vac question

[pwhite]

What is a normal amount of vac at idle Mine pulls about 13 to 14 at idle. I have a 206-206 from precision. is this a problem if so what could be the cause. my blms are good so I quess no vac leak. i dont think the 206 is enough cam to effect vac or is it?


thanks

 

[87gninpa]

With that cam should be about 15-16, so your not that far off. Id check all you vac lines again to be sure.

 

[pwhite]

just swaped to vac brakes and my peddle is rock hard does any body know how much vac it takes to get proper assistance.


thanks

 

[T-top87GN]

There's a possibility that: a) The check valve isn't working, or b) the diaphragm in the booster is shot.

Get a vac gun and check both. When I first put vacs on my old car, the first vac booster I got had a bad diaphragm.

 

[pwhite]

any one know the amount of vac to get vac assist from vac brakes .

 

[pwhite]

ttt

 

[Red Regal T]

Hey Phil, did you try a different check valve?

 

[pwhite]

yes , i replaced the check. and tried getting vac straight from the vac block. with out the master cyclendar bolted up they compress fine but I guess thats to be expected. there getting 14 " of vac @ idle . does any one know of another way to check the booster . is there any thing other than the booster that can cause a rock hard peddle. sorry posted in the wrong spot but it started out as a motor Question

thanks

 

[blackbird]

Vac can

I know this wont help you with your problem but i just changed to a more radical cam and also have vacuum brakes. When i switched to the vac system, i used Red Regal T's, and the brakes worked fine, when i switched to the bigger cam, I had NO brakes!! I hooked up a Vacuum Canister from summit to help with the brakes. iI got the black steel can for around 40 bucks and it was very easy to install.