REFLECTOR: New PMag and Matco XLHD Brakes Update

Thu Feb 28 21:55:17 CST 2013

Hi Kevin...

You might ask Jon Bachman about his performance... He has a std. RG with a IO-360 200  HP engine...

Steve 

> Date: Thu, 28 Feb 2013 21:33:51 -0600
> From: flykb at verizon.net
> To: reflector at tvbf.org
> Subject: REFLECTOR: New PMag and Matco XLHD Brakes Update
> 
> Hi All,
> Ok.. so I thought I would post what I've been doing/upgrading for others 
> to learn by and maybe a good story for folks to read thru.
> I know I enjoy reading these from other builders so I thought I'd submit 
> one as well.
> 
> 1st - I had the old electoair system. During run ups, while doing the 
> 'mag' check I found that the elec ignition ran rougher than the mags. mmmmm
> So, I called electroair and they suggested I send the coils (firewall) 
> and mag sensor to them to check out. They found that the mag sensor 
> bearings were too loose/going out and suggested I get a new sensor unit. 
> (that would explain the rough elec ignition). When they told me to take 
> the coil pack off the firewall they told me to just remove the 
> connections and take the vacuum hose off and send it in.
> We'll when I got it back I had removed the vacuum hose from the coil 
> pack (which came off without a problem) - we'll I have the old unit 
> where the coils and vacuum are all on the firewall. When I called 
> Electoair  on how to reinstall the vacuum hose they said that once it 
> comes off the coil pack it's done - no way to fix it and I would have to 
> purchase one of the new coil packs with the coils on the firewall and a 
> connection to an inside the cabin part (2 parts now).
> We'll - I now had a decision to make. I have to give them credit that 
> they would give me a discount since I was an old customer, but I was not 
> fond of drilling more holes thru the firewall and metal shield as my 
> plane is up and flying.
> SO - I looked around and spoke to alot of folks an decided to put on a 
> PMag instead (it's self contained and has a built in alt for generating 
> it's own power) ie battery dies and the pmag will keep on running - no 
> problem.
> I got the PMag and installed it and it's super simple to time, 
> installation was very easy and I can say runs as smooth as silk. (I'm 
> sure the electoair would have run smooth as well with the new mag timing 
> unit) - The other reason I switched was that in 200 hours the mag timing 
> unit had been replaced now 2 times due to bearings. ?)
> Ok.. so know I've done several tests and run ups and am ready to go 
> flying - engine running great - My Biannual is up (actually today) so - 
> I've got to get that taken care of in March.
> I'm thinking I may have (hopefully) more power since before I was only 
> running on mags and off timed electoair - not the most efficient.
> 
> With the old setup I was running at 160kts at 10k at 9gph with a new 
> catto 3 blade prop. (My plane is a Elite 173FG - Long wing (like XL) 
> with std elite fuse)
> 
>   ... Part 2. New Matco Brakes...
> Ok.. I had the old normal Matco Brakes and had ok braking - I wanted to 
> be sure I had plenty of braking. If I landed on short field, full gross 
> and a little fast wanted to make sure my brakes would not fade/fail on 
> me and my old brakes I would have to really push to get the most use out 
> of them.
> So - I did some measurements as to energy and the brakes ability, I 
> spoke to Matco and bought the 600XLHD..xxx brakes (don't remember the 
> exact model but they were the 600XL heavy duty ones).
> They came in and I went to install them on the gear legs. I was a little 
> nervous about the whole brake bleeding thing but after some research 
> found on the RV forum a guy that used a TSC quart metal oil can and a 
> tube. I got the air out of the pump and tube - attached it to the matco 
> caliper and pumped from the bottom until it was close to the brake line. 
> I then connected the brake line (don't for get the brass insert in the 
> brake line so you will not have any leak issues) and pumped from the 
> bottom up to the brake master cyl. Man- what was I worried about .. 
> piece of cake and no air bubbles in the line. I did both sides in about 
> 20 min - by myself. :-) (smiles all around).
> I wanted to double check my toe in and camber while I was there and the 
> camber was perfect - toe in ..mm not so much.
> I called Velocity and they indicated the toe in on a FG should be 
> between 2"-4" total and that they don't have to be exactly even on both 
> side but the important part was to have toe-IN. I actually had a little 
> toe out and it was tracking funny - no kidding.
> 
> Ok.. so I dropped a nose plumb line and found the center between the 
> gear legs to measure my toe in. I then used a little laser level with a 
> flat side to project a line to find my toe in.
> At this point I must say that I had the measurements of toe-in before 
> jacking the plane. I then measured the toe in after the plane was jacked 
> up and thought I could "adjust the axle bolts" until I had the right 
> toe-in. ie- I needed 1" more toe in adjust the axels (tightening and/or 
> washers) until I got 1" inch toe-in.
> The part I found out later is that when you put the weight back on the 
> axle (and yes roll it in and out) the weight will make the wheel to head 
> toward toe OUT the heavier it is.
> I had the toe-in set at 1-1/2" on one side and 2" on the other with 
> (10gal fuel) - I then, filled up (50gal) and had Lt 0" and Rt0.5" mmmm 
> didn't see that coming.
> No wonder it pulled a little to the Left after coming back from filling up.
> 
> So, I decided to go back and set the toe-in to what weight I will 
> normally be flying at to 1 to 1.5 on each side. Then when I'm light I'll 
> have more toe in (eating more tire but tracking ok) and when at full 
> gross will have about 1/2" toe in on each side. (don't usually fly full 
> gross but very rarely).
> 
> Oh.. and the brakes work MUCH better - especially after you do the 
> 'breaking' procedures on the pads.
> 
> So - Very happy with the pmag / Brakes are much better / bleeding was a 
> breeze with the RV/can setup / and I must say I'm getting tired of 
> jacking the plane up and messing with the toe in but now I'm able to do 
> it in about 30-40 min on each side and with 1 more adjustment will be 
> done. :-)
> 
> Now... I just have to get the pesky biannual done so I can fly with the 
> new pmag and see if I have more power at alt. :-)    (fingers crossed - 
> I would love to see 165 or possibly 170)
> 
> Hope this was if not helpful - entertaining for folks....
> Kevin Baker
> N164PS  173FG Elite Catto   IO-360 200HP
> 
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