Jump to content
SAU Community

Recommended Posts

I've been told by the bloke who worked on my head that upon removing the cams you must bleed the lifters as they can pump up slightly.

If the lifters have pumped up slightly and you install new cams it will cause the valve to open slightly and possibly kiss the piston resulting in a stuffed valve.

On that note, he didn't mention it BUT I have read here and there that to get around this problem some have spun their motors 10degree's off TDC, installed the cams and its all been good.

So becareful. :laugh:

Those interested...

I think the cheapest way out of an aftermarket set of cams is to grab a set of GTR cams, send them off to LukeVL (from calaisturbo.com who works for or owns, Tighe Cams in QLD) and have them reground to your requirements.

i wish this was mentioned about 2 weeks ago...... DAMMIT.

would have saved me some money

  • Replies 285
  • Created
  • Last Reply

Top Posters In This Topic

i wish this was mentioned about 2 weeks ago...... DAMMIT.

would have saved me some money

Just got my car back together and running. Cams work fine, I dont see the big fuss.. Really just gotta take your time and make sure the cam caps/journals are smooth, and the cams arent bent. Most time consuming part was finely sanding the bolts to fit better in the cam caps.

Worst idle EVER! I've heard cammed LS1's idle better than this!! If I knew the idle was going to be this bad I would have gladly paid DOUBLE for the cams even if they didnt make any more power! Sounds like a drag supra! Its the truth, the sound is the real gain! Now, when I time the car properly, fix my humungous boost leak, and adjust the idle a little, I'm convinced the that idle is just going to be a little rougher than stock... but seriously dudes, you're modding a car for higher HP (kw's, whatever..), sacrifices must be made.

I'll post my power gain impression once I work out these few issues.. I'm still convinced I described the important part of the payoff of these cams though (sounds).

Great thread guys, a few bits of info in here really helped..

Thanks Dudes!

-Max

Have you driven it yet? The car i tried it on, we got it to idle(lumpy) but the car lost about 50% of its torque up to 3-4000rpm, didnt bother revving it any harder

I used rb20 cam caps.

I have only driven it slowly.. but I did get on it in first, twice, which broke the tires loose about 4000 rpm. I havent timed the car yet and I left a BOV unplugged, so I've got 2 huge problems that are sucking power..

Yes my car has basically no torque now.. I dont see how people do any cam upgrade in an rb20 and get this bad of low end.. I dont buy it just yet, I'm gonna fix my boost leak and time the car properly and then give you an accurate power opinion.

I used rb20 cam caps.

I have only driven it slowly.. but I did get on it in first, twice, which broke the tires loose about 4000 rpm. I havent timed the car yet and I left a BOV unplugged, so I've got 2 huge problems that are sucking power..

Yes my car has basically no torque now.. I dont see how people do any cam upgrade in an rb20 and get this bad of low end.. I dont buy it just yet, I'm gonna fix my boost leak and time the car properly and then give you an accurate power opinion.

r33 rb26 cams btw

Lol, that exhaust is a 3.5" from the turbo elbow back.. Its still to quiet! The Nur spec can's sound deadening is completely gone too...

I like cam idles, so it sounds cool to me... but yeah, unhealthy at the same time.

It's just this "howl" sound that kinda makes me a bit iffy/makes it a bit hard to hear. Mine is obscenely loud (well, almost), so maybe that'd make all the difference :(

Anyway, i might actually seriously look into this, not for the sound, but for the "mild" performance gains (for the meantime, untill i get a serious engine build going).

I dunno, but surely a sound like that can't be that healthy with such "minimalistic" cam profiles? When you look at the specs it's really nothing huge. Have you managed to check everything out yet?

I mean, i was expecting a lumpy idle, just not one of a high lift and duration equipped drag car. Kinda sounds like it doesn't know if it wants to die or keep running. I dunno, still very hard to hear as it's not very clear.

  • 3 weeks later...
ya give us an update :rant:

Moved away for school, ran out of money... Put the stockers back in.

I found out the lobe center angle is slightly off of the stock rb20 cam specs.. thus the massive overlap, horrible idle, and not much top end.

If I didnt run out of money for cam gears I would have continued.. Cams are on the shelf untill I come across a few hundred $$.

I dont want anyone to become discouraged about this swap, I'm still supporting the fact that its a very worthwhile upgrade. The second time I swapped cams I did it in about 1/5 the time.. Its easy, just use common sense...

...and get cam gears!

Sure, it is a very worthwhile upgrade.

That is, if your only aim is a lumpy unstable idle, loss of low end torque, diminished fuel economy, and about 1/2 a Kw improvement at the extreme top end.

But hey, if you guys only want a hot SOUNDING engine, instead of something that is actually more powerful, and you are having fun, go for it...

Sure, it is a very worthwhile upgrade.

That is, if your only aim is a lumpy unstable idle, loss of low end torque, diminished fuel economy, and about 1/2 a Kw improvement at the extreme top end.

But hey, if you guys only want a hot SOUNDING engine, instead of something that is actually more powerful, and you are having fun, go for it...

