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Home » Public Forums » GMCnet » [GMCnet] Power ignition timing distoried a good 455.
[GMCnet] Power ignition timing distoried a good 455. [message #323681] Sat, 09 September 2017 23:40 Go to next message
BobDunahugh is currently offline  BobDunahugh   United States
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Registered: October 2010
Location: Cedar Rapids, IA
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We talked about this here a few weeks ago. A friend told me that he was going to do it to his GMC. I told him don't. He called me Wed. And said he should have listened to me. As I told him that I'd never do it to my GMC. Track car . yes. Well, he now has 7 pistons damaged. And one right rear piston with the top blown out. His 455 had just over 36,000 miles on a rebuild. Just something to think about. Bob Dunahugh
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Re: [GMCnet] Power ignition timing distoried a good 455. [message #323692 is a reply to message #323681] Sun, 10 September 2017 10:35 Go to previous messageGo to next message
Mike Kelley is currently offline  Mike Kelley   United States
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Registered: February 2017
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Soo, what did he do that was so damaging - you have us in suspense?
Mike/The Corvair a holic

Sent from my iPhone

> On Sep 9, 2017, at 11:40 PM, Bob Dunahugh wrote:
>
> We talked about this here a few weeks ago. A friend told me that he was going to do it to his GMC. I told him don't. He called me Wed. And said he should have listened to me. As I told him that I'd never do it to my GMC. Track car . yes. Well, he now has 7 pistons damaged. And one right rear piston with the top blown out. His 455 had just over 36,000 miles on a rebuild. Just something to think about. Bob Dunahugh
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Re: [GMCnet] Power ignition timing distoried a good 455. [message #323696 is a reply to message #323681] Sun, 10 September 2017 11:22 Go to previous messageGo to next message
jhbridges is currently offline  jhbridges   United States
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Registered: May 2011
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Sound like too much timing advance. Breaks things.

--johnny


Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell
Re: [GMCnet] Power ignition timing distoried a good 455. [message #323710 is a reply to message #323681] Sun, 10 September 2017 15:29 Go to previous messageGo to next message
JohnL455 is currently offline  JohnL455   United States
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There were some cockamamie posts on how to set your timing for "max" a while back. One involved WOT brake torque in drive. I warned about this and how there is much more fine skill and art involved, including a variety of driving and weather conditions to get the thing set right. Probably set for max RPM which would be grossly over advanced.

John Lebetski
Woodstock, IL
77 Eleganza II
Re: [GMCnet] Power ignition timing distoried a good 455. [message #323729 is a reply to message #323710] Sun, 10 September 2017 18:56 Go to previous message
USAussie is currently offline  USAussie   United States
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John,

My sentiments exactly, power timing a 26 ft motorhome? What the "F" for? A few extra HP / a bit more torque? So you can out
accelerate who? Why?

It's as dumb as drag racing them! If you want a hot rod build a hot rod!

As we say Downunder; "bloody stupid, Mate, bloody F'n stupid!"

The Maintenance Manuals provide a procedure that will time the engine so that it performs well and DOESN'T S#!T itself!

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of John R. Lebetski
Sent: Sunday, September 10, 2017 3:30 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Power ignition timing distoried a good 455.

There were some cockamamie posts on how to set your timing for "max" a while back. One involved WOT brake torque in drive. I warned
about this and how there is much more fine skill and art involved, including a variety of driving and weather conditions to get the
thing set right. Probably set for max RPM which would be grossly over advanced.
--
John Lebetski
Woodstock, IL
77 Eleganza II


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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426
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