y are some bigger than others
is there a difference ?

 

Just a fact of life some people are larger then others

This is just a guess but from what I understand they are a hydrolic piston that locks the higher cam profiles so bigger engine larger Solenoid ... I could be way off though ... thats justa guess

 

Word, bigger cams = more pressure needed to switch over to vtec = bigger solenoid.

 

heres teh solenoids p72-2 head jdm gsr

heres teh pr3-1

pr3-1 is a b16 right y is it larger that my gsr 1?

 

The b16 needs more oil to move the cams where its a smaller head.

 

so what happens when u put that solenoid on teh gsr?

 

are we talking from forst to second? or b16a to gsr? maybe in time when technology caught up, they figured the duty cycle one them and could go down a little in size?

 

there both obd 1 parts

 

size doesnt matter

 

They will both work interchanged.

 

On 1st gen JDM b16a the VTEC solenoid is huge, way bigger than both of those. I have been trying to figure it out myself.

 

MORE VTEC!!!!!!!!!!!!!!!!!!!!!!!!!!

yeah, i upgraded to a JDM one and gained like 3 vtec points, 80 whp, and 37 ft/lb of torque at the headlights y0

 

Nice user name. Lmao!

 

B19civicHB has a d15 vtec-e engine solenoid on his built JDM GSR engine and it works like a champ. As long as it fits, it'll work fine.

 

It fits? The solenoids are interchangable from D-series to B-series?

 

yes