Valve Springs And Boost Levels ?

[mondy1]

Was having a conversation the other day with someone regarding skylines and the conversation went over to boost levels etc.

one of the parts of the conversation was about high boost levels blowing open the valves

is it possible for high boost aplications say 2 - 2.2 bar blowing the valves open?? what sort of boost pressure would it take to blow open a standard valve spring i was running 1.7bar on my standard head with uprated cams and never got a problem

[bigcarl]

i ran 22psi with standard valve springs and tomei step1 poncams only started to float at 24psi and over 7000rpm.

[infected flow]

Was having a conversation the other day with someone regarding skylines and the conversation went over to boost levels etc.

one of the parts of the conversation was about high boost levels blowing open the valves

is it possible for high boost aplications say 2 - 2.2 bar blowing the valves open?? what sort of boost pressure would it take to blow open a standard valve spring i was running 1.7bar on my standard head with uprated cams and never got a problem

2.2bar even on 2bar they would be pushing open.....

[R31Nismoid]

24psi here with stock cams

No issues for the 8 months before i sold the motor.

[mondy1]

cheers for the info guys

I think im going to order a set of tomie springs to be on the safe side

[grandmasterb]

Im in the a similar situation at the moment Brett where i have order 264 cams for my RB and trying to work out if the 9.0 lift is too high for the stock springs!!!

At the moment it looks like that they will be which is going to be a bugger cause i cant afford (haven't got any good quotes) for upgraded spring kit...

Can anyone out there with an RB20 (or other RB) shed any more light on my problem???

Cheers GMB