Rotrex Supercharger

Post Wed Nov 21, 2007 7:19 pm

buster wrote:Isnt the A/C pump in the same place also ?

The air pump hangs below the A/C compressor. They both run off the same belt.

Post Wed Nov 21, 2007 7:37 pm

Onz wrote:nice comments mate, i wasnt sure about the different types of blower before. I am familiar with the G60 blowers from Vw and the Eatons. What type is the G60 just oout of interest? And do you know which type they used on aeroplane engines. I read a really interesting article about the lancia supercharged and turbo charged engine recently. I think they used a centrifugal blower on that but i am not sure.

As far i can remember the G60 type is a vian type like a looking end on to a spirel, like the have in the centre of a jet engine so you can tell its still turning

The spitfire used a twin centrifugal supercharger like two conventional turbo turbines one infront of the other on the same shaft

http://www.aviation-history.com/engines/merlin.htm

Post Thu Nov 22, 2007 11:44 am

Mmmmmm twin superchargers, makes me think about

I am also thinking about a supercharger but I really wanted smooth and even power delivery to make the engine feel like a higher capacity unit. Which type would provide that?

Post Thu Nov 22, 2007 11:54 am

Onz wrote:Mmmmmm twin superchargers, makes me think about

I am also thinking about a supercharger but I really wanted smooth and even power delivery to make the engine feel like a higher capacity unit. Which type would provide that?

If you want a boost in low down torque and a smooth power then the "twin screw" type blower would be better as it is much more efficent than a eaton (roots) type blower but then is also alot more expensive due to the machining process, thats why so many manufactures use the eaton unit as there cheeper and theres been more development done with them.

Post Thu Nov 22, 2007 12:17 pm

lol, thats bud, isnt it a shame that I always like the expensive option! If I go for one of these kits from Ant can we change the blower to a twin screw one later?

Post Thu Nov 22, 2007 12:39 pm

That would be very hard as the twin screw is alot bigger in length.

Post Thu Nov 22, 2007 12:48 pm

and what for as they are not as efficient..you could always ask ant to fit rotrex's biggest size the sp 30-104 if you think your engine could stand the pressure

Post Thu Nov 22, 2007 2:11 pm

not really fit for purpose, what I really wanted was a smooth power increase all through the rev range, I think ill have to go back to the drawing board and re-think the strategy.

Post Thu Nov 22, 2007 5:20 pm

Onz wrote:not really fit for purpose, what I really wanted was a smooth power increase all through the rev range, I think ill have to go back to the drawing board and re-think the strategy.

read corky bell and you will find that is just what a supercharger does....maybe if you slot a v8 in it might do what you want

Post Thu Nov 22, 2007 5:30 pm

MMMMMMMM V8 dual chargers

Post Thu Nov 22, 2007 5:36 pm

My charger has realy made my car pull smooth all the way through it doesnt rely have a sweet spot it just pulls all the way through, loads more power low down and mid range but still pulling stronger up top to

.

Andy everett drove it the other day and said it pulled more like a 3.5 N/A low down. Not bad for a 1.8!!!

Post Thu Nov 22, 2007 5:43 pm

So do you need to be a spanner wielding God to fit one of these or can your average bodge merchant cobble it together?

Post Thu Nov 22, 2007 8:02 pm

2 hours tops to fit the hardware, hence aimed @ the DIYers

Post Thu Nov 22, 2007 8:07 pm

Nice one Ant! I've done a few conversions using the Rotrex Supercharger and they are the dogs nuts. They really make the engine feel like a much larger capacity engine. I have seen a couple without intercoolers.... these are needed as the intake temps can soar!

I have not done a BMW yet and as I have been thinking about Turboing the Touring I have, maybe now I will buy a kit from you Ant without the charger, as I have a large capacity Rotrex unit brand new sat in the box

Will be in touch soon,

Post Fri Nov 23, 2007 3:45 pm

hmmm...so ure saying that the spool up time isnt really that long then?

