JDMFairlady21

iTrader: (9)

dont worry rich, you're efforts will always be remembered and used as a reference for the rest of us N/A guys! you are pioneering another way for us!

phunk

iTrader: (21)

Richie,

Looking good over there! We will be in touch soon

plumpzz

iTrader: (10)

you can't use vk45 ti valves..they're 1mm smaller in diameter..

Z350Lover

iTrader: (2)

thanks guys.... we shall continue our researches into better valvetrains and hopefully we will have the car back soon very soon!

charles, for sure! Keep in touch!

plumpzz, thanks for that... I realised it was not gonna work with 1mm smaller in diameter... and does anyone know what's the max. rpm that Ferrea valve springs can hold up to?

cheers,

richie

mchapman

iTrader: (1)

Richie,

Love the preliminary dyno results, that looks very promising and very similar to the expected change. Sorry to hear about the valve float though. Im surprised valve float appeared, as you mentioned the springs are rated for 11+mm lift and I was under the impression they were designed to work with the other Nismo racing parts which are designed for higher rpm use, like the 8000rpm crank etc.

We need to find out the rpm limit of the Ferrea springs at 10.5-11mm lift, ive emailed SGP and Ferrea to see if they can shed some light on the subject. Looks like i'll need to buy another set of valve springs also.

Murray

Z350Lover

iTrader: (2)

Murray:

Nuff (Jarek) has already worked out the valve spring rates for Ferrea already... and they are around 28% stonger than nismo springs (and JWT springs are 6% stronger than nismo ones)... Ferrea springs can even go up to 12.5mm lift... so I am just not sure with 28%, is it going to hold up to 8000rpm?!

Also found the weights of Ferrea size standard valves for our engine from Carl @ xtremeracecar.com as well...

Stock Intake Valve: 51.4g
Stock Exhaust Valve: 46.8g

Ferrea Intake Valve: 53g
Ferrea Exhaust Valve: 42g

Carl is using Ferrea valve/spring/retainer package on his drag racer and apparently they are holding quite fine even up to 14000rpm (if I didn't hear it wrongly on the phone with noisy background in the office)

Added:

Nismo can run those springs without problem up to 8000rpm because the titanium valves that they are using WITH the Nismo Cylinder heads are A LOT lighter than the stock valves... and that will affect a lot actually... but since I am not running nismo heads, so no titanium valves for me...

cheers,

richie

mchapman

iTrader: (1)

Cool,

I was under the impression that the Nismo springs were stronger than the JWT.

Simon should know if a 28% increase in spring rate is going to be enough to sustain 8000rpm based on the Nismo spring specs and how they performed in the real world.

I cant see the benefit of getting the Ferrea valves for an NA motor based on those weights.

thawk408

iTrader: (16)

The valves are 1mm bigger. I am not sure if this would make a big difference on NA tho. Maybe with the head/valve polish job the bigger valves may help alittle.....

Z350Lover

iTrader: (2)

thawk408:

You can get Ferrea valves in stock sizes as well.. and those weights are actually off the stock size Ferrea valves... I am just a bit confused on the weight... why would the exhaust valve be lighter while the intake valve is heavier than the stock items?! just weird...

And if you go for 1mm oversize valves, you will need some head works too... need to bore those intake/exhaust valve channels a bit larger I think.. that means more $$$

1mm smaller as VK45 engine's valves cannot be used as suggested by Peter and many other people... and 1mm larger is gonna cost more money to make just a bit more power... so I guess I will just stay with the factory size then... The most important thing is that if the Ferrea springs can prevent valve float at 8000rpm...

cheers,

richie

JeffesonM

here is some random VQ info... http://forums.maxima.org/showthread.php?t=362910

Z350Lover

iTrader: (2)

Jeff,

Thanks a lot for the information... I will look into that now!

cheers,

richie

mchapman

iTrader: (1)

Richie,

Got another confirmation that the Ferrea valve springs can take 10,000rpm @ 12mm lift from Mark at SGP. I will be using the Ferrea valve springs with the Titanium retainers and the stock stainless valves as this is the minimum required to use their springs.

Z350Lover

iTrader: (2)

Murray,

Thanks for the info! I will be using Ferrea valvetrain set in standard size

I got the confirmation saying that the standard valves aren't that strong due to two piece configuration... and I wouldn't feel like to take my chance and allow to have things like that happens again in the future... so I'll just bite the bullet and spend a bit more for those valves...

And with Ferrea valvetrain set, they are fine for 10,500rpm at 1500hp on the drag car... those valves are slightly stronger than those Ferrea valves for the standard factory valves

cheers,

richie

thawk408

iTrader: (16)

I know the Ferrea sport springs can take 10,000rpms, but I think the ones they are offer for our cars are not the sport. I tried to look at there catalog, but could not find the 350z on there. I read somewhere that 7300 is the max, but can't remember where I read that. I will try to find it.

Z350Lover

iTrader: (2)

btw.. what's recess tip as one of the valvetrain components??

According to Ferrea, if I am going to use their valves and springs, I don't need to use recess tip.... and what exactly is that? I have very limited knowledge here... please help and explain... Thanks

cheers,

richie

mchapman

iTrader: (1)

Damn, I wonder what the limits are of the stock valves??

Maybe heat treating and cryo treating them would help?

Anyone know more about two piece valve configuations and how they are limited?

I dont really want to get the whole valve train kit, I need to draw the line somewhere.

phunk

iTrader: (21)

I could be off on my numbers, but my descriptions should be accurate.

Stock valves are, I think, 6mm valve stem that tapers to a 5.5mm just before the valve lock recess. So the retainer and locks are meant for 5.5mm valve stem.

Ferrea has valves that are just the same, 6 to 5.5mm stem thickness.

Ferrea also has straight 6mm valve stems for when you use their retainers and locks, which are setup for 6mm.

jakesford

Damn, i'm kinda surprised with those numbers, I would figure you would get bind and valvefloat with those numbers...

Z350Lover

iTrader: (2)

Charles,

I think you are correct there with those numbers.. that means when using Ferrea valves, we don't need to use factory recess tip as those tip will not fit into the larger 6mm valve stem, so the retainer (6mm) just goes directly on top without the recess tip... am I correct?

cheers,

richie

phunk

iTrader: (21)

well that depends on what you purchase. ferrea makes a set of 5.5 or 6.0 parts. so just make sure that you go with all 6.0 or all 5.5. actually i think that ferrea valves only come in 6.0 meaning that if you use their valves then you only have the option of 6.0 everything... and then the 5.5 stuff is for those who want to use stock valves