Jump to content
SAU Community

Recommended Posts

Skyline r34 gtt (rb25det neo)

I just installed some tomei poncams type b 260 degrees 9.15mm lift and as stated by tomei no need to upgrade the valve springs.

i also installed the adj cam gears but only the exhaust side would fit, intake cam gear didnt match the intake camshaft. so i just used one old and one new

the timing is perfect and the knock is only on idle and coming from the exhaust side.

at first i thought it was the CAS but not too sure.

im running stock afm and injectors at the moment but will upgrade once the knock has gone and it hasnt been tuned yet but that shouldnt cause a knock.

any help or suggestions would be much appreciated.

Link to comment
https://www.sau.com.au/forums/topic/404757-tomei-poncams-type-b-engine-knock/
Share on other sites

If its an r34 neo engine, it has solid lifters

This!!

They should be a drop in application, if you have done that and have the Ex gear set right it should be fine... Mine are sweet :)

This!!

They should be a drop in application, if you have done that and have the Ex gear set right it should be fine... Mine are sweet :)

Just for future reference, whilst they may "drop in", valve clearances should be checked and re-shimmed as required.

Yep, nissans clearances will be a better guide. and 'close enough' isn't good enough either keep in mind too much it'll slap the valve up and slam it on seat, too little and the valve wont get enough time on the seat to cool.

Actually the initial/final ramp rate has a lot to do with choosing clearances.

Having said that, going from Nissan's 0.2 - 0.25 sort of clearance to the 0.45 territory suggested by Tomei sounds like madness. You might add 0.05, not more than double.

Edited by GTSBoy

Don't trust those stickers, as part of compliance there has to be a sticker mentioning timing, clearances etc. Well mine says BTC of 15degrees (RB25), which if you know RB26's actually run a BTC of 20 degrees.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Kinda glad I never got to this ..    https://www.facebook.com/groups/1483859159195077
    • @GTSBoy This method was able to get readings of -10 to -2, so it looks like its monitoring.  Now I need to figure out why the vacuum on the line provided isn't alternating with manifold pressure.  I went with 2 lines that an RB25 tuner recommended but I'll get a longer hose and try directly off the back of the manifold.  He may have been used to OEM intake setups while I have a DBW setup that removed the MAF and IACV.  
    • I work at a car detailing and tinting shop called Quark which gets all manner of German cars in usually (mainly due to a contract with Mercedes Benz Kita Osaka, BMW Nishinomiya and others) but every once in a while something special comes in, like a fully restored 1972 HS30 Nissan Fairlady 240ZG... The shop owner had immediately started applying film to the windows as soon as it was in the shop so the interior was completely covered in towels and plastic sheets. But I could get a few photos of the engine bay which was restored like new. Such an amazing car to see in pristine condition in Japan these days.  
    • Was going to say the car pulls up nicely everywhere, especially going into that last long right hander before the main straight. Looks like a lot of fun.
    • Hey Dave, welcome aboard! Good to see another soon-to-be Stagea owner here. The wagons are awesome — plenty of space, still got that Skyline DNA, and loads of potential if you’re into mods. Definitely post up pics when you get it, everyone here loves seeing new builds. What model/year are you looking at?
×
×
  • Create New...