Vlad's rides thread

[vlad01]

I'm hoping that with some custom made tall rocker covers to suit the YT Platinum adjustable rockers based on the factory covers (to use the OEM o ring seals and captive bolts/rubber grommets) so that the bolts are the originals and down low on the head, I might just be able to squeeze in the covers with the smaller diameter VH512 dual booster that my VP S already has and be able to wiggle them off and out without drastic measures such as dropping the engine and K frame down to get them off in order to adjust the lash.

This pump would give me all the reason to keep the booster and have great brakes, as the cam I have on the shelf would have next to no vacuum, so much so it would be an improvement to delete the booster


Also I realized that one thing no one ever talks about or knows the answer, is with a big cam does any of the vac operated actuators even work on the HVAC?

Well this would 100% negate that issue and they will work before you even start the engine!

[v6bucket Profile]

If the LSA of the cam isn't too low, you will have vacuum for HVAC system, have a look at most cams for LS engines, generally 110° +.

[Charlescrown Profile]

That's a point. I remember the old Falcon GT having a fairly large reservior for vacuum but I'm sure it was only for brakes and all the actuators were cable operated. I'd try it as it is with the cam and it may be enough vacuum to operate them normally. If not maybe make up a vacuum reservior.

[vlad01]

If the LSA of the cam isn't too low, you will have vacuum for HVAC system, have a look at most cams for LS engines, generally 110° +.

Easy enough to T in the HVAC vac line to the pump/boost line. In fact I read it's a good idea to T in the engine vac supply line too with a check valve so that in case of a pump failure or slow recovery the engine can add some vacuum, but outside of those conditions it never will open the check valve, it's just a worst case backup.

My cam is 106 lsa but the overlap is somewhere around 90 deg as the 50 thou duration is 262 deg. Def needs a pump.

[Charlescrown Profile]

How much vacuum do you expect to get with the cam. My guess about 15 inches @ idle which is probably more than enough to work hvac controls.

[vlad01]

Little idea really, but googling similar specs on similar per cylinder displacement, something like 8-10" is what others get but I don't know what that is in kPa. I don't understand yanky units.

[immortality Profile]

What sort of KPa reading do you see at idle? Between 60-70KPa?

https://convertlive.com/u/convert/inche ... opascals#8

Use the converter to work out a KPa value but then subtract that from 100Kpa (atmo pressure).

[vlad01]

I haven't built anything yet. I have the cam and a few bits already but it's a far away project that I am slowly planing and working out the details before I start.