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Whipple and Opcon/Autorotor both recommend 15/50 or 20/50 synthetic motor oil for the gearboxes in the twin screw compressors.

I am going to go along with the bridging comment, but not limit it to bridging of the bag. I have seen many many parts come out with voids in inside corners due to bridging of the PEEL PLY on the part as it compacts into the mold under vacuum. The vacuum bag will typically stretch a bit, but...

It does appear to be obvious that the design of the bypass setup will be critical. I also agree that a throttle in front of the blower and then an air-air intercooler setup (with the requisite cooler and piping volume) would never work without keeping the ITBs in place and functional. I don't...

Again, the issue arises, since the fundamental position and the orientation of the compressor will be different (or at least in my mind, I would intend it to be different) depending on the approach. If I do an air-water setup, the charge cooler is located internally in the intake plenum, and...

Warpspeed, The problem with your "approach" of get it running and then deal with it, is depending on the severity of the "problem", and dealing with the problem, may completely dictate how I ultimately decide to lay out the system! If I can get the blow-thru setup to work, and work well and...

When I say compressor inlet, I am still talking screw compressor, not turbo or centrifugal. Since the Lysholm unit is a true compressor, I didn';t consider that an issue! It is looking like I should plan to include the auxiliary draw thru throttle, since it is likely that I will find...

On my current setup, there is a path around the throttle from the compressor inlet housing to right after the MAF and air filter, for idle air bypass. Granted that is a smallish 1" diameter rubber hose, but it doesn't seem to transmit any noise. Let me get this straight though, if I read what...

In no case will my system be put together with an open air bypass. The bypass will be a true bypass, and plumbed back in. If I do a blow-thru setup, I will have an open-air pop-off or blow-off valve, as a fail safe, and also it will likely activate during brief throttle closures such as...

Interesting ideas. I think adding a cable to the throttle would be problematic, but I am not certain. The DBW throttle assembly is quite complex, and quite expensive on the BMW, and quite likely also quite quirky! I think I would be better off slaving either an electronic throttle off the...

Warpspeed, My system has a drive-by-wire throttle setup where there is an existing throttle control motor, with a linkage to the ITBs. I could possibly slave off this linkage somehow to open an aux throttle, however I am not certain that the existing drive system has adequate "horsepower" to...

The draw thru system i did previously is actually barely noticable at idle and normal highway cruise, etc. It is only moderately loud at WOT, and not unpleasant at all. Not sure what I will be willing to live with on this setup. Interesting the link you posted. However that is a very very...

Why don't you just do what Ford does, and use the refrigerant to cool an intermediary medium (liquid or gel) that is much less of a threat, and then circulate that thru the liquid side of the core? My understanding of systems like this is that if you wanted to use the AC to take the full heat...

Greg, I am not certain I understand what you are suggesting. I am using a Lysholm 2300AX compressor. I am still a bit unsure whether I plan to use an air-air intercooler with the associated piping, or whether I will integrate an air-water core into the manifold plenum similar to my previous...

Pat, with all due respect, you need to thicken your skin a bit and relax. Also, saying this is a stupid idea is rather closed minded, and short sighted for an engineer. Do a bit of research. As I said, it can, and has been done, by automotive experts, engineers, and manufacturers who most...

On the previous setup I designed for the S52 engine (no individual throttle bodies), I had the compressor mounted directly on the plenum (cast aluminum), and a water-air charge cooler core mounted inside the plenum with some volume after the cores. Compressor noise in that setup is barely...

While screw compressors may not have the same "pulsing" as a roots, the internal compression in the unit (pressure ratio built-in of approx 1.4) results in a case where air is being compressed, and the "re-expands" when the bypass valve is open. This expansion results in a "popping" sound as it...

During cruise with a draw thru system, the partially closed throttle plate must block a lot of the inlet noise of the compressor. Couple that with the fact that the compressor is not doing much "work" due to low density of the inlet air, and the result is that you barely hear the compressor at...

Application is BMW inline 6 cylinder. Will use a ribbed belt for drive, as i have in past setups with non ITB engines of the same type. The intake tract can be relatively long, and I can use non-metallics in it as well, probably in the inlet housing to the compressor as well, to help provide...

Secondary bypass/blowoff or pop-off valve can be used in case the primary bypass sticks. I don't care how loud it is when I close the throttle at high rpm. I care how loud it is under normal cruise conditions. I think i recall in past threads where your feelings against doing this is quite...

+ Large Bypass = no problem. Its been done, hundreds of times, and even on a few "production" cars or aftermarket SC kits. Do you have any answers for my question?