This is the statement I made on the vendor review thread copied here:
To clarify, AMS did not work on this car, do the install, or the do tuning on it. We only built the engine(s) and shipped them out.
I want to state the FACTS here because it seems emotions are getting the better of people and there are assumptions being made. As of most recently we offered to pick the customers car up for free, look into the latest issue (not knowing who or what is at fault) and fix it for free, and deliver it back for free but the customer declined this.
To reiterate, we have built the engines but we have not installed nor tuned any of these engines. Here is a summary of events so everyone is aware.
Basic 3.8L build
Customer sent in a long block for a core. Installed in 2014 and ran well for 2.5-3 years on an alpha 9 and had only 4000-5000 miles on it according to the customer. If you follow the thread there was plenty of racing done on this engine (1/4 mile, 60-130) on E85. When it was sent in the main bearings were hammered. If this engine was built incorrectly and bearing clearances out of spec it wouldn't have lasted 30 miles under load. For main bearings to go there needs to be something drastically wrong either bearing clearance, main bore concentricity, rank flex, loss of oil pressure or oil, contaminated oil, or excessive torque. Incorrect clearance or concentricity from error on our part would show up very quickly, almost immediately. Again AMS did not install or tune this engine!
4.1L with a Sonny Bryant billet crankshaft
The block and main bores were still withing specification so the same block was used on this build. This engine was installed in early 2017, tuned (again neither by AMS) and allegedly ran for 1000 miles before it also did the same thing engine #1 did. We didn't know until after the failure but the customer upgraded to a Garrett GTX3582 turbo kit (built by his shop) on this second engine. When we asked for data logs from any runs we were told there were none.
At this time the customer is upset, and I can sympathize, but we can't assume where the fault lies. The customer is also upset when I tell him he has small Tomei camshafts upon inspection, he ask why didn't we sell him bigger camshafts on the engine because he was running bigger turbos. The customer originally had us quote an Alpha 12 to go with his 2nd engine built but then decided against it because he said he was concerned with the lag. Unbeknownst to us, he got a different turbo kit for the car, so we had no reason to recommend larger camshafts.
Again this failure which was the exact same as the first failure, main bearing wiped out. We didn't install this engine nor did we tune it, neither were there datalogs for us to look at. The engine was just sent to us. We were never told this engine was burning oil like the customer is stating now in his posts. He also mentioned to me a phone call last week, that maybe that's why his engine ran out of oil because it was burning so much of it.. hmmm?
Were all the oil lines, turbo's and turbo lines, etc cleaned from metal debris on the first engine? Oil cooler?. We have no idea because we didn't do the work. We have a log book and build sheet for every engine we do, with measured bearing clearances, bore sizes, piston sizes, ring gaps, leakdowns, etc.
At this point I suggest going with a 4.0L non stroker to be easier on the main girdle, just in case something is going on there or he's running a lot of torque on this engine.
I also offer to swap out the mild Tomei camshafts for our Alpha camshafts for FREE. These are much better suited for the larger turbo he's running (that we weren't made aware of before). I also do a billet steel main girdle cap system that we were working on with our machine shop for FREE. That cost to me is almost $4K for the conversion and machine work alone. AMS also give the customer a FREE brand new block from Nissan. The previous block (that the customer originally supplied as a core) went through twice with main bearing being wiped out and we didn't want to risk anything in case it was flexing. We did the labor on this entire engine for FREE. Even after all the free parts & labor we then split the remaining cost (not retail price) in half with the customer. He basically received an all new 4.0L dry sleeve SB billet crank long block (with new OEM block), custom billet steel main cap system, oil pump, pistons, bearings, with new cams, and service work done on the heads for a little more than $6000.00
This most recent engine was installed by the customers shop and being broken in. After 250 miles I was told it consumed 1 quart of oil and there is some oil seeping from somewhere in the engine (not leaking on the ground but oil moisture near some covers/ream main). A borescope was put down a cylinder and there is lots of oil pooled up on top of the piston. The shop he has it at pulled off the intake manifold and I was told there is a lot of oil in the manifold and runners but nothing pre-throttle body.
At this point not knowing what is wrong I offer to pick the car up for free, fix whatever is wrong for free (not even knowing if this is our fault or not), finish break in and tune for free, and deliver it for free. The customer refuses and claims he will take it to a different place to build the engine.
I'm not sure how much more fair and reasonable I could have been. We didn't install or tune any of these engines, that is all out of our control. The first engine lasted 2.5-3 years and then lost bearings. Engines don't do that if they aren't built correctly due to clearances, they fail almost immediately. This last engine I offered everything on our dime including shipping of the vehicle without even seeing what could be wrong, it was still not good enough. I then offered his money back if we would get back to our shop (again on our dime) diagnose what was wrong, and if it was our fault I would issue a refund on this last engine. The customer also refused that.
Yes we can make mistakes, and when we do we absolutely cover it. I have customer that can attest to that. We also have a lot of fast race cars and street cars that we built completely or just built engine for that are out there and last! There is more to it than just building an engine. The tuning, the care, and how the engine is used all affect the longevity.
edited for clarification up top.
Edited by Martin@amsperformance, 23 April 2019 - 05:53 PM.