[RaceProEngineer]

Hi Gang,

Just a quick "heads up" on a POTENTIAL problem using foam blocks in the Fuel Cell, IN CONJUNCTION with pump gas (UNleaded).

Most of us use some sort of foam blocks in our cells to baffle the wave movement of fuel under hard cornering and braking, along with minimizing the attendant weight shifts.

Recently, an unusually high percentage of racers have reported disintegration of these foam blocks, resulting in sludge in the fuel cell and lines, and (far worse) foam particles in the carb or injectors, and the MOTOR! Also, some bladders being rendered unusable.

THIS IS JUST PRELIMINARY STUFF. We can neither confirm nor refute, but there APPEARS to be a connection between this "early" disintegration and the increasingly popular use of pump gas for the track.

THIS IS JUST CONJECTURE, and perhaps someone on the board who works in the fuel cell industry will chime in, but apparently most of the commercially available foam blocks were formulated and designed to live in high octane race gas (like avgas). Likewise, the "rubber" bladders lining those cells. We are not chemists, but perhaps there are elements in unleaded gas which are not very friendly to the makeup of the foam blocks and bladders?

We did not use pump gas in our 911, but nevertheless placed a time-life parameter on those blocks, and replaced them regularly.

We welcome much more input!
Ed LoPresti