Idle? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

VNMOUS · 07-16-2003, 12:14 PM

What is the proper idle RPM?

69sixpackbee · 07-16-2003, 12:25 PM

what engine? Cam?

SuperCheyenne72 · 07-16-2003, 02:36 PM

Mine Idles at around 750 RPM at red lights...

It jumps to around 850 in neutral and park...

It sorta fluctuates depending on the weather and if the ol' boy has been warmed up enough... (which doesn't take long in this Texas heat!)

check sig. below for what I drive...

VNMOUS · 07-16-2003, 02:47 PM

355 V8, CAM-234 DEG, 488 LIFT

SuperCheyenne72 · 07-17-2003, 10:18 AM

By the way,

If my tach is reading 750 RPM, what does that mean? What is spinning at that fast of revolutions? Is the spinning point inside the distributor spinning that fast? Is it the flywheel? I seriously have no clue?

Tx Firefighter · 07-17-2003, 10:21 AM

That's how fast the crankshaft is spinning. As well as flywheel, clutch, harmonic balancer, yada, yada, yada...

FWIW, The cam and distributor spin at half that speed

69sixpackbee · 07-17-2003, 10:54 AM

The cam and the distributor are spinning at 1/2 engine speed FYI. Yes, RPM is the actual revolutions in 360 degree increments per minute of time of the reciprocating assembly. If you could see the front of the cranksshaft spin once completely around in one minute that would be 1 RPM and the camshaft would have gone just half-way around. It is a 2:1 ratio.

07-16-2003, 12:14 PM	#1
VNMOUS Step Side's Rule Join Date: Feb 2002 Location: LEIGHTON,AL USA Posts: 227	Idle? What is the proper idle RPM? __________________ DANO 07 Silverado Classic 67shortstep 76 stingray 95 cobra 66 Mustang Coupe 289

07-16-2003, 02:36 PM	#3
SuperCheyenne72 Registered User Join Date: Dec 2001 Location: Dallas, TX USA Posts: 80	Here's my 2 cents! Mine Idles at around 750 RPM at red lights... It jumps to around 850 in neutral and park... It sorta fluctuates depending on the weather and if the ol' boy has been warmed up enough... (which doesn't take long in this Texas heat!) check sig. below for what I drive... __________________ '72 Super Cheyenne LWB 350 V8 w/ TH400 MSD Pro Billet HEI Dist. w/ Splitfire plugs Edelbrock Performer Intake Manifold and dual exhuast glasspaks Edelbrock Performer 750 cfm

07-16-2003, 02:47 PM	#4
VNMOUS Step Side's Rule Join Date: Feb 2002 Location: LEIGHTON,AL USA Posts: 227	355 V8, CAM-234 DEG, 488 LIFT __________________ DANO 07 Silverado Classic 67shortstep 76 stingray 95 cobra 66 Mustang Coupe 289

07-17-2003, 10:18 AM	#5
SuperCheyenne72 Registered User Join Date: Dec 2001 Location: Dallas, TX USA Posts: 80	It just occurred to me... By the way, If my tach is reading 750 RPM, what does that mean? What is spinning at that fast of revolutions? Is the spinning point inside the distributor spinning that fast? Is it the flywheel? I seriously have no clue? __________________ '72 Super Cheyenne LWB 350 V8 w/ TH400 MSD Pro Billet HEI Dist. w/ Splitfire plugs Edelbrock Performer Intake Manifold and dual exhuast glasspaks Edelbrock Performer 750 cfm

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07-16-2003, 12:25 PM	#2
69sixpackbee Registered User Join Date: Jan 2001 Location: Sabinal, Texas Posts: 1,706	what engine? Cam?

07-17-2003, 10:21 AM	#6
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	That's how fast the crankshaft is spinning. As well as flywheel, clutch, harmonic balancer, yada, yada, yada... FWIW, The cam and distributor spin at half that speed

07-17-2003, 10:54 AM	#7
69sixpackbee Registered User Join Date: Jan 2001 Location: Sabinal, Texas Posts: 1,706	The cam and the distributor are spinning at 1/2 engine speed FYI. Yes, RPM is the actual revolutions in 360 degree increments per minute of time of the reciprocating assembly. If you could see the front of the cranksshaft spin once completely around in one minute that would be 1 RPM and the camshaft would have gone just half-way around. It is a 2:1 ratio.



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