Fuel pressure, sensor

[designrs]

Here's the fuel line reroute. Fuel supply line going into the mechanical pump is repositioned high.

[roger lee]

You can also help cut down a lot of heat by wrapping the exhaust pipes. It stops a lot of radiated heat.You can get the 2" header wrap cloth at most auto parts stores. Wrap from the head down and under the exhaust springs and around the knuckle.

[designrs]

You can also help cut down a lot of heat by wrapping the exhaust pipes. It stops a lot of radiated heat.You can get the 2" header wrap cloth at most auto parts stores. Wrap from the head down and under the exhaust springs and around the knuckle.

Interesting suggestion Roger. Would you need a LOA for that? Is there any downside wrapping the exhaust pipes?

[roger lee]

I have been wrapping the stainless steel Rotax exhaust pipes on many aircraft for 10 years and have never seen any issues. I does save the hoses and wire insulation from extra radiated and convective heat. My FD CT has been wrapped for 8 years. You can't put your hand on a bare hot exhaust pipe, but I can on mine. The header wrap MFG claims a 70% heat reduction. I don't know if it really is that much, but it works.

Technically you would need an LOA.

I have seen people do it with and without an LOA so it's your choice.

p.s.
Use 2"wrap and only over wrap the edges by 3/8". The cloth must be moist, but not soaked to apply. Pull it taught as you go. It comes in a 50' roll and cut no more than 60" piece for each pipe.

[designrs]

Thanks much for the info Roger!

[designrs]

So why don't our planes come from the manufacturer with the pipes wrapped like this?

[designrs]

Roger, I believe you once posted guidelines for replacing rubber while reducing the risk of rubber fragment contamination. Can't seem to find the link. Can you please reiterate?
Thanks!

[roger lee]

See if this guy's rendition works

http://www.rotax-owner.com/en/rotax-blo ... iderations

[designrs]

See if this guy's rendition works

http://www.rotax-owner.com/en/rotax-blo ... iderations

Good reading. Thanks!

[drseti]

That blog item came out only after I had done my first 5 year rubber replacement. It taught me everything I had done wrong.

[roger lee]

I would bet you even know who wrote it.

[designrs]

OK. On my 2011 SportCruiser, I had my mechanic reroute the fuel feed line to the mechanical pump, as per photo above (Sat Sep 19, 2015 9:53 am), as per US Sport Aircraft.

Here are some observations:

1) Same hose. Same length. Have new clamps handy.
2) The fuel pump end is a barbed fitting. The other end by the firewall is not... so easier and less chance of rubber debris pulling the firewall side off.
3) Easy reroute. Done in minutes.
4) This positions the hose high, away from the hot engine block, AND puts it in direct line with the air induction on the cowling.

Test flight done. Too soon to determine the benefit immediately, but I'm very optimistic and will post results.

[MrMorden]

I have been too lazy to wrap my exhaust pipes. Does it provide any measurable benefit? My engine runs pretty cool except in long climbs on hot days, where I might see oil temps of 230°F or more. CHTs stay fine.

[roger lee]

Hi Andy,

Wrapping the pipes takes about 45 min.- 1 hr. It won't change your engine temps, but will reduce the radiated and convective heat on all the hoses and wiring insulation and any other parts susceptible to heat under the cowl. It may make some items last a lot longer and degrade much less over time.

[MrMorden]

Cool, thanks Roger! Do you have a preferred brand of wrap?