daverclasper Posted September 14, 2023 Report Share Posted September 14, 2023 Hi. Thinking of fitting one to Vitesse (I know its probably is an unnecessary "must have"). I only want to do this if it's relatively straightforward and simplistic ?. Car has the standard PCV arrangement and would like to use a period Smiths gauge . Would it be possible and work out, to put a T piece in the middle of the S shape hose that's between the valve and inlet manifold. If so, what other bits would I need, eg, type/size of hose, hose size reducers, etc Ta Link to comment Share on other sites More sharing options...
Iain T Posted September 14, 2023 Report Share Posted September 14, 2023 Honestly fit a Lambda sensor and air/fuel ratio meter before a vacuum gauge. I bought a stand alone vacuum gauge with fittings and plugged it in from the rocker cover to manifold and bypassed the pcv. Used to see what the vacuum was but didn't really aid me to tune the engine anywhere near as much as an afr meter. It aids ignition setting but if you have pancake filters it can muck up the reading. Iain Link to comment Share on other sites More sharing options...
Colin Lindsay Posted September 14, 2023 Report Share Posted September 14, 2023 51 minutes ago, Iain T said: Honestly fit a Lambda sensor and air/fuel ratio meter before a vacuum gauge. I bought a stand alone vacuum gauge with fittings and plugged it in from the rocker cover to manifold and bypassed the pcv. Used to see what the vacuum was but didn't really aid me to tune the engine anywhere near as much as an afr meter. It aids ignition setting but if you have pancake filters it can muck up the reading. Iain I think it's more likely one of the Redex Robot gauges or the small multi-coloured vacuum gauges, the trick is to drive with the needle always in the green. It just needs a manifold takeoff, but I think putting one into the S-hose at the PCV wouldn't give an accurate reading as you're getting the reading from the rocker cap end, not the intake manifold via the carbs. I'm always open to reeducation but I think you'll have to drill and tap the manifold. Link to comment Share on other sites More sharing options...
Iain T Posted September 14, 2023 Report Share Posted September 14, 2023 16 minutes ago, Colin Lindsay said: just needs a manifold takeoff, but I think putting one into the S-hose at the PCV wouldn't give an accurate reading as you're getting the reading from the rocker cap end, not the intake manifold via the carbs. I'm always open to reeducation but I think you'll have to drill and tap the manifold. I might have misremembered and only fitted to the manifold? Anyway drive like you've stolen it, it's more fun! 😁 Link to comment Share on other sites More sharing options...
daverclasper Posted September 14, 2023 Author Report Share Posted September 14, 2023 Thanks Guys. I did wonder about its accuracy, as even though the S hose is downstream from the valve and does go to manifold, will not maybe as accurate as direct from the manifold? Link to comment Share on other sites More sharing options...
dougbgt6 Posted September 14, 2023 Report Share Posted September 14, 2023 I have a vacuum gauge off a "T" piece to my servo. It exactly mirrors the "by ear" method of setting the timing. Turn the dizzy for the highest revs, OR highest vacuum, it's the same thing. Then turn back a gnats OR ! bar, . And you got it. I love the vacuum gauge whizzing about, impresses the ladies. Doug Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 15, 2023 Report Share Posted September 15, 2023 i would drill and tap the manifold (use a well greased drill to collect swarf) you will need a restrictor in the supply pipe many add a short bit of brake pipe and squash it with pliers till you get a steady reading or the needle will flutter a lot then driving with the highest vacuum is no fun at all Pete Link to comment Share on other sites More sharing options...
dougbgt6 Posted September 15, 2023 Report Share Posted September 15, 2023 Dave has a Vitesse, I think, do they not have a tapped hole in the manifold already? Dunno, I only know about very late MK3 GT6s! My vacuum gauge came with a restrictor fitted. Doug Link to comment Share on other sites More sharing options...
Peter Truman Posted September 15, 2023 Report Share Posted September 15, 2023 54 minutes ago, Pete Lewis said: you will need a restrictor in the supply pipe many add a short bit of brake pipe and squash Pete In my youth when writing telex's from the phone from dads UK Co' to his Aus Co. esp on a Sat morning (UK 11hrs behind) they used to be called snubbers, we had a box of them in our home workshop here for process control equipment think they were brass 1/4 in barrell unions with a very small hole/orifice in a disc in them, Also used in PC equipment on my own water supply pressure monitoring equipment. Nothing as crude as a crimped pipe but kiss always works! Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now