Would A New Hemi Fit A P15?

[YukonJack]

With all the late model Hemi Chargers, 300's and Challengers finding their way into the wrecking yards, I was wondering how one of these engines would fit in my 47. I'm sure other people have thought about this. Anyone ever measured to see if it would fit? What about the electrical and the computer. I know someone on here is doing a V6 swap in a later model but don't remember who. I think the car Hemis run on 4-6-8 cylinders depending on demand and the truck engines run on 8 all the time. Would this make the truck Hemi an easier swap?

[Frank Elder]

Jack, this is not your answer but, one of our members has an old 392 hemi in his desoto, bigger engine compartment of course....but anything can fit if you want it to.

I'm guessing the new hemis aren't much bigger than a 318 and you have room for that.

Good luck!

[michael.warshaw]

my stereo guy has a older charger with a brand new crate hemi.

[faucet47custom]

I haven't had a chance to measure a new motor yet but I do know that there are a lot of issues to address. Setting up the fuel system, running sensors, etc.. I have found a place in Alabama that pulls engine tranny and ECU out of wrecked cars so you can get a complete set-up. With seeing the Camaro renaissance and the amount of fuel injected V-8 transplants I know it is very feasible. I would love to put a small supercharged HEMI in my D24 to make it a sleeper.

[Johnny 5]

I have a new Street Rodder magazine that shows a 1949 Dodge coupe with a new hemi. Like was said previously the old ones fit easy breezy and the new ones are way smaller so shouldn't be a problem mechanically, just electrically (computer, 12V system, etc)

[greg g]

easy breezy, watch your language!!! Just because they can say stuff like that on TV doesn't mean you can get away with it here......

By the way I drive the new Hemi quite regularly driving dealer swaps for a dodge dealer.

They are nice powerful engines but a bit thirsty. I have never seen more 17 mpg on one on trips of 100 miles or more (yes they are brand new and might loosen up a bit with some miles) 14 is pretty much average for Trucks even with the cylinder cut out program

I'm sure with enought time, money and talent you can put any engine in your car.

[Flatie46]

Hey, wouldn't this make a great TV show! "Yukon Jack is putting a late model hemi in his P15! He has just 2weeks to get it done or they're gonna take away his bithday!":rolleyes:

Sorry, just had to poke fun at the TV shows.

[LAKOTA169]

They are nice powerful engines but a bit thirsty. I have never seen more 17 mpg on one on trips of 100 miles or more (yes they are brand new and might loosen up a bit with some miles) 14 is pretty much average for Trucks even with the cylinder cut out program

I'm sure with enought time, money and talent you can put any engine in your car.

Greg, I get up to 26 mpg on my Hemi Magnum on the highway cruising at 65-75mph. Above 75, it drops to about 23mpg. Around town it's in the 13-17 range, depending on how I drive it. Car weighs 4500 pounds.

[greg g]

probably geared differently than the trucks, however the trucks are only turning about 1900 Rpm at 70. Your Magnum is a bit more aerodynamic which might explain most of the difference. And most of these are vehicles with 5 to 10 miles on them when I get em.

Hope the customers appreciate how I break them in........

So you're the guy who bought the magnum

[YukonJack]

easy breezy, watch your language!!! Just because they can say stuff like that on TV doesn't mean you can get away with it here......

By the way I drive the new Hemi quite regularly driving dealer swaps for a dodge dealer.

They are nice powerful engines but a bit thirsty. I have never seen more 17 mpg on one on trips of 100 miles or more (yes they are brand new and might loosen up a bit with some miles) 14 is pretty much average for Trucks even with the cylinder cut out program

I'm sure with enought time, money and talent you can put any engine in your car.

Greg, My understanding was that the cars had the cylinder cut out, not the trucks. Which contributes to the higher mileage on the Magnum and the lower mileage on the trucks.

[wayfarer]

I have heard of several 5.7 swaps and the underlying theme is 'bring lots o money'. The electronics, apparently, is something akin to a nightmare unless you have a MS in electrical engineering. If you bought a complete wreck then you could salvage the entire wiring harness with all of the interconnected computers and sensors and go from there. It may also be worth a call to one of the specialty wiring shops like Painless or Megasquirt to see if they have developed a stand alone system to operate a bare bones engine. Several magazines have done this swap so it is possible, but just how check-book-friendly it is remains to be seen.

Do a generic search for "5.7 Hemi swap" and see what turns up....and keep us posted.

[greg g]

the 2010's have it in the trucks, so milege has gone up from 14 to 17 maybe a bit more on longer trips. There is a display on the inst panel that give you mileage and an "eco" light comes on when the cylinders cut out.

[Frank Elder]

Greg, I get up to 26 mpg on my Hemi Magnum on the highway cruising at 65-75mph. Above 75, it drops to about 23mpg. Around town it's in the 13-17 range, depending on how I drive it. Car weighs 4500 pounds.

Yes, but your car is more aero than any truck could hope to be.

[Dennis Hemingway]

Hereare some that have been at the show at Big Bear Lake the last couple of years.

Dennis:cool:

[Andydodge]

Whilst this is slightly away from the Hemi in a Mopar question a mate of mine here in Oz has a 40 Ford Coupe with a late 90's Toyota Lexus quad cam V8 & auto........he only HAD to use 2 of the 3 computers, has a wiring harness as thick as a mans arm using VERY thin wire and after suppling an aftermarket US sourced wiring harness that cost about $4-500.00 Aust and various other wiring bits etc, the wiring bill from the professional sparkie that he took the car to came to over $5000.00 Aust, with the car in the sparkies workshop most of the time but with some sparkie house calls........I ain't NEVER gunna run a car with a computer......never......lol.......but the Lexus V8 fits well and goes like stink.......andyd

[hkestes41]

I know its not a P15, but I bought a flathead and OD from a guy in the Denver area who was putting a 5.7 from a Dodge PU in his 53 Suburban. Looked like it fit as well as any other V8 swap I have seen. He was running rack and pinion steering so had some extra room from that.

