| [GMCnet] Good engine destroyed. Yours could be next. [message #363871] |
Sat, 08 May 2021 09:44  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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I got a call from someone today. That severally damaged a real good running 455. That I built for him 2 years ago. That engine is now trash. When the engine was going in. I pleaded with him to put a GM/Howel EFI system in. His response was. " My carb works great. It's been working to perfection. The carb was rebuilt last year. By someone that knows them well." I should keep my mouth shut on this. As I could go on for days. Over engines. On ways to extend your engines service life. But I'm just sick of this happening. I now know of 4 good engines destroyed in this manner. In the last few years. Engines are my thing. I could post a lot on engines. But it's best that I not. I push GM engines way past their design paramotors. And don't destroy them.
Sorry. I digress. That stock Q jet has always been considered to be one of the finest carbs ever built. As to controlling the air/fuel ratios. Over its entire operating range.
The general though. Is that the carb dumps an air/fuel mixture into an open chamber. That's in the intake manifold. Well. Not really. The Q jet that came on the GMC. Are really two carbs in one aluminum casting. Thus. The left carb feeds 2 cylinders on each side of the engine. The right side feeds the other remaining 4 cylinders.
The problem is that if one side of the carb goes lean. And starts burning up its 4 cylinders. You'll have absolutely no idea of the in pending destruction. Till it's just too late. With the GM/Howell system. The engine check light will come on. To let you know of any issues. Then tell you what's wrong.
Engine service life before the mid 80's was under 100,000 miles. Then in the late 80's. EFI came along. Then service life more than doubled. Yes. Other things that helped. But EFI was the BIGGY. If you wish to talk on this issue. Contact me direct. Not on the net. Or 319-521=4891 Cell.
Bob Dunahugh
78 Royale since 2003
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