The Engine
Conversion
BACKGROUND
I love
cars, all types. Over the past 25+ years I have owned 40 varied
vehicles, from a 67 Austin Healey, a ’69 GTO, to a Caprice Estate
Wagon, and a Mini Cooper, currently my "fun" car is a 1989
Volvo 744TI (turbo intercooled). At least it started out as a 744TI
but more accurately it is now a Volvord 784VC, let me explain.
I enjoy quick cars and my Volvo is no exception, to
me the term quick must include not only acceleration but also
cornering and braking. When I first got the Volvo back in 1996 the
first thing I did was address the handling by installing modified
iPd lowered springs, dropping the ride height 2", Bilstein
shocks, iPd sway bars, Brembo brakes with Ferodo pads, and
replacement of all suspension bushings. The car now handles and
stops, the next stage was to tweak the power plant. With the
installation of a VX3 cam, adjustable timing gear, increasing the
boost to 12 psi, a full 3" exhaust system, and electric cooling
fans the car really started coming to life. But good things never
last and finally the high mileage and stresses of the extra HP
resulted in a major and terminal engine failure.
A decision had to be made, do I rebuild the B230FT
with all the "trick" internals to really get some
impressive HP out of this great little engine, but at what cost? Or
do I investigate some other alternatives? After a lot of research I
finalized my decision and elected for an engine conversion, this
would involve installing a 5.0-liter Ford V8 and T5 transmission
into the Volvo. I selected the Ford engine for two main
reasons; 1) because the distributor on the 5.0-liter is located at the front of
the engine I was able to position the engine back further without
modifications to the firewall. 2) Weight, I didn’t want to alter the handling
by adding excessive weight over the front tires and the Ford drive
train only weighs about 100 lbs more than the stock Volvo. In fact
the Ford 302 weighs in at 460 pounds (stock) where as the stock
Chevy small block weighs 575 pounds (source is Dave Williams Engine
weight chart (http://www.team.net/sol/tech/engine.html).
In my
mind the best combination was a modified Ford 302.
ENGINE
Now the search would begin for a suitable engine or
donor car. I was not having a lot of luck locating a wrecked late
model Mustang, probably because there are two or three local
companies that build Cobra kit cars and they quickly latch onto any
and all available parts. During one of the numerous phone calls in
my search for an engine I found out about a local bracket racer who
was selling a sweet 302 to make way for a 351 in his Mustang. This
deserved some more investigation, I located the owner, Paul, and
quickly found out that indeed he was looking to sell his 302 to make
way for a "more powerful" 351 but this was not a stock
302. A year earlier he invested over $4000 with an experienced speed
shop to build this 302, the fresh rebuild included 10.5:1 forged
pistons with total seal rings, a CompCam, roller rockers, extensive
port and combustion chamber work, Edelbrock Performer RPM intake,
and the list goes on. Having the right pieces in an engine is one
thing but do they work together is another, well these pieces work
together, on the dyno the little 302 created 291 rear wheel HP @
6200 and 301 Ft/lbs. Torque @ 4500. On the drag strip the numbers
were equally impressive 12.2 seconds @ 115 mph for the ¼ mile. This
would make my little Volvo perk up. As a side note Paul did install
the larger 351 and clock a ¼ mile time in the low 10’s @ 135 mph
on the first run in his Mustang, just wait till it gets sorted out.
INSTALLATION
While researching I also located a company that
specializes in the Volvo / Ford conversion, Converse Engineering.
Although I knew I could easily perform the conversion myself, I
though in the interests of saving some time and having access to
information and experience would be a benefit so I decided to
"bite the bullet" and spend the money for their conversion
kit. I have to honestly say I have very mixed feelings about my
experiences with Ross at Converse engineering, he was extremely
helpful when I first contacted him, providing lots of information,
tips, and suggestions, but as I preceded into the conversion I had
difficulty reaching Ross and getting timely answers. I must clarify
a little, my conversion was not the standard conversion Ross was
accustom to, his kit is designed to transplant a late model Mustang
5.0-liter into the Volvo, here I was not using a donor car, the 302
was carbureted, and the list goes on.
