Benzine
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| posted on 25/1/08 at 10:08 PM |
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Locost supercharging
Are the only relatively affordable superchargers available roots type? What would a new/used centrifugal type cost? I see plenty of eaton M45s, M62s
and M112s on ebay but I've not seen a centrifugal type on ebay. (not been looking for that long though)
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NeilP
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| posted on 25/1/08 at 11:01 PM |
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The centrifugals are usually a bomb - I'd like the Rotrex fairy to visit but don't think that's going to happen any time soon.
With a small Eaton at low boost you might be able to get away with no intercooler and if you do need to alter the comp ratio then a thicker head
gasket might do...
If you pay peanuts...
Mentale, yar? Yar, mentale!
Drive it like you stole it!
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carpmart
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| posted on 26/1/08 at 12:24 AM |
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quote:
Originally posted by NeilP
The centrifugals are usually a bomb - I'd like the Rotrex fairy to visit but don't think that's going to happen any time soon.
With a small Eaton at low boost you might be able to get away with no intercooler and if you do need to alter the comp ratio then a thicker head
gasket might do...
Why would you not use an intercooler? It adds very little by way of complexity and the extra weight is minimal. The return in power for the
reduction in charge temp can be very significant!
You only live once - make the most of it!
Radical Clubsport, Kwaker motor
'94 MX5 MK1, 1.8
F10 M5 - 600bhp Daily Hack 
Range Rover Sport - Wife's Car
Mercedes A class - Son's Car
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RazMan
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| posted on 26/1/08 at 04:52 AM |
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Agreed, the complicated / expensive part is strapping the s/c on so the i/c can then follow without too much extra fuss.
The choice between air / air or air / water can hike prices up a bit though 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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bimbleuk
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| posted on 26/1/08 at 07:34 AM |
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Hi before I finally took the plunge on the Rotrex I was a watching ebay regularly for superchargers. So yes 9 out of 10 on ebay are roots type. The
majority being M45 BMW Mini (I bought n sold 5 of those myself!) units then m62 and M90s from Jags. Some RO yank V8 blowers. Occassionally a sprintex
twin screw from Rover V8s and I even bought and sold a twin screw from a SL55 AMG twin screw which was huge!
In that time I saw two Rotrex SCs one in Belgium and a ropey one in the UK. Both went for around the £750 mark!
Just had a look and as usual plenty of Mini superchargers on there and now the listings are swamped with those ridiculus electric supercharger rip
offs!
Roots are easy to mount and don't necessarily need an intercooler to work at low boost. Twin screws can actually be the easiest to mount but do
need an intercooler to work efficiantly. Twin screws can be treated like a roots. You could get away without an iontercooler at low boost but ideally
needs one. Main thing is the mounting on a twin screw as it only takes a tiny amount of distortion for the rotors to touch and destroy the unit!
[Edited on 27/1/08 by bimbleuk]
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stevec
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| posted on 26/1/08 at 08:27 AM |
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Guess what I do for a job now,
This is my workbench.
Steve..jpg)
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Richard Quinn
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| posted on 26/1/08 at 09:13 AM |
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quote:
Originally posted by stevec
Guess what I do for a job now,
This is my workbench.
Steve.
Sweep up using the brushes that come with instruction labels attached? 
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stevec
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| posted on 26/1/08 at 09:54 AM |
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quote:
Originally posted by Richard Quinn
quote:
Originally posted by stevec
Guess what I do for a job now,
This is my workbench.
Steve.
Sweep up using the brushes that come with instruction labels attached?
Well spotted, but they are actually mops.
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billynomates
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| posted on 26/1/08 at 11:13 AM |
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quote:
Originally posted by stevec
Guess what I do for a job now,
This is my workbench.
Steve.
Did you know there was a ghost on the other side of that window?
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Guinness
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| posted on 26/1/08 at 12:25 PM |
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quote:
Originally posted by billynomates
Did you know there was a ghost on the other side of that window?
Spooky! 
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bimbleuk
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| posted on 27/1/08 at 07:27 AM |
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Is that a Rotrex with the Antonov gearbox on the workbench?
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thomas4age
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| posted on 27/1/08 at 08:11 AM |
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I'd say the workbench is somewhere on the TTS building/site.
looks like the antonov electrical box, justin but can't tell really good.
would love to have 2 of those on the lexus.
grtz thomas
If Lucas made guns, Wars wouldn't start either.
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bimbleuk
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| posted on 27/1/08 at 01:50 PM |
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Well maybe but when I was at TTS last time they showed me a dyno of the two speed Rotrex and at the time the transition was too harsh for hard drivng.
Was some time a go so things may have changed.
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