knock sensors

[Larry Weidner]

What knock sensors are you all using with your 455 & 500's. And does anyone have a P4 455 or 500 bin that I can look at, or a spark table that I could look at to get a ball park feeling of where I should be?

Larry :-)

[George Beckman]

We just got back from a jaunt to the coast, in California. The coast range is not real exciting climb wise and we only cleared 1900 feet. However, being good to my transmission I shifted down and let her climb easy. Too easy, apparently. I was puttering along about 2800 in Second on a ho-hum hill and glanced at my exhaust temp. I almost jumped out of my seat as it was bumping 1400. I have never seen anything like that. Another glance showed me that I was not in PE as I was running at probably 1/3 throttle and MAP of maybe 65. (I was not in Lean Cruise, either)

I punched it to get PE and it cooled down instantly, but it taught me a lesson. Being a good guy and shifting early can make the hill so easy PE never engages. And regular 14.7:1 A/F (normal, not lean) can really build the heat.

I am going to recheck my PE table to make sure it is to GM specs.

Best Wishes,

George
Sent from my iPad

[Gordon]

George,
When I started wrenching snowmobiles in the '70's I had never been on
one so they gave me some pathetic little 250 which I ran full throttle
until it burned up in about 20 minutes . Then they gave me a 440 race
machine, which I ran carefully at 1/2 throttle and seized it up in 10
minutes. Then they explained the race machine had to be run full
throttle or no throttle or it would melt a piston. A year later we
bought two new 670cc machines and melted a piston in each of them. At
this point I had had enough of my own stupidity and began putting
Westach EGT's on everything.
http://www.aircraftspruce.ca/search/search.php?s=WESTACH+EGT+KITS&x=26&y=13
Non-certified parts are cheap. I love them.

[George Beckman]

And that is the one I have. I also remember you burning engines at temps near what I saw. 200 miles later all sounds fine but it sure got my attention.

Although, one side of the dual needle Westach has stopped working and the other requires tapping on it… and for the price I am al little disappointed in that.

On Mar 9, 2014, at 3:57 PM, Gordon <wiz...@telus.net> wrote:

 At this point I had had enough of my own stupidity and began putting Westach EGT's on everything. http://www.aircraftspruce.ca/search/search.php?s=WESTACH+EGT+KITS&x=26&y=13 Non-certified parts are cheap.  I love them.

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Best Wishes,

George

http://www.pggp.com

[nor...@yahoo.com]

I put a skidoo rotax in my polaris snow machine and some after market flat slide carbs 25 years ago. Knowing fukel ratio was unknown I added a pair of Westech probes and the meter you found. It shot to 1400 degrees fast unless at idle or full wot. Drove a lot at WOT that day then changed jetting and had a lot of spare parts and got it good on the next ride. Never realy needed a pyrometer again. Today I used my pyrometer and had a similar experience to George. My digital pyro wont read above 758 deg. BUT at WOT I heard a lot of loud rattling - perhaps spark knock, with a rich af reading. No WUD to help and no record to help. Cfo said George and his cfo should have joined us at Hearst castle. I still have no DFCO. Is a loud rattle ever OK? Sent from Yahoo Mail on Android

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From: George Beckman <gbec...@pggp.com>;
To: EFI GoogleList <gmcm...@googlegroups.com>;
Subject: Re: [GMCMH-EFI] Power Enrichment
Sent: Sun, Mar 9, 2014 11:57:55 PM

[Gordon]

George,
I have beat those gauges to death in snowmachines and boats. Never had a failure .  They also take a severe shaking in most aircraft.   Have you contacted Westach?  The gauge is available separately from the kit.  The temperature is very dependent on the distance the probe is from the head.  Dick Paterson uses 1".  I have always been using 8" as recommend with the early gauges I purchased 30+ years ago.

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[Gordon]

Loud rattle is never good.  Find it now before it gets VERY EASY TO FIND.

[nor...@yahoo.com]

My rattle went away and did not return except briefly early this morning. I strongly suspect there may be a fuel mixture issue due to the ECM or a sick sensor. It may have been a real bad spark knock. My older O2 sensor has failed; it is not used by the ECM. The replacement 02 sensor has a single wire, could I use that in my Howel system in case my newer 02 sensor is failing??

Sent from Yahoo Mail on Android

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From: Gordon <wiz...@telus.net>;
To: <gmcm...@googlegroups.com>;

Subject: Re: [GMCMH-EFI] Power Enrichment

Sent: Mon, Mar 10, 2014 5:48:56 PM