Jump to content
SAU Community

Recommended Posts

Hi all,

I've recently had my engine rebuilt using Arias forged pistons and am getting huge blow-by and a huge drop in compression pressure ( should be 120psi-140psi but I'm getting 75psi-85psi ) :cuss:

I'm told that the rings are not bedded in and I need to replace these rings and bead hone the bores to fix the problem. I'm also being told by another source that these rings are simply no good and I should get Tomei pistons and rings.

I would really like to hear from anyone who has actually used Arias forgies in their turbo nissan and what the results were like ( before I possibly go ahead and waste more money doing the rings and bore hone ).

Thanks.

Link to comment
https://www.sau.com.au/forums/topic/39070-arias-forgies-problems/
Share on other sites

I'm also being told by another source that these rings are simply no good and I should get Tomei pistons and rings.

Sounds like bullshite. Why would one brand (and an expensive one at that) be so much better than a trusted one like Arias.

The original builder screwed the job more likely.

T.

Thanks all.

Well from what I'm told, the people who built my engine are some of the best in the game so I'm now putting the problem down to the oil that was put in (as run-in oil ) by the guys who fitted the engine, or the way I ran it in ( if that's possible ).

I guess my next questions are...... How did you run in your engine ? What oil did you use to run it in ? and How many kms for ?

Thanks.

I've just rebuilt my engine with Arias and have to that I've had no problems what so ever. Engine runs better than ever. I ran it in for 1,000 kms with running in oil (very thin) then changed to like a half/half mineral/synthetic mix for another 500 then switched to my normal oil 10W-40/50 (can't recall).

To give you an idea of how much better mine is now, I can chirp third consistently with 255's on the back!

Used run in oil in mine for 500km's, did a full flush and replaced with Mobil 1 5W-50 for 500kms, did flush again, Mobil 1 5w-50 for 2500kms, did flush, and now its got Mobil 1 5W-50 in it and it goes better than ever.

When running it in I was told to put the engine under load (going up steep hills in a high gear like 3rd/4th so the engine has to work to get up it), never kept a constant speed, never idled for too long and it all seems to have worked well.

When running it in I was told to put the engine under load (going up steep hills in a high gear like 3rd/4th so the engine has to work to get up it), never kept a constant speed, never idled for too long and it all seems to have worked well.

Same advice i was given, and will stick by. Gotta give it sum stick to get those rings to expand, and bed in.

Yeah, I also never maintained one speed...ie driving down a 100km/h freeway i'd do 90, then 95, then 100, then 105 (no i wasn't speeding, it just appears that way), up to 110, back to 90, etc...

Never let it idle for too long, basically drove it without boost but did load it up in high gears but not all the time. Seems to have worked for me.

If you intend to hit the car hard for the entirety of it's life, you have to hit from day 1.

So common wisdom is that you flog it hard.

T.

could it be that the clearances set by the engine builder were a little on the large side? as in to allow massive boost etc?

Used run in oil in mine for 500km's, did a full flush and replaced with Mobil 1 5W-50 for 500kms, did flush again, Mobil 1 5w-50 for 2500kms, did flush, and now its got Mobil 1 5W-50 in it and it goes better than ever.

When running it in I was told to put the engine under load (going up steep hills in a high gear like 3rd/4th so the engine has to work to get up it), never kept a constant speed, never idled for too long and it all seems to have worked well.

Recently ran in mine using Arias ....... ran it in very similar to Amaru .... no problems what so ever .... only thing is my car sounds liek a ute when i start it up now ..... im not sure if thats normal or not

I've heard quite a few Arias fitted RB engines and they generally sound less "rattley" than say an engine rebuilt with Wiseco slugs.

I've been told that this is because they have a lower co-efficient of thermal expansion compared to other forged pistons, and therefore the clearances can be less (ie more in line with OEM pistons).

Anyone know for sure?

GAV: i dont know were you heard that from but i had wiseco's in my engine when i rebuilt it and it never rattled, nor did it rattle with the ariais in the previous engine. how ever i did get some blow by with the arias.

In regards to running in, I used motul oil and drove it slowly for the 1st 200kms then started canning it from then on. At jamboree last yr when i raced the engine was under 500kms old on the saturday.

Come 7 months/ 10 000kms later the car is still going and going strong.

i guess it just comes down to the way the engine is built

harun

yeah the engine build is very important but the way you run the engine in will determine if you have a good engine or not, doesent matter if the engine is done perfect if you do it wrong it will burn oil.

im currently getting my engine built and getting a 550hp setup together, my biggest problem is running the engine in as i have a new computer and will not be able to run the stocker as i have a 32 and fitting a rb25engine, so i need to tune and run in together, not a good thing

i used arias pistons when i rebuild my rb 26 , 87 mm , 4 thou clearance . as with all chrome rings you need a good hone . i used run in oil for 800 k then mineral oil for 4000 k then helix ultra . when running it in put it under load from the start but only for short periods like full throtle in higher gear for like 20-30 seconds then back off then on again . i have no problems with blowby whatsoever and 175 compression .

fat 32 , did they bore it out to suit the new pistons ? the clearances maybe to big or the ring gaps to big

Thanks for all the info Guys & Girls.

Here's the low-down. ProFlow at Rossmore built the engine and they're renowned for building high quality and high power engines ( mostly big HP V8's for drags ) and I have very little doubt in the quality of their workmanship ( however, after sales service leaves a little to be desired ). The bores were machined to suit 40 thou oversized Arias slugs.

The guy that installed the engine ( not ProFlow ) put Synthetic 5w40 oil in as run in oil which I didn't know about ( and don't really think is correct ). He believes that itwill make no difference at all to the run-in.

The car: From a cold start up to operating temp, the engine is as quiet as a mouse and driving the car is reasonable until you hit the loud pedal and get up on 18-20psi boost and then the oil catch can goes from empty to full in no time flat ! I ran the engine in for about 400kms before changing oil and filter but the car just seems to be going down in power every time I drive it.

From all that I've heard now ( forums, workshops, and owners ), it would appear that Arias pistons and rings are great so long as boost is kept below 18psi ( due to ring design ) and if you want to run bigger boost than that you're best to get Tomei or Jun pistons. This is only a conclusion that I've made from talking to around 40 or so people re this subject.

Since I'm essentially broke at the moment I'm thinking of doing what Chris32 ( and others )suggested and chuck some mineral based run-in oil in, turn down the boost to about 14psi max and thrash the nuts out of it to see if the ring might bed in. If this doesn't work I'll just park the car and start stripping it :D

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

    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
    • You haven't driven many modern cars then have you? Most of them have sfa steering feel with their stupid electric bullshit steering systems.
×
×
  • Create New...