[builtfercomfort]

I know they make carb intakes for Ford 4.6 motors so I looked around:

http://www.xvmotorsports.com/products/detail/index.cfm?nPID=163&cid=9&cdesc=Engine%20Management

$2120, or $2570 with carb - not as bad as I feared, still a bit spendy.

Their blurb follows:

XV Motorsports is now offering complete carbureted solutions for the 5.7 HEMI.

This is a complete, fully tuned solution that was developed to provide the simplest, easiest and most cost effective way to run a 5.7 HEMI in whatever type of vehicle you like. Until now, full EFI solutions were both complex and expensive. Our solution has been fully engine dyno tested and optimized. Further, it has been installed in one of our vehicles to dial in driveability and responsiveness.

Click here to see our XV 5.7 HEMI Carb Kit Product Document with complete details on all the available systems, system components and dyno sheets.

Popular Hot Rodding Magazine performed a detailed test of the XV HEMI Carb Kits with outstanding results.

Check out the details here: PHR Test

The 11-3805 kit comes with XV Custom tuning and an optional XV calibrated carburetor and delivers 400 HP:

# XV 5.7 HEMI Intake Manifold

# Engine Controller - Fully programmed with XV tuning for stock 5.7 HEMI Cam Profile

# Controller wiring harness

# Camshaft

# Valve Springs

# XV Calibrated Holley Vacuum Secondary Carb (optional)

[Fireball]

Here's an article http://www.hotrod.com/techarticles/113_0705_engine_swap/chrysler_hemi.html

and this kit from Mopar makes the swap a snap, your wallet will snap also

https://www.wyckoffchryslerparts.com/scripts/prodView.asp?idproduct=-2547

[wayfarer]

WOW! So, for something like $2000-$4000 you can buy the electronics needed to install a 5.7 in a non factory application. Then you still have to buy the engine, maybe another $1000 - $2000. Incredible.

If I'm spending 6 large I'm building a 392.

[Plymouthy Adams]

that is a step backward compared to the stock injection..the stock is not that hard to retrofit...especially from a Dakota as the wiring harness is seemingly tailored to fit these old cars without modification....way too much money for less than adequate system..

[YukonJack]

I know they make carb intakes for Ford 4.6 motors so I looked around:

http://www.xvmotorsports.com/products/detail/index.cfm?nPID=163&cid=9&cdesc=Engine%20Management

$2120, or $2570 with carb - not as bad as I feared, still a bit spendy.

Their blurb follows:

XV Motorsports is now offering complete carbureted solutions for the 5.7 HEMI.

This is a complete, fully tuned solution that was developed to provide the simplest, easiest and most cost effective way to run a 5.7 HEMI in whatever type of vehicle you like. Until now, full EFI solutions were both complex and expensive. Our solution has been fully engine dyno tested and optimized. Further, it has been installed in one of our vehicles to dial in driveability and responsiveness.

Click here to see our XV 5.7 HEMI Carb Kit Product Document with complete details on all the available systems, system components and dyno sheets.

Popular Hot Rodding Magazine performed a detailed test of the XV HEMI Carb Kits with outstanding results.

Check out the details here: PHR Test

The 11-3805 kit comes with XV Custom tuning and an optional XV calibrated carburetor and delivers 400 HP:

# XV 5.7 HEMI Intake Manifold

# Engine Controller - Fully programmed with XV tuning for stock 5.7 HEMI Cam Profile

# Controller wiring harness

# Camshaft

# Valve Springs

# XV Calibrated Holley Vacuum Secondary Carb (optional)

Thanks for the information you and Fireball passed along. My original intention was to use a 5.7-6.1 low mileage take out. I've seen the engine, transmission and computer for 2500.00 - 3500.00. Not interested in spending another 2000.00 - 4000.00 to make it work. I was more interested in installation with factory harness and computer. Basically taking everything out of a running wreck and installing in my car if possible. Or perhaps an aftermarket harness to simplify the wiring.

[YukonJack]

that is a step backward compared to the stock injection..the stock is not that hard to retrofit...especially from a Dakota as the wiring harness is seemingly tailored to fit these old cars without modification....way too much money for less than adequate system..

I agree Tim, going from injection to carb seems like a step backwards. Are you the person installing the injected V6 in a 50's car?

[Plymouthy Adams]

yes..I sent you a PM big guy...

[Plymouthy Adams]

that is not really a carb..it rings true to early TBI (some folks call these leaking toilet bowls) engines of the early 90's long before the MPI and SMPI and later sequential MPI of which the later is by far the better performer. The dial-an-enrichment system is adequate for running the engine but I assure you I do no think you will find it at all as efficient as the factory late model setup and it will also be seriously lacking in horsepower at the same time.

An early 318 with the TBI would be an easy retrofit and coupled with the A518 four speed automatic with hydraulic shift (non computer with flip switch override on the OD) would be a walk in the park...they are still available and an excellent place to look for a good set up that would probably still be decnet enough on mileage would be to look to a early (pre-94 Ithink) B250 van. These would be quick and easy mods and relatively inexpensive.

Edited May 18, 2010 by Tim Adams