Ive just payed a visit to my shop and the owner had a chat with Davie(sp?) at AEBS. He said AEBS recieved a customer's car with a TT running stock boost on the stock motor and one of the sleeves had a hairline fracture. He also said the customer did not feel any difference in how the car ran. Davie also said the stock sleeves can only handle 425 crank hp safely. This worries me to say the least with so many of us about to build up our motors. Ive read/heard from almost a dozen sources saying our stock sleeves can handle in the neighborhood of 700 rwhp. SGP has already demonstrated that the stock sleeves will take over 600 rwhp and Smithtown has done a number of passes running over 1000rwhp. On top of that, Boulder Nissan and a few private owners have also produced significant amounts of power with forged rods and pistons on stock sleeves. I can only assume that our stock sleeves are also prone to inconsistencies like our rods but perhaps its less evident. Can someone with more background in material science or metallury please explain what can be expected of our stock sleeves? I'll close on a good note, Davie said our stock cranks really are good for 1000 rwhp.

 

I had not yet heard that about the sleeves but I did hear that the rods are only reliable to about 465. However I did hear the tranny is good to like close to 1000 and the rear end is good to 650/.

 

maybe they say that so you can go to their company to spend some good chunk of money on their sleeves..

i would like some more info also.

 

The crank will handle alot more than 1000whp and IMOP if you want 2000whp get the AEBS stuff.

 

i strongly disagree with AEBS's assessment. Every time you call them, you get a different answer on this. Also, it is the opinion of Z1 and SGP, both of which can stand to make money with sleeve installs, that thye are not necessary unless you are going over 800-900 hp.

Also, there is a huge (IMO) risk in putting in sleeves. If they are not put on correctly, there is a considerable chance of them sinking. One thing that AEBS will not tell you is that recently, 2 out of 5 engines that they did had one or more of their sleevs sink. Not a good success ratio. (A well-known shop in L.A. that we have all heard about was, first-hand, prevy to this information).

 

you've obviously never seen one in person then. if you see how the sleeves sit in the block, you'd know that they don't sink. they have an interference fit on the top and bottom, they can't sink unless you crack the block itself. why not post pics of the sunken aebs sleeves you speak of?

 

damn your first post and your going bonkers.

 

http://www.b15sentra.net/forums/show...highlight=AEBS

 

Thanx for the link MIAPLAYA. You cant rush perfection and seeing that AEBS is always swampped, they might have outsourced some of their work. Maybe its best to jsut keep things simple and stick with stock sleeves. Im going to ask the machinist to inspect the sleeves if he could.

 

I'm not saying AEBS is GOING to mess things up but from that story its pretty bad...

 

A point. This link is not ot AEBS sleeves in a VQ35 block. THe VQ35 sleeves are designed differnetly and do have a machined lip at mid sleeve. Sinking in a VQ35 would be a mechanical impossiblity from what I'v seen. If you have a pic of a sunken AEBS sleeve ina VQ35 , I'd like ot see a pic.

PS . I'm not advocating AEBS sleeves and my current longblock is being built on the stockers (target ~800 crank).

 

According to that thread which btw is from a pretty reputable tuner the SR block had the same issue. I have not been inside an SR block in God knows how long but I believe it has the same mid sleeve lip. If so then its still not looking good.

 

I retract my previous statement it does not have a mid sleeve lip. Just talked to a buddy who confirmed it for me.

 

Okay, first off, to get your information from a company who would stand to make money off of the assumption you would believe what they say is not what I would consider reliable information.

AEBS just wants you to think that the sleeves are necessary for high HP applications.

Also, as stated above, there have been numerous engines out there with high HP ratings that are still running without any problems but are something that AEBS would consider an "unsafe" engine.

I have thought about this for a long time, the necessity of getting sleeves. But the question remains where is the cut-off point? Personally I would think that the stock sleeves are good for 700-800 crank HP, outside of that, then yes, you are risking your engine.

I would like to get sleeves for my goal of a high HP engine but after getting a quote from AEBS for $2,275 for just the sleeves(shipping and/or install costs not included). I am kinda wondering if there is a better place to buy them from. I know that Darton makes a set but I have also heard that their sleeves are not reliable.

Anyone else know who makes sleeves that we can use? Maybe we can setup a GB depending on what information we can find.

 

I was qouted 2275 installed. The sleeves are 1800 for the set.

One of the techs at my shop just told me the stock sleeves are made of 2 layers. The inner half of the sleeve is cast iron but the outer half is aluminum and that is how it bonds to the block so easily, hence easier to mass produce. I could of tell from looking earlier because the 2 layers are so well formed together. I had just thought it was some stains left over from the head gaskets.

ftp://the-citadel.us/upload$/enron/IMG_0001.jpg

 

I guess the question now is do they make sleeves that are the same size as the stock bore? Considering that I already have my pistons, I am now starting to consider this option.

VQ stock Bore: 95.5 mm

The only bore I have seen with AEBS is 100.0mm and 101.5mm.

 

Yes the sleeves come with a bore of even smaller than 95.5mm for the machine shop to bore out to the diameter of your new pistons. 100mm is the max bore recommended for boosted applications and 101.5mm for non-boosted applications. They are probably around 93mm out of the box.

 

since it doesnt appear anyone else on the forums is running the AEBS sleeves... i guess i will be the test rat? unless someone beats me to it... if all goes well within 14 days I should be cranking her over.

 

Sounds good to me!

 

I just might jump on that boat with you.

It turns out after calling bluefish, aka Dan, at Smithtown this morning, i interpreted his post wrong. The motor they ran at NOPI, when they did the 8 second pass, was on a fully built motor with aftermarket sleeves. The stock sleeves will handle at the highest 800 rwhp but 600rwhp should be safe for everyday use. Sorry about the confusion.