|
|
For the Hoppe's question, look on the gun sites. Cleaning copper fouling is a big deal for them. Ammonia is the key chemical in the process, and Hoppe's #9 has about 10% ammonia. If you read down the discussions, you'll find that brass items that are highly stressed (cartridge cases, clock springs, etc.) should not be cleaned in anything with ammonia, since it starts corrosion cracks that will cause them to fail. But here I have to add a caveat. All of the damage stories include days of soaking, and the method described on the mail list was minutes.
I have a friend who owns the largest Bernina sewing machine dealership in North America. He fixes the machines, and they get gummy. All parts that require cleaning get dunked in a jar of De-Solv-It. After about five minutes, he pulls them out, hits them with a tooth brush, and blows them dry with compressed air. No part of any metal (including brass) has ever shown any evidence of corrosion or other chemical damage.
Given that injectors are solid chunks of metal with a specially shaped and calibrated hole in them, and that the immersion period is very short, Hoppe's #9 is probably safe. But De-Solv-It lacks any apparent corrosives, so it may be the better agent for cleaning.
Ted Noel
N540TF
On 11/9/2013 1:05 PM, Kevin Stallard wrote:
Hmmm,
So much for mechanics recommendation. I'll check it out, thanks for the heads up Mark.
Kevin
________________________________________
From: Lancair Mailing List [lml@lancaironline.net] On Behalf Of Mark Sletten [mwsletten@gmail.com]
Sent: Friday, November 08, 2013 1:23 PM
To: lml@lancaironline.net
Subject: [LML] Re: Injector cleaning
Kevin,
I may be wrong (someone will correct me if I am), but I seem to remember the Continental rep suggesting Hoppes #9 is a not a good idea for use on the injectors. Hoppes #9 is a copper solvent, and IIRC the Continental rep said the injectors are made partially from brass, which is a copper-zinc alloy.
--Mark
|
|