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help please sc 1100
https://www.ausmini.com/forums/viewtopic.php?f=5&t=42980		 Page 1 of 2
Author:  the vanman [ Sat Jun 14, 2008 10:24 pm ]
Post subject:  help please sc 1100
i have just rebuilt my 1100 and would like to supercharge here is whats done;
want to run on gas to later supercharger just a thought at the moment.
only standard pistons 20tho over
1275 cooper s valves
hardened valve seats for gas unleaded
ported and polished head around the same size as 12g940
fast road/rally cam
shaved head and block decked to bring compression up for lpg
center main strap
balanced
compression around 9.5;1
now can i safely sc this and if so how much boost can i run and will it make much difference.
later on i want to put a r1 or bussa engine in fwd i need something that will fit in my clubman front but i don't want to butcher the inner guards.
can i sc without having to change anything or do i leave it and wait for a bike engine.
Author:  sox61 [ Sun Jun 15, 2008 1:07 am ]
Post subject: 
Your compression is a little high for boost. You would get away with 8.5, but 9.5 I don't think so. You would be running next to no boost. Cam may also be an issue, if the overlap is too big it can have issues with boost as I found out.

I would leave as is and keep praying they let you put a bike motor in your mini...
Author:  Kennomini [ Sun Jun 15, 2008 5:26 pm ]
Post subject: 
Yeah it sounds like your comp ratio is too high, SC probably won't be safe on that engine.
Tell us more about your gas conversion/setup.
Author:  the vanman [ Sun Jun 15, 2008 9:07 pm ]
Post subject: 
i have a gas setup out of a ford econervan and i would like to keep inside tank free if i can find some tanks to fit up in the space in the back subframe and where the fuel tank is.
if i can get about 60ltrs of gas i may be able to get 1000ks out of a tank, how good would that be.

i plan to run the car on gas only so power and econ will be good at gas is 110 octane like avgas.
Author:  Kennomini [ Sun Jun 15, 2008 9:31 pm ]
Post subject: 
Try asking some local Gas conversion workshops about the clearance you would need under the tanks too the ground and if they can get tanks that small. I imagine you'll need 2,3 or 4 tanks all plumbed together with a diameter of aprox 200mm each :? and they can't be that long either because they have to fit inside the subframe :( .
If your van is drivable try taking it with you so they can see it in the flesh, might help them help you.
Author:  pristic [ Mon Jun 16, 2008 1:14 pm ]
Post subject: 
Mine is 1100 turbo - running 10psi and 9.5:1 comp. Only issues were that it kept bending valves. New k-lined guides and Mk1 S valves and no issue.

I wouldnt run much more than 10psi though.

Not sure if SC is different though... like I said, my turbo setup handles it fine.

Pete
Author:  the vanman [ Mon Jun 16, 2008 8:04 pm ]
Post subject: 
do you think a AMR300 would do the job i am thinking 6-8psi how much difference would that make?
have you hade your car on a dino, what is done to your engine and how much hp is it making.
Author:  mattsmadmini [ Mon Jun 16, 2008 8:08 pm ]
Post subject: 
mmmmmm dino....

Image
Author:  spraycanmansam [ Mon Jun 16, 2008 8:54 pm ]
Post subject: 
the vanman wrote:
do you think a AMR300 would do the job i am thinking 6-8psi how much difference would that make?
have you hade your car on a dino, what is done to your engine and how much hp is it making.


AMR300 is way to small.. if you do a search for AMR500 or 300 ( can't remember which ) there's a few articles on it :)

Even an AMR500 would be pushing it... You'd be better with a bigger charger = less heat = denser charge = more power on the same boost 8)
Author:  albino235 [ Mon Jun 16, 2008 9:18 pm ]
Post subject: 
I did some calcs on the AMR chargers a while ago and if I remember correctly you would be maxing out an AMR500 to run even 10psi on a 998...
If I were you I would look at one of the rotrex (spelling) chargers, they are expensive but they are tiny, don't need any oil lines and are very effecient :)
Author:  albino235 [ Mon Jun 16, 2008 9:19 pm ]
Post subject: 
Here is a link if your interested
Author:  Kennomini [ Mon Jun 16, 2008 9:38 pm ]
Post subject: 
I was going to use an AMR300 (the 300 stands for the amount of air cc's it pumps per revolution, same with the AMR500) My 998 engine died before I could charge it and I also fu@ked the blower before installation. on an 1120cc engine I would be looking for a bigger SC ask for something off a 1.1L or bigger but not hugely bigger.
5-8 PSI would be very good especially on an engine with high compression like yours. My brother was running 5-8 PSI on his 4x4 Feroza and it doubled his hp so you will definitely notice the difference.
Author:  wyan [ Mon Jun 16, 2008 9:41 pm ]
Post subject: 
Yeah the Rotrex ones are ment to be pretty sweet, but from memory I think they start at about $2700 or something??... pricey
Author:  sox61 [ Tue Jun 17, 2008 12:15 am ]
Post subject: 
pristic wrote:
Mine is 1100 turbo - running 10psi and 9.5:1 comp. Only issues were that it kept bending valves. New k-lined guides and Mk1 S valves and no issue.

I wouldnt run much more than 10psi though.

Not sure if SC is different though... like I said, my turbo setup handles it fine.

Pete


Well there you go. I was told it was getting a bit high, but as Pete has said his handles it.. I don't think it would make a difference whether it was a snail or a blower, just use a good head gasket and make sure the block and head are flat. I use a metro turbo gasket (1275 head :wink: )
Author:  drmini in aust [ Tue Jun 17, 2008 6:44 am ]
Post subject: 
I think you will find a huffer gives boost well before a turbo does, so more likely to give detonation or pinging, the air is hotter too (with no intercooling).
I'd be aiming for not more than 8.5:1 with a supercharger. :wink:
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