maineolds

Anyone know the stock spec for engine RPM at idle? I don't have a listing in my manual. I'm also having a hard time finding an open vacuum port on the intake manifold or carb. I need this to set the air/idle screws. I think I'll tap off the vacuum for the wipers. thoughts? Thanks

Vintage Chief

The Magic 8 Ball is currently inoperative. Therefore, unable to assist w/o Model, Year, Engine size & Model/Manufacturer of carburetor.

Vintage Chief

Unless it's been removed, look for the engine tune-up specifications label on the fan shroud. This car have AC?

maineolds

Thanks for the correction on missing info. I’ve made so many post on this car over the past couple weeks I thought I’d stated those details in this post but didn’t.
1949 Oldsmobile 88, Rochester carb. 6 volt. Other than the recent Petronix ignition, its stock. 29,000 original miles.
no data on any under hood tags

Vintage Chief

I looked at your recent posts - you're the chap w/ the '49 88. Well, that one is going to be out of my league on idle specifications. Generally, that type information is contained in the tune-up section of the manuals, or directly in the front under the maintenance sections. Any vacuum should work fine for making the A/F mixture screws adjustment. Find a currently used vacuum line, and use a "T" fitting to tap into the vacuum line. I would think a rough estimate for idle would be somewhere in the ballpark of 850 rpm?

rocketraider

Back then very low idle speeds were seen as desirable. Like 400-450 rpm low. I'd start at 500-550 meself. See if you can find an old Motor's, Glenn's or Chilton's manual covering the 49.

VC455

400 to 425 rpm per http://rocket100.com/olds-engine-spe...ocket-v8-spec/

oldcutlass

If you have a vacuum pump still disconnect and cap it while adjusting the carb.

maineolds

Great info. Thanks everyone

maineolds

Oldcutlass, should I also disconnect the vacuum line that goes to the choke and the vacuum line that goes to the distributor advance before setting the carb?