SR16VE vs SR20VE head Differentiate
Just try get some comparison between both

The obivious differentiate is the cam
but other option

Intake manifold ?
throttle body ?
Valve spring ?
retainer ?
headwork and flow ?

since i have one query about the JWT valve spring for VE
since it mention that allow SR20VE rev to 8000 safely
but SR16VE already can rev 8200 ..
mean putting a SR16VE cam on SR20VE you need the 16VE valve spring and retainer as well or else it wont rev safely to 8200 ?

From the info I found by searching, the 20VE and 16VE heads are the same. Only difference is cams. The SR20VE stock cams have very steep ramp angles. Ramp angles determine how fast the valve is opened, steeper = faster. This is hard on valve springs and will float a valve quicker than the less steep 16VE cams.

If the JWT springs allows the 20VE with stock cams to rev to 8000, then it should allow the 16VE to rev even higher. (i could be wrong on this)

"If the JWT springs allows the 20VE with stock cams to rev to 8000, then it should allow the 16VE to rev even higher"

yes.. that something i interested to debate at here

Well, in the shake of debating... NO, they would not.

I will ignore the low cams since they prsumably do not enter the "equation" since they are switched out at ~ 5000rpm+ and only consider the high lobes.

I will also ignore the SR16VE-N1 cams and the SR20VE(20v) cams since they are very rare.

SR20VE - Intake - High lobe:10.7mm lift @ 264 duration
SR16VE - Intake - High lobe:11.1mm lift @ 280 duration

Here it is a tossup. Slightly higher lift (+0.4mm) and a higher duration (+16 degrees). I would guess that the cam ramps for the SR16VE would be very close to those of the SR20VE, maybe just a bit more radical. If I had to guess, the 16VE cams would need "more spring" than the 20VE cams but it would be very close anyway.

SR20VE - Exhaust - High lobe:10.34 mm lift @ 268 duration
SR16VE - Exhaust - High lobe:11.1mm lift @ 280 duration


Here we have more difference. Higher lift (+0.76mm) and a higher duration (+12 degrees). I would guess that the cam ramps for the SR16VE would be certainly more radical than those of the SR20VE, and again, if I had to guess, the 16VE cams would definitely need "more spring" than the 20VE cams.

Chris

Does sr16ve gti-r got the N1 cams ? i mean nissan sunny gti-r 1.6 engine

GTIR does not come with any VE motor.

Well, in the shake of debating... NO, they would not.

I will ignore the low cams since they prsumably do not enter the "equation" since they are switched out at ~ 5000rpm+ and only consider the high lobes.

I will also ignore the SR16VE-N1 cams and the SR20VE(20v) cams since they are very rare.

SR20VE - Intake - High lobe:10.7mm lift @ 264 duration
SR16VE - Intake - High lobe:11.1mm lift @ 280 duration

Here it is a tossup. Slightly higher lift (+0.4mm) and a higher duration (+16 degrees). I would guess that the cam ramps for the SR16VE would be very close to those of the SR20VE, maybe just a bit more radical. If I had to guess, the 16VE cams would need "more spring" than the 20VE cams but it would be very close anyway.

SR20VE - Exhaust - High lobe:10.34 mm lift @ 268 duration
SR16VE - Exhaust - High lobe:11.1mm lift @ 280 duration


Here we have more difference. Higher lift (+0.76mm) and a higher duration (+12 degrees). I would guess that the cam ramps for the SR16VE would be certainly more radical than those of the SR20VE, and again, if I had to guess, the 16VE cams would definitely need "more spring" than the 20VE cams.

Chris

your maths is flawed, it in no way calculates ramp rate

sr20 valve springs and sr16 springs ARE the same.

the sr20 cams can safely rev to 7400-7800 on standard springs (there are actually two types standard), where and sr16 cams get nearly 1000rpm more safely due to RAMP ANGLE OF THE LOBE, not duration or lift. You can work out the ramp angle from the duration or lift specs. sr16ve n1 cams can rev higher again.

just fyi people have reved up to 10,500rpm on the bc h22 springs