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Originally Posted by fireindian
I hear quad 4 but not any mention of the Tech 4. What's the difference? And any suggestions on how to make this engine run cooler?
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Night & day difference.
The 4Tech was GM's OHV 2.5L (if I rember Correctly) 4cyl motor... nicknamed the Iron Duke. Rattle trap of an engine, prone to smoking. But supposedly real reliable (basically because they had like 50hp...lol). Basically an "Old Technology" Econo engine.
The Quad4 was GM's attempt at an Econo. motor with some actual performance.... major differences were DOHC, 4 valve per cyl, aluminum head, MPFI... Basically a higher performance engine... reliability is in question... seems to boil down to how well they were maintained. But have seen some with 300k+ & no major repairs. That engine design is still in use today. Came in 2.3L to start & are now 2.4L.
Looking for something specific???