I don't think progressive linkage will work in your case - unless you have another manifold in the works. It looks like each throttle body feeds only one cylinder. You can add an idle air valve. You can borrow the one from your Chevy tb. With that, you close the throttle blades at idle and the idle speed is controlled by the computer via the idle air valve. You'll have to make a mini manifold so that the valve can feed all 8 cylinders and I don't know if it would cause any problem but it would link all of the cylinders. It might also make a for a good source of vacuum.


Lawrenceville, GA

I mean progressive via asymmetric throttle cable wheel. Opening is small on idle and gets bigger when foot goes down. So Throttle body side cable wheel is elliptic.



Vacuum source must be smaller pipe and got restricted manifold sides, but adding right caliber tubing to idle air is thing what must be try someday.


Hyvinkää, FI

You may be able to get the kind of "progressivism" you are trying for with the cable and changing radius by changing linkage lengths and initial angle position of the arms.  You can try it graphiclly or with a CAD program.  Generally speaking the rotational change is greatest when the arm is at 90 deg to the pulling link. Since you have to "turn the corner" (the throttle shafts are parallel with the engine crankshaft and the gas peddle shaft is perpendicular to it) some kind of bell crank has to be included also and that provides more possiblities. Look at  WWW.Kinsler.com pg 68 for ideas of how to make some kinds of linkage that turns corners.  Of course you could use a Toyota electronic peddle, I hear those are working out real well!

Doug T

The Highlands, Louisville, Ky.

I must think of that, That I know for sure, electronic gas pedal is not going to my car. You would think same if you got success procent low as me.


Hyvinkää, FI

If I ever saw the intake manifold design from a 26B on a y block I would prolly go insane.  THAT would be a hotrod for my generation.  EFI and still old school

Food for thought....

have a look at the attachment.

Hmmm... System developer must had worm in his brains, but telescopic intake pipes are still awesome.



I think, MS3 can be programmed to drive stepper motor with engine speed, so we need just few more pipes and two feet bicycle braking cable...



BTW. I seriously thinked to do cylinder deactivation system like Cadillac Northstar, but then I realized the valves will overheat without fuel, so valves must be shut or open and that will be hard job to do to pushrod engines.

Then that idea went to the trashcan.


Hyvinkää, FI

Will the valves overheat? The exhaust valves don't get cooled with fuel and they don't seam to overheat. With no combustion taking place in that cylinder, it seems like the exhaust valve will be cooler. The intake might get hotter than usual but will it be to a point of overheating? I don't think it will get hotter than the coolant temperature. If it's a spike that takes place the moment the fuel is shut off, maybe it can be programed to progressively cut the fuel until the valve temperature stabilizes to the ambient temperature.

I really don't think it would overheat, if it kept opening, any more than it would if it stayed closed. It will probably be cooler if it kept opening just because there will be a constant supply of cool air moving past it.



Lawrenceville, GA

Ford Powerstroke Diesels used an electronic pedal with a Throttle Position and Idle position sensor built in.



Mark

57 Black Tbird 312/auto

Here's an interesting article. I just started reading it.



http://autospeed.com/cms/title_Cylinder-Deactivation-Reborn-Part-1/A_2618/article.html

http://autospeed.com/cms/title_Cylinder-Deactivation-Reborn-Part-2/A_2623/article.html



Google Cylinder deactivation and a lot of stuff comes up.



It looks like the main reason they leave the valves closed is to take advantage of an "air spring". I've been through several articles so far and haven't seen anything stating that leaving the valves to open and close just won't work. If anything, the "air spring" can be used every other time. I wonder if the pressure drop created by such cylinders might disrupt the air flow enough to make the system more inefficient than if it was running on all cylinders. Actually, in your one throat per cylinder setup, that would not be an issue.

An idle air control could be used to allow additional air to the deactivated cylinders to further reduce the pumping loss. since four of your throttle bodies share a common shaft. Maybe run two iacs, one to reduce pumping loss, and one to handle the four active cylinders - it can help with the transition from 8 to 4 cylinders.


Lawrenceville, GA

I dont find it anymore so maybe it was a wrong info.



So if we block cylinders 2, 3, 5, 8 to get steady run, we got one major problem. a Lambda-sensor get false readings from air springed cylinders.



I dont know, what it does if we close second bank, but when I first started my motor, I forgot electricity from right side bank, there was no fuel in that side (look how smoke comes from just driver sive at end of video)

http://s188.photobucket.com/albums/z132/Reilukaista/?action=view¤t=BadMushroomExperience-1.flv&newest=1



Four banger Y-Block?


Hyvinkää, FI