Author Topic: 86 F250  (Read 1094 times)

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Mudder

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86 F250
« on: Jan 22, 2018, 06:46:31 PM »
Well I wanted to document this somewhere. Working on building up a 1986 F250HD 2wd for towing. My Grandfather bought it new in 1986 and it has about 84,000 miles on it. It's pretty close to stock apparence, my current use is a 32' fifth wheel and daily driving. Current specs are as follows

460
C6
3.55 gears
Lunati voodoo 256/262 camshaft
Rhodes variable duration lifters
Holley sniper TBI
True dual 2.5" exhaust
Hedman headers

Future plans include:
Torqstorm supercharger
Gear vendors O/D unit
4.10's






Mudder [OP]

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Re: 86 F250
« Reply #1 on: Jan 22, 2018, 06:52:14 PM »
Here's a few more.




Crocks

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Re: 86 F250
« Reply #2 on: Jan 22, 2018, 07:43:35 PM »
Grandpa's sleeper. Definitely interested. Glad to see someone still utlizing old school big block toque gallon per mile technology. Speaking of which, what kind of mpgs you getting towing the fifth wheel?
Shambs old 85 runner http://board.marlincrawler.com/index.php?topic=52566.0
Since I've added, ARP knuckle studs, MC short throw, MC dual case mount. Arb front locker. Arb twin compressor, new rear seats and carpet

Mudder [OP]

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Re: 86 F250
« Reply #3 on: Jan 22, 2018, 08:06:50 PM »
Around 5. That's the reason for wanting the 4.10's, a supercharger and a GV O/D unit. HOping to get it around 8 or 9 towing and into the 13's for DDing. Yes I know, boost can decrease MPG's if you drive with a lead foot but most of the reason why my MPG were so low is towing it up hills and having to be close to WOT.

Crocks

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Re: 86 F250
« Reply #4 on: Jan 22, 2018, 08:22:04 PM »
At work my boss owns a 98 Chevy,  4x4 3500 dually, 454 with Whipple charger. 4.10 gears with gm posi. All ordered from factory dealership when new. Now's has 210k. Tows a 38ft 5th wheel loaded with roughly 6,000lbs  worth of display motors and parts. Over mountains n canyons avg is 6 mpg with a steady tow, 10mpg not hauling
Shambs old 85 runner http://board.marlincrawler.com/index.php?topic=52566.0
Since I've added, ARP knuckle studs, MC short throw, MC dual case mount. Arb front locker. Arb twin compressor, new rear seats and carpet

redneckcustoms13

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Re: 86 F250
« Reply #5 on: Jan 23, 2018, 08:12:54 AM »
Cool project. My vote is 12v if you want to actually tow with it for king distances. Big blocks are cool for power and tq but lo mg hauling they kill the pocket book. I'm biased though.
80 short bed, longs, hi steer, 4.7 case twin stick, 4.11, 38 tsl, mild built 22r
83 long bed, sas, hi steer, 3rz, w56, 4.56 33s
95 4runner project
06 4 door tacoma street truck

Mudder [OP]

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Re: 86 F250
« Reply #6 on: Jan 23, 2018, 09:07:48 AM »
If it wasn't for this being all original and in my family since new I would do a swap to a diesel. I've also thought about going with an old Ford 6.9 and turboing it.

redneckcustoms13

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Re: 86 F250
« Reply #7 on: Jan 23, 2018, 06:45:29 PM »
A guy local to me actually did that with one of those gutless wonders. It was an improvement but still wasn't as much as a stock 6.5 turd gm produced. That's why I stick with 12v for diesel swap.

That 460 should be quite a red light to red light sleeper with that cam shaft and rocker combo.
80 short bed, longs, hi steer, 4.7 case twin stick, 4.11, 38 tsl, mild built 22r
83 long bed, sas, hi steer, 3rz, w56, 4.56 33s
95 4runner project
06 4 door tacoma street truck

Mudder [OP]

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Re: 86 F250
« Reply #8 on: Jan 23, 2018, 07:49:44 PM »
At work my boss owns a 98 Chevy,  4x4 3500 dually, 454 with Whipple charger. 4.10 gears with gm posi. All ordered from factory dealership when new. Now's has 210k. Tows a 38ft 5th wheel loaded with roughly 6,000lbs  worth of display motors and parts. Over mountains n canyons avg is 6 mpg with a steady tow, 10mpg not hauling

My goals may be a little bit to high, but it'll be nice to get over 8 mpg in town 10 on the freeway.

