. Over 200 hours on it, nitrous, 4 S blades, broken oil pick up tube and just turn the key and go. At 150 hours an inspection was done and nearly no wear observed. Thought about putting a ProCharger on it but reading the concerns will probably pass.




Other than the HongKong Phoey distributor coming apart it has never stumbled. This new platform the 4.2 looks interesting for sure and if it were me I would mate it to a 2.37 drive and explore cracking the ECM and upping the boost slightly. At least do some limited testing because normally the factory is conservative.

I though this would bring the EcoTech guys into the Cadillac family since it's everything people have asked for in a platform. Light weight, low rpm torque, horse power up top, fuel efficient injection, runs on pump gas and is American made muscle.
 
The 2.0 LTG was designed by GM for the Cadillac ATS originally. Some Ecotec boats are running that motor. Some of us have chosen the LHU which is the LTG predecessor found in the Buicks. Bone stock factory tune these motors make ~270hp. Tuned they can push ~400-450 stock internals. Go fully forged and a slightly bigger wheel and 500-550 is easily achieved. Run E85 and you can push em to 600hp+...

Ecotecs are about v8 power in a lightweight i4 package. No need for a 4.2TT unless you wanna role at 800hp+ after you fix what GM decided to build cheap inside that motor

I'm currently at 200hp on my 1.4 LUV. I can put it at 250hp with a turbo swap on stock internals.
 
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