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SC12 temps
https://ausmini.com/forums/viewtopic.php?f=5&t=28401		 Page 1 of 2
Author:  PetenSoaf [ Thu Feb 22, 2007 8:58 am ]
Post subject:  SC12 temps
Question for anyone out there that is actually running one of Ben Affords SC12 draw-through setups. . .what sort of inlet manifold/plenum temperatures are you getting (at a 'normal' 7-8psi)?
I don't need actual degrees but is the manifold hot to touch, cool, glowing in the dark?
Author:  kasperflipped [ Thu Feb 22, 2007 9:07 am ]
Post subject: 
mines kinda touchable but i wouldnt hold my hand on it, the exhaust manifold on the other hand, IS FREEKING HOT, which i have discovered by trying to adjust my carb mix!
Author:  PetenSoaf [ Thu Feb 22, 2007 10:28 am ]
Post subject: 
kasperflipped wrote:
mines kinda touchable but i wouldnt hold my hand on it, the exhaust manifold on the other hand, IS FREEKING HOT, which i have discovered by trying to adjust my carb mix!


Cool.
Exactly what I wanted to know. . .
Author:  Spaceboy [ Thu Feb 22, 2007 2:08 pm ]
Post subject: 
it is normally though..
Author:  slinkey inc [ Thu Feb 22, 2007 4:04 pm ]
Post subject: 
Kasperflipped, Ben Afford told me that on his s/c mini he uses an electrical connector (I assume he means a 'spade' connector) to get close to the carby and to avoid hand burnage.
Author:  92 [ Thu Feb 22, 2007 7:02 pm ]
Post subject: 
Yes the inlet manifold gets hot to touch because the air inside is being compressed so it heats up.With 7-8 psi boost inlet temps around 80'c are see when flat out.
Author:  PetenSoaf [ Thu Feb 22, 2007 10:02 pm ]
Post subject: 
92 wrote:
Yes the inlet manifold gets hot to touch because the air inside is being compressed so it heats up.With 7-8 psi boost inlet temps around 80'c are see when flat out.


No problem - the only experience I have had with supercharging is the AMR300 blow-through setup on my Moke. At 4-5psi, post compressor temps were about 40 degrees after extended running, and only just over ambient after the (small) intercooler. . .hence my surprise when, with your SC12 setup, after 2 or 3 minutes of idling, the inlet manifold was almost too hot to touch!
If 7-8psi leads to 80 degrees, what sort of temps do you see in your race car at 12psi plus??
Author:  slo_firo [ Fri Feb 23, 2007 6:49 am ]
Post subject: 
i use a flat head bit and a modified ratchet to adjust mine, works good cos i burnt my hand a couple times lol
Author:  DOZ [ Fri Feb 23, 2007 8:31 am ]
Post subject: 
kasperflipped wrote:
mines kinda touchable but i wouldnt hold my hand on it, the exhaust manifold on the other hand, IS FREEKING HOT, which i have discovered by trying to adjust my carb mix!


You can sort of tell temp by touch, check the chart here for example
Daniel
Author:  92 [ Fri Feb 23, 2007 6:07 pm ]
Post subject: 
My race car with 12+ psi boost about 100 degrees but I have water injection which brings it down to about 80
Author:  PetenSoaf [ Fri Feb 23, 2007 7:20 pm ]
Post subject: 
92 wrote:
My race car with 12+ psi boost about 100 degrees but I have water injection which brings it down to about 80


Ah hah! That was my next question. . .I assume that you put the bunged port on the carb-to-supercharger manifold with water injection in mind?
Author:  92 [ Sun Feb 25, 2007 8:16 am ]
Post subject: 
The plugged port I have just started fitting is meant for a vacume takeoff for a brake booster but, a water nozzle could be scewed in there.
Author:  Damo [ Tue Mar 06, 2007 10:16 am ]
Post subject: 
92 wrote:
My race car with 12+ psi boost about 100 degrees but I have water injection which brings it down to about 80


Where did you get your new pulley for increased boost?

92 wrote:
The plugged port I have just started fitting is meant for a vacume takeoff for a brake booster but, a water nozzle could be scewed in there.


I'm guessing mine does not have this port? I only have the point in which my boost gauge comes off. Any pics of where you have put your water injection nozzle? I'm fairly interested in fitting this considering an intercooler is an impossibility.

Side note - Cheers for making this kit! MOKEME is bloody quick now. 1275cc A+ with static compression down to about 8.3:1. The boost gauge currently indicates up to about 9psi, but she is ripe for a little more boost I reckon. :twisted:
Author:  PetenSoaf [ Tue Mar 06, 2007 2:51 pm ]
Post subject: 
Shows what the extra capacity of a 1275 does - on the stock 998 (std head, cam etc) in my Moke, Ben's SC12 kit will make 11psi when driven HARD (makes the ol' girl bark a bit!).

As far as the water injection goes, it'll be interesting to see what Ben says. . .
However:
I cobbled together what appears to be a pretty effective system in the end, and I DIDN'T use the 'new' port on the carb-to-supercharger manifold.
I drilled a small hole into the carb (HIF6) on the upstream side of the throttle butterfly and epoxied in a short section of 1.5mm ID metal tubing. . .I squashed the end of the tube almost flat to create a bit of a restriction, and connected the other end to a plastic container full of water with some tubing.
The air flow will draw water out of the 'nozzle' at a rate depending on how much you squashed the end of the tube. Doing it this way, as airflow increases, water flow increases. If you put the water line on the downstream side of the throttle butterfly, the water will be drawn out by engine vacuum, so you get lots of water at idle and not much when running flat out.
Sure, you can set up a fancier system with pumps and pressure switches and the like but, apart from running the water reservoir dry, this system is almost failsafe.

On a side note, if you go this way, put the water reservoir as low as possible in the engine bay - if you put it up high, you run the risk of all the water running into the motor when it's switched off and hydraulicing the thing solid (not a good look :D ).

Now, let's see what Ben says. . .
Author:  92 [ Tue Mar 06, 2007 6:51 pm ]
Post subject: 
Extra Boost I made a bigger pulley for the crankshaft can be done quite easy just don't turn the pulley down as much.
Water injection using a venturi on the inlet of the carb will work OK the water is probably not atomised for maximum effect but OK, and the rate of flow varies which is good.
My water injection uses a pump and pressure switch and a nozzle which atomoises the water to a very fine mist it is injected just as it enters the SC and is turned on at about 5psi of boost. The nozzle regulates the flow which is about 10pc of the amount of fuel it uses so the engine uses about 700ml of fuel per minute under fullload so inject about 70ml of water.
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