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Chevrolet Impala, Sedan
Mar 19, 2003 (9:40 pm)
I didn't get a chance to look through my magazine archives today at home, but the link vc posted above I read through last night. I also found another web link where someone had experimented with using the OHC heads on a pushrod block or something. Also, many Fiero sites have info on where people have swapped the Fiero 2.8 v6 for the Twin Dual Cam which suggests they have near identical block configurations and sizes.
http://www.geocities.com/MotorCity/Garage/5007/fiero_osg/60-degre- - e-V6.html
this link also suggests the 3.4 TDC was an evolution of the far too ubiquitous Citation engine.
I don't disagree that perhaps the head design for the Twin Dual cam was modeled after the Quad four, but from what I have read in the past, the block design started with the pushrod v6 because of the desire to utilize some existing tooling and manufacturing capabilities. The oiling system was modified to work with OHC and a complete DOHC top end was half$$ed on top of the modified pushrod block.
I will find the tech report in Car and Driver that breaks this out in detail. I've seen it / read it. Just need to dig some boxes up in the bedroom to get to it and find it.
Besides, in the early 80's to mid 90's GM never designed an all new v6, much less an OHC, so it was par for course for them to take a half hearted approach. So like them.
Mar 19, 2003 (9:44 pm)
The 3.4 Pushrod and 3.1 Pushrod engines are very similar, I'm not saying they aren't. But the DOHC 3.4 and Pushrod 3.1 are completely different.
Also, the 3.4 DOHC is a pretty good engine with pretty good reliability... it was just coupled with a poor alternator, and a poor tranny... vcjumper just posted the same article I did......
Mar 20, 2003 (9:36 am)
Why are we talking about the DOHC 3.4? It's not being offered anymore, and is certainly not the engine in the Impala.
Mar 20, 2003 (11:57 am)
Because we are talking GM engines, and DOHC engines. And that is a GM DOHC engine.
Mar 20, 2003 (12:15 pm)
One that hasn't been used in years and shows little of GM's supposed engineering prowess...
Mar 20, 2003 (12:34 pm)
So? You asked a question and I gave you an answer... If you want GM's engineering prowess, look at the new Cadillacs, the Northstar, the LS6, the new GM 3.6L DOHC, the 4.3L Vortec V6, and the Ecotech 4 cylinder.
Mar 20, 2003 (4:43 pm)
The 3.6 DOHC isn't out yet, so I can't attest to it. The inline six on the trailblazer is a good engine...the Ecotec 4 cylinder is smooth but underpowered and generally no better than its competition.
Wow, I'm so overwhelmed.
Mar 20, 2003 (4:50 pm)
The Ecotech 4 cylinder is just a good reliable durable engine with good power and the ability to take boost from superchargers or turbos.
Mar 20, 2003 (10:59 pm)
the only force fed Ecotec so far is the Saab. Its too early to tell yet if it will spill its innards or not when its getting rammed.
Mar 21, 2003 (6:32 am)
They sell factory/dealer installed superchargers on all Ecotecs, reggie.... Esp the Sunfire.