Jump to content
SAU Community

Recommended Posts

Hello,

I recently purchased a r33 from a person for really low cost knowing that there was bugger all compression in one of the cylinders, i done a compression test all 6 before i payed bugger all anyway just to check.

(i have suspected bent valve or it is not seating correctly 100%)

after pulling apart at the motor for a good day i finally got the head off and checked the valve faces, there was one valve (exhaust) in the cyclinder that had no compression that caught my eye immediatly due to it's colour difference from the rest.

it didn't have an obvouis bend or miss-seat, so i poured some oil down the exhaust exit to see if it will trinkle out the valve, still nothing after 5 mins....i have left the head sitting on it's side with all exhaust exits filled with motor oil to see if any would leak after a few - 24 hours.

am i doing the right thing?

could there be another reason for the problem?

in other words....help!! lol. :P

and also what is the best valve spring compressor to buy and where do i get it from because it is hard to find one that suits the rb25 bucket like spots where the spring seats......

thanks,

reece.

Edited by ReeceGTS-T
Link to comment
https://www.sau.com.au/forums/topic/432626-compression/
Share on other sites

Had an instance many years ago with a L-series engine. One of the rocker arms had a small -ve clearance, ie too tight, which caused 0 compression. Setting the clearance correctly bumped the com,pression to 170 or so.

So, yes, the slightest gap in the valve seat can cause a massive loss of compression.

Link to comment
https://www.sau.com.au/forums/topic/432626-compression/#findComment-7047091
Share on other sites

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

    • Hey. Very valuable information about pitwork, I will pay attention when buying any consumable parts 馃檹 As for the carpets - I got a handful of information from nengun, from which it appears that indeed the carpets for the driver's side are OEM. They are not able to show me any pictures due to the long chain of different sales entities but after I place the order, as soon as the goods arrive at the nengun warehouse from which they will send the shipment to me they can send me photos and if my purchase differs from OEM I can immediately return it / cancel the purchase. I think I will give it a try 馃槈. Of course i'll let you know what's what as soon as i get them P.s. I know the topic is not relevant to the thread, but both nengun and amayama have these SICK 馃槏 trunk room lamps available. Do you know anyone who ordered them? I need to have one in my car
    • I've managed to find this: Nissan_Stagea_AutechVersion260RS (1).pdf
    • I believe @Duncan has given it a crack at Mt Buller before (in actual race conditions)
    • All my Polish car culture insight comes from watching Nightride. So I half expect this to get 1UZ swapped eventually?! Are you going to drive it in winter? I'm always curious how ATTESA would hold up in the snow. There isn't that much opportunity to try it in Australia.  
    • My steering lock unit on my Infiniti G37 has failed. The car is a local 2012 Infiniti G37 (Q60 ) I need to replace the unit My local mechanic said i need to buy a complete steering wheel assembly. Does anybody no any mechanics in Gold Coast or Brisbane who can fix this issue or where i can buy just the Steering lock control unit. Thanks
  • Create New...