ESE's works engine tuner

[Flettner]

My pipes are a compromise, one I like at the moment for the mid and low range power, top end is great but shorter pipes with steeper cones would be better, for top end.

[F5 Dave]

What if it's rainy season? Some sort of creek crossing scoop mechanism?

[katinas]

My pipes are a compromise, one I like at the moment for the mid and low range power, top end is great but shorter pipes with steeper cones would be better, for top end.

One of Honda's solutions, but of course not the same as sliding header.

[Peljhan]

The second reason: sealing. The circumferential gap that has to be sealed, is three times shorter for the trombone system. That means three times less leakage and three times less friction.

Video courtesy of Rimar Motors:
http://www.youtube.com/watch?v=0odVz...ature=youtu.be

Frits, you forgot about downside of sealing on the header compared to sealing on the belly, the temperature! Header heats up three times more than belly.
Do you know how sealing was done on this rimar engine trobone pipe? I am thinking about some kind of piston rings in combination with fiberglass rope?

[wobbly]

I tested the ATAC system on the BSL500. With a volume close to the cylinder displacement ( bigger or smaller wasnt better ) and a very short tube right at the header start with a solenoid operated
butterfly valve in line with the flow, it made 28% more power below the pipe.
It used a solenoid as the valve had to snapped open at a specific rpm, ramping open or closed lost power big time.

The only time it was useful was in testing a Pukekohe, where if the bike was geared to pull over 300Km/H we did not have a low enough 1st gear to get off the hairpin - a scenario not seen at any GP track.

[Flettner]

I tested the ATAC system on the BSL500. With a volume close to the cylinder displacement ( bigger or smaller wasnt better ) and a very short tube right at the header start with a solenoid operated
butterfly valve in line with the flow, it made 28% more power below the pipe.
It used a solenoid as the valve had to snapped open at a specific rpm, ramping open or closed lost power big time.

The only time it was useful was in testing a Pukekohe, where if the bike was geared to pull over 300Km/H we did not have a low enough 1st gear to get off the hairpin - a scenario not seen at any GP track.

In vinduro I have to get out of the 'hairpin' every second corner.

[Flettner]

What's the deal with two angle reverse cones? Why are they used?