who makes the i4 motor in 2008 Canyon? - Chevy Colorado & GMC Canyon
 
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post #1 of 6 (permalink) Old 08-19-2015, 05:52 AM Thread Starter
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who makes the i4 motor in 2008 Canyon?

to me it feels like an Isuzu or something similar.
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post #2 of 6 (permalink) Old 08-19-2015, 06:03 AM
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Regardless of which engine you're specifically speaking to, the manufacturer is GM. Wikipedia does back up that they appear to be Isuzu Type J derived.

https://en.wikipedia.org/wiki/Chevro...lorado#Engines
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post #3 of 6 (permalink) Old 08-19-2015, 09:56 AM
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post #4 of 6 (permalink) Old 08-19-2015, 11:41 AM
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Co-designed by GM with Isuzu initially, but they are (were) built stateside by GM at the Tonawanda Engine plant in NY, as stated above. They are no longer in production of course, with the end of the 1st gen 355 truck production in 2012 and introduction of the 2nd gen Colorados/Canyons in 2014.

To me, (considering the fact I have a manual transmission) they act more like a mini-Hemi, so they need high RPMs to get into the sweet spot of their "powerband". This is probably not so noticeable with an auto transmission I imagine unfortunately, unless you have a tune on it/tweaked transmission shifting points via the PCM. After hitting 2.5-3k RPM is where I'd say they start getting some good torque, at least that's what it feels like on my truck anyway, haha.

2006 Chevrolet Colorado Regular Cab Black w/sports pkg., 2WD, 2.8 I-4 w/ Manual Trans.
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post #5 of 6 (permalink) Old 12-01-2015, 09:06 PM
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Quote:
Originally Posted by Colly_shifter View Post
To me, (considering the fact I have a manual transmission) they act more like a mini-Hemi, so they need high RPMs to get into the sweet spot of their "powerband".
That's typical behavior of a DOHC engine, though I've no idea why you would think of it as a "mini-hemi".


Here's the GM dyno sheet from the 2010 2.9L, a fine example of a "normal" DOHC torque curve. The torque curve is very steep at lower RPMs. At 2000 RPM the torque is probably 15% less than peak, and at 1500 RPM it's probably more than 25% less. Above 3000, however, the curve is very flat - it looks like from 3000 to 5500 RPM it's never more than 5% less than peak torque.

And for comparison, here's a classic example of a pushrod engine, the 2010 4.3L V6. In the case, the peak is still around 3000 RPM, so that's a fortunate accident for my comparison...but look at how differently the curve is shaped. At 2000 RPM the torque is probably within 10% of peak, and at 1500 it's still probably within 20%. After the peak you can see it doesn't stay nearly as flat as the 2.9L does, it decreases at an even quicker rate than it increased in the lower RPMs, and at 5000 RPMs it's down probably 30% from peak power, and if you were to follow that slope for another 500 RPMs I bet it'd be roughly 40-45% less than peak at 5500, where the 2.9L is still within about 5% of it's peak.

The newer DOHC engines are getting better than the older ones were at lower RPMs, but remember the Atlas engines are at this point pretty archaic.


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Last edited by naskie18; 12-01-2015 at 09:08 PM.
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post #6 of 6 (permalink) Old 12-02-2015, 10:04 AM
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Quote:
Originally Posted by naskie18 View Post
That's typical behavior of a DOHC engine, though I've no idea why you would think of it as a mini-hemi.
That's because to my understanding, when compared to the GM Vortec engines(technically what the Atlas engines are too mind you) where typically their power is mostly in the lower RPM ranges, where the Dodge/Chrysler Hemi engine's powerband is mostly in the high RPM ranges. While what you say is true with DOHC engines, the Atlas engines reminds me more of a Hemi than a Vortec in this regard, thus why I made the comparison. Sure, I understand that engine construction and design has a big factor in this type of performance/behavior as well as their differences, but I do find it ironic that the Hemi's and DOHC engines/Atlas's have similar characteristics in this regard. Sure, I'm no expert on the matter and certainly don't claim to be one by any means. However, I'm not the first to make this observation or statement either, at least not at 355nation.net anyway, haha... Alas, opinions, buttholes and all dat sorta jazz apply here too of course...

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Last edited by Colly_shifter; 12-02-2015 at 10:16 AM.
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