Pentastar V6 engines reliability

Pete Owner/Technician United Kingdom Posted   Latest  
Discussion
Drivetrain
Competion Usage

Hi All - looking for comment and examples perhaps of this engine being used for competition. We are off road racing fanatics and are looking at this engine to use in a class which limits engine size to 3.5l/3500cc. Not turbocharged or Supercharged as this does not suit application. Trying to achieve only 300hp and 300nm Torque with mild improvements inc' re-mapping ECU and possibly fuel management/injectors upgrade. Ideally no engine strip down for improvements to be made so stock motors can be used to maintain budget and be sourced/interchanged easily when failure occurs…..

Pentastar on paper looks good base as its all alloy construction makes it light, its Quad Cammed and bolts up to some usable transmissions as standard…

But we have no reference of they're reliability and tunability so hopefully you will all have some good and bad points to air so we can make an educated decision.

Also will be looking for a supplier to the UK once we know what we are doing…

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Davon Owner/Technician
Kansas
Davon
 

I am definitely no expert in the racing world, but I can tell you the weak point we have experienced on these engines. The main things would be roller/rockers going bad and wiping out the camshafts. The other things we see a lot of is the oil coolers leaking under the intake….As far as the base engine, meaning crank and pistons etc. We have not seen problems. Hope this helps!

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Pete Owner/Technician
United Kingdom
Pete
 

Thank you for your time

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Jim Owner/Technician
North Carolina
Jim
   

Honda 3.5L all the way, speaking from experience, user friendly, low operating costs. Personally I would never consider the Pentastar engine.

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Jesse Owner/Technician
Georgia
Jesse
   

You are in U.K. I am in U.S.A. so I cannot speak for prices over there but these engines fail often in the real world.. They can be fixed but, due to high failure rates, used engines are expensive to me. You have a better budget if you are racing so it may not matter.. Timing chain engine and the oil pump is timing chain driven. It has been in service for a while now so there are upgraded parts…

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Jesse Engineer
Missouri
Jesse
 

I think you have some things crossed here. The “Pentastar” engine is a 3.6l engine, not 3.5l. It already makes 305HP to start with, no mods. These engines started in 2011 and on to current day. Now, before 2011, they had the 3.5l V6. It was 255Hp and 275Tq. Very reliable engines. The main issue with them is poor PCV functions. This caused sludging mostly on the passenger head. This was because…

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Interesting
Pete Owner/Technician
United Kingdom
Pete
   

Thankyou both for that - I thought there was a 3.2l version in the Jeep which i was hoping could be tuned to get the 300bhp or more somehow - info taken from Wikipedia 3.2 L; 197.7 cu in (3,239 cc) 83 mm (3.27 in) 2014– 271 bhp (202 kW; 275 PS) at 6750 rpm (Cherokee)

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Jesse Engineer
Missouri
Jesse
 

I checked out your reference. Apparently they do have a 3.2l. I'm sure the 3.2l & the 3.6l are based off of the same design. From what I saw the bore & stroke a different between the two. I know on the 3.6l engine, the exhaust manifold is integral to the head. Exhaust pipe bolts directly to head. On the 3.6l engines, they are bad about the roller bearings on the roller rockers failing…

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Adam Owner
Arizona
Adam
 

Price,availability,durability,power. everything points toward a Toyota for me. The 3.5 is right at 300 HP as it sits, and it is readily available. I believe looking at the overall picture, transmission options are better, also.

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Pete Owner/Technician
United Kingdom
Pete
 

Thanks for your time. Toyota v6 is cast iron block so too heavy for application. Can't see anything online in Toyotas range with aluminium block v6

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Adam Owner
Arizona
Adam
   

you may want to look again. Honda=360# , Toyota 2GR-FE =360# aluminum block light enough for Lotus to use motorreviewer​.​com/engine​.​php?eng…

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Arthur Owner
Missouri
Arthur
 

Honda J35A8. Hands down one of the most reliable engines that will take constant abuse without a single complaint in the world.

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Agree