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Old 02-13-2015, 03:11 PM
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RWD Quad 4

Today is my first on the Hot Rodders forum. I see many different threads to follow and glean something from it, even if I just find out there's nothing there for me.
I have a 1985 GMC S15 Jimmy with 2wd project. It has a 2.8 V6/5 speed but that's not why I wanted to post my post. I want to find out if anyone here has ever built a Quad 4 engine for a two wheel drive vehicle. I know they came from the factory with some front wheel drive cars but I'm not sure about RWD.
I have my eyes on a 1991 2WD S10 short bed pickup. I had 1987 S10 pickup a few years back and now I want to build another. The vehicle I'm looking to get has the 2.5 liter "Iron Duke" 4 cylinder, 5 speed trans and a short bed. I got 22 MPG around town out of the one I had in the past and that was without babying it at all. It's light weight and fun to drive and I want the big trunk! I'm currently enrolled in a Mechatronics program at a near by tech college. It invlolves electro-mechanical engineeringand the exercises the instructor described to me sound like things I would do for fun on my own. I'm amped about it. I want the big trunk for hauling parts and stuff.
So, if anyone can shed any light on the Quad 4 animal I'm looking for, please do so, even if it's info about why it's not done too often.
Thanks and I'm looking forward to participating in the forums.

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Old 02-13-2015, 05:40 PM's Avatar
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No rear wheel versions of this engine.. It is actually a poor engine choice,, in my opinion,, cause I got to work on all the failed ones.. The engine went thru many changes during its production years and has very little interchangability between years and VIN numbers..

Plenty of head, valve, camshaft and head gasket problems, timing tensioner failure, oil pump failure. A new design/modification every year and no interchange.. Dual cam, single cam, doesn't matter. All were a nitemare.. Sorry, just sayin, saw a lot of PO'd GM owners that changed to Toyotas..
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Old 02-14-2015, 08:54 AM
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Quad4Rods still sells a RWD bellhousing for the Q4 motors. I had a Q4 in a 1990 Grand Am and had no problems with it at all (the POS TH125 trans finally went out). Many folks have converted them to RWD use, mainly in street rods. The Q4 can be dressed to impersonate an old Offy engine.

New life for the Oldsmobile Quad 4 engine | Autoweek

GM's Quad 4 & Ecotec Engines And Ford's Zetec & Duratec Engines- Rod & Custom Magazine
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Old 02-14-2015, 04:03 PM
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Thanks for your input. I, too, have heard of some nightmares involved with the Quad 4 and it's easy to see the problems with parts interchangeability (is that a word?) due to many, many modifications the factory made.
I'll probably let that idea set for a few years before making a move.
But thanks again for your input.
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Old 02-15-2015, 03:53 PM
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While it's not as attractive as the Quad-4, the Ecotec would be cheaper, can take a lot of boost, and has a factory RWD bell housing available.

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Old 02-15-2015, 06:36 PM
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Thanks Kevin. I'm probably going to keep the 2.5 and maybe add some speed to it. Has anyone heard about porting the head? How about a home brewed turbo?
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Old 02-15-2015, 09:00 PM
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Pontiac 2.5 Litre | Hemmings Motor News
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Old 02-16-2015, 09:43 AM
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go old school! Pontiac Trophy 4 ftw!
Half a 389? Why not!

Okay if you're less crazy than me; an Ecotec is a hard hitting 4 banger. My moms boss has a Saturn Sky Redline and let me tell you; its absolutely NOT a creampuff "hausfrau wagen." It is a serious hotrod turbo 4.

2.5 Iron Duke was used as a small boat engine; they are supposed to be a little more potent than the car ones.

More avant garde: Dodge D50 truck came with a manual option and a non-turbo version of an Eagle Talon /Mitsu Eclipse engine.
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iron duke, quad 4, s10, s15

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