It was decided that I did not require the entire
kit, items like the wiring harness to connect the Volvo and Ford
fuel injection systems would not be used so a reduced price was
negotiated and the kit ordered. I ordered the kit on March 27th,
after several calls and some worrying I was informed that on April
23 the kit was finally in the mail, almost a month to ship. When the
kit arrived I again had mixed feelings, the small box contained two
simple motor mount adapters, an upper and lower rad hose, a high
pressure power steering hose with compression fittings that join to
the stock ends, a questionable trany mount adapter, a resistor to
convert the factory 4 cylinder Volvo tach to read the 8 cylinder
impulses, and a variety of nuts, bolts, clamps, wire ties, and an
obviously edited instruction sheet with any references to fuel
injection and or wiring excluded. Not a lot for $1100+ Canadian but
again I told myself I was also investing in technical expertise…
In the meantime I spent many hours at the local
"Pick-a-Part" auto wrecker gathering all the pieces
required for the conversion. The accessories and brackets came from
a late model Lincoln, a T5 trany from an ‘89 Mustang was located
at another auto wrecker, radiator from a Volvo 760 (read on for more
information), electric fans from a Chevy Euro Sport, and the list
grew. New parts were ordered including an MSD 6AL, Edelbrock
Performer carb, motor mounts, clutch, B&M Rapid shifter, air
cleaner, and so on. I know many of you are probably asking why go
for a carb rather than fuel injection? My rational was simple, the
engine was set-up and completely outfitted for a carb, a Holley 600
double pumper was even included with the engine although it was not
in great shape and I have not had great luck with Holley’s in the
past. To properly install a fuel injection system that would match
the engine I would need an aftermarket computer, performance intake,
all the sensors, etc and all of a sudden an additional $2000 has
been added to the total. I have not ruled out fuel injection, it is
something that can be added later and besides I am from the old
school and love the sound of a 4-barrel carb singing at full
throttle. The engine was repainted from the original red to black,
the Volvo drive train was pulled, the engine wiring harness removed
and the engine bay cleaned, it was time to start the test fitting.
After installing the motor mount adapters I was
ready for the first test fit of the 302, it easily slipped into the
engine compartment, I was pleasantly surprised at the amount of room
around the engine. The instructions with the motor mount adapters
require that the alignment dowels on the motor mount be cut off so
that the mounts would sit flush on the adapters, I preferred to
drill the appropriate hole in each adapter to align with the dowel,
a simple modification, why were these holes not designed into the
adapters? After several more test fits and minor modifications on
the bare engine I installed the long-branch headers and tried
slipping the engine in, my first problem. There was ample clearance
for the headers on the right side, but the left side was another
story. Instructions with the Converse kit recommend cutting,
bending, and re-welding the right frame rail to provide clearance,
but this is for the factory "shorty" headers and this was
not required with the long-branch type. To make a very long story
short I had to bend each primary pipe on the left side header in so
the collector was repositioned in about 2.5" to clear the lower
rear strut rod, I also slotted the motor mount adapters and
relocated the engine about ¾" to the right, this provided the
necessary clearance, success at last.
TRANSMISSION
MOUNT The Converse Engineering kit includes instructions
and the adapter to mount the rear Volvo cross-member to the T5
transmission mount, but requires the cross-member to be mover
forward and reattached by only two of the original four bolts. Yes
additional bolts can be added as per the instructions but I
questioned why? I fabricated a new adapter from ¼" aluminum
plate that would bolt directly to the T5 where the original trany
mount was located and connect to the stock Volvo transmission mount
and cross-member located in their original position. The result is a
superior set-up on both the trany and cross-member. During this time
several calls were placed to Ross at Converse Engineering, I left
voice messages (when his answering machine did pick-up), I sent
e-mail, I did get a couple of my questions answered but I definitely
was not receiving the advice, expertise, knowledge, or service I was
expecting.
WIRING
The heavy work completed the drive train was now
installed and it was time to move onto the next stage, adapting the
Volvo wiring and plumbing to the new engine. In general this process
was straight forward but somewhat time consuming. The high-pressure
fuel pump was removed, the fuel pump relay wired to the ignition
rather that the tach and the neutral safety switch jumped, the
in-tank fuel pump alone provided a constant 10-psi and a regulator
was installed to limit pressure at the carb to 5 psi. The MSD
ignition, back-up lights, starter, oil pressure light and AC wiring
proceeded without any difficulties. The only problems occurred with
the alternator and separate regulator, the wiring appeared to be
simple and all connections were made, but later when the engine was
running problems arose when initially all the dash warning lights
remained on and the alternator would not charge. After many hours of
tracing wiring diagrams and testing circuits I located a small note
in a reference book at the local library that indicated that Ford
used two different regulators, one for use with an ammeter and one
for use with a warning light, they appeared identical except for the
color of the electrical connector. This ended up being the problem
since Volvo uses a warning light and voltmeter (not an ammeter), I
initially had the regulator designed for the ammeter, when this was
exchanged and wired as I originally intended everything worked as
designed.
