If you frequent a few of the popular rockcrawling
forums on the web, you’ve probably run into Wayne Coatney or
“PYRO” as he may be better known. You also know
he’s one of the most helpful 4 wheelers out there. He’s
always got very helpful technical advise, right down to the part
number and common places to find what you need. What you may not
know about Wayne is that, behind his helpful demeanor, you’ll
find he’s got some serious fabrication talent that he and the
Big Island Rock Crawlers ( his shop in Kailua-Kona Hawaii) have
applied to his 77’ CJ-5. Whatever they’ve been putting
in the coffee there in Kona ( know world wide for its coffee), its
worked 2 times at the Hawaii Top Truck Challenge. The Pyro Jeep won
the top honors in 2001, in 2002 and almost again in 2003 but un
clearly stated rules appear to have thwarted a 3-peat.
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A stout chevy 400 bored to 421 running on propane,
with optional NOS boost. Its enough to make a grown man cry.
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So what makes this competition rig work so well?
Lets just start with the motor which is a Chevey small block 400 (4
bolt main) which has been bored and stroked to a 421! The mill was
stuffed with a forged crank and pistons, H-beam rods, and a Crane
cam shaft with roller rockers. Wayne uses a MSD Distributor, coil
and controller to fine tune the motor. But thats just the start.
This rig runs on a Impco Propane induction system. This mod allows
the rig run upside down or at any angle it could possible get into.
That wasn’t enough though. Wayne had to take things just that
much further with a Victor Jr. Manifold which has been modified for
NOS. Yes, thats right, this 421 has Nitrous system jetted for a
200hp shot, which is managed by a Jacobs Mastermind control. With
that in mind, i’m surprised NASA hasn’t stolen
Wayne’s rig and used it as the new Space Shuttle
replacement.
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The 14 bolt rear with disk brakes, steering brakes,
5.13 gears, and a detroit locker. Also notice the Winch used as an
adjustable limiting strap. Trick! Wayne also intends to build a
rear steer set up in the near future!
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The transmission chosen to handle all those ponies
was a SM465 4 speed with a LUK clutch. This puts the power to a
Advanced Adapters Atlas II with the 4.3 gears and 32 spline outputs
front and back. The front drive shaft is a 1350 CV with square
receiver hitch tubing going to a rare 1410 yoke on the front axle.
The rear shaft of choice was a High Angle Driveline 1480 CV thats
capable of a 80 degree angle. This shaft has a 6” slip in it
to handle the insane travel of this CJ. The rear yoke used was a
1450 attached to his 14 bolt axle borrowed from a 2 ton dually tow
truck.
The 14 bolt has been upgraded
with disc brakes, steering brakes, 5.13 gears and a detroit locker.
It was then shaved a massive 1.25” for extreme clearance
where even the ring gear got a little removed. The front end is a
Dana 60 with CTM u-joints, matching 5.13 gears, detroit locker,
Dana 70 outer stub axles (35 spline), and Warn drive flanges for
brutal strength. The steering set up is a hydro assist done behind
the axle by way of custom steering arms by “Ant.” A
steering set up like this is needed to push around 42x14.5 Swampers
on dual beadlocked hummer rims.
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This Dana 60 is ready for some
serious abuse with CTM u-joints, 5.13 gears, 70 outer stub shafts,
and a detroit locker. Notice the steering is behind the axle and
less prone to getting hit. This rig was built with competition in
mind.
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Now the suspension is stock 77’ Jeep parts.
Yea right, I think the Hawaii Top Truck contenders all wish so
though. I’ve been told that the only factory jeep parts on
the entire rig are the steering shaft and a 5 inch section of the
frame rail.
The suspension on the front
actually is a outboard spring over with 50” long Alcan
springs. The whole front suspension was moved forward 4” to
increase the wheel base. The rear suspension is a double tri, 4
link with 2”x.25” walled DOM tubing for the links and
stout 1.25” rod ends. The rear springs used are Alcan 1/4
elliptical springs. The total wheelbase for this rig is 99”
from hub to hub. More custom work is seen here in that a Warn
MX6000 winch is mounted on the back and is often used as an
adjustable limiting strap. Pretty trick if you ask
me.
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This is what has the competition running for cover,
endless travel suspension!
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Other mods include a nice new Red paint job, and a
Warn 8274 winch is used up front in the unlikely event that this
rig should some how get stuck. Also, a full cage (and some frame)
made of 1.75” DOM tube has been created to lighten and
strengthen up the rig.
Wayne and the Big
Island Rock Crawlers sure know how to set up a sweet rig. Not only
does this rig see some competition use, but its primarily
Wayne’s weekend toy where he takes the, what we’ll call
a CJ-5 on steroids, to local lava flows for fun!
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Check out the fun terrain! No
wonder they call Hawaii paradise! I hear the Lava rock is hard on
tires though.
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Nice crawl of a near vertical slab
of a lava flow!
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Wayne would like to thank a few of his sponsors
that have made such an
awesome rig possible.
- Big Island Rock Crawlers
- Dave @ Poly Performance
- Tim & Chris @ Crane High Clearance
- "Axle Jack" @ CTM
- Parts Mike
- Scott @ RockStomper
- Donny's 4 Wheel Drive World
- Pacific Motor Sports
- OTT Steering
- And, Bubba Burgers!
We at Off-Road.com
would like to thank Wayne for his time and we wish you luck at the
2004 Hawaii Top Truck Challenge!
Look to
Off-Road.com for more great Featured Rigs every month!
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