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i have a d16z6 planning to put in high compression pistons, bigger vlaves, port and polish and a big cam. i need some opinions on fuel rails and injector sizes please! im planning to use injector dynamics. ive heard real good things about their 1000cc injectors but not educated on proper sizes or fuel rail types.
 

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If you want to use id injectors I'm pretty sure they make something smaller than 1000s. 1000s are about 700 more ccs than you'll need though lol.
the smallest id injectors i have seen is 725cc...im running them in an all motor h22 pump gas with no problems...
 

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1988 Honda CRX
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I can't see an NA D16 needing much more than 250cc injectors, certainly no more than 350s.

While you can run real big injectors throttled back, you get better sensitivity and fine tune ability with the correct size. If it never gets above 40% duty cycle it's to big, if it gets over 80% duty cycle it is starting to work hard and bigger would be better.

A stock fuel rail will flow enough fuel for double the power you will ever get NA.

The higher performance Honda D series heads already have as big a valves as they need. I am not sure what is the maximum stock power for your head. If it's over 110hp, the valves are already big enough.
 

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1988 Honda CRX
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OK, I looked it up for you. I must be feeling VERY generous today.

D16Z6

VTEC

Found in
1992–1995 Honda Civic Si
1992–1995 Honda Civic EX, EX-V
1992–1995 Honda Civic ESi (European Market)
1993–1995 Honda Del Sol Si (US)
1993–1995 Honda Del Sol ESi (European)
Displacement : 1,590 cc (97 cu in)
Bore and Stroke : 75 mm × 90 mm (3.0 in × 3.5 in)
Rod Length : 137 mm
Rod Ratio : 1.52~
Compression : 9.2:1
Power : 125 bhp (93.2 kW, 127 PS) at 6,600 rpm
Torque : 106 ft·lb (14.7 kg/m, 144 Nm) at 5,200 rpm
Volumetric Efficiency : 87.68%
Redline : 7,200 rpm
Fuel Cut : 7,411 rpm
VTEC Switchover : 4,800 rpm
Fuel Control : OBD-1 MPFI
Head Code : P08
ECU Code : P28


127hp at 6600rpm. It already has the biggest valves it can use. To go bigger would require it to be bored out to get a benefit rather than a drop in airflow.
 

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upgrade to some RDX injectors if needed or just get a set of y8/z6 injectors since they are 240cc...
oh and youd be wise to heed the advice of pat...especially about valve sizing.

concentrate on good port work for better flow and building around that "big" camshaft you have yet to select.
speaking of which you may want to do that. build around what best suits the cam imo.
 

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Yep, 1000cc's should be good. Don't bother double checking me by searching, just take my word for it.

Oh and Fuel rail, biggest one you can find. ABSOLUTELY HUGE!!! 3 in PVC pipe if you can fit it.
 
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