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05-20-2010, 09:41 AM
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#1 |
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Registered User
Join Date: Sep 2008
Location: Middleton, Idaho
Posts: 352
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6.2 deisel flatspot...rpm limiter?
At higher RPM, my '85 6.2 deisel hits a flatspot. I don't know what RPM it is, but when I wind it up in 2nd or 3rd gear it falls on it's face. Is there a built in rpm limiter to protect the engine?
__________________
"Built- not bought" 1958 GMC 150 4x4 in progress 1980 K20- Restored 1985 K3500 Flatbed 58 GMC 4x4 build thread: http://http://67-72chevytrucks.com/vboard/showthread.php?t=557675 |
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05-20-2010, 11:05 AM
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#2 |
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Account Suspended
Join Date: Dec 2007
Location: Unnapreciative, Trollville
Posts: 2,079
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Re: 6.2 deisel flatspot...rpm limiter?
There's usually a governor in the Injector Pump. We need to know what RPM it quits at to find out if its quitting at the correct time. Diesels don't turn nearly as high as gas engines.
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05-20-2010, 11:35 AM
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#3 |
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Registered User
Join Date: Sep 2008
Location: Middleton, Idaho
Posts: 352
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Re: 6.2 deisel flatspot...rpm limiter?
It feels like a governor is on there...don't know the RPM, but seems like around 3K.
__________________
"Built- not bought" 1958 GMC 150 4x4 in progress 1980 K20- Restored 1985 K3500 Flatbed 58 GMC 4x4 build thread: http://http://67-72chevytrucks.com/vboard/showthread.php?t=557675 |
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05-21-2010, 08:59 AM
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#4 |
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One shot, one kill.
Join Date: Dec 2007
Location: Saratoga Springs NY
Posts: 859
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Re: 6.2 deisel flatspot...rpm limiter?
Dyno, it's 3K RPM. All diesels, even trailer trucks are limited to 3,000 rpm. I don't know about the really big diesels like RR trains ect, but I have heard ships will only turn 150-200 RPM.
__________________
1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shot  Jim or Paladin whichever you choose.
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05-21-2010, 09:59 AM
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#5 |
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Registered User
Join Date: Jan 2010
Location: Oran, IA
Posts: 78
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Re: 6.2 deisel flatspot...rpm limiter?
I think 6.2s are usually governed at 3800-4K. Assuming you have loud exhaust (mine had dual straight pipes) the exhaust goes quiet when you hit that brick wall.
I'm converting my '87 to a gasser... for now at least. 6.2s dont like having 4.10s and no overdrive
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'87 GMC K2500 Factory 6.2 Diesel, 4 speed. Converted to 350 (has cracked block) converting back to 6.2  '82 [COLOR="Sienna"]Cadillac Coupe Deville 350 DIESEL '93 Chev S10 2.8L 5 speed '98 GMC K1500 Z71 ext cab shortbox 6.5 DIESEL '96 Ford F250 7.3 Powerstroke |
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