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  • Truck Trend Letters to the Editor: Emissions Check.

Truck Trend Letters to the Editor: Emissions Check.

Emissions Check

Oct 4, 2017
Photo 2/5   |   Emissions Check Truck Trend Sticker

Stuck Up

My letter was published in the March/April 2017 issue for pointing out typos. You stated that Truck Trend stickers were in the mail but I haven't received mine yet. Was this perhaps another typo?
Rod O'Byrne
Oh man, we suck. We’ll make sure we settle up with stickers to all who asked ASAP.
Photo 3/5   |   Emissions Check Maintenance

Million-Mile Maintenance

Loved the article about the Million-Mile Tundra. However, nowhere did I see listed the maintenance performed on the truck. I want to do the same for my ’16 Ram 1500 with a 5.7L Hemi to keep it going strong for a great long while!
Joe Nichols
Summit Hill, Pennsylvania
Our best advice is to follow the manufacturer’s recommendations for service intervals and replace parts and fluids with ones that meet or exceed the specifications listed. That doesn’t mean you have to have it serviced by a dealer, but be sure you do what they say. Mr. Sheppard did little more than change the oil in his Tundra. Maybe he got lucky, but if you stay on top of preventative maintenance it’ll give your engine the best shot at making it a million miles as well.
Photo 4/5   |   Emissions Check TRD Supercharger

More Power!

As a ’16 Toyota 4Runner owner, I was hoping Truck Trend could help with advice for getting more power from the 4.0L V-6 engine, without negatively affecting the warranty. I have installed a K&N air intake and a Borla exhaust on my vehicle.
John Zachary
Quebec, Canada
First, the biggest elephant in the room, anything you do will in someway affect your warranty. It could range from a simple service writer giving you attitude all the way up to repairs being denied. That said you’re off to a good start. Your next move will be a good tuner, something from Hypertech, Edge, Diablo, Superchips or the like. Have you increased tire size? If so regearing the axles will bring back your lost pep. And if you’re really serious about making more power you’ll want to find the now-discontinued TRD supercharger.
Photo 5/5   |   Emissions Check 392 Hemi

That Thing Got A Hemi?

I loved the latest issues article on the history of Chrysler’s Hemi engines, but I’d like to offer a little bit of information—well really, clarification.
First off, do not believe any stated power rating of any pre-1972 engine. It doesn't matter what it is, the SAE method of rating engine power was very different prior to 1972. For example, it did not include the usual engine-driven accessories in place such as the water pump, power steering pump, alternator, or AC compressor, among others.
The other thing would be the current Chrysler Hemi engine; I am not usually a nitpicker but I'd categorize these as a pentroof, not a classic Hemi with the valves at a characteristically steep V angle. The combustion chamber shape and angle is very shallow in these new Hemi V-8 engines.
As for the twin-spark plug setup on these new Hemis, these engines would have likely never been emission certifiable sans the twin-plug fast-burn combustion chamber design they use. The plugs don't fire simultaneously, it’s a leading and trailing firing order. Basically an old racing idea adapted for the street.
Brian Dumas
Paragould, Arkansas
Thanks for the information! Chrysler’s Hemi engine is quite the legend and has a very storied history. These days the Hemi name is as much a marketing play as a description of the head design. It’s not surprising, from an emissions and performance standpoint, that the current combustion chambers share little with their forefathers.