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wiltz
Firing on two.
Joined: June 15th, 2009, 6:08 pm
Posts: 161
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 Re: Aussie' Kermit Harley wrote: I finally started building the supercharger inlet plenum out of an old fire extinguisher and steam pipe. Now it's off to my brothers to glue it together with the tig.  I'm thinking I will be able build an alternator mount on the other side off the fuel pump mount... It was a good day  Harley OOOH that looks cheeky 
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| October 11th, 2013, 10:33 am |
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panelbeaterpeter
Firing on two.
Joined: April 24th, 2011, 6:05 pm
Posts: 226
Location: Everywhere
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Re: Aussie' Kermit This is great, smart idea with the rear panel. Looking forward to seeing more updates!
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(°\=/°)
1989 2CV6 (what's a D*lly?), 1989 MG 1275 powered mini, Renault Trafic.
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| October 12th, 2013, 2:31 pm |
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Harley
Firing on two.
Joined: May 3rd, 2009, 11:40 am
Posts: 816
Location: Melbourne, Australia.
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Re: Aussie' Kermit panelbeaterpeter wrote: This is great, smart idea with the rear panel. Looking forward to seeing more updates! Thanks Peter, looking forward to seeing more from you also!  Mounted the throttle body today, was able to tig a plate on to the end of the original supercharger inlet.    Still need to die grind the inlet a bit...  Harley
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samfieldhouse wrote: It is M9 for the shocks yes, the rest I'll check when next i'm underneath her. Ironically, this will be valentines day.
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| October 18th, 2013, 6:00 am |
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lpgo
Firing on 1-2 Spark
Joined: November 8th, 2009, 5:42 pm
Posts: 2847
Location: NL
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Re: Aussie' Kermit I say only this, make a dumpvalve......
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Russell wrote: Hi Geo,
you've been one of the sites biggest attractions in recent years.
Russ
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| October 18th, 2013, 7:18 am |
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Harley
Firing on two.
Joined: May 3rd, 2009, 11:40 am
Posts: 816
Location: Melbourne, Australia.
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Re: Aussie' Kermit lpgo wrote: I say only this, make a dumpvalve...... Already got one  I will mount it once the manifold is finished and fitted. Also need to find an alloy end piece of the correct diameter.... I had a present arrive from master Barbour today 2-1 exhaust Harley
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samfieldhouse wrote: It is M9 for the shocks yes, the rest I'll check when next i'm underneath her. Ironically, this will be valentines day.
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| October 18th, 2013, 10:37 am |
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evilben
Firing on two.
Joined: October 28th, 2011, 5:40 pm
Posts: 328
Location: Cornwall
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Re: Aussie' Kermit Trying to make a 2cv go fast... very odd but in a good way!! nice one.
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www.evilbens.blogspot.com
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| October 19th, 2013, 9:36 am |
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Lars E
Firing on two.
Joined: April 17th, 2009, 8:30 pm
Posts: 111
Location: Aale city, denmark
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Re: Aussie' Kermit lpgo wrote: I say only this, make a dumpvalve...... why??? throttle valve located before the compressor. There is no need for such only if the throttle is positioned after
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 2cv special 0,6Tii
viewtopic.php?f=5&t=1610
http://snail.s4.bizhat.com/viewtopic.ph ... orum=snail
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| October 20th, 2013, 12:37 pm |
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Harley
Firing on two.
Joined: May 3rd, 2009, 11:40 am
Posts: 816
Location: Melbourne, Australia.
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Re: Aussie' Kermit Lars E wrote: why???
throttle valve located before the compressor.
There is no need for such only if the throttle is positioned after By fitting a dump valve after the throttle you can reduce pumping losses by allowing the supercharger to "free wheel" at idle and cruise, making it more efficient. Otherwise it is sucking against a closed throttle, building extra heat and greatly increasing pumping losses. Looking at the VGS 2CV, I think the throttle is after the supercharger so they need a bypass valve otherwise on throttle close it would stop the supercharger from spinning destroying belts and possibly bending the throttle shaft. The advantage is much crisper throttle response being closer the the inlet valves. Harley
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samfieldhouse wrote: It is M9 for the shocks yes, the rest I'll check when next i'm underneath her. Ironically, this will be valentines day.
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| October 21st, 2013, 12:30 am |
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Lars E
Firing on two.
Joined: April 17th, 2009, 8:30 pm
Posts: 111
Location: Aale city, denmark
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Re: Aussie' Kermit I can understand your thought, but when the throttle is closed, the compressor will run in a vacuum, and run on free wheel.
A dump valve after the throttle will make false air.
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2cv special 0,6Tii
viewtopic.php?f=5&t=1610
http://snail.s4.bizhat.com/viewtopic.ph ... orum=snail
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| October 21st, 2013, 9:38 am |
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Harley
Firing on two.
Joined: May 3rd, 2009, 11:40 am
Posts: 816
Location: Melbourne, Australia.
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Re: Aussie' Kermit Lars E wrote: A dump valve after the throttle will make false air. This is one of the myths of supercharging i believe. Everything I have learn't has been from literature, practical books not the net, but I don't have real world experience yet... Without a dump valve (bypass valve) there will be a vacuum of up to 15inches of water before the supercharger, this creates a small amount of heat & pumping losses, so the suprcharger is not free wheeling. So when set up correctly the bypass valve will only operate in the event of a vacuum, which is why it is there. With a bypass valve on a roots type supercharger the recirculating air does not heat up each time it passes the S/C as it has no internal compression ratio. A bypass valve will allow the engine to operate in the even that the S/C fails, either through seizure or belt snapping. A bypass valve also places less load on the starter motor at start up. I found this interesting: click for link.Quote: For highly boosted engines it can be better, not only to employ a bypass system, but also to place the throttle after the supercharger so there is no heat build up off-boost. A throttled supercharger on a racing engine, in the light load, high revving, condition during the seconds before the start of a race, can heat up nearly to the point of seizure, so as the car gets off the line both the blower and the engine (as the excess heat dissipates into the system) are under extreme stresses that do not apply at other times. Reliability is much improved with a bypass and throttling after the supercharger.
Harley
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samfieldhouse wrote: It is M9 for the shocks yes, the rest I'll check when next i'm underneath her. Ironically, this will be valentines day.
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| October 22nd, 2013, 4:44 am |
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