L-Series Cartech Turbo

[MicroMachinery]

I recently was shown a Rajay Turbocharger that is included with an L20b Cartech turbo kit. I'm trying to find out some info on the turbocharger itself before i proceed with it. Here's the tag on the turbo; I'd like to figure out as much info as I can about what model this is. Thank you!

 

 

I've tried Google, and not come up with much. I'll keep looking as I await the flood of educated responses ;)

[bonvo]

watching this closely 

[Skib]

Roto-Master Inc hasnt been around since the mid 90s or so.

RayJay is still around but they only do aircraft turbos.

 

 

heres the patents for it

https://www.google.com/patents/US3010697

 

https://www.google.com/patents/US3043636

[Laecaon]

FF25 = F-flow compressor wheel, F-flow Turbine wheel, .25AR

 

 

Basically, there is B, F, and E wheels, for both the compressor and turbine, and those are in order from smallest to largest...Where the E is good for small block v8's. I think the F is supposed to be efficient..ala 60% up to about 300 or so HP. the E up to 550 or something...

[MicroMachinery]

Thanks guys. Anything helps :)

[MicroMachinery]

Pics help. Here we go..

 

 

 

 

 

 

 

 

 

 

Old school.

[DISLEXICDIME]

Oops never mind

[MicroMachinery]

You can't do that.

[DISLEXICDIME]

Is that delta gate a pop off valve or a waste Gate?

[MicroMachinery]

Waste gate.

[MicroMachinery]

Found this.. just putting it here for future use:

 

Model Number Key for Rajay Turbochargers takin from Rajay/Roto Master maintance manual.

    Example (3AA1BB60B1) or (3-A-A-1-B-B-60-B-1)

                                          1-2-3-4-5-6-78-9-10

1. Turbo Family - Indicates compressor wheel diameter. For all, this will be a three.

2. Compressor Housing Design Options - Indicates compressor housing features.

    A.= Hose connection (3.00 inch)

    B.= Threaded inlet - long

    C.= Threaded inlet - short

3. Turbine Housing Design Options - Indicates turbine housing features.

    A.= Rectangular inlet flange

    B.= Triangular inlet flange (long outlet)

    C.= Triangular outlet flange (short outlet)

    J.= Rectangular inlet flange (extended outlet)

4.  Bearing Housing Design Options - Indicates bearing housing features.

    1.= Die cast, single feed (300 series)

    2.= Sand cast, single feed (375 series)

    3.= Sand cast, single feed (370 series)

    5.= Sand cast, dual feed (375 series) (1)

    6.= Sand cast, dual feed (370 series) (1)

    7.= Die cast, dual feed (300 series) (1)

5. Compressor Flow Options - Specifies B,F or E flow compressors.

6. Turbine Flow Options - Specifies B,F or E flow turbines.

7-8. Turbine Housing A/R Ratio Options - Specifies turbine housing A/R ratio.

9. Internal Design Options - Indicates certain internal design features.

    A.= Dual feed bearing (1)

    B.= Single feed bearing (2)

    C.= Single feed bearing without compressor flow fence. (E flow only) (3)

    G.= Dual feed bearing without compressor flow fence. (E flow only) (3)

10. Heat Shield Design Options - Indicates type of heat shield.

    1.= Stamped (2)

    2.= Cast (4)

[MicroMachinery]

Here's a map for what I'm assuming is the turbo I'm looking at:

 

 

If my math is correct, at 7psi, the figures for an L18 @ 5000rpm should be as follows:

 

1.48:1 Pressure ratio

125cfm(rounded; N/A L18)

1.28 Density ratio

160 CFM @ 1.28 Density(5000rpm).

 

Supposing all the above is true, that puts me in the 70% efficiency island of the map, with the turbo spooling right around 60k @ 5000rpm. Looks pretty decent. B)

[Skib]

good finds.

[MicroMachinery]

Did a little figgerin'. Here's where I'd be sitting at 5k, showing for 4psi, 5psi, 6psi, and 7psi.

 

 

6psi and 7psi seem to look like the most efficient at 5k.

[MicroMachinery]

Here's a look at 3k.. 

 

 

At this RPM, it looks as though 4psi and 5psi are the only numbers to the right of the surge line.. 

[Luke-16]

Here's a look at 3k.. 

 

 

At this RPM, it looks as though 4psi and 5psi are the only numbers to the right of the surge line.. 

Wow,thats math,which i quite afraid of :geek: .By the ways beside of this old branded turbo for L engine,does it still available on newer turbo one?

[hvyd]

How much for that turbo kit

[datsunfreak]

Is that delta gate a pop off valve or a waste Gate?

 

FYI, this is made to be a "draw through" carbureted set-up. No blow off valves allowed on those.  ;)

[shacks510]

FYI, this is made to be a "draw through" carbureted set-up. No blow off valves allowed on those.  ;)

Then what's the point if I can't hear the SHHHHHTHHTHHTHHTHTHHH when I let off the gas? That's a third of the reason of having a turbo.

[DISLEXICDIME]

Because compressor surge sounds cool to

[MicroMachinery]

 

Because compressor surge sounds cool to

 

Yeah, super cool. Unfortunately, however, surge isn't an issue with draw through setups.  ^_^