Power ignition timing distoried a good 455.

[Bob Dunahugh]

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

 

[Irish Rogue]

Soo, what did he do that was so damaging - you have us in suspense?
Mike/The Corvair a holic

Sent from my iPhone

>
> 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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[johnny]

Sound like too much timing advance. Breaks things.

--johnny
--
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" - ol Andy, paraphrased

 

[john r. lebetski]

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

 

[robert mueller]

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] On Behalf Of John R. Lebetski
Sent: Sunday, September 10, 2017 3:30 PM
To: gmclist
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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