Early Bronco Charts

oldy1978 · Dec 23, 2015

Hi new member here and first post. I figured I would start by offering the community something. I typed up some of the data for the early Broncos from the out of print Chilton Book into a few spreadsheets, I hope they are useful but be mindful of errors I am not the best at data entry.

Enjoy and happy holidays.

Oldy

http://classicbroncos.com/photos/data/7279/BroncoTuneUpSpecs.jpg

http://classicbroncos.com/photos/data/7279/BroncoFluidCapacities.jpg

http://classicbroncos.com/photos/data/7279/BroncoGeneralEngineSpecs.jpg

And here are the same charts in PDF format if you prefer:

http://classicbroncos.com/tech/BroncoTuneUpSpecs.pdf

http://classicbroncos.com/tech/BroncoFluidCapacities.pdf

http://classicbroncos.com/tech/BroncoGeneralEngineSpecs.pdf

jray · Dec 30, 2015

Nice work!

thesnake · Dec 30, 2015

That is nice! Welxome to the site and thank you!

John

Bronco Biff · Dec 30, 2015

Excellent data entry!! Checked out your garage also. Need some more pics of those fine steads!! The white one looks like it might have a good resume for pushing some snow!! Welcome aboard!!

blamejane · Dec 30, 2015

Welcome to CB and thanks for the charts Oldy.

NGABronco · Dec 30, 2015

Welcome aboard!!! And thanks for the chart work, good info!!!;D;D;D

You need to join up with the "BONES" group!!! A great bunch of guys, they do several get-to-gethers and most are on here!!!;D;D;D

panalukes · Dec 30, 2015

I always found those numbers interesting. I have a 77 with 134 stock horsepower. wooohooo! I wonder why it dropped down so much from 205 in the early 70's. Is it just a numbers game or did the emissions crap really lessen the Horsies.

miikee73 · Dec 30, 2015

panalukes said:
I always found those numbers interesting. I have a 77 with 134 stock horsepower. wooohooo! I wonder why it dropped down so much from 205 in the early 70's. Is it just a numbers game or did the emissions crap really lessen the Horsies.

Emissions ,notice cyl volume increased along with HP decline,less compression.

gnpenning · Dec 30, 2015

Welcome aboard.

Talk about maybe the best first post ever.

Can't wait to see where it goes from here.

JefeAZ · Dec 30, 2015

302 just sounded cooler than 301?

redwards69 · Dec 30, 2015

Welcome. Awesome stuff, thanks!

DirtDonk · Dec 30, 2015

panalukes said:
I always found those numbers interesting. I have a 77 with 134 stock horsepower. wooohooo! I wonder why it dropped down so much from 205 in the early 70's. Is it just a numbers game or did the emissions crap really lessen the Horsies.

It was both. As was mentioned, the lean mixtures and odd ignition timing and funky things they were literally experimenting with, did make a difference.
But the largest initial difference (between '71 and '72) was due to them using a completely new method for rating the HP numbers for consistency between all the manufacturers.
In simple terms, they went from GROSS power to NET power in '72.

And of course, as compression ratios dropped, cam profiles got lamer and mixtures got even leaner while they were hunting for that magic combination of numbers that would lower certain emissions, things just kept dropping and dropping.

The upward curve finally started taking shape in the mid to late eighties, when things started getting figured out and compression kept coming up and electronics kept getting more sophisticated. Unfortunately, we just got caught in the middle while they were trying to figure it all out.
Cars tended to get things sooner than trucks, and some cars better than others (think Corvettes, Mustangs and Cadillacs for instance) until we got back up into the old arena, and then above and beyond.

We might bemoan the loss of '69 L88's, '70 LS6's, Cammers, SOHC'rs and Boss', but anytime you can run a 13:1 compression, 600 hp engine on pump gas, have it lug right on up from idle to 6500 rpm without so much as a burp or cough, and get 30 mpg while doing it. I think things have come back with a vengeance!

Luckily we can put some of that knowledge in our old rides and still have them pass smog tests where needed, and run like the clocks we always thought they were.;D

So let's put a pumped up Explorer motor in that '77 of yours and take it racing!

Paul

Teal68 · Dec 30, 2015

You should get an award for best first post! Welcome!

sprdv1 · Dec 30, 2015

Welcome aboard & Thanks for sharing that Tidbit

CopperRanger · Dec 30, 2015

Teal68 said:
You should get an award for best first post! Welcome!

X2, welcome

fatboy · Dec 31, 2015

NGABronco said:
Welcome aboard!!! And thanks for the chart work, good info!!!;D;D;D

You need to join up with the "BONES" group!!! A great bunch of guys, they do several get-to-gethers and most are on here!!!;D;D;D

Yes very cool charts, thanks for the info. As for the Bones group, New England is pretty big but we have a lot of active members all over.

turbotim2 · Dec 31, 2015

Welcome to CB, thank you for the charts!

Jeff10 · Dec 31, 2015

Hi Oldy,

Welcome to the forum. As others have said, great post!

I was wondering if you'd like to share the information in whatever file format you created. I'm always looking for useful information to save.

I can PM you my email address if you're interested.

Thanks,

Jeff

gnsteam · Dec 31, 2015

Welcome and thank you for the great information.

smokinjoe · Dec 31, 2015

Now THAT'S a first post! Well done Sir! Welcome to CB.

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