Fuel tank Foam blocks - Triumph Forum: Triumph Rat Motorcycle Forums

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post #1 of 12 (permalink) Old 06-07-2011, 07:00 AM Thread Starter
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Fuel tank Foam blocks

Does anyone use them? The anti slosh blocks of foam stuffed into your tank.
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post #2 of 12 (permalink) Old 06-07-2011, 08:28 AM
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I was under the impression that fuel usually dissolved foam.

The purpose would be to keep the fuel fuel from shifting in fast left to right transitions ? Or am I not in tune enough with my bike to notice other possible benifits?

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post #3 of 12 (permalink) Old 06-07-2011, 09:44 AM
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There are various fuel resistant foam blocks available for gas, JP fuel, and brake fluid applications.

I've never heard of anyone needing to install them on a street bike. In fact, it might be quite difficult to do after the fact. But, there are vendors selling them for that purpose. The justification for bikes seems to be slosh control.

I'm not certain when they first became available for the auto racing industry, but I do know they have been used in aviation for at least 40 years.

Why did I include brake fluid? Take a look at certain BMWs.

The main purpose of the foam in a car or plane fuel tank is for vapor explosion prevention. A secondary benefit is slosh control by increasing surge boxe effectiveness.

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post #4 of 12 (permalink) Old 06-07-2011, 01:30 PM
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Saw it at my local MC mechanics shop. He swears by it for MX. I found the demo cool. 2 jars one half filled with fuel only and 1 with same amt of fuel but with the block in it expanded to fill the jar. Result was; no slosh. I wondered if this was a hood idea on street bikes and/or whether this added mass in the tank would minimize my fuel capacity. I can't afford that. I want more range as it is!!!!
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post #5 of 12 (permalink) Old 06-07-2011, 07:49 PM
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On aircraft, the reduction in tank capacity was minimal.

On a metal tank bike, corrosion could be a factor.

There are microbes that can live in certain fuels. Their microbial by products (poop) is acidic and can induce corrosion. The foam in the acft wing tanks was found to cause concentrations of microbes so, depending on plane type, there is usually a periodic removal of the foam and an inspection of the tank surfaces. There are also biocide fuel additives/treatments but the periodic inspections are still required.

A metal bike tank has a protective interior finish that ought to address the corrosion concern. Of course, the finish integrity would have to be 100 per cent.

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post #6 of 12 (permalink) Old 06-07-2011, 08:35 PM
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I remember a stand at the NEC Motorcycle Show in Birmingham selling 'Explosafe' metal expanding mesh about 25 years ago. They ran a 'before and after' video of someone shooting a petrol/gasoline filled oil drum without it (big explosion) and with it (hole, gentle trickle, no explosion).

A buddy was going to buy a tank's-worth (fifty quid back then, not a small sum). I pointed out that I didn't know anyone who had died as a result of an exploding tank or fallen off as a result of 'sloshing'. He went and spent the fifty on a back tyre instead. Smart move.
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post #7 of 12 (permalink) Old 06-07-2011, 09:51 PM
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Quote:
Originally Posted by Lord Flashheart View Post
A buddy was going to buy a tank's-worth (fifty quid back then, not a small sum). I pointed out that I didn't know anyone who had died as a result of an exploding tank or fallen off as a result of 'sloshing'. He went and spent the fifty on a back tyre instead. Smart move.
That there is pretty great statement . Spend the $ where it is going to have the most benifit .

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post #8 of 12 (permalink) Old 06-07-2011, 10:41 PM
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We use the foam in our FSAE racecar to keep the fuel from sloshing away from the fuel pump pickup but I don't see a need for it in a street bike.
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post #9 of 12 (permalink) Old 06-07-2011, 11:50 PM Thread Starter
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Guess that's a no then.
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post #10 of 12 (permalink) Old 06-08-2011, 07:35 AM
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Many fuel cell foam blocks tend to fill the fuel filter with little plastic bits.

Plus, fuel slosh helps to cool the pump. If the pump gets hot, it tends to cause erratic performance as the light end hydrocarbons evaporate.
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