Turbocharged Mopar 225 Slant 6 with Custom EFI Makes Big Pump-Gas Power - Engine Power S10, E9 & 10

New 2023 episode! You asked for it and here it is! We put together a dream build Mopar Slant 6 that has a ton of custom touches to bring it into the 21st century with A LOT more power. It starts with a fully-forged rotating assembly for great durability and a hand-ported cylinder head for a huge induction upgrade. Then we’ll top it off with a custom-built EFI system for sequential fuel injection and sequential Coil-Near-Plug ignition, and a turbocharger to see how far we can push it on pump gas! In the end, it's an old-school engine with all the luxuries, and power, of a modern powerplant.

00:00 - Intro
01:08 - Build Overview
06:06 - Balancing the Crankshaft
08:41 - Block Assembly
11:46 - Piston Ring Tech
17:01 - Fuel Injector Sizing
18:18 - Assembly Continued
29:04 - Sealing Up the Bottom End
29:58 - Cylinder Head Adjustments
33:25 - Fastening the Head to the Block
37:01 - Building an EFI Harness
38:17 - Dyno Test Pulls
39:21 - Adding a Turbocharger
39:44 - Boosted Dyno Runs

Follow POWERNATION Everywhere:

PARTS USED IN THIS EPISODE:

ARP: ARP Bolts

Comp Cams: Custom Grind Camshaft

Comp Cams: Performance Series EDM Solid Lifter Set AMC

Comp Cams: Valve Springs

Holley: Holley EFI Smart Coil Packs

Holley: HP EFI ECU

Summit Racing: Fuel Injectors

Total Seal: Total Seal Assembly Lube

Total Seal: Total Seal Piston Rings

Summit Racing: Summit Racing Pro Ring Filer

Aussiespeed: Aluminum Valve Cover. Dutra Dual Cast Slant 6 Headers. Hurricane Aussiespeed 4 Barrel Slant 6 Manifold

CWT Industries: CWT Multi-Bal 5500

Gill Welding & Fabrication: D-150 Slant 6 Header Pipe

Molnar Technologies: Molnar Chrysler Slant 6 H-Beam Connecting Rods

Wiseco Performance Products: Wiseco Custom Pistons

Yella Terra: Rocker Arms & Rocker Caps

ARP: ARP Head Stud Kit Chrysler Cast Iron SL6

ARP: Harmonic Damper Bolt Kit for Chrysler

Comp Cams: Custom Grind Camshaft

Comp Cams: Performance Series EDM Solid Lifter Set AMC

Comp Cams: Valve Springs

Holley: Earl's Performance Plumbing & Fittings & Hoses

Holley: Holley EFI Smart Coil Packs

Holley: Holley EFI Universal 36-1 Crank Trigger Wheel

Holley: HP EFI ECU

Holley: STS Turbo Journal Bearing Turbocharger

Total Seal: Total Seal Piston Rings

Summit Racing: Trick Flow Chromoly Pushrods

Summit Racing: Turbosmart GEN-V Hyper-Gate 45 Mechanical Wastegate

Forney Industries: Forney 220 AC/DC Tig Welder

Gill Welding & Fabrication: D-150 Slant 6 Turbo Header Pipe

Gill Welding & Fabrication: Slant 6 Intake EFI Conversion

Goodson Shop Supplies: Goodson Valve Seat Grinding Stones

Molnar Technologies: Molnar Chrysler Slant 6 H-Beam Connecting Rods

SuperFlow: SuperFlow SF-750 Flowbench

[PapiDoesIt]

I built a forged crank 225 slant six that was bored to fit Mopar 2.2 liter dished turbo pistons on 198 slant six rods. Oregon Cams reground a stock cam for a little more mid-power oomph. For the valvetrain I used Ford 2.3 Ranger valves and machined the head for Pontiac 400 springs, and did a "bowl hog" on the intake side. For carburation I used a Holley 350 CFM on a modified Super Six factory intake. Spent gases left via dual Dutra manifolds, which made it necessary to use a Dakota V-6 starter. The stock distributor had lighter springs added for more initial advance, and I used a big block timing chain. I also adopted a GM HEI ignition feeding a Ford Taurus e-coil. I had it hooked to an A833 4 speed. It made about as much power as a stock 5.2 Magnum, but it was different! And it was definitely a lot of fun making something that not everyone else had. I'm glad I got to take my dad for a ride before he passed away in 2020. He was a dyed-in-the-wool Mopar nut.

