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rhussjr #1443310 Thu Mar 03 2022 05:35 PM
Joined: Jan 2014
Posts: 2,342
I think this is a cool project. Plenty ambitious, but cool.

As much as we poke fun at these “tractor engines”, I’ve often wondered what would have been possible in terms of performance/ longevity/ economy if one could solve some of the inherent issues with Stovebolts:

* Crummy fuel distribution
* Crummy drivelines they were used with
* Pre-PCV blow-by covering internal parts with sludge.

Yes, they don’t flow air very well. They are heavy. But they are simple, rugged, well-balanced, and generate plenty of usable torque even as they are.

The driveline issue has been largely solved for those willing to do the T5 swap. Plenty of folks have created serviceable PCV systems for their stovebolt. Fuel delivery/ distribution seemingly has much room for improvement. Aside from the side draft YH setup that is unobtainium…and a few theories I’ve seen about custom manifolds with side draft motorcycle carbs….your project seems to be the most serious effort I’ve seen in that direction.

I suspect it isn’t going to create a practical solution for “the rest of us”, but I’m interested to see what you learn.

Last edited by JW51; Thu Mar 03 2022 05:50 PM.
rhussjr #1443311 Thu Mar 03 2022 05:57 PM
Joined: Jan 2014
Posts: 2,342
That’s a Thickstun or Thickstun-replica manifold. I’ve read that the theory with those goofy looking things was to equalize the runner length, but I’ve never read anything that proves any benefit.

Did you select the Thickstun because of the runner length?

rhussjr #1443352 Fri Mar 04 2022 12:51 AM
Joined: Dec 2008
Posts: 1,781
The degree of atomization and droplet size has been tunable for many decades, it's what an emulsion tube (and its functional equivalents under other names) adjusts. In many carburetors it's a sized series of holes, which is why CFM is not a perfect comparator of accuracy on a different engine.

Vizard demonstrated that engines starved for air (low VE) produce more power with larger droplets, and engines with excellent VE do better with finer mist. The reason: a fully vaporized molecule of gas is 400 times the volume of liquid, and displaces air in the charge mass.
The degree of vaporization also affects how mixture behaves in a manifold (fine mist has lower inertia), and at different vacuum and temperature levels.

The "Slant 6" intake runners are made in different length on purpose to broaden the torque range.

rhussjr #1443454 Fri Mar 04 2022 09:08 PM
Joined: Jan 2014
Posts: 2,342
I like listening to David Vizard.

52Carl #1445901 Fri Mar 25 2022 03:25 PM
Joined: Dec 2018
Posts: 1,978
52 carl Just saw your comment about tractor engines,very true,I think they will run on coal oil too !! It is satisfying though to update to better stuff and get a durable,easy to work-on outfit.

fixite7 #1448574 Mon Apr 18 2022 01:59 PM
Joined: Feb 2021
Posts: 16
rhussjr Offline OP

tom moore #1448586 Mon Apr 18 2022 04:49 PM
Joined: Jan 2013
Posts: 1,685
Originally Posted by tom moore
Thank you for sharing this project. Please continue to do so.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
rhussjr #1448605 Mon Apr 18 2022 08:55 PM
Joined: Mar 2010
Posts: 1,640
Your last picture looks like a different year engine from your youtube video. Just curious.

Like Raphael, the artist who left a hidden self-portrait in his painting, I see you left one in your picture.

Attached Images
09.jpg (11.94 KB, 167 downloads)

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
rhussjr #1450376 Tue May 03 2022 12:49 PM
Joined: Feb 2021
Posts: 16
rhussjr Offline OP
Started the prototype mounting plate for progressive / direct throttle linkage setups for 2x1 and 3x1 intakes.



Last edited by rhussjr; Tue May 03 2022 12:51 PM.
rhussjr #1450386 Tue May 03 2022 01:58 PM
Joined: Sep 2013
Posts: 1,421
Ok, you're gonna need beta testers. I'm here if you need me.

That's nice beyond words. Best of luck (although luck really isn't required from what I see)


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5

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