Dutch ProStock record run 2011 Luc Foekema 6,7sec at SBO Lisse

The Dutch Prostock record run is driven in Lisse on Sept 24, 2011 Time 6.79 sec, 0.148 sec reaction time, distance 150 m
Specification:
- Ftt Kreidler engine 90cc
- 5 speed (special)
- UitraSap Ignition
- 30hp at 14.500 rpm
- 2014 Prostock Record holder 6.62 sec at 150m 128km/h
- Topspeed at 1000m distance 200km/h
Profile:
I started racing in 1964. Computers were still not there. I did hardly no calculation. With the advent of the computer everything has changed and complicated calculations are no problem any more. All old historical notes were struggling. In the past 15 years I got a number of programs. Beside I did developed many programs myself in Excel. It was my profession to do so for my employer for many years.
In 2003 also began making calculations for third parties. Not everything, but a lot can be calculated very accurately for any twostroke engine. For instance the exhaustpipe can be calculated in almost exactly the correct speed for which the setup and cylinder is optimal. Even by a large kart engines manufacturer (TM) was found to be not entirely correct. With a new calculated combustion chamber and exhaustpipe it was far better then before.
This is also partly due to the information I got from Jan Thiel and was freely available after retiring from Aprilia racing end 2007.
Also the UltraSap ignition developed by my son Raimond was a very important part. The combustion and power are strongly influenced. Read about this subject my note on Facebook
/ 4209180766868
Sincerely,
Luc

[@50ccRacing]

Thanks Chris

[@RichardHilverts]

Hij pakt die scooter ook gewoon he. Dat is echt geweldig!

[@50ccRacing]

150m Chris

[@Chr1staras]

Aaah i thought 400m but still this little thing is fast as hell! ;-)

[@TRSF1]

wish my 50cc went like thoose

[@Chr1staras]

6.79 on 400m???!

[@hdehaas78]

Wat kost zo'n. 50cc blokje ongeveer

[@50ccRacing]

Dat kun je niet kopen. Een goed roterend 50cc raceblok komt op ca 4000 euro. Je kan het goedkoper en ook nog duurder maken. Het is maar net van welk niveau je uitgaat. Het sprintblok is omgebouwd naar 90cc door alleen de boring te vergroten. Dat blok komt met special versnellingsbak, roterende inlaat, droge koppeling en speciale zuiger en cilinder en cilinderkop op ca 5000 euro. Voor het vermogen was het ca 10% beter geweest om de slag ook te vergroten en de boring iets minder. Dan had het vermogen ca 10% hoger geweest. Maar ook ca 2000 euro duurder. Verder zit er een speciale ontsteking voor een extreme krachtige vonk en kost ca 1000 euro.

[@hdehaas78]

Mooi man, dit zijn echt kleine race machines. Daar kan een 80cc mhr, derbi niet mee mee denk ik

[@DominikHauserVideo]

thats a 90ccm