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Re: Supercharger Dilemma sc14 vs sc12 vs amr500
No life (a.k.a. DattoMaster)
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I used the Mercedes Kompressor off of one of those SLK cars. Don't know the specs on it but it pushed 10 pounds of boost on my A15 until I toasted it. The Nitrous didn't help it either other than to make it go faster! I think this SC going to work well on my Z24 motor. Tomorrow I'm headed over to my friends to fire up the aluminum welder to try and finish the intake. Canby's weekend is only 2 weeks out and I wanted to be racing in Portland that weekend.

Posted on: 2010/5/31 19:26
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'73 2 Door Sedan
KA24DR, Twin Webers 38/38 Sync.
Crower Stage 3 Cams/SS Valves
Forge CP Pistons/ Eagle Rods
Eaton M62 SC 10 lbs. Boost / 160hp Progressive Nitrous
GM 2 Speed Poweglide/Transbrake 3500 Stall
Ford 8.8/Mini Spool/4.11
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Re: Supercharger Dilemma sc14 vs sc12 vs amr500
No life (a.k.a. DattoMaster)
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Bart

How did you sc14 run with the a14? any missing down low?
Ive seen some corolla motors in the 1.5 range have downlow issues with the sc14
even with a supposedly sc cam grind. Maybe their ports are just too limiting?
Also there are countless other factors like manifold design and ignition.
Im interested in running the same one in an a15 but worried about low boost down low.
Hence the interest in the amr500 in a 1200 working better as it should have better
response at it runs 2:1 ratio

1.189cc X 6500rpm = 7728.5 litres/minute (divided by 2 to get actual amount)
7800/2 = 3864.25 litres/min engines air req at 0psi boost
14.7psi atmospheric pressure + 10psi desired boost = 24.7psi
boost ratio = 24.7/14.7= 1.68
Actual air required for 10psi boost @ 5000rpm = 3900litr/min X 1.68 = 6552 litr/min
RPM needed by AMR500 (0.5 litre swept volume) for 10 psi boost at 6500rpm
6491.94/0.5 litres = 12983.88 rpm
pulley size ratio = 12983.88/6500rpm = 1.99752
So circumference of crank pulley would have to be 200% of the circumference of the SC pulley

Exact pulley required for a12 @ 6500 (1.189cc)

1189cc @ 6500rpm = 2:1
Max supercharger RPM will see is 12,983.88 RPM at peak
Supercharger is rate Max peak @ 16,000 RPM

So this is a good setup for 10psi A12 with 6500 redline
as the supercharger should be quite responsive.

For A15 77mm overbore 1527cc and sc14 @ 10psi pulley ratio 0.9:1

For 1527cc A15 SC12 @ 10 psi pulley ratio 1.07:1

Posted on: 2010/6/1 3:01

Edited by D on 2010/6/1 4:08:27
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Re: Supercharger Dilemma sc14 vs sc12 vs amr500
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I ran a sc14 on my a15 and it made 10psi as soon as you stomped the pedal

Posted on: 2010/6/1 3:31
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Re: Supercharger Dilemma sc14 vs sc12 vs amr500
No life (a.k.a. DattoMaster)
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go1200 any pics, details (induction), experiences at higher rpm or links?

Ernie, what a monster you are brewing!!! The H190 are going to have fun holding the force.
Talk about Torque.

here are some photos of Barts setup before the Holley (hope you dont mind Bart?)
Just wondering if you are still using the clutch style pulley?
Also have you considered a 1.75 stromberg as a sidedraft siting on an angle manifold
so the carb sits about the inlets? The strombergs can supply enough mix for halve a
jag engine or Rover v8 so about 2 to 2.5 litres NA or is that not enough?

Attach file:



jpg  1200sce5.jpg (69.03 KB)
737_4c0479f5815a4.jpg 692X519 px

jpg  1200s1qx0.jpg (58.83 KB)
737_4c047a024f9df.jpg 519X692 px

Posted on: 2010/6/1 3:58
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Re: Supercharger Dilemma sc14 vs sc12 vs amr500
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D there are pics on here somewhere from when i was selling the motor.

