Matt16

I fitted a York OBA system recently. Here it is:

Compressor: Full-sized York off a Volvo (I think, I bought it from a guy who had it in the garage)
Bracket: Adapted from a 22RE A/C bracket, you need a sort of spacer as well
Air lines: 3/8"
Air tank: Air brake tank off a Ford dump truck (note: not a dumpy Ford truck)
Valves switches etc: One-way into the tank, 150psi pressure release valve, drain valve, 90psi on/120psi off

Description:

• York is belt driven off the engine in place of the stock AC pump (you can't install the York like I have with AC)
• pressured air goes down the air line, through the one way valve
• pump has a magnetic clutch that is activated by a relay
• relay is only thrown when:
  a) the day-time runnning lights are ON (always on when engine is running (Canadian spec)
  b) the switch in the engine bay next to the quick disconnect is ON
  c) pressure is below 90psi.
• air tank link to quick disconnect zip-tied near battery
• fills up a 31" tire from ~5 to 35psi in ~30 seconds at 2500rpm

cost estimate

• York compressor...................<$50
• 22RE A/C bracket....................$30
• 25' air hose, cut inot pieces......$15
• NPT fittings............................$50
• air brake tank........................$50
• air filter, pressure valves.........$40
• electrical bits.........................$50
• TOTAL................................~$300 (based on what I actually spent)
• Knowing your compressor pumps out 10X more air and costs less than half of the guys with a Viair....Priceless

more info: https://www.yotatech.com/forums/f116...r-22re-152143/


Here's the measurements on the bracket.




Input & output, blow-off valve (150 psi), and on/off pressure switch (80psi-ON/ 120 OFF)









I secured the bracket to the body of the truck.

littlecommando

looks good, i have been thinking about doing this too
do you still have A/C even with the air compressor?

Matt16

No, I never had AC, just bought the bracket. The York sits where the stock AC would. You would have come up with a complex bracket to make a York work with AC, but I'm sure someone has done it, try searching Pirate BB.

scuba

You bought a guy ???

lol

lookin good matt, congrats

littlecommando

is this just a trail rig or do you just just suffer through the heat every day?

Matt16

Someone's got to grease my muffler bearings, and that someone ain't gonna be me.

Matt16

It's my daily driver. With the windows down, its never too hot in the truck. I'm also in Canada, so heats only an issue from June to August, and even then the hottest I ever remember is 35*C (95*F)

Alex 400

did how do you hold it at 2500 rpm? did you make any kind of throttle holder mechanism or anything?


something like this...

http://www.madisonpowersystems.com/1...s/throttle.htm

littlecommando

that makes since, why bother fixing it for 2 months a year, right?

Matt16

I never had AC to start with. I went to a wrecker, bought the AC bracket, used a tap to clean out the thread on the block, and then built a spacer bracket to fit on the AC bracket.

littlecommando

I didnt even know that no A/C was even an option
i guss thats a canadan thing?

Alex 400

well the sr5 like you and i have, were the top of line (next to the limited) and they came with A/C I don't believe the base models came with it.

Jay351

A/C was always an option...

Looks good Matt, OBA is awsume, hopfally I can rig something up in my truck in the future..

Snotrocket

My truck never had it either. There are a lot of base model Toyota's around here that don't have it. I can only think of one day all summer I wish I had it. Heat on the other hand........




What is the compressor out of exactly? I've got 3 old Volvo's kicking around.....

JasonWin

My 1985 SR5 doesn't have A/C, and I'm pretty sure it never did, nothing on the dash to sudjest it did.

Matt16

Oddly, I have an SR5, but no AC. I doubt I'd use it that much though, so I don't miss it.

Matt16

Yeah, sounds, good. I just need to find a free day. I really want to check out the West Harrison.

Matt16

Oh yeah, I thought this York would cause the revs to fall low at idle, but that doesn't seem to be the case. That said a hand throttle to keep the idle at 2500 while filling up the tires would be nice, but a rock propped against the gas pedal works for now.

EDIT:
I just tested out air tools. The air drill needs the throttle to be bumped up a little. The impact does fine at idle.

locked stock 84

Ok, so a few questions...
How do you have it wired?
Where did you get the pressure switches?
Did you run a master switch in the dash?
Did you run a press guage to the dash?
Did you filter the inlet air to the compressor?
Is that tensioner stock for A/C?
What size belt did you use?
Thanks for the write up!

Matt16

The wiring goes as follows:
A fused wire leaves the battery and goes through a relay and to the wire coming out of the compressor. To throw the relay current is drawn from the daytime running light wire (in cab, under ash tray), that way there is no way that the magnetic clutch on the compressor can draw power when the engine is not running. The it travels to a switch I mounted in the engine bay, then back to the pressure switch (80psi on, 120psi off), then to ground. To throw the relay, the pressure in the tank must me <80psi, the engine must be running and the switch must be thrown.

I got the pressure switch from a big tool store (KMS tools, in Burnaby, BC), but they should be available at most tool stores.

No master switch in the dash. I already have lots of aux. light switches and its getting confusing. Besides, I always check the engine (oil, coolant, rattles etc any time after off pavement travel. Can't imagine a situation where I'd need the hood closed (ie: driving) but still need the compressor. If I had air lockers, I'd tap into the reservoir tank.

Yes, I used a filter. Used a breather meant for a large V8 or something, it was intended for used as a crank case breather I think. It was $20, and the fit was perfect. I was going to tap into the airbox, but the brass fittings were more expensive than the breather. I think I will relocate the intake higher, but the compressor is unlikely ever to be running during a water crossing, unless I accidentally left it on and the water cooled the air tank, decreasing the pressure in the tank and throwing the circuit- that would be bad, but unlikely.



Yes, the AC bracket has a tensionner. The only thing I needed to make, was the adapter plate. I got scrap metal from fabrication shops, and welded it myself at my old highschool. I've never welded before, and MIG is easy.

3/8" belt? I think. Same width as the other belts. Fits the cranks and the York just fine. The belt looks brand new.