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brake servo vacuum hose on throttle bodies

2K views 21 replies 7 participants last post by  novavalve 
#1 ·
where do you drill and tap the hole for the the brake vacuum hose on direct to head throttle bodies?
 
#7 ·
i used a 5/8 UNF tap which wasthe nearest tap i could find, then i wrapped the union(from a 1.3sr inlet manifold iirc) in ptfe tape and tightened it in, job done, no leaks!
 
#9 ·
Re: twin engined nova

novavalve said:
doesnt it disturb airflow to No 4 cylinder?
erm, depends whose website you read! sbd reccomend doing two samller feed from say 1 and 4 but i amongst others haven had any probs with just the one, after all carb'd inlet manifolds have used just the one for years!
 
#10 ·
i got the body tapped today, looked everywhere to buy a tap and couldnt find a place to sell one, tried an engine builder, he didnt have one big enough. in the end i went into an engineering company and they did it for me, charged 20 quid though which i thought was a little bit steep but i spose it would of probably come to that if i'd bought a tap and drill bit. where do you get flexible vacuum hose from, i tried halfords today but they dont sell it
 
#15 ·
0ddball said:
ditto. make sure its proper vacuum hose, the walls are 2-3 times as thick as coolant hose, internally braided naturally. you dont wnat that mofo crushing down on itself !
too true, any solid brake pedal approching a roundabout too quickly gen??
 
#18 ·
looked everywhere again and couldnt find anywhere that sold vacuum hose that size, then i stumbled upon a place that makes silicon hoses and they sold me some in a nice blue colour:cool: . They also said they can make me a set of coolant hoses for my car so when its finished i'm gonna take it down there, dunno on price yet but a metre of the vacuum hose was 7 quid which i didnt think was bad
 
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