This 460 does have plenty of power for everyday use, I'm hoping to recurve the dizzy this weekend yo help my timing out.

Mudder [OP]

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Re: 86 F250
« Reply #9 on: Jan 27, 2018, 07:11:20 PM »
Got the rear tank fixed. Ended up being a kinked line that was causing not enough fuel to flow. Tomorrow's goal is to get a new alternator in. Driving today with A.C. and lights on my carve was 12.7.

Mudder [OP]

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Re: 86 F250
« Reply #10 on: Feb 09, 2018, 05:52:37 PM »
Finally took care of the transmission pan leak. Talk about a PITA as there is no drain plug on the pan but after dropping it I found a decent size piece of a snap ring in there. Looks like it's time to save up for a gearstar transmission at a little bit over 4k. I feel like this is needed with my goals of supercharging and maybe even rebuilding the engine one day to have around 700 HP.


THK Matt

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Re: 86 F250
« Reply #11 on: Feb 14, 2018, 10:37:46 AM »
:popcorn:
1996 Jeep ZJ Laredo Daily/Weekend Wheeler
5.2L V8, 44RE, NP249, 33X12.50R15 Goodyear MTs on Black Steelies, 5.5in Iron Rock Off Road Critical Path F/R

1995 Jeep ZJTotaled by a semi

2005 Dodge Durango Limited 5.7L Hemi Wife's Daily

Instagram @ taytershubby13

Mudder [OP]

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Re: 86 F250
« Reply #12 on: Feb 21, 2018, 05:10:14 PM »
The rear tank kept having problems, so I pulled it out and looked at everything. I'm replacing the old nylon 3/8" feed line with some Earls Vapor Guard from the sniper kit. It's built for the purpose of withstanding the modern-day gas.

I know what exhaust shop I'll never do business with again. They routed the exhaust under the sides of the gas tank which required me to drop it all the way back at the headers as they also welded it all together from the header back which also means I can never pull it unless I cut the exhaust. They also welded the handers to the tubes. They also missed an easy weld spot and honestly, I'm pretty disappointed as I paid close to 1k for all this work and even I'm ashamed of the welds.






I'm hoping this is my problem, a new one will be here tomorrow and I'll finish the reinstall of everything

redneckcustoms13

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Re: 86 F250
« Reply #13 on: Feb 21, 2018, 07:31:03 PM »
Dang buddy, i hate to hear how shotty the work is on the exhaust system. Especially with how much it cost you. Hopefully your fuel line upgrade and a new connection will cure the issue.
80 short bed, longs, hi steer, 4.7 case twin stick, 4.11, 38 tsl, mild built 22r
83 long bed, sas, hi steer, 3rz, w56, 4.56 33s
95 4runner project
06 4 door tacoma street truck

300k

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Re: 86 F250
« Reply #14 on: Feb 21, 2018, 08:15:24 PM »
wow. one of the prior owners/meth connoisseurs that owned my truck before me did a better job on the exhaust. Hope you bring it up to the offending shop
« Last Edit: Feb 21, 2018, 08:45:27 PM by 300k »
Keep it TOYOTA!

In the past years, I used to get a lot of calls from Jeep owners wanting to go slow like the Toy trucks.

Mudder [OP]

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Re: 86 F250
« Reply #15 on: Feb 22, 2018, 07:33:29 PM »
I finished up the reinstall, don't have any photos of that though. I'm still pretty annoyed but as I looked at it tonight they didn't have much routing wise when going under the gas tank but if they hadn't welded the hangers it would've been an easy solution. I'm hoping to gt this truck on a Dyno next month just to crush my hopes and dreams of it being a decent motor.

redneckcustoms13

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Re: 86 F250
« Reply #16 on: Feb 22, 2018, 08:08:21 PM »
Cummins swap time. :thumbs:

So what is it that has you annoyed about the fuel system?
Would you consider an aluminum intake manifold before doing the dyno pull? I know if I ever start poking around on my 360 it will become a 500hp $5000 rebuild. Therefore i have refrained from such silliness.
80 short bed, longs, hi steer, 4.7 case twin stick, 4.11, 38 tsl, mild built 22r
83 long bed, sas, hi steer, 3rz, w56, 4.56 33s
95 4runner project
06 4 door tacoma street truck

Mudder [OP]

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Re: 86 F250
« Reply #17 on: Feb 22, 2018, 08:28:33 PM »
Cummins swap time. :thumbs:

So what is it that has you annoyed about the fuel system?
Would you consider an aluminum intake manifold before doing the dyno pull? I know if I ever start poking around on my 360 it will become a 500hp $5000 rebuild. Therefore i have refrained from such silliness.

