RPM @ Idle? - Team Camaro Tech
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post #1 of 9 (permalink) Old Mar 23rd, 08, 05:53 AM Thread Starter
 
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RPM @ Idle?

I have a 396 / Mildly modified /1407 Eddlebrock carb / Torrker 11-20 Intake / Hooker headers....

What RPM should this be idling at?


Paul
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post #2 of 9 (permalink) Old Mar 23rd, 08, 07:05 AM
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Re: RPM @ Idle?

Tough question with the (lack of) info given...

With a stick, or an auto in neutral, the cam duration and overlap will determine your idle speed...
With an auto, the torque converter plays a big part too.

Got some more info?





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post #3 of 9 (permalink) Old Mar 23rd, 08, 11:45 AM
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Mark
 
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Re: RPM @ Idle?

Quote:
Originally Posted by 68CamaroBLKSS View Post
I have a 396 / Mildly modified /1407 Eddlebrock carb / Torrker 11-20 Intake / Hooker headers....

What RPM should this be idling at?


Paul
I just finished putting an EB 7401 intake manifold and the 1407 carb on my 69 with a 350. According to the 1969 Chevrolet chasis service manual tune up chart the idles for a 396 should be set as shown below. I think your going to find that the mods will change the RPM settings. I think your going to have to set the idle to whatever RPM the engine will idle smoothly at.

396 265 HP with syncro 700 RPM
396 265 HP with auto 600 RPM
396 325 HP with syncro 800 RPM
396 325 HP with auto 600 RPM
396 350 HP with syncro 800 RPM
396 350 HP with auto 600 RPM
396 375 HP with syncro 750 RPM
396 375 HP with auto 750 RPM

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post #4 of 9 (permalink) Old Mar 23rd, 08, 12:49 PM Thread Starter
 
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Re: RPM @ Idle?

well... It is a 4 speed / 396 325HP car... With the mild mods listed in my
first message. I'm idling now at 1000 RPMS, but seems high. I dont really
want to mess with the idle screw until i check the timming or carb adjustment screws. I just wanted to get an idea of what i should be.
thanks
paul
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post #5 of 9 (permalink) Old Mar 24th, 08, 03:49 PM
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Mark
 
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Re: RPM @ Idle?

Quote:
Originally Posted by 68CamaroBLKSS View Post
well... It is a 4 speed / 396 325HP car... With the mild mods listed in my
first message. I'm idling now at 1000 RPMS, but seems high. I dont really
want to mess with the idle screw until i check the timming or carb adjustment screws. I just wanted to get an idea of what i should be.
thanks
paul
I think 1000RPM idle for an aftermarket cam is alright, how's the performance? Should be pretty good.

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post #6 of 9 (permalink) Old Mar 24th, 08, 04:12 PM
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Greg
 
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Re: RPM @ Idle?

800

1969 RS/SS Vert

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post #7 of 9 (permalink) Old Mar 24th, 08, 05:44 PM
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Jim
 
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Re: RPM @ Idle?

Still hard to say without more cam info... But I'd think it should idle considerably lower than 1000.

My 383 will idle @ 650 rpm without much tuning on the new EFI, I"m hoping to get her below 600 rpm hot idle.
Cam is a 282 / 290 (232/238) Hydraulic roller.





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post #8 of 9 (permalink) Old Mar 24th, 08, 06:03 PM
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Ron
 
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Re: RPM @ Idle?

My 460 BBC with Edelbrock RPM Air Gap, 830 Dp Holley with Annular boosters and 4 corner idle will idle ridiculessly low running a CB288R-10 Mechanical Roller; but I like it at 800 rpm.

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post #9 of 9 (permalink) Old Mar 24th, 08, 08:57 PM
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Re: RPM @ Idle?

My ballpark would have been 600 to 800 RPM. Looks like the chart above pretty much agrees.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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