THROTTLE BODY STOP SCREW

[gaz]

Hello,

I noticed on both the 2.9 and 4.0 ohv t/b's, when the throttle body butterfly is fully open, it's not fully opened. When my machinist bored out my 4.0l t/b he mentioned it to me also.

I would like to know if there is any reason not to make be able to open 100%?

edit; please forgive the title, I was referring to the detent which keeps the butterfly from opening 100%. This may warrant some pics .)

 

[55trucker]

Theoretically then the throttle pedal is *to the floor* the throttle blade should be at max open. Do you have any carpeting/mats on the floor that would prevent the pedal from going to the floor?

 

[bobbywalter]

He is talking about the stop on the TB


It is as open as it needs be. It keeps it from inversion.

 

[Blmpkn]

Hows that 35mpg on 31"s build coming along @gaz ?

 

[Dirtman]

Hows that 35mpg on 31"s build coming along @gaz ?

I'd imagine the hamster is loosing it's mind...

 

[gaz]

Blmpkn,

Time, money and life's demands have stopped me in my tracks. I am currently balancing out the pistons/rods sets for the bottom end balance.

Unfortunately I used the BII's gas tank, pump/sender, heater blower, radiator and some brake lines, which are all $$$ and setbacks.

I still need complete harnesses and though I do have an EGR comp as a back up, I'm still hoping for a non-EGR.

I expect 30+ mpg (highway) from the 4.0L on 28.5" in the BII; the Ranger on the other hand, with the former BII's rebuilt 2.9L, I still expect 35+ mpg on 33" with the 5 sp.

 

[gaz]

bobbywalter,

I have 2 throttle bodies for this 2.9, while I am familiar with the concept of reverse vortices I am not specifically familiar with the concept of "inversion".

I am going to remove the stop in one of the T/B's and run 3-4 tanks of fuel, then install the T/B with the stop and do the same thing and see which offers better fuel economy.

 

[bobbywalter]

Blmpkn,

Time, money and life's demands have stopped me in my tracks. I am currently balancing out the pistons/rods sets for the bottom end balance.

Unfortunately I used the BII's gas tank, pump/sender, heater blower, radiator and some brake lines, which are all $$$ and setbacks.

I still need complete harnesses and though I do have an EGR comp as a back up, I'm still hoping for a non-EGR.

I expect 30+ mpg (highway) from the 4.0L on 28.5" in the BII; the Ranger on the other hand, with the former BII's rebuilt 2.9L, I still expect 35+ mpg on 33" with the 5 sp.

Hmm. Running on pump gas?

 

[gaz]

55trucker,

Bobby has me correct, it is the physical stop on the T/B that limits the butterfly from opening 100%.

 

[gaz]

Bobby,

Well, hope is currently more factual but on paper I do expect it or better .

Yes, both the 2.9L and current build 4.0L ohv use/will use only premium pump fuel.

 

[gaz]

Blmpkn,

I misunderstood, I thought that you were asking about the 4.0. After a pot of coffee and a days work it became clear that you were asking me about the 2.9L in the Ranger. Sorry about that.

I have that engine apart as it developed a coolant leak from the lower intake manifold. I'm dropping the oil and renstalling the intakes tomorrow.

This engine sat for awhile prior me removing it from the BII and installing it in the Ranger.

This is why I expect 34+ mpg:

-the Ranger made 28 mpg on it's bone stock original 2.9L
-this engine in the BII made 24 mpg towing 2,100 lbs compared to the former max mpg of 18.3 (highway, empty) before the rebuild
-the Ranger weighs 600lbs less than the BII
-the 5sp should cause less transmission loss
-the Ranger has an Accel 300+ ignition vs the BII's stock
-the Ranger's t/b is taper honed
-the cam grind is optimized for a manual

 

[bobbywalter]

Imperial gallons? And straight test no corn bullshit gas....


Yeah maybe.


What are the cam specs? Custom valve train? The port and polish work must be epic.

 

[gaz]

Bobby,

-taper honed T/B
-the intakes/heads were full race, flow bench port/polished.
-full race Multi-angle valve job
-free floating rocker arm shafts
-1.5:1 balanced rockers
-rocker arm and shaft oil orifices bored, deburred+chamfered
-Deltacam
-Accel 300+ digital ignition
-JBA headers
-0.035" head mill
-2.8l flat tops
-peened stock rods
-ARP rod bolts
-reduced weight crankshaft
-polished crank
-complete bottom end balance
-Hypertech chip
- custom single 2½" Borla side exit
-electric fan/shroud
-oil cooler, remote filter (+2 qts)

To be frank, I just do not understand the cam, I know it is the brain of the operation but relied on both my machinist and the recommendations of Deltacam. I have it jotted down somewhere but since I don't get it, I can't remember it

Pump premium (91-94 octane), US gallons

 

[gaz]

Bobby,

The cam is from Delta Cam of Tacoma Wa. It is a "full race" grind for strong midrange power.

Delta Cam #252,
205 duration @ .050 and .425 lift 112 lobe separation