[pauljcampbell]

Aussie fan here. I love the fact your doing a tough inline 6. Especially the old leaning tower of power 225! Excellent!

[midwestlee-iwnl]

for a engine that was designed, a half century ago, this is impressive . long live the mighty slant six !

[thespicemelange.]

It's funny to see Frankie slowly becoming Pat's protege. Before you know it Frankie will have a pocket protector, goatee and receding hairline just like Pat.

[wdwilson]

Slant 6...Bullet proof stock. Ran one 100 miles without a working water pump to get home, changed the pump and good as ever

[CarsandCats]

Best /6 build I have EVER seen! 500lb-ft at 3, 000rpm is a good big block torque number! That's just insane.

[infoanalysistconspiracyrealist]

Over 400hp and 500lb of torque is impressive for a leaning Tower of Power.
Go the mighty Mopower!

[buckbuck]

It's official. I'm old. Sat night and I'm watching an engine build.. very cool..

[Maltechr]

You should invite some of the great Aussies over, or even take a trip down under to build a Barra! That'd be really cool to see your take on it!

[rbyfheq]

Next time I see an old duster beside me at a light, I’ll think twice. That is some serious torque!

[outlawbillionairez]

If Dennis Weaver had this motor in his '71 Plymouth Valiant, in 'DUEL', he would have stood a chance against the truck!

[joshuavisser]

This and the ford 300 have been the most awesome videos I have seen. I love the creativity and ingenuity that goes into these less common builds. You guys set a world record in my book, 400 hp and well over 500 ft-lbs of torque with 11 pounds of boost is wicked. I would be curious to see what it does with 15 pounds of boost. I guarantee the power numbers would be a record 😉

[jimshorts]

Dropping this into a light A-body like a square body Dart with a 5 speed would make an incredible track day car. With overdrive, an eco tune, and a sane 3:55 rear gear, mileage above 25mpg wouldn't be hard for a great track and street package.

[sntduke]

I'm a big block Ford guy and this was one of the coolest most interesting builds I have watched on your show. Keep it up this was great. Really love the creative ingenuity and tech skills shown.

[DishNetworkDealerNEO]

I’m in Mopar Heaven with this build! I have owned 5 slant six engines and know them so well! These are great engines!

[jryer]

This build was awesome. Never would have thought 400 H.P. on a fairly conservative 11 psi of boost. And that torque is going to light some tires.

[GillWelding]

We loved being part of this build, and we are proud of your out come. Nice work!

[partymanau]

Those old Slants could be beasts. We had them down here in Oz. Much respect for Mopar Technology.

[RobertBeck-ppru]

This engine was originally designed as a reliable do-all machine mover: cars, pick-ups, boats, sawmills, off grid electric generator, you name it. What you guys did with it is truly AWSOME. I loved my '73 Duster with its slanty-six. Chrysler should have used a good cross flow head on these right from the start. Never dreamed it could be so capable with 21 century tech.

[detroitjohn]

Absolutely the best engine Chrysler ever built. Had four 225's and one 170 engines, The last was '81 Dodge truck, super six (2 bbl) 2.5" exhaust. MSD 6 / MSD coil. MSD copper plug wires. plugs gapped at .065. 22-24 MPG with O.D. 4 speed. sold with 400, 000 miles to a guy in Traverse City Michigan. Last I knew it was past 500, 000 miles when I lost track of him. Had to pull the head at 350, 000 miles and replace number 6 exhaust valve with full clean up & valve job. Just an absolute great engine ! There is a buddy in Thawville Illinois with a Dart that has a turbo charged slant six from 30 years ago. Lots of slant six fans out there !