Just a little more . . . . .

How to make it go fast

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Re: Just a little more . . . . .

Postby oldestof11 » Wed May 02, 2018 7:07 pm

We push a lot of fuel into the inlet but there's a bit room for improvement right at the inlet.

It has been a couple years so bear with me.

The inlet is a 3/8" or -6AN fitting size. I think it has enough meat for a -8AN or 1/2". Since it uses a AN adapter, I think it is possible to up the size. This allows more volume to the vane pump. I have a theory we are pushing enough fuel at low RPM's the vane pump is cavitating or even going dry. We noticed by pushing more pressure, the pump and case pressure reacts better. Could it be pushing enough fuel trying to keep up with the H&R that the bottle neck right before it is causing issues?

2nd spot to massage is the passage up to the FSS in the head. I remember enlarging that part to the point there were no ridges for the springs. There was still 3/4 of the pocket left to make sure the springs seated and stayed seated. This also doesn't affect the uses of the FSS plunger or the timing as dictated by the slot of the rotor collar in the head. So now instead of around 25-30mm of passage at, say, 5mm diameter, you have it now at 7mm, or a 40% increase in flow. I remember going 2 steps up on the drill bit selection I had.

Now, if you wanna get ballsy, press the rotor collar out of the head and take that same size through the head to where the collar would be. Time and press the collar back in. Now that 90* turn has less affect on flow being restricted. Yes, it is still a restriction but you made the passages bigger. And the 5-6mm for the collar thickness will have less impact than the additional 4-5mm from the FSS to collar.

One area needing addressed and I haven't quite figured out yet is the return flow. It is not a regulator, it is just fixed orifice. Maybe putting a regulator on it with a 1:1 boost reference would help choke the flow so less is returned during high impact use.

I hope this all makes sense.
Jon
93 D250~ Mismatch of cheap parts, trying to look fast going slow
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Re: Just a little more . . . . .

Postby 79Powerwagon » Thu May 03, 2018 10:04 am

With regards to the inlet, i noticed the threaded hole on the bottom of the VE (near lower mounting hole) heads right up into the bottom of the vane pump inlet.

If one could come up with a banjo fitting to clear the lower stud it may be an option for a second feed.

I read somewhere that a guy calculated the vane pump is more than capable of supplying enough fuel, could be an issue with supply to the vane pump?
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Re: Just a little more . . . . .

Postby BC847 » Mon May 07, 2018 7:18 pm

I'm reading . . . . . up to my ears looking a drain right now . . . . . . :shock:
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1993 12mm VE Fueled W250 CC, Green
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Re: Just a little more . . . . .

Postby spencerdiesel » Sat Jan 05, 2019 11:48 am

Any updates or more 1/8 miles passes done this past year BC?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 6x10 VCO sticks, THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw 2 turns in, timing to the head/ >1/4”
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Re: Just a little more . . . . .

Postby BC847 » Mon Jan 07, 2019 6:33 pm

Meh, . . . life . . .

With the trans wanting to shift weird at WOT, I'm not gonna push my luck and hurt it.

- Had to get an 8' bush-hog, . . . and it wasn't a cheap one.
- Installed a new heat-pump for the other daughter.
- Installed a 60a electric service in the boy's shop with LED lights and a 5kw unit heater.

In the meantime, I've been gathering parts so that, with harvesting the rotating assembly out of the current trans, I can build a custom 48RH trans. Still got to nail-down the 3-disc Suncoast converter.

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David

1993 12mm VE Fueled W250 CC, Green
12.67 @ 103.35
Your basic farm truck ;)
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Re: Just a little more . . . . .

Postby BC847 » Tue Jun 18, 2019 7:08 pm

For the record, I've done nothing but drive the thing to the county landfill and beach place for the most part since my last post.

Still saving for a custom converter. Thinking of a triple-disc simply for the possible longevity compared to a single-disc considering how I drive the heap.

I'd be lying if I said I can still carry on like a 20, err . . 40 year old fella. I'm blessed that I work with a company that recognizes the increasing limitations of the more seasoned employees. With that, I work short days for the most part.
With the Wifes' Moms' passing, she inherited the property I've been on for the last 27 or so years. . . . . AND the *#@@(*!! mortgage payment that comes with it!
As such, RaceTruck funding is way down.

I'm further blessed that my Son is, by his own motivation, stepping up to lend me a hand here recently. Looking forward to me getting off my ass and getting a move on.
David

1993 12mm VE Fueled W250 CC, Green
12.67 @ 103.35
Your basic farm truck ;)
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Re: Just a little more . . . . .

Postby BC847 » Sun Oct 13, 2019 5:50 pm

Well. I thought I used Spicer LifeTime non-serviceable universal-joints in the driveshafts.

I thought wrong. :roll:

So, now I gotta fix it . . . .

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David

1993 12mm VE Fueled W250 CC, Green
12.67 @ 103.35
Your basic farm truck ;)
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Re: Just a little more . . . . .

Postby BC847 » Tue Oct 15, 2019 7:33 pm

Relieving stress risers.

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David

1993 12mm VE Fueled W250 CC, Green
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Re: Just a little more . . . . .

Postby dazedandconfused » Wed Oct 16, 2019 3:08 am

Going 47rh?
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Re: Just a little more . . . . .

Postby BC847 » Wed Oct 16, 2019 10:38 am

48RH. ;)
David

1993 12mm VE Fueled W250 CC, Green
12.67 @ 103.35
Your basic farm truck ;)
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Re: Just a little more . . . . .

Postby ofelas » Wed Oct 16, 2019 11:34 am

May as well make it a 49.5RH ;)

How're the converter & shift points working out btw?
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Re: Just a little more . . . . .

Postby BC847 » Wed Oct 16, 2019 2:04 pm

Ah, I'm starting from scratch/stock thus far on this valve-body. Maybe raising the shift points to that of a 24v. Not sure atm.

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For the record (stock/OEM).

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David

1993 12mm VE Fueled W250 CC, Green
12.67 @ 103.35
Your basic farm truck ;)
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Re: Just a little more . . . . .

Postby BC847 » Thu Oct 17, 2019 7:04 pm

Buying a so-called "Rebuilt", "Reconditioned", "Renewed" transmission valve-body from somewhere you're not that familiar with?

Make damned-sure you check it out thoroughly!

Image




Otherwise: Disassembled, cleaned, inspected, "adjusted", reassembled and red'ta go.

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David

1993 12mm VE Fueled W250 CC, Green
12.67 @ 103.35
Your basic farm truck ;)
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Re: Just a little more . . . . .

Postby BC847 » Sat Oct 19, 2019 4:18 pm

There. It's out.

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David

1993 12mm VE Fueled W250 CC, Green
12.67 @ 103.35
Your basic farm truck ;)
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Re: Just a little more . . . . .

Postby BC847 » Sun Oct 20, 2019 5:56 pm

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David

1993 12mm VE Fueled W250 CC, Green
12.67 @ 103.35
Your basic farm truck ;)
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