Funny joke, If you want to try to act smart next time, you could read my post and maybe understand what I said. Have you ever driven a car with messed up cam timing, of course its slow.. The rb26 cam lobe centers arent even the same degree as stock. Put a set of cam gears on it and set the timing, even to stock.. and if you dont think .7 mm higher lift and 8 degree longer duration is a worthwhile upgrade... well then you're retarded :rant:

Geezus Max, Warpspeed has probably forgotten more then you hope to know. He isn't being funny, just very matter of fact.

I've done this in an RB25DET and the result was total pox until the rpm hit 4500+, then it lit right up and for a car that was fairly dedicated for track, but still road driven it was still too much compromise.

At the end of the day the problem is and always returns to the fact that the cams' ramp angles are not ground correctly for hydraulic lifters. This results in early cracking of the valve seal and loss of compression regardless of lobe angles.

But then some of us here have so little experience that we must be completely without a clue.

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

    • The hot exhaust light will come on not from just the cat being blocked, but it's just a temp sensor, and it's designed to warn you to not do things like park in long grass.   If you've been pushing the motor a bit, it can cause the light to come on.   Second if the cat is rattling, I'd suspect it's not blocked, but instead falling apart inside.   The easiest "fix" until you can get a cat put back in, is to unbolt your one, bash the rest of the insides out, and then bolt it back in.   For a daily driver/street car, I am in agreeance of put a cat in the car. If it were race car I wouldn't care if it were removed.
    • No worries at all 🫡 I think the most satisfying things to make are the little bits that are just impossible to find or they're no longer manufactured. Generally I always try to replace parts with OEM wherever possible. This little project is also great because it'll never see the light of day, but strengthen these brackets so it's not just relying on the little standard screws in the headlight plastic. As soon as I saw the standard brackets and screws I thought, "well I'm not going to install with just the screws, the plastic tabs will just snap off". It's crazy how expensive everything has become yeah. But I suppose that's supply and demand; granted it's a lot easier to get brand new genuine parts these days which is fantastic 😊, I don't have to get totally reamed at the local Nissan dealer ha ha We sure are lucky we have all these manufacturers making parts these days, a few really great Australian companies too like Platinum Racing Products and Fit Mint Automotive, what a time to be alive ❤️ . I've got my eye on the RB26 head by PRP as mine has a very fine hairline crack, so that'll need to be addressed some time in the future. If you have any requests or odd things to make feel free to let me know and I can have a crack at making replacement parts ✌️
    • Thanks for sharing this, and BTW if your headlights are in good condition they are worth thousands....you might want to consider replacing them with brand new LED ones like this (https://www.nengun.com/78works/full-led-headlights-r32-skyline) and making enough profit to buy a house in Sydney
    • I'm not sure what sort of shops are nearby, but I'd expect any reasonable exhaust shop could put a cat in it that will not restrict the power that engine makes. Otherwise, if you want to remove it, short lengths that replace the cat are readily available online, search for "de-cat pipes" or "test pipes"  
    • Howdy friends, So another weird one today, I was looking into replacing some broken clips holding the front grille for the R32 GTR (part number 01553-03831), and noticed the brackets which are supposed to hold the grille in place were also missing 😑. I do recall seeing this issue many years ago, but didn't fix it at the time. A quick look on eBay and I was able to find the genuine brackets, along with all the screws which suited the headlights (part numbers 26042-08U05,26092-08U05). Happy days!....  Once they arrived however there was an extra nut in the packaging which implied that there should also be a bolt or a stud, and sure enough, after a bit of searching I found this thread from 2013, and @Ants clearly shows a stud should be present. Reading around a bit more, it's possible the headlights on my car are the "povo pack" headlights as mentioned by @funkymonkey in this thread way back in 2008. This could explain why the studs are missing on my set of headlights. Looking at the headlight diagram I wasn't able to see a suitable part number for the stud itself. The headlight did indeed have a recess that looked like it would accept a stud, but interestingly no thread or anything obvious how the stud would be affixed to the headlight, I suspect it may have been glued in, press fit, or melted into the plastic at the factory. Another member may be able to clarify if they happen to have a genuine set of N1 headlamps. The only thing we have to work with within the recess is a keyway which likely is there to prevent the stud from rotating within the recess. In any case, back to 3D printing, I put together a model which acts like a pug with a friction fit inside this recess, making use of the keyway so it doesn't rotate while tightening a bolt. Printing in TPU will allow it to slightly swell making a nice snug fit without cracking the part. I've designed the adaptor it to accept an 20 mm M6 bolt (stainless with a cap head in my case), as opposed to the standard M5 stud and I made use of the standard galvanised split washer that came with the genuine brackets from Nissan. Once the bolt and screws were all in place, giving the bracket a gentle shake gave the classic "shaking the car" feeling, very solid, which gives me confidence this is going to be able to hold on much better than the janky solution which seems to have been here for the past decade or so. Overall I'm really pleased with how this turned out and maybe there are more people out there running these headlights without a centre stud at all! Link to the freely available model on Printables: Click here Regards, Sean  
×
×
  • Create New...