Typical vacuum for 308

50C8DAN50C8DAN Senior Contributor
in HUDSON Posts: 1,406
Anyone know the typical vacuum at idle for a 308?

Comments

  • dougsondougson Senior Contributor
    Posts: 670
    I am running a PCV valve which makes a bit of difference, but I routinely run at 18-20" at idle (one caveat, not all vac gauges are equal, I try to go with a higher quality).
    Doug Smith - "Toby Knoll Garage"

    1951 Muntz Jet
    1953 Woodill Wildfire/Dodge
    1954 Hudson Hornet coupe/Grand National Tribute car
    1955 Studebaker Speedster/Cadillac - "Studillac"
    1956 Corvette SR Replica


  • 50C8DAN50C8DAN Senior Contributor
    Posts: 1,406
    I am swapping out my tredlevac for a modern vacuum booster that typically needs 18 in min.  So wondering if I need to add an aux. vac. pump.
  • dougsondougson Senior Contributor
    Posts: 670
    I would. I have a treadlevac and it works fine now but I know they can be troublesome.
    Doug Smith - "Toby Knoll Garage"

    1951 Muntz Jet
    1953 Woodill Wildfire/Dodge
    1954 Hudson Hornet coupe/Grand National Tribute car
    1955 Studebaker Speedster/Cadillac - "Studillac"
    1956 Corvette SR Replica


  • RichardDRichardD Member
    edited April 13 Posts: 384
    Dan, just installed a PBR VH40 booster on my '53 {1450 psi @ 20"hg}. You will not believe how good the brakes are. EXTREMELY strong--in a heartbeat !! Check your messages.

    1953 Hornet 4Dr 

    A/C-PB-PS-Rearcam-12v-alumrad/elecfan-WWW-visor-etc

    https://goo.gl/photos/a2dCQaWVmu1KT1QFA


  • RichardDRichardD Member
    Posts: 384
    attached VH40 & 44 data

    PRB data_20170411_153256.jpg
    5052 x 6552 - 4M

    1953 Hornet 4Dr 

    A/C-PB-PS-Rearcam-12v-alumrad/elecfan-WWW-visor-etc

    https://goo.gl/photos/a2dCQaWVmu1KT1QFA


  • KdancyKdancy Senior Contributor
    Posts: 2,074
    Richard, just wondering, have you checked your vacuum with a reliable boost guage?
    I checked a fairly new 308 with only a few miles on it and was getting 17 lbs, but the guage is many years old. I assume that as that 308 breaks in, the vacuum will increase.
    53 Super Wasp Coupe
    53 Studebaker Coupe Custom
    64 Champ pickup
    53 Super Wasp Coupe no drivetrain  very good parameter frame and body.
    53 Hornet Coupe od no drivetrain,  haven't decided what to do with this one


    Kerry Wellborn, Florida http://s294.beta.photobucket.com/user/studebaker2/library/
  • RichardDRichardD Member
    edited April 14 Posts: 384
    No, Kerry, just stating what the attachment has on it at max. Think 16" would be good.  Thanks, now I am curious.
    Would need to be the vacuum when the brakes are applied. But I am glad stopping is not better than it is now. Not sure that the 18" above is a minimum; would be an unworkable system. That is why I attached the graph for 'typical' hydrovacs.

    1953 Hornet 4Dr 

    A/C-PB-PS-Rearcam-12v-alumrad/elecfan-WWW-visor-etc

    https://goo.gl/photos/a2dCQaWVmu1KT1QFA


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