Advertisement
Find a Car
Go!

Slow Good-bye to GM's 3.8-Liter V-6

Follow Marty

2009 Buick Lucerne

2009 Buick Lucerne

Enlarge Photo
General Motors' ubiquitous 3.8-liter V-6 is soon to become extinct. For '09, it is replaced by GM's (more) modern 3.9-liter V-6 in the Buick Lucerne, leaving it barely hanging on in the Buick LaCrosse and Pontiac Grand Prix, which share a platform. Some will cheer the eventual passing of this antediluvian push-rod motor, while others will wax poetic about its bulletproof reputation, easy low-end torque, and storied supercharged and turbocharged versions.

Neither LaCrosse nor Grand Prix are competitive players in the crowded mid-size sedan/sport sedan segment (think Honda Accord, Toyota Camry, Chevrolet Malibu...but of course Buick would like you to think Lexus ES350, and Pontiac would like you to think Acura TL). That's partially due to their base engine, the 3.8-liter V-6, which is coarse and inefficient compared to its rivals' modern powerplants.

The 3.8-liter is of the ancient, but space-efficient, push-rod, overhead valve design that Chevrolet popularized with its small-block V-8 of the 1950s. In fact, the first version was a shortcut engine originally engineered by Buick in the 1960s simply by lopping two of the cylinders off its short-lived 3.5-liter V-8, though a cast-iron block replaced the V-8's aluminum block for cost reasons. According to Wikipedia, Buick launched it as the "Fireball V-6" in 1962.

In later iterations, the engine grew to its current 3.8 liters, sharing identical bore spacing and V-angle (90 degrees) as a larger Buick V-8 produced in the same plant.

Alas, a 90-degree V-6 isn't a very happy, smooth-running beast unless balance shafts quell vibrations in the compromised design (a 60-degree V-6 sends balanced power pulses to the crankshaft). The 3.8-liter loped along under the hoods of countless GM cars without balance shafts until the 1980s, at which point it became a much more pleasant and smooth-running motor.

The 3.8-liter V-6 was always meant as a low-rpm torque producer, and was employed in posh, floaty vehicles like Buicks, Oldsmobiles, and upscale Pontiacs where an understressed motor was meant to connote luxury. But being of old-school design, it didn't like to rev, and so it was perfectly happy torquing around town under grandma's gentle right foot. It got a serious boost via turbocharging in the awesome Buick Regal GNX of the '80s, which could easily smoke muscle cars like Mustangs and Corvettes of the day. But usually it was under the hood of your mom's '98 Regency Brougham or your dad's Bonnneville SE. Or in miserable economy, emissions-choked sleds like the 1977 Buick version that huffed out all of 110 hp.

GM's serious R&D has more than kept push-rod valve actuation a competitive technology (7.0-liter, 505 horsepower Z06 V-8, anyone?), and some of those advancements have trickled down to the venerable 3.8-liter. It is now relatively civil, smooth, and torquey. But it's still not happy at high rpm, and it can't compete with GM's own 60-degree push-rod V-6 family in both 3.5- and 3.9-liter flavors. That 3.9-liter benefits from variable valve timing, making it both more efficient, more powerful, and smoother due to its balanced nature than the 3.8, hence GM's decision to put it in the Buick Lucerne as base engine for '09.

Once GM kills the Grand Prix (the Pontiac G8 slots into that niche now), and updates the LaCrosse, we expect this engine's fate to be sealed. The engine won't go out without leaving a mark; Wikipedia calls it "one of the most-produced engines in history," with more than 25 million having rolled off the assembly line.--Colin Mathews
Advertisement
 
Follow Us

 

Have an opinion?

  • Posting indicates you have read this site's Privacy Policy and Terms of Use
  • Notify me when there are more comments
Comments (5)
  1. My grandfater swore by that engine and I had one in an oldsmobile for all of 186k miles. When I sold the car the engine was still going strong.
     
    Post Reply
    Vote
    Bad stuff?

  2. Well, the Chinese-made 3.4 liter V-6 185 HP is still going strong, so I don't understand what the big deal is. We should have said good-bye to that POS.
     
    Post Reply
    Vote
    Bad stuff?

  3. getting rid of 3.8 is the worst thing i ever heard i have three off them and i havent been beat yet one of them is allmost 1000 hp with out nos all i did is boost it so i getting as many of the 3.8 and 4.3 liters i can i wish you guys would think about it before you get rid of a good thing
     
    Post Reply
    Vote
    Bad stuff?

  4. 3.8 series II is unstoppable and way better than any riceoline burning hunk of scrap 96 bonneville 230,000 miles and still running like a raped ape
     
    Post Reply
    Vote
    Bad stuff?

  5. I have a 1994 pontiac bonivelle that got recked and it has a 3.8 under 70 k miles on it, I would like to put it in a 51 dodge coronet, my question is I need to hook it up to a rear wheel drive and need some sort of tranny whether stick or automatic can anyone help me, also would like to keep the fuel injection, thanks roy
     
    Post Reply
    Vote
    Bad stuff?

 

Have an opinion? Join the conversation!

Advertisement
Try My Showroom
Save cars, write notes, and comparison shop with hi-res photos.
Add your first car
Advertisement
Take Us With You!
   
Related Used Listings
Browse used listings in your area
Advertisement

More From High Gear Media


 
 
© 2014 The Car Connection. All Rights Reserved. The Car Connection is published by High Gear Media. Stock photography by Homestar, LLC. Send us feedback.