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Below you mention using “small Earl's in-line filters with the conical (brass?) filter blocks.” These sound like the sintered bronze filters that Tracy recommends not using as they become blocked more easily than mesh screens

Unfortunately I never heard (or read) that recommendation. :(

However, I can tell you that they block easily, and the blockage is hard to see. :)

Another point against them is that there's no nut on the center section, so if one end's tight you cant get the other end off without using a pipe wrench on the pretty blue aluminum.

Thanks for the suggestion of stainless mesh version, but I think I'll get those big things that Buly has. All I have to do now is find somewhere to put them.

It seems that these filters have been restricting fuel flow at higher rpm. I flew today today after giving the filters a really good cleaning. It was as though I found fifth gear after driving for two years in forth. I'm using MUCH less boost and getting MUCH more power. Static went up from 4600 to 4950. Wahoo!

Regards,

John

(48.3 and free to roam)

John,

Below you mention using “small Earl's in-line filters with the conical (brass?) filter blocks.” These sound like the sintered bronze filters that Tracy recommends not using as they become blocked more easily than mesh screens. The sintered bronze is also hard to see if blocked, which it sounds like you experienced.

Earl’s has one type of filter that comes in either sintered bronze or stainless steel mesh (field cleanable). Here’s a link that describes the stainless steel mesh version:

http://www.importevolution.com/product_info.php?products_id=3465

Chris

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of John Slade
Sent: Monday, January 09, 2006 9:34 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Earls in-line fuel filters

I've been having fuel flow problems on one side for a while.

Runup would give me full static on either pump. I take off on both.

Some time later in the flight here's what happens:

    I'm be running on left pump only

    I increase throttle to climb

    mixture goes off the scale lean

    engine falters

    I switch on the right pump (which feeds from a separate tank), mixture comes back up and engine runs normally.

I have the small Earl's in-line filters with the conical (brass?) filter blocks. They always "look" clean when I take them apart, but yesterday I tried blowing through them. They were very restrictive, especially the left one. After I clean them with high pressure air they flow much better, but I'm beginning to think these filters are not good for our purpose. They're too small and too easily blocked. Additionally there's no nut on the center section so they're hard to get apart at both ends.

I think I'll get larger canister type filters with a drain like Buly's. Buly - where did you get those? Got a part number?

Anyone else have a filter part number they can suggest?

John

Turbo Rotary Cozy IV

47.5 hrs.