Technical > Spud Miller's Cave

Nozzles in head

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wideopen231:
My hemi heads have been drilled and tapped for down nozzles,used fuel heads.While reading post on rotary injectors I noticed few comment about nozzle placement.Most sem to think dry runner and port aided in increase air.Having read few things about amount of fuel in intake charge occupying area instead of air it makes good sense.

Is there any gain by using down nozzle location.Since its NA motor seems I could just plumb regular nozzles in that location.Not something I want to do from start,figure get good baseline tuneup then try few things and this could be one thing to add to list.

dreracecar:
My take would have to be the time it would take to fill lines and the fuel rails (huge volume)inside the head with pressure running a small pump

Paul New:
With spring check nozzle bodies it makes since to me the Sprint car guys have been doing it for years because it builds HP

wideopen231:
Volume no different than running nozlles in ports,as for rail it will require no more than what can get out.As for volume to fill on startup I have hard time seeing it being anything different.

Don't see why you would need spring check nozzles.They are doing same thing in head as ports except they are 3.5 inches closer and right above valve.Maybe somethingI am overlooking?With blower setup I can see need.

If there is reason explain,always ready to learn why something will not

dreracecar:
Built many a fuel rail for Nos top fuel cars running a 20gal pump,down load always showed a small pressure drop at the hit, went back to individual lines and it disapeared.
  Sprint cars are a different animal since they rely on a rolling start before they mash the throttle

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