Haha a Cummins will not be going in sadly. I love diesel motors but to me a big block is cooler  :gap:

The rear gas tank has caused me problems after installing the sniper efi. Sometimes at idle it'll just die or the middle will go from 1500 to 500 due to a fuel flow issue which is why I dropped the tank to look at the pump and install a new fuel line hoping it solves it as the old one has some problems.

I may go with a weiand stealth intake in the future but right now the stock iron is working great. A supercharger is only 3k for this motor which is why I'm going that route of over a rebuild at the moment. If anything happens to the motor I'll go all out with aluminum heads, better crank rods and piston new intake full MSD ignition (I already have it but I had how it looks with the wiring not looking OEM) and a new fuel system with intank pumps. I was hoping this build would move faster but I'm in stand by mode with my job.

redneckcustoms13

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Re: 86 F250
« Reply #18 on: Feb 22, 2018, 08:31:59 PM »
So you have 3 pumps correct? The one on the frame is drawing through the in tanks and they are "helping" supply it?
80 short bed, longs, hi steer, 4.7 case twin stick, 4.11, 38 tsl, mild built 22r
83 long bed, sas, hi steer, 3rz, w56, 4.56 33s
95 4runner project
06 4 door tacoma street truck

Mudder [OP]

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Re: 86 F250
« Reply #19 on: Feb 22, 2018, 08:45:17 PM »
So you have 3 pumps correct? The one on the frame is drawing through the in tanks and they are "helping" supply it?

Yes, the factory low pressure intank pumps feeding a high pressure frame rail. I've had zero problems woth the front tank. The fuel pump is new and still in great shape with no cracks in the short line on the pump.

What I'm thinking was happening was the old line had some bends and kinks in it so I believe the pump was starting to over heat, boil the fuel as I could hear something like boiling going on back there and was causing some problems.

redneckcustoms13

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Re: 86 F250
« Reply #20 on: Feb 22, 2018, 08:47:17 PM »
Is there a way that the valving between the two tanks could be causing this issue? How is the tank vent?
80 short bed, longs, hi steer, 4.7 case twin stick, 4.11, 38 tsl, mild built 22r
83 long bed, sas, hi steer, 3rz, w56, 4.56 33s
95 4runner project
06 4 door tacoma street truck

Mudder [OP]

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Re: 86 F250
« Reply #21 on: Mar 07, 2018, 12:09:27 PM »
Rear tank is still causing problems so my goal is to just go high pressure intake fuel pumps but that'll be a while. Got sent to Nebraska for a job for probably 8 weeks at least.

Mudder [OP]

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Re: 86 F250
« Reply #22 on: Apr 02, 2018, 04:11:15 PM »
DOn't have any pictures but I did install some Dynapad and Dynamat extreme in the truck along with a single 12" rockford fosgate sub. I also dropped the rear tank again and changed out the fuel pumps, turns out in 87 they went to a 12v DC turbine with only 4.4-8.7 PSI / 31.7-42.3 GPH for fuel flow while the 86 is a 12v DC centrifugal with 6 - 9 PSI; 54.1 - 63.4 GPH fuel flow. The only problem with this is everyone makes a fuel pump for a plastic rear tank that is a 3 prong not for the steel rear with the 4 prong oval shape so I found out that Spectra Premium FG114A is the correct style sending unit and just put the correct year of fuel pump on. It seems to have fixed the problem but I haven't gotten the drive time on it yet due to being sent out again.

redneckcustoms13

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Re: 86 F250
« Reply #23 on: Apr 02, 2018, 04:20:51 PM »
Good find. I like seeing this tid bits of knowledge about older American built vehicles. I've found a lot of things different in an 84 dodge and 92 dodge. Even though the body and frame are relatively the same from 71-93 ???
80 short bed, longs, hi steer, 4.7 case twin stick, 4.11, 38 tsl, mild built 22r
83 long bed, sas, hi steer, 3rz, w56, 4.56 33s
95 4runner project
06 4 door tacoma street truck

Mudder [OP]

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Re: 86 F250
« Reply #24 on: Apr 05, 2018, 06:08:21 PM »
Good find. I like seeing this tid bits of knowledge about older American built vehicles. I've found a lot of things different in an 84 dodge and 92 dodge. Even though the body and frame are relatively the same from 71-93 ???