Post Fri Nov 23, 2007 6:22 pm

Boost rises with engine speed, unless you have a blow off valve set to a certain pressure ofcoarse. But boost does not drop off like it can with a turbo. Also no major surge in power like a turbo from low RPM either, so better on the engine IMO.

Ones I have done so far have seen around a 60% increase on 6-7psi boost on standard internals... but again, this isn't BMW's as I aint done one. But have seen this typical gain on other cars with that pressure.

Post Fri Nov 23, 2007 6:27 pm

Awesome Ant!

As for the Turbo Vs Supercharger argument, N/A is better than both!

Post Fri Nov 23, 2007 6:32 pm

Ant, you got pm from me BTW!!

Post Fri Nov 23, 2007 9:05 pm

Recieved Paul

what model you got ? we used a Rotrex C30-94 dude.

Post Fri Nov 23, 2007 9:20 pm

Unfortunately Ant its the older SP type, not the later C series. But its brand new in a box. We used the SP-36 on the Suzuki Swifts, but this one is the next size up and does upto 4ltr cars. I found that the next size up to what they say works better than the size they say you need.

I am sure the mountings are the same on both SP and C series.

Post Sun Nov 25, 2007 10:53 am

Ant,
Can't wait to see one of these used in anger, have you fitted one to the Grandad?

Post Mon Nov 26, 2007 3:49 am

well ant i think your just a c**t lol 3 weeks from being finished and i see this hmmmmm oh well never mind lol ill be on the blower this week need some metric blues from you when all done ill go looking for buster lmao

Post Tue Nov 27, 2007 12:30 am

Post Tue Nov 27, 2007 11:20 am

Fuck it, who needs an ISA anyway

Post Thu Nov 29, 2007 12:38 am

Morat wrote:**** it, who needs an ISA anyway

keep saying it you'll convince yourself

Post Mon Dec 03, 2007 10:07 am

Guys have we got one of these running yet? any RR figures?

Post Wed Dec 05, 2007 11:26 pm

how is this coming along ant?? how much work is involed mate?? any more pic's??

Post Thu Dec 06, 2007 11:41 am

maxfield wrote:Awesome Ant!

As for the Turbo Vs Supercharger argument, N/A is better than both!

Not really. Forced induction lets you build an engine with a better power to weight ratio at that cost of added complication. As for the power curves/responses its each to their own. There's something very addictive about that shove in the back from a well set up turbo.

Post Thu Dec 06, 2007 11:51 am

Turbo car or NA car with same hp+torque. Which would be quicker?

Post Thu Dec 06, 2007 11:52 am

OT!

but I don't think you can generalise that much, too many specifics would be involved.
edit: which is pretty much my point. One isn't better than the other overall - its down to what you want and the specific application.

Post Thu Dec 06, 2007 8:32 pm

oooooooooooooooooh niiiiiice

would love to turbo my s38 but dont know where to get a metal hg and some pistons and what spec.....

Post Thu Dec 06, 2007 8:37 pm

Karan wrote:oooooooooooooooooh niiiiiice

would love to turbo my s38 but dont know where to get a metal hg and some pistons and what spec.....

You have a sick mind!

Although that would be an absolute animal!

I've seen 1000hp plus out of the S38!

Post Thu Dec 06, 2007 8:47 pm

gonna learn to tig and mig then im sure something can be dreamed up on the inlet and exhaust side but will need to contact some people on pistons....

its a big old thing so im sure huuuge power is possible out of it quite safely, and the ///m heads are awesome too

would just love to roll up next to a 600bhp skyline on the mway and blow it away in my ropey pink e30

Post Thu Dec 06, 2007 8:54 pm

Check out PPF or VAC Karan.

Both have parts and info available.

Its sooo wrong, but I love it :lol:

Post Fri Dec 07, 2007 4:57 am

its also so expensive LOL !!!!!!