cute wee gem Posted May 14, 2009 Share Posted May 14, 2009 What exactly is this? basically there is one in each intake port and they run through a tube to the intake before the TB. Keen on ditching these asap Also, if I get them out, can I weld them up myself or will normal ali filler rod not work too well with the head? Quote Link to comment Share on other sites More sharing options...
cheater_5 Posted May 14, 2009 Share Posted May 14, 2009 Its where the naws gets injected Quote Link to comment Share on other sites More sharing options...
lowlancer Posted May 14, 2009 Share Posted May 14, 2009 Edit: Nah not jet valve Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted May 14, 2009 Author Share Posted May 14, 2009 Definitely didn't notice anything out of the ordinary when taking rocker gear off. I'll have to have a decent look at the inlet manifold as to if there is any valves in the line. Ze engine is turbo is that helps any. I think you could be on the right track though sir smelliot. Went to start porting today but noticed these horrible protrusions so I just had a quick maz instead. Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted May 14, 2009 Author Share Posted May 14, 2009 "The 4ZC1 engine has a hose that runs from in front of the throttle body to the intake manifold right next to where it bolts to the cylinder head. This is kind of interesting, the 4ZC1 has a passage in the intake manifold/cylinder head mating surface that feeds air into little pipes that extend into the cylinder head intake ports right at the valves, probably to modify the airflow characteristics under boost. The 4ZE1 does not have this passage, you just have to plug off that air hose." All I can find is guesses. So I may just take them out, now someone answer my welding question Quote Link to comment Share on other sites More sharing options...
Unclejake Posted May 14, 2009 Share Posted May 14, 2009 I don't know what the pipe is for as it is probably metric but I wouldn't touch it with a welder. I would tap the hole and locktite/glue in a threaded plug and then grind it smooth if you are desperate to remove them. Alternatively leave them intact and connected as the factory intended Quote Link to comment Share on other sites More sharing options...
Yowzer Posted May 14, 2009 Share Posted May 14, 2009 Alternatively leave them intact and squirt some nitrous though them Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted May 14, 2009 Share Posted May 14, 2009 use for nos haha Quote Link to comment Share on other sites More sharing options...
Unclejake Posted May 14, 2009 Share Posted May 14, 2009 Alternatively leave them intact and squirt some nitrous though them Good idea Quote Link to comment Share on other sites More sharing options...
Burntrubber Posted May 19, 2009 Share Posted May 19, 2009 Pretty sure there just an emission's thing I left mine in and blocked them off etc and its fine. Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted May 19, 2009 Share Posted May 19, 2009 any good idea/benefits of blocking/smoothing off the injector cutouts on a 4g63 head? ps. sorry for hijacking Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted May 20, 2009 Share Posted May 20, 2009 any good idea/benefits of blocking/smoothing off the injector cutouts on a 4g63 head?ps. sorry for hijacking lol no place for injectors, jokes u obvisously hav other plans for fuel. Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted May 20, 2009 Share Posted May 20, 2009 any good idea/benefits of blocking/smoothing off the injector cutouts on a 4g63 head?ps. sorry for hijacking lol no place for injectors, jokes u obvisously hav other plans for fuel. 1.2.3.4 carburetters hangin off the side PLZ but would i have and gains from filling said holes up with resin? and smothing out or just slam some caps over the holes and be done with it Quote Link to comment Share on other sites More sharing options...
mikuni Posted May 20, 2009 Share Posted May 20, 2009 Tom, can you just knock the pipes out and weld up the alloy holes that remain and then smooth them out? I would think that would be worth it in the long run. I can't think of a reason why having air at/near atmospheric pressure in the intake ports would be a good thing but I'm sure someone thats smarter than me could point out possible reasons. Perhaps just an emissions thing? but would i have and gains from filling said holes up with resin? and smothing out or just slam some caps over the holes and be done with it I've thought about this before also. I would think that the void that you would have with a carburetor type manifold on there would create some losses. The injector area is only left there from the factory to save money on head casting so that they can run efi or carbs without having different heads so removing it won't lose anything, the only question is will it actually show any gains in removing it? Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted May 21, 2009 Author Share Posted May 21, 2009 I tried hitting a nozzle out last night with a punch but didn't want to hit it too hard in case I smashed it up. It would be a bit silly being there if it was at atmospheric pressure, it wouldn't even work unless it had a pump of some sort, probably what the turbo hanging off the other side is for. I just need to make my mind up whether I want to get rid of it before I put the head on finally, saves buying a new head gasket. Got a spare fucked Toyota head here I might try and weld for a practice run. I'll cry if it ruins the actual head I'm working on though. Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted May 21, 2009 Share Posted May 21, 2009 is it steel or brass? could just grind it back and braze over it? might be safer Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted May 21, 2009 Author Share Posted May 21, 2009 Brazing won't get rid of the indent in the alloy though, I just wanted to make it completely smooth as if it was never there. Epoxy might be the best option, or get someone to weld it and fill it properly for me to grind smooth. At this stage it looks as though I'll just leave them, had a go at porting this head today and my micro grinder can get around it pretty easy, plus I don't think it will effect flow much at all as it's parallel with the air stream if that makes sence. My amateur porting is probably screwing it all up anyway Might have a play when it's all up and running, run it un-blocked and see what difference there is. Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted May 21, 2009 Share Posted May 21, 2009 probably going to resin mine up, just need to find a resin that is fuel and heat resistant and wont drop out at 9000rpm Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted May 21, 2009 Author Share Posted May 21, 2009 JB weld sounds like the go, or Loctite metal set Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted May 21, 2009 Share Posted May 21, 2009 have you thought about plugging your hole eg press fit a pin/plug and grind it smooth? require no welding/destroying Quote Link to comment Share on other sites More sharing options...
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