Induction was a suck through 350 holly but i did have a 2inch su i was going to try but ended up getting the holly right

boost was 10psi in the first two gears and would get upto 16psi in the top two gears.

Posted on: 2010/6/1 5:15
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Re: Supercharger Dilemma sc14 vs sc12 vs amr500
No life (a.k.a. DattoMaster)
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S5-150 sprintex all day... :)

Posted on: 2010/6/1 6:32
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'68 Thou Wagon,(home now) up and running
'69 2 door project, the yellow thing,
A12A Project motor, for the yellow thing.
A15 PSI Project Motor
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Re: Supercharger Dilemma sc14 vs sc12 vs amr500
No life (a.k.a. DattoMaster)
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D,
When I ran the SC14 on an A14, it made max boost instantly. No down low miss, no hesitation. Just lots of traction problems. I wouldn't worry about low down response issues with the larger pump.
I wouldnt use a dashpot style Variable main jet carb on a supercharged motor. When I ran the weber, it used to make 5psi on the primary, and 11psi (I think) with both holes open. The further the throttle is open, the more boost it made. Having to wait for the dash pot to rise would cramp my style. I think you'd get better response and control with a conventional type carb. I
I still have the weber, air filter, and the SC carb adapter in the above pics if you were interested?
I Might add that the 11psi figure above was running an N/A performance cam which had too narrow a lobe seperation angle, so some boost might have been bled off. When I ran an A14 with a Stock cam, it made around 1 bar. Which is too much without some additional detonation control measures. (see pic of smashed piston in my album)

I'm still running the clutch pulley too. I've not pulled it apart yet, but I've heard it's a bit of a challenge to delete the clutch set up. I can get you a very sharp price for a custom three piece crank pulley to suit the Toyota blower pulley. Being three piece you can change the ratio of the crank or blower drive pulleys with ease.

Posted on: 2010/6/1 7:44
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Forced Induction!
Because everyone knows you don't bring a knife to a gunfight!
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Re: Supercharger Dilemma sc14 vs sc12 vs amr500
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Here's some pics of go1200's setup. Worked so well, the boost was so good as soon as you hit the pedal.

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Posted on: 2010/6/1 9:30
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Re: Supercharger Dilemma sc14 vs sc12 vs amr500
No life (a.k.a. DattoMaster)
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Some great pics and information!
Love the alloy pulley system and it looks like Ill have to go sc14 now
with the A15, I dont want more than 10psi at 6000rpm.

Bart, is that a 32/36 carb or other? Shouldnt a stock cam and the right pulley
make a difference to reduce detonation at 10psi?

Gav/Go1200 I wonder what pulleys where used from other cars?

Posted on: 2010/6/1 13:12
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"Australia" is formed by all its geographically listed territories "including" Norfolk, Christmas & Cocos Islands. The word include excludes all else before it therefore you have no legal rights.
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Re: Supercharger Dilemma sc14 vs sc12 vs amr500
No life (a.k.a. DattoMaster)
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Still using the clutch drive. Right now I have the dual downdraft Weber's mocked up sitting though the hood under the scoop so the hood closes nicely and you can't see them. In the A15 I had to down jet the carbs to make it run right so they should have no trouble working on the Z24 motor. I know Bart recommended the Holley but the Weber's are going to fit better and I think I would rather go with the mechanical secondaries. My Holley has a vacuum secondary. I am going to try and get some welding done today.

Posted on: 2010/6/1 14:08
_________________
'73 2 Door Sedan
KA24DR, Twin Webers 38/38 Sync.
Crower Stage 3 Cams/SS Valves
Forge CP Pistons/ Eagle Rods
Eaton M62 SC 10 lbs. Boost / 160hp Progressive Nitrous
GM 2 Speed Poweglide/Transbrake 3500 Stall
Ford 8.8/Mini Spool/4.11
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