Jump to content
SAU Community

Recommended Posts

hey guys just got my engine together and once it started. from around 3000rpm there is a rattle from the top end. at first it sounded like a broken valve spring. but at idle car is quiet. so decided to take head off and have it sent off to be inspected and checked. head came back a week later and turned out fine. all parts were inspected and checked for clearances. also in mean time i checked the piston heights incase it was a bottom end bearing. but motor before 26 head conversion was very sound. so head go's back on and start car up and noise is still there. now the ecu is a haltech elite witch has just got a base map on it. one person from the machine shop where the head was done. said it could be detonation ?  car is running e85 with 2200cc injectors. im just looking for some feedback or ideas. as this is got me stuffed and i dont wanna give the car to the tuner with issues

 

cheers guys

 

Link to comment
https://www.sau.com.au/forums/topic/473014-strange-rattle-rb2630/
Share on other sites

It won't detonate running no load, unless one of the injectors is spraying only a tiny % of what it is supposed to.  And even then, I wouldn't expect it to ping so that you could hear it and think it was mechanical noise.

And it will also be very unlikely to ping audibly on E85 anyway.

2 minutes ago, Rusty Nuts said:

Check the cam gear bolts, recently had a rattle in this area on a RB25 the bolts were clipping the inside of the cas.

ah ok ive heard this. especially when not running the cam cover. witch im not. i would of thought the noise would be from idle. not from certain rpm. but i will have a look at that. cheers mate

The same thing happened with mine, I think the camshaft is pulled fowards very slightly as revs increase, I found very very fine aluminium filings on the back of the cas. Otherwise did you have lifter bores checked they can stick if they rock in the bores. Were small end bushes new??

9 minutes ago, Rusty Nuts said:

There are small steel bushes in the cam belt cover that space the cas the correct distance. Make sure you have original mounting bolts for cam gear installed ,the original bolts have quite shallow heads. 

I did order the oem cam gear bolts from Nissan but ill check the spacing of the cas to gear tomorrow. Thanks for your help so far

  • 5 years later...

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

    • Have a look at that (shitty) pic I posted. You can see AN -4 braided line coming to a -4 to 1/8 BSPT adapter, into a 1/8 BSPT T piece. The Haltech pressure sender is screwed into the long arm of the sender and factory sender (pre your pic) into the T side. You can also see the cable tie holding the whole contraption in place. Is it better than mounting the sender direct to your engine fitting......yes because it removes that vibration as the engine revs out 50 times every lap and that factory sender is pretty big. Is it necessary for you......well I've got no idea, I just don't like something important failing twice so over-engineer it to the moon!
    • Yup. You can get creative and make a sort of "bracket" with cable ties. Put 2 around the sender with a third passing underneath them strapped down against the sender. Then that third one is able to be passed through some hole at right angles to the orientation of the sender. Or some variation on the theme. Yes.... ummm, with caveats? I mean, the sender is BSP and you would likely have AN stuff on the hose, so yes, there would be the adapter you mention. But the block end will either be 1/8 NPT if that thread is still OK in there, or you can drill and tap it out to 1/4 BSP or NPT and use appropriate adapter there. As it stands, your mention of 1/8 BSPT male seems... wrong for the 1/8 NPT female it has to go into. The hose will be better, because even with the bush, the mass of the sender will be "hanging" off a hard threaded connection and will add some stress/strain to that. It might fail in the future. The hose eliminates almost all such risk - but adds in several more threaded connections to leak from! It really should be tapered, but it looks very long in that photo with no taper visible. If you have it in hand you should be able to see if it tapered or not. There technically is no possibility of a mechanical seal with a parallel male in a parallel female, so it is hard to believe that it is parallel male, but weirder things have happened. Maybe it's meant to seat on some surface when screwed in on the original installation? Anyway, at that thread size, parallel in parallel, with tape and goop, will seal just fine.
    • How do you propose I cable tie this: To something securely? Is it really just a case of finding a couple of holes and ziptying it there so it never goes flying or starts dangling around, more or less? Then run a 1/8 BSP Female to [hose adapter of choice?/AN?] and then the opposing fitting at the bush-into-oil-block end? being the hose-into-realistically likely a 1/8 BSPT male) Is this going to provide any real benefit over using a stainless/steel 1/4 to 1/8 BSPT reducing bush? I am making the assumption the OEM sender is BSPT not BSPP/BSP
    • I fashioned a ramp out of a couple of pieces of 140x35 lumber, to get the bumper up slightly, and then one of these is what I use
    • I wouldn't worry about dissimilar metal corrosion, should you just buy/make a steel replacement. There will be thread tape and sealant compound between the metals. The few little spots where they touch each other will be deep inside the joint, unable to get wet. And the alloy block is much much larger than a small steel fitting, so there is plenty of "sacrificial" capacity there. Any bush you put in there will be dissimilar anyway. Either steel or brass. Maybe stainless. All of them are different to the other parts in the chain. But what I said above still applies.
×
×
  • Create New...