PaulD
Paul Davock
Dr. Jeff has been asking for a description of my 1603 engine build, so I guess it is time to do it,
The intent for this engine was to take advantage of the increased stroke and aim for maximum torque across a broad RPM range. I will use as many pictures as possible.
Block: 14 bolt, drilled for 12mm head studs, allign bored, bored for 87mm pistons, decked to provide 10.3 to 1 compression ratio (94 octane gas)
Crank 64.7 mm Tipo 1600.
87mm Wiseco custom forged pistons, with a dished top (for better squish and flame propagation)
Crowder rods (these rods are 60 thou shorter than the stock ones)
Chinese cast fiat Tipo 1600 head. (Steve C. has written extensively on the potential of these heads) Here are some pictures:
The head is set for a Tipo thermostat housing, and has no heater hose output:
I made an adapter to remedy both issues:
Installed:
79 mm Osvat intake valves and 27.5mm Manley chrome exhaust valves (Toyota 4AG) were used. The exhaust valves were fit with older Volkswagen valve spring retainers.
Valve springs are Eidelbrock racing.
I did this before rjplenter's year of remarkable research into light weight valve trains. I would go that route were I to do it now.
A Schneider cam: 284-F (34-30, 70-74 .395 lift) was used
The head was ported with a straight cut and blended at the valve side.
ARP hardware was used throughout.
I used Honda CRB 600 fi 36mm throttle bodies that I extended to fit the Fiat:
The intake was made from 35mm ID aluminum tube, and was long, for torque.
In the above picture you can also see the ceramic coated heat shield between the intake and exhaust.
The throttle bodies are fed through an air box with custom velocity stacks. The full radius on them is for better flow.
The air box is huge with a large filter. It is fed by two NACA ducts in the rear fenders.
Oops, I am at my maximum number of downloads, I will start a part 2
Paul Davock
The intent for this engine was to take advantage of the increased stroke and aim for maximum torque across a broad RPM range. I will use as many pictures as possible.
Block: 14 bolt, drilled for 12mm head studs, allign bored, bored for 87mm pistons, decked to provide 10.3 to 1 compression ratio (94 octane gas)
Crank 64.7 mm Tipo 1600.
87mm Wiseco custom forged pistons, with a dished top (for better squish and flame propagation)
Crowder rods (these rods are 60 thou shorter than the stock ones)
Chinese cast fiat Tipo 1600 head. (Steve C. has written extensively on the potential of these heads) Here are some pictures:
The head is set for a Tipo thermostat housing, and has no heater hose output:
I made an adapter to remedy both issues:
Installed:
79 mm Osvat intake valves and 27.5mm Manley chrome exhaust valves (Toyota 4AG) were used. The exhaust valves were fit with older Volkswagen valve spring retainers.
Valve springs are Eidelbrock racing.
I did this before rjplenter's year of remarkable research into light weight valve trains. I would go that route were I to do it now.
A Schneider cam: 284-F (34-30, 70-74 .395 lift) was used
The head was ported with a straight cut and blended at the valve side.
ARP hardware was used throughout.
I used Honda CRB 600 fi 36mm throttle bodies that I extended to fit the Fiat:
The intake was made from 35mm ID aluminum tube, and was long, for torque.
In the above picture you can also see the ceramic coated heat shield between the intake and exhaust.
The throttle bodies are fed through an air box with custom velocity stacks. The full radius on them is for better flow.
The air box is huge with a large filter. It is fed by two NACA ducts in the rear fenders.
Oops, I am at my maximum number of downloads, I will start a part 2
Paul Davock