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Rajay turbo question

  1. #1
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    Default Rajay turbo question

    Is there a source that can explain how the various Rajay turbo numbers compare and what each set of numbers mean?
    Specifically, how do the Rajay 301 E 10 and the 370 E 70 compare to each other?

    I was told they are essentially the same. Yes, or no?

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    Senior Member 66sanger's Avatar
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    Default bump

    Bump for info!

    I have an old Banks twin turbo setup with Rayjays - and something mauled one of the compressors. I need to figure out what I have and what my options are...
    Eric Armstrong

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    This may help some.

    Copied part of a thread at

    twin turbo SBC? some q's [Archive] - NastyZ28.com



    The break down on that model no. or for any Rajay if you find one identifies the inlet wheel as an E trim, the exhaust is an E trim and the A/R is a .90. The number has all of that info built into it. The part of the number that states EE90 is how they spec the turbo.In some of the rajay numbers they state both trim I.D.'s like mine stating EE, and sometimes when they just provide one letter designation it means that both wheels are the same trim. You should be able to find the A/R number just inside the inlet of the exhaust housing if the tag is gone or you think the housing was changed. This would be just inside the of the housing at the rectangular flange which is the inlet of the exhaust housing.The rajay turbos are really simple to deal with because they only come in a few variations. There are three wheel sizes for the compressor and turbine, they are from the smallest to
    the largest, B, F, and E. Rajay made turbos generally using the same wheels on both sizes, so you usually find turbos with EE, FF, or BB trims, but sometimes in special performance applications you will find the compressor wheels one size larger than the exhaust. An example of this would be an EF trim, where the compressor is an E trim and the exhaust is an F trim. I have seen FB, and EF as the variations. You never will see a factory EB trim setup.
    Another item to understand is that rajay built two styles of turbo, a 301 and 375 style. One has a single oil inlet and outlet while the other has a single inlet with three outlets placed radially around the bearing housing. This style was used in aircraft applications and was designed in this way to allow oil to drain even when the turbo is in odd positions like what would take place in an airplane. You can find any of the wheel trims in both style turbos...
    In regard to housings, there are two styles, one for automotive applications and another for the aircraft applications. The aircraft housings have no bolt together flanges, they use a V-band style attachment and do not work well in automotive stuff but can be used.
    So there's the long version of Rajay ID. and there were thousand made and if you want parts or a new one Turbonetics now makes them.Airesearch will be about the same as any Garrett since they became Garrett later on.

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    Default thanks!

    Charlie,

    Thanks for the info! That was exactly the education I needed! I will look the turbo over and figure out what I have, and figure out where to go from there. Likely replacement for one, rebuild the other.
    Eric Armstrong

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    Thanks for the above information. It does help in understanding the Rajay terminology.
    I looked at the Turbonetics web site and don't see the Rajay listed as one of their turbos now and
    my understanding is they are no longer available.

    The reason for my original post was that when I took the Rajay's off of my engine, I found two different models being used.
    They have been run that way for a length of time and are doing fine, but I would like to have matching model numbers if possible, so
    if anyone has one I would be interested.

    I have talked to several turbo shops and they can supply me with new turbos by different manufactures, but I have the Race Areo set-up
    and would like to stay with what I have.

    Jim
    817-457-4237

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    Quote Originally Posted by jimsplace View Post
    Thanks for the above information. It does help in understanding the Rajay terminology.
    I looked at the Turbonetics web site and don't see the Rajay listed as one of their turbos now and
    my understanding is they are no longer available.

    The reason for my original post was that when I took the Rajay's off of my engine, I found two different models being used.
    They have been run that way for a length of time and are doing fine, but I would like to have matching model numbers if possible, so
    if anyone has one I would be interested.

    I have talked to several turbo shops and they can supply me with new turbos by different manufactures, but I have the Race Areo set-up
    and would like to stay with what I have.

    Jim
    817-457-4237
    I had Rayjays on my motor also with a race aero system, and had nothing but problems with them even after they were rebuilt by turbo city in Anaheim. I bought 2 new Turbonetics 60-1 HiFi turbos and couldn't be happier. The price of the new turbos was barely higher than what I paid to have the Rayjays rebuilt.

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    Are the turbonetics draw thru and did the original water cooling housing work with them?
    Do they have about the same output as the Rajay's?

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    Quote Originally Posted by jimsplace View Post
    Are the turbonetics draw thru and did the original water cooling housing work with them?
    Do they have about the same output as the Rajay's?
    Yes they are draw thru. I'm using the gentry water cooled housings not the water cooled shields, but those should work also. Same output as the Rayjays if not more! Rayjays are as good as junk as far as I'm concerned especially if you can't get parts for them!

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    Senior Member 66sanger's Avatar
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    Default here's something interesting

    Quote Originally Posted by jimsplace View Post
    Is there a source that can explain how the various Rajay turbo numbers compare and what each set of numbers mean?
    Specifically, how do the Rajay 301 E 10 and the 370 E 70 compare to each other?
    I was told they are essentially the same. Yes, or no?
    Jim,

    I had recently bought a book to get smarter on the subject, and I was reading it last night. This whole thread got me interested in getting the parts I need together to put that turbo motor together. Turbochargers by Hugh MacInnes was written in 1984 and had turbo maps for both of your turbos...Really great old read. Lots of turbocharger theory, and how to do it without fuel injection and computer control. So far I have been reading non-stop.

    301 and 370 Turbo Compressor Maps. The dashed black line curving up the middle of the first one is a 250 inch engine on the map. The second image compares a 300 "F" trim turbo with a car motor (note how the demand tapers off at the top) vs. a 370 "E" trim in a marine application (the demand does not taper due to engine load). Importantly though, the compressor maps are identical at all flows and pressure ratios!
    Click image for larger version. 

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    Click image for larger version. 

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    The compressor maps are identical (301 vs. 370)! The "E" trim seems to dictate this. The 300 vs. 370 is apparently the oiling differences, as noted in the post above. The book also shows a 370 E in an aircraft (Lycoming O-360) and the map is identical again.

    Your different A/R's shouldn't matter because you have not-Rajay turbine housings, so as long as the inlet size is the same on both, then they are identical.

    I also found this link on PB to a previous thread. It's a year old, but has good info on rebuilding/replacing. Calling some of these other suppliers and verifying this info with them may answer your question, as well as save you some money and effort! (and me too!)

    http://www.performanceboats.com/dyno...jay-setup.html

    Let me know what else you find out!
    Last edited by 66sanger; 01-30-2013 at 03:55 AM. Reason: PDF's didn't work...here's JPEGs...
    Eric Armstrong

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    Default A/R explained

    Jim,

    I still don't know how to pm pictures so I'm posting this here to explain A/Rs.

    Here's an image from Hugh McInnes book - what it shows is that A is nozzle inlet area, and R is the distance from the turbine center to the nozzle center, in other words, it is the area which the exhaust acts on the turbine.

    A larger A/R means more area. For a given (constant) RPM, backpressure remains constant (determined by the exhaust system downstream of the turbo) and volume of air will be constant, that area will determine flow velocity.

    Small A/Rs give higher velocity, thus higher turbine and impeller speeds at the same RPM as a larger A/R. This means that a small A/R turbo will reach its maximum output at a lower RPM.

    Why it doesn't matter to you...

    1. - Not all manufacturers used A/Rs to define their turbine housings

    2. - Banks and others used proprietary turbine housings with water jacket I g and identical A/Rs, only compressor and turbine blades from Rajay or whoever! Yours should match no problem.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Eric Armstrong

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