supercharger recoat

[TERRA Operative]

This is what I have found re. the SC chargers.

The lobes are made from extruded aluminium in the shape required. The outside surface is grit blasted and cut to size then it appears the lobes are re-extruded through a slightly larger mould that applies the teflon (or similar) coating. (sort of like icing a cake all the way around at once).
Spraying a new coating on is not really an option because of the tolerances involved (which run to as close as 0.25mm) and the thickness needs to be about 0.5mm or so, much thicker than most spray coatings. Also the teflon profile doesn't follow the aluminium profile exactly so even if you sprayed the right thickness perfectly, it wouldn't be the proper shape.

Ie, you can't recoat these things.

What about buying new ones? Well Ogura will sell them (with their universal mounting points, not the Toyota style) but you need to order a pallet of chargers as a minimum............


As for bearings, you CANNOT get the front bearings at all, unless you commission Koyo or KYB to manufacture a production run of around 1000 bearings of each type.

You can get the rear bearings, or could, until I bought 2 of the last three in Australia for my rebuild, and have the last being held at the local bearing place pending my discovery of a last one overseas.
If anyone finds a source of rear bearings, let me know, the manufacturer has no plans to do another run in the foreseeable future.

The two rear seals are still readily available, but to replace them (you know they need replacing if your supercharger uses oil) you need to heat the rear bearings to melt the epoxy that holds them in to remove the bearings to access the seals.
Unless you have precise control of the temperature, you risk stuffing the bearings so you really need to replace them anyway.


So, basically, if your supercharger needs front bearings or new lobes, get a new supercharger. If it needs new oil seals or rear bearings, if you can find the rear bearings, then you can extend it's life.


Also, to prolong the superchargers life, keep the supercharger speed below 10,000RPM and the boost below a ratio of 1.8, or 2.0 short term (or 12PSI, and 14.7PSI short term)




*OR* go stick an Eaton M90 or some other screw type blower on. (you turbo fags can go f**k yourselves. )

[_gear2]

terra is it an ogura tx12 that come with the Supercharger kit for 2ZZ GE? and all the parts are internally the same as the sc12?

[TERRA Operative]

Here is what I've found re. the 2ZZ-FE:

- The Lotus uses an Eaton M62 blower
- The Blitz kit uses a TX12 (The Ogura part number for the SC12) http://www.blitz.co.jp/products/comp...ressor-kit.htm (looks like the stock Ogura blower, could be a good source of new 4A blowers..... I just wish it was a TX14, or 20.)
- The Greddy kit uses a MP62 Magnuson http://www.magnusonproducts.com/mp62.htm
- The stock Toyota supercharger is an Ogura unit, probably a TX12 (or thereabouts) I would say it is very similar to the Blitz kit, but OEM in it's integration of course. http://img850.imageshack.us/img850/9863/021s.jpg


I haven't looked into these engines much, but it does open up a few more avenues for the ageing 4AGZE...

[oldcorollas]

is the magnusson just a 4th gen M62?

and when are they gonna make smaller aftermarket TVS jobbies?
or will an R1320 be small enough? hmm

[Duk]

and when are they gonna make smaller aftermarket TVS jobbies? or will an R1320 be small enough? hmm

The efficiency between 11000 - 13000 RPM and 2.2 PR is very nice, but trying to take advantage of the SC's peak efficiency on a 1.6 litre engine isn't really going to happen.

The smaller R900 geared to about 2:1 should make excellent use of the SC's peak efficiency and deliver a higher pressure ratio.

[Redmohawk]

With the right tools a rebuild is still an option. After all in years gone by most roots chargers started out as exhaust scavange pumps on dirty old diesel motors.

Get the lobes machined , T slots or V slots (thin end to outer edge) to retain teflon seals. Bearings are replacable if the correct unit isn't avalable then up size and machine housing or downsize and fit collars etc.

[oldcorollas]

yeah, that's IF they ever produce them (the small TVS that is)

[TERRA Operative]

Yea, I've looked into different bearings, the trouble is finding a fully sealed cylindrical roller bearing that is rated to 10,000RPM....
I have an old SC12 or 14 shell that I'll have to measure up and stick into Rhino 3D to CAD up some different ideas.

The trouble is when you work out it's not worth it and easier just to go to an Eaton.

[Duk]

Yea, I've looked into different bearings, the trouble is finding a fully sealed cylindrical roller bearing that is rated to 10,000RPM....
I have an old SC12 or 14 shell that I'll have to measure up and stick into Rhino 3D to CAD up some different ideas.

The trouble is when you work out it's not worth it and easier just to go to an Eaton.

That is exactly it. They are an old design that was superseded years ago, why go through the grief of trying to fix an old SC when for less hassle and probably similar dollars you could have a much better, newer design supercharger.

[Redmohawk]

Its only not worth it if you have to pay someone else to do the work, the cost of a suitable replacement bearing and some teflon is well under $100 i would bet.

Paying for some machining wouldnt be of great cost, a mill is about all you need. The right bloke might do it for a slab, once done is repeatable. If your more hands on a cheap chinese mill can be had for under $300 that will do the job in a pinch. I picked up a 6 inch lathe with mill attachment for under $800 ex china pickup Melb love ebay at times lol

[Redmohawk]

woops double post

[Q-Authority]

If the rotors can't be recoated to the proper depth themselves, how about coating both the rotors and interior of the SC housing, or is there a practical reason for not doing so.

Early SC's, such as Blitz had no coating on their rotors, and they were actually shaped very much like the rotors on the Ogura TX models of today, not the smooth figure-8 shape that the SC-12's used. Not sure if they coated the housing or not. I had a rare AW11 Blitz SC kit that had bare rotors (and yes, it was new old stock, not just worn, lol).

[LeeRoy]

With the bearings can't you machine up a press fit sleeve or machine down an off the shelf bearing to make one fit?

[TERRA Operative]

Yea, it's just a matter of finding a sealed cylindrical roller bearing to fit the area you have to play with.

The problem is, cylindrical roller bearings are hard to find as a fully sealed unit. You can't use ball bearings as the cylindrical roller bearings are used to allow the shafts to expand and contract with heat. Ball bearings will just thrash out with the side loading.

You *can* get cylindrical roller bearings that are sealed, but the trick is to find one rated to 10,000RPM that is big enough.