EXHAUST
SYSTEM The exhaust system, long dreaded but required. I
usually build my own exhaust systems, my experiences at the local
muffler shops have been far less that satisfactory, shoddy work,
poor design, outrageous prices. Using Dynomax mandrel bent pieces I
welded together a dual 2½" system with two Flowmaster mufflers
that terminate through a 3" Dynomax Ultraflow. The header
collector flanges were cut off to increase ground clearance, O2
fittings installed to facilitate oxygen sensors for set-up and
calibrating the carburetor. The resulting system is quiet while
cruising but your eyes open wide under full throttle.
SHIFTER
The shifter was the next challenge, the stock
shifter utilizes a bolt on shift handle, the Converse kit includes a
simple metal plate with holes at each end to adapt the trany shifter
stub to a modified Volvo shift lever into the correct position
through the center console. I elected to use a short throw B&M
Rapid Shift but the challenge here is that the Rapid Shift uses a
one-piece handle that if used as supplied is far too short and will
hit the dash. The solution is to re-bend the Rapid Shift handle into
a very aggressive "S" this positions the end of the shift
handle into the correct location in the console. Then using a shift
lever from a Toyota Supra I cut the lever to the appropriate length,
removed the rubber isolators leaving only the hollow chrome shift
handle with the threaded shift knob end. I then machined a round
aluminum insert that I pressed into the shift handle drilled and
tapped the insert and threaded it onto the Rapid Shift handle where
the "Mustang" shift knob is intended, in essence I
fabricated an extension for the shift lever. After installing an
impressive looking shift knob the Rapid Shift modification and
installation was complete.
COOLING
To cool the 302 the stock 4-cylinder radiator had to
be replaced, Ross at Converse recommends the Volvo Diesel rad but in
my travels through the auto wreckers I located a Volvo 760. Initial
inspection indicated that the 760 rad was the same size as the
diesel rad and would be the perfect fit, even the hose connections
are in a better location than the diesel rad in that they align with
the inlet and outlet of the 302 engine in the same way as the
Mustang rad, but a warning, DO NOT USE A 760 RAD!!! The cooling
capacity of this rad is far too low and cannot cool the 302. My
final solution was to install a custom built high efficiency 3 row
radiator, this solution addresses any cooling problems and retains
the best routing for the upper and lower radiator hoses.
Horsepower creates heat, and lots of it, to pull the
cooling air through the new radiator I tested dual 15" fans
from a Chevy Euro Sport. The Converse conversion kit recommends
using a single 16" GM fan attached to the engine but I did not
want to take any chances nor did I particularly like to looks of the
single fan installation. The dual electric fans fit perfectly across
the rad and nestled in and around the accessories and drive belt
beautifully, but the electrical draw from these fans was substantial
(close to 30 Amps) and air movement through the radiator was
marginal. As a final solution I removed all the electric fans
including the original pusher fan and installed a mechanical
16" flex fan with a 2" spacer onto the water pump. This
proved to be the best solution as coolant temperatures dropped an
additional 15° and eliminated the large
electrical draw on the system.
I was very concerned with the temperature sending
unit "adapter" included with the kit. The Volvo
temperature-sending unit uses a straight thread and a machined
tapered flange type seat seal where as the 302 uses a standard
tapered pipe thread. The "adapter" is simply a copper
washer that is supposed to seal the top of the Volvo sending unit at
the intake. The two threads are very different pitches and diameters
and I could foresee that this seal would fail at the most
inopportune time, a true problem waiting to happen. The answer is
simple with the installation of an aftermarket temperature gauge,
and an oil pressure gauge while I was at it.
Since this is a daily driver and I do like some
comforts, especially at my age, so I retained the air conditioning.
Again the kit includes splices and instructions to join the Ford AC
lines to the Volvo AC lines, although this may be satisfactory I
decided to ensure reliability and maintain the under hood appearance
by getting custom AC lines built, yes an additional expense but why
cut corners now.
CONCLUSION
There are many more details that I will not bore you
with but in total the conversion from start to finish took about 120
hours. Now that I have the car running I can honestly say it was
worth all the time, trouble, and expense. Cost wise I believe there
would have been very little difference between this conversion and
building a moderate performance B230ft, but with this conversion I
have something different, and people do notice. I don’t know if I
would use the Converse kit next time, I would consider it if I were
doing a complete 5.0-liter fuel injected transplant but the
difficulties I experienced in shipping, the number of modifications
and changes I made, and the difficulties contacting Ross is a
definite concern. As a final note I started off by referring to my
car as a Volvord 784VC, that is combining Volvo Ford, 700
series, 8 cylinder, 4 door, V type engine, carbureted, imagine what
they are thinking in Gothenburg.
Top of
Page
|
Home
The
Conversion
Specifications
Pictures
Technical
Articles
Links
E-Mail
|