Formula Super Vee head work

 

Volkswagen racing goes back a number of years, National level racing seems to have all started with the Super Vee.  First Super vee in 1969 were build on an open wheel chassis with and air cooled 1200 an 1600cc power plant.  Then in the  early 70's  as the Super Vee platform evolved  the water cooled  engine was introduced, at first with the 1.6.  Now called  formula super vee (FSV).  These small displacement engines produced lots of power 30+ years ago even compared to todays standards.  How about 185 horsepower from a 1.6 liter 8v engine in a 850 lbs car.

The Formula Super Vee (FSV) engine was based the the Mk1 1.6 Rabbit/Golf I/Scirocco engine turned into a racing engine.  The small valves where replaced with bigger valves which became standard in the US built 83 -84 GTI and Scirocco platforms. David Vizard also wrote a few articles on porting these 1.6 liter heads.  Starting with the small valves and upgrading to 40mm intake and 34mm exhaust, then porting and polishing to get air flow numers in the mid 170's CFM.  If you know more technical details of the race engine contact me, also looking for head flow numbers for these FSV heads.

Very Good article on the Super Vee history:

http://www.grmotorsports.com/backissues/vintage-super-vee.php  

Site dedicated to the active history of the super vee

http://supervee.formulavee.org

 

Super Vee 1.6 head

These vintage FVS cars are still raced today.  FSV, F2, and Formula Atlantic cars from the same period all run together.  Racing rules are outlined in http://www.monosport.com .  

Visual Comparisons of the Formula Super Vee 1.6 head and a 1984 Rabbit GTI ITB solid lifter head.

 ITB Solid Lifter head top, FSV Bottom

 

super vee vs stock head.

 

Front View of the SuperVee 1.6 head.  Appears to be a VW core, from an early non- FI setup(note no injector holes).

Super Vee head front view

 

Air Flow Tests using a manometer - compares air flow between the Stock GTI big Valve head found in 1983 -1984 Rabbit GTi, Sciroccos and 85 -87 Cabrolets, and used in SCCA ITB racing classes.  VS. The early 1.6 small valve head converted to big valves.

Lower values indicate less of a restriction and higher volume if air flow. 

 

 GTI 8v head August 10,2007 74 deg. Low Humid

 

 

 

 

 

 

 

 

 

 

Lift in Inches

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

Flow Inches of H2O

 

26

 

19

 

15

 

13

 

13

 

 Formula Super vee air flow tests

Super Vee Big Valve Head August 11, 2007 74 Deg High Humid

 

 

 

 

 

 

 

 

 

 

 

Lift in Inches

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.55

 

 

 

 

 

 

 

 

 

 

 

 

Flow Inches of H2O

 

28

24

19.5

16.5

14

13.32

12.5

12.5

12

12

 

Here are a few pictures of another FVS legal 1600cc engine with Lucas mechanical fuel injection and a Lucas alternator used to help power the high pressure electric fuel pump. Equiped with the 32 mm air inlets required when using fuel injection.

 

An Interview with the owner:

Sceintific Rabbit - That looks like a sweet engine tell us a little bit about the specs.

FVS Owner -

The engine is 1598 cc. The spec on the cam is .510 lift and I think 283 deg
duration. We have to use bigger 37mm buckets.

We are running flat top pistons at 14:1 compression ratio (23.4 cc
chambers). I don't remember the exact valve sizes but they are about a big
as you can go in a 1600 cc engine.

We set the valve timing at .015 advanced on the intake valve at overlap.
This represents 2 deg advance on the veneer cam pulley.

The ignition timing is set at 40 deg! This seemed way to high to me. Most
other FSV motors are set at about 35 deg but he said that is what the engine
wanted!

The mechanical fuel injection system uses a 6mm Lucas timed metering unit.
We use a single electric high pressure pump set at 80 psi to supply fuel.
The intake has 40mm butterflies but goes down to 32 mm at the velocity stack
inlet.

Scientific Rabbit - That must have been fun to tune, how did the dyno tuning session go?

FVS Owner -

  Dyno operator spent alot of time dialing in the injection. He looked for
lambda.(sp?) numbers between .89 and .92 from the oxygen sensor. Numbers at
about 1.00 represent melt down!

It is amazing to watch as they slowly leaned out the mixture settings, the
Hp and torque reading just come up across the rev range.

Formula Super vee dyno graph: (simply amazing 191HP)

Scientific Rabbit - Simply amazing, very nice race car, have fun racing it.  Thanks for spending the time and providing us a glimps into the great FSV engine.

This and other Vintage Formula Super vees can be seen racing at

www.monoposto.com/