Sometimes I wish that my grandfather had waited 2 years or bought one 2 years earlier to not have to deal with the whole change over year crap bt at the same time I enjoy the challenge to figure out what actually works and what doesn't.

Mudder [OP]

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Re: 86 F250
« Reply #25 on: Apr 13, 2018, 09:16:32 PM »
As much as I hated to do it the Holley 750 is back on. I didn't trust the Sniper EFI to take me long distance due to the rear tank still not working correctly. I also didn't enjoy my loss in MPG. I actually went from 8 to 6 for town driving. The Sniper may go back one when I have the time to pay someone to install it and fix the little issues as I don't have the time or space at the moment. I'll have some pictures tomorrow.

Mudder [OP]

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Re: 86 F250
« Reply #26 on: Apr 28, 2018, 02:27:59 PM »
I'm pretty terrible at updating this. After removing the sniper EFI my rear tank wouldn't work, what I believe happened was the sniper efi pump messed up something inside the changeover valve that wouldn't allow fuel to pass through as it just wouldn't change to the rear tank to allow fuel to pass through, but it would change over to that pump. $307 later and a new one is in. Here's the pictures of the sub and the Holley carb back on.

What annoys me is with this carb I'm getting .5 mpg better, the best I ever got with the Sniper was 6 and with this carb back on it's been gave me 6.5. That is with the fuel bowls boiling due to it being 80 degrees outside and no plater between the cast iron intake, running in the 10's for AFR at WOT cruising in the 12's and who knows what idle is as I haven't tuned it up again. But overall it does run better IMO.

With all the in mind my current plans are:
Proform metering blocks so I can adjust the IFR's and PVR's
Tap the idle air bleeds and high-speed air bleeds so I can change them
Buy this https://www.holley.com/products/fuel_systems/carburetor_components/adapters_and_spacers/parts/300-4013QFT
Change out those damn spark plug wires for ones that aren't so freaking long that I have to put them in coils as it makes the engine bay look more like crap.
Also order one of these, sometimes it sucks not having a cup holder http://www.cupholdersplus.com/bench-seat-cruiser-console.html


« Last Edit: Apr 28, 2018, 02:39:48 PM by Mudder »

:)bestgen4runner

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Re: 86 F250
« Reply #27 on: Apr 28, 2018, 05:27:58 PM »
 :popcorn:
I am 1/5th of Perfect Fit
SqWADoosh [04:19 PM]: *sigh* I guess Chris is right and I just need to wait until I'm in a place where I have a tow rig and trailer before I get this caliber of truck
Mudder [08:28 PM]:   not try to be a jerk, but are you serious bestgen?
Prismo [06:11 PM]:   Done, time to relax or as Bestgen says....FREEDOM!
HogCanyonHopper [06:54 PM]:   I like my little rod. it gets the job done
H8PVMNT [03:30 PM]: I can go both ways.

redneckcustoms13

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Re: 86 F250
« Reply #28 on: Apr 30, 2018, 07:11:06 AM »
When you get that cup holder please take some pictures of it for me. Looks like what I need for the 84. I have read bad things about the sniper efi and how it compares to fitech. What size carb is that?
80 short bed, longs, hi steer, 4.7 case twin stick, 4.11, 38 tsl, mild built 22r
83 long bed, sas, hi steer, 3rz, w56, 4.56 33s
95 4runner project
06 4 door tacoma street truck

Mudder [OP]

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Re: 86 F250
« Reply #29 on: Apr 30, 2018, 10:33:03 AM »
When you get that cup holder please take some pictures of it for me. Looks like what I need for the 84. I have read bad things about the sniper efi and how it compares to fitech. What size carb is that?

I think the problem with the Sniper is that it's set up for performance and the only way to truly adjust it is using with sniper efi software, which even with reading the help guide and doing research I was never able to truly figure out. I don't think the Sniper is bad, just with my setup it didn't work as well as I had hoped. The carb is a Holley 750 woth vac secondaries and an electric choke. I changed it to a 4150 over a 4160 style so I could have the rear metering block.

 
 
 
 
 

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