Thread: Please Post Up If You Have A SR20VE Motor With N1 Cams On Stock Springs & Retainers

are the late model ones stiffer then? if so could you do an all nissan upgrade ising later model single springs with early model inner springs?

yes you can.

Seat pressure increases close to 90lbs

On the nose close to 180 odd.

going of track here but is there a list of the different nissan valvespring rates and sizes? are DET springs tougher than VE springs?

just really angling for ideas on how to make the toughest all nissan option..

Really interested on that shim work. More spec?

three options using factory parts!


Shim the base of the standard 16/20VE double springs. This will increase your seat pressure and let you be safer on N1's.

Second option is to use 16/20VE inner spring with 20V outer spring.

Third is the same as above but shimmed at the base. This is really not needed as any cam that needs this sort of ramp rate would be pushing the max lift capacity of the springs, be chewing HP and you would need to swtich to a conical spring for better effectiveness. Maybe if you were runnign quads and went for stupid duration but N1 levels of lift this would be ideal.

I just bought N1 cams. Will limit the revs to 8500 rpm. Using stock SR20VE springs & retainers.

How thin the shim should be?

we are only talking up to half a MM or maybe a tad higher if your brave.

Based on how much you machine the seat you will need to calculate it.

When I get my N1 as soon as Greg gets them in. I will be running n1/sr20ve stock valve springs and retainers!

Ok. So any machine shop with rlly good experience should know how to do this right. When I get my N1 cams ill go stock s&r shimed.