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Kalin August
Tinkerer
NSW
JZZ30 TT

Posts: 30
Reg: 04-2013

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Sunday, February 09, 2014 - 11:37 am, by:  Kalin August (Supple_k) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi,

I'm just very curious does the Auto Soarer 1JZ Valve Bounce ??
Or do they just keep revving to there limit and that's it ?

Nothing sounds better when they Valve Bounce. And I know it's not good for them but just wanted to know...

Or will the Bee R Rev Limiter work at all ?
Matthew Sharpe
Goo Roo
North Island
JZZ31

Posts: 6920
Reg: 10-2005

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Sunday, February 09, 2014 - 02:14 pm, by:  Matthew Sharpe (Madmatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Kalin August wrote on Sunday, February 09, 2014 - 11:37 am:




Can't say on the 1JZ as I don't own one - but in my experience, valve springs can suffer metal fatigue after enough duty - this has certainly caused valve bounce in a high performance engine I had. I ended up having the cylinder head totally reworked and installed uprated valve springs (and oversized valves as I had it ported), problem solved.

Anyhoo anecdotes aside, I think that rev limiter or not, it's possible that a tired set of valve springs could cause bounce.
Robert Day
DieHard
victoria
v8 & TT

Posts: 676
Reg: 01-2007

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Sunday, February 09, 2014 - 03:50 pm, by:  Robert Day (Lexsmaz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Kalin August wrote on Sunday, February 09, 2014 - 11:37 am:

Nothing sounds better than when they Valve Bounce




Are you sure its valve bounce you have heard as personally I reckon it makes a car sound when it happens, do you maybe mean Rev limiter ?? Two totally different things though ..

In answer to your question I'm sure it could happen to the 1JZ but they seem to run some pretty good valve springs from the factory so it doesn't seem to be a problem & not sure why you mention an Auto as it doesn't make any difference if Auto or manual ..
Kalin August
Tinkerer
NSW
JZZ30 TT

Posts: 31
Reg: 04-2013

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Sunday, February 09, 2014 - 05:02 pm, by:  Kalin August (Supple_k) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks guys…. just curious
Blake Gloyn
Goo Roo
manawatu
soarer JZZ30 TT

Posts: 1095
Reg: 02-2006

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Sunday, February 09, 2014 - 05:59 pm, by:  Blake Gloyn (Blakenz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

in my opinion, you can't hear it, it just means you don't make as much power as you would expect in the upper revs. More common on a high km 1jz or perhaps one that has been cooked.
Robert Day
DieHard
victoria
v8 & TT

Posts: 677
Reg: 01-2007

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Sunday, February 09, 2014 - 06:31 pm, by:  Robert Day (Lexsmaz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I must admit I have never heard it on a turbo car, so not sure if the turbo's stop some of the reverberation noise, but what I have found on a NA car its not a case of making as much power as you expect, it just goes flat & drops off power too & will not rev past that point either, similar in that way to a rev limiter ..

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