Supercharger upgrade for 4AGE--> eaton M90

[92-GTI]

Hi peoples,

Do you think that an eaton M90 would be a good upgrade, as opposed to a sc14. I want to keep it supercharged. Has anyone used an eaton before.

Thanks

[roadsailing]

I was about to say no frigging way, but people have put SC14s and possibly SC12s on commodore V6 engines before, so it would probably work ok.

do it!

[BlackSupra]

M90 would be MASSIF!

just run with a SC14 supercharger.

M90 is designed more for a 3-4L engine

[oldcorollas]

M90 is designed for low boost on 3.8L.... say half a bar... and it's a shitty 3.8L.. so say it is actually designed for 4-4.5L.. and a low revving one at that....

so it may not be that far off.. and being twisted lobe it'll be a little more efficient..

the flow tables are available on the net, so juts have a look at them...

spend the cash and get a lysholm 1600

[thechuckster]

Wipple also make SC's that make appearances on small engien race cars.

[oldcorollas]

Wipple also make SC's that make appearances on small engien race cars.

like lysholm 1200/1600?

afaik, whipple produce under contract from lysholm... as do autorotor...
ken belle makes great ones with a different lobe count but they are for big cars...

methinks lysholm 1600 would be good for 18-20psi on a 4AG....

Sprintex in Aus has the production licence for lysholm style SC's... they are in WA? wbsite sucks tho..

[thechuckster]

yup, the sprintex website sucks.. they sell two flavours of SCs:
Sprintex Superchargers
and
Opcon Autorotor

no prices listed so i'd assume they're as dear as poison much like CAPA.

[92-GTI]

Thanks for the feed back, much appreciated.

[Mr DOHC]

heres a new centrifugal supercharger company starting up in qld here, they arent big either

http://www.raptorsc.com.au/

[Sprinterboy]

Ive been in talking with Terra Charger and they do a few good ones that may suit the GE/GZE motors. Like to see one. But i'll see how the sc14 turns out first

[Grant]

You'd be suprised how much power it takes to drive a roots supercharger. If you fit too big a SC you may find that the engine has barely enough power to drive it. Like anything on a modified engine, you must suit it to the application.

[NVD05X]

try checking out this thread from Twincam...

there is a member named "bsee" that was working on a centrifugal kit for the 4a engines...

http://www.twincam.org/forums/index....opic=13680&hl=

[oldcorollas]

You'd be suprised how much power it takes to drive a roots supercharger. If you fit too big a SC you may find that the engine has barely enough power to drive it. Like anything on a modified engine, you must suit it to the application.

it does also depend on the flow rates... the bearing resistance should be similar between an SC12 and SC14, however pumping same air at same pressure, they should consume about same power?? (perhaps SC14 a little less as it is turning X% slower?)

lysholm use around half the power of a roots.... which is like free power (well.. it's poor bang for buck but you know what i mean )

centrifugal would be interesting to see on a high revving 4...
onb 8's they work well cos they have relatively limited rpm range, or if not, they are not concerned with lowend.... and 4's tend to increase revs quicker than 8, so perhaps there could be issues there...

i'd like to see one going tho

[Earlyrolla]

The M90 displaces 1.484L per revolution compared to the SC14 at 1.4L per rev so they are very similar in size.

The M90 is more efficient with the twisted lobe design though.

This is a good sight for compressor maps (both turbo and different sorts of superchargers):
http://www.rbracing-rsr.com/turbotech.html#whipple

The M90 will be a lot cheaper option than a lysholm supercharger and an improvement over the SC12. Although the Lysholm supercharger (albeit Whipple, Autorotor etc) for a supercharged only application would be very nice

I recall reading somewhere that Terra-chargers use Eaton internals anyway.

[oldcorollas]

OMG, OT i know, but if you go to the site above, check this link too
http://www.rbracing-rsr.com/eatshit.htm

[roadsailing]

hahahahaha

[Starfire]

I would like to play with a twin screw charger on the 4AGZE. I really don't see a point to centrifugal chargers as they seem (in my opinion) to be the worst of both worlds (the lag of a turbo with the parasitic drag of a belt driven supercharger).

[benjamin]

an eaton m62 would be much better on a 4ag than a m90. There are a few m62 on ebay (worldwide though) and seem to be going for around $4-600 US.

If anyone is interested the Lysholm 1200 is available from Harrop Engineering in victoria and is $2960 inc GST - thats without any pulley extensions... Then the Autorotor which is probably the best suited supercharger for the 4ag is the 2087 model and is $3245 which is available from these guys http://www.hi-flow.com/HP6Super.htm

I have been checking all of these out and really I am just trying to justify spending that much money...

[pjaw11sc]

Im in the process of installing a whipple 1200ax sc to my aw11, just getting some injectors and then the bypass valve and vaccuum actuator and then its ready to go on...

on that note, does anybody know of any other suppliers that would have a bypass valve/vacuum actuator other than starr performance in sydney? they are apparently the only supplier of whipple products in Aus
they have them on CAPA's website too, but im not completely sure if all the bypasses are the same, I assume they would be though

[mullett]

Far as I know, the bypass valve works in essentially the same way as a BOV, so you could either adapt one to suit, or give me a drawing and I'll machine one for you. Dare I ask what one of their bypass valves is worth?

RM.