Harness With/Without Elbows?

How to keep the Cessna 170 flying and airworthy.

Moderators: GAHorn, Karl Towle, Bruce Fenstermacher

Post Reply
User avatar
N1478D
Posts: 1045
Joined: Mon Apr 22, 2002 5:32 pm

Harness With/Without Elbows?

Post by N1478D »

Planning on replacing the harnesses during the annual coming up. The IPC shows elbows, the current harnesses don't have elbows. What are your thoughts? Are the elbows worth having? And, the angle looks greater than 90 degrees in the IPC. The shopping so far only shows eblow angles of 90 degrees. Wondering if there have been any unhappiness with a certain brand, or, if a brand has stood out from the others.

THANKS In Advance!
Joe
51 C170A
Grand Prairie, TX
mrpibb
Posts: 395
Joined: Wed Apr 23, 2003 10:48 pm

Post by mrpibb »

Being that on my ragwing's pressure cowl the front two cyclinders leads chafe on the upper pressure cowl, it was like that when I bought it this summer. So I have two options, make two eyebrows in the pressure cowl to acomdate the straight leads or buy two leads with the elbows on them. Even with the elbows I may have to make a relief area on the pressure cowl as the current day spark plugs are a little longer than the ones in 1948.
If you dont have the pressure cowl your golden, but I think straight leads are a little cheaper, what I am going to use are straight ends on the lower plugs and straight leads on cyl 1 and 2 and 90 deg leads on cyl 3 4 5 and 6 for the upper. but it will probably come down to what we have in stock in our shop.
Happy Holidays
Vic
Vic
N2609V
48 Ragwing
A Lanber 2097 12 gauge O/U Sporting
A happy go lucky Ruger Red label 20 ga
12N Aeroflex
Andover NJ
http://www.sandhillaviation.com
Image

" Air is free untill you have to move it" BB.
User avatar
N1478D
Posts: 1045
Joined: Mon Apr 22, 2002 5:32 pm

Post by N1478D »

At Select, a shop at LNC, the elbows added $30 for the pair of harnesses. It was a verbal quote.
Joe
51 C170A
Grand Prairie, TX
User avatar
GAHorn
Posts: 21290
Joined: Fri Apr 12, 2002 8:45 pm

Post by GAHorn »

Elbows were originally designed to accomodate early insulation materials that would not tolerate sharp bends and vibration without cracking.
Elbows are an unnecessary expense if you don't have an interefence-fit problem. Modern ignition harnesses are very flexible and can be routed, clamped with Adel clamps, even ty-wrapped back down to the plug, to prevent chafing.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons. ;)
zero.one.victor
Posts: 2271
Joined: Tue Apr 23, 2002 12:11 am

Post by zero.one.victor »

I put on new Slick mags & harnesses about 3 years ago. They came with straight leads. I haven't ever noticed a problem with them. I have the airbox baffling on my ragwing also.
I do have the leads tie-wrapped in place inside the airbox--on the RH side to the breather tube & on the LH side to I can't remember what :oops: Maybe just each other.

Eric
Post Reply
Cessna® is a registered trademark of Textron Aviation, Inc. The International Cessna® 170 Association is an independent owners/operators association dedicated to C170 aircraft and early O-300-powered C172s. We are not affiliated with Cessna® or Textron Aviation, Inc. in any way.