1985 Oldsmobile Toronado Caliente

Discussion in 'Car & Truck Talk' started by jwdtenn, Jul 25, 2022.

  1. markfnc

    markfnc Well-Known Member

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  2. 60Mercman

    60Mercman Well-Known Member

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    That was a great video. I had seen that story before, but God bless that lady and her Comet!
     
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  3. annap01gt

    annap01gt Blue Safari

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    You are absolutely correct WagontheDog. Per automobile-catalog website the 85 Safari made 165hp @ 4200 rpms / 245 lBs torque @ 2400 rpms. 1987 was 140 hp @ 3200 / 255 lbs @ 2000.
     
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  4. WagonTheDog

    WagonTheDog Well-Known Member

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    Yeah, smaller ports create more port velocity, which can increase low-end torque and lower it's peak RPM number as well.

    There's something to be said for port velocity in regards to making power. All modern engines have high port velocity engineered into them, and it's actually how Mopar's small blocks and big blocks make their power too (although, they never had ports as small as the later 307 Oldsmobile heads). Even with Mopar's best factory castings, comparatively, they have much smaller intake and exhaust ports than Ford and Chevy in particular (especially with big blocks). Even aftermarket Mopar heads are comparatively small (mostly due to the location of the head bolts and the shallower lifter bore angle, both of which cannot be changed). Very large ports may get more air/fuel into the combustion chamber, but it's a relatively lazy charge. Whereas extra port velocity is like blowing on coals and seeing them get hotter and hotter. This is due to the added turbulence in the combustion chamber, which makes for a faster and more efficient burn. Neither method is wrong, but they're just different ways of making power.

    Anyway, as it goes for the later Oldsmobile 307 heads, while the small ports in them are taken to the extreme and would never be ideal for making top power, you can see what it does for low end torque. Smaller ports can make lots of power, just not ones that are 1.30" square.
     
    Last edited: Aug 2, 2022

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