 NPC! Engine problem |
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| ripper911 |
  Feb 10 2016, 08:05 PM
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corde pulsum tangite  Group: Members Posts: 2,920 Joined: 25-April 10 From: Powder Springs, GA Member No.: 11,654 Region Association: South East States  |
I am here to draw upon the wealth of mechanical knowledge on this forum to help diagnose my brothers chevelle. I don't know much about that type of engine.
I believe the engine is a 400ci that has been destroked to 377ci. It recently started flattening the spark plug gaps. He doesn't think the rods have stretched because they are supposedly high quality. It doesn't sound like the crankshaft is moving around or anything. He's a mechanic, neither he, his boss, nor anybody else he's asked has been able to figure it out. |
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| jmill |
Feb 11 2016, 07:03 PM
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
QUOTE(Tom_T @ Feb 11 2016, 12:49 AM)  a great powertrain, but for the life of me I can't understand why anyone would want to destroke it down to 377!!?? (IMG:style_emoticons/default/confused24.gif) (IMG:style_emoticons/default/huh.gif) I've stroked a 350 to 383 with a 400 crank. No idea why you would put a 350 crank in a 400 for 377? Only thing I can come up with is the 400 crank was bad and he had a good 350 crank around. It would reduce piston speed but the valve train if usually what limits your RPM. (IMG:style_emoticons/default/confused24.gif) |
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Posts in this topic
ripper911 NPC! Engine problem Feb 10 2016, 08:05 PM
messix carbon on the pistons contacting the plug ? Feb 10 2016, 08:22 PM r_towle He may be using the wrong plug or he may have forg... Feb 10 2016, 08:26 PM walterolin Wrong plug? Feb 10 2016, 08:26 PM ripper911 I'll mention those things. It started doing i... Feb 10 2016, 08:30 PM Bruce Hinds There long and short reach plugs.
Did he change p... Feb 10 2016, 08:32 PM rick 918-S Who built the engine? Are the heads shaved? I agre... Feb 10 2016, 08:41 PM ripper911 He says that he's running the same plugs that ... Feb 10 2016, 08:49 PM zipedadoo Is the transmission an automatic?
On some of the... Feb 10 2016, 09:24 PM ripper911 I believe he changed from a 3 speed to a 4 speed, ... Feb 10 2016, 09:38 PM zipedadoo I don't think any of the 4 speeds used a vacuu... Feb 10 2016, 09:49 PM Steve Pratel Plugs are likely too long.
Even if they are the ... Feb 10 2016, 10:37 PM Tom_T I think the above are all good suggestions to look... Feb 11 2016, 12:49 AM
Bruce Hinds
a great powertrain, but for the life of me I can... Feb 11 2016, 07:31 PM cwpeden Wrist pins? Feb 11 2016, 07:38 PM veekry9 Go ahead,snoop around.
All will be revealed.
http:... Feb 12 2016, 08:32 AM |
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