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Old 10-27-2007, 05:12 PM
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second place is the first losr
 

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383 blower

just want to know if someone try 142 blower on a 383 im building this for a friend he have 18 cc dished hyper piston is it ok for run on pump gaz with 64 cc aluminium head he can also have 28cc dish piston

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Old 10-27-2007, 05:26 PM
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Personally I wouldn't go with anything less than a forged piston with forced induction. I only like to build engines once.
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Old 10-27-2007, 05:30 PM
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second place is the first losr
 

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ok i anyway i think he need more dished piston to run on pump gaz im check for a forged set thanks
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Old 10-27-2007, 06:18 PM
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You would want to use the -28cc dished piston and open up (unshroud) the combustion chambers in the heads a good bit to get the cr down under 8.5:1.
A low compression ratio works best on a pump gas blower motor.
A lower cr allows you to run the most blower boost.
Optimum for a roots style blower without water injection on 92 octane fuel is 7.5:1. Allows 10-12lbs boost with little or no spark retard and makes the most reliable power. A higher cr will limit the amount of boost and require more spark retard and limit the amount of reliable power you'll make.. A true 8.5:1 cr allows around 6-7psi only requireing a moderate spark retard to stay out of detonation. (26 to 31deg total advance under boost)

A hyper piston will withstand 6-7psi as long as you avoid detonation (too much spark timing, lean jetting, lack of fuel system volume, excessive blower boost).
When used in a supercharged motor a hyper piston needs a much larger top ring end gap. Open the ring end gaps up or they will butt at WOT and rip the ring lands off the pistons faster than you can say mom's your uncle.

If the compression ratio, boost, spark timing and jetting are right and the ring end gap is opened up then a cast piston will not be a problem at 6-7PSI and 8.5:1 or less compression. Detonation in a supercharged motor is much more severe than a little pinging in a N/A motor. Detonation must be avoided. Water injection is very effective in supressing detonation at WOT while under boost. Allows more boost and spark timing and power on pump gas.

Use a cooler than normal heat range spark plug. A non-projected tip cool heat range spark plug is best for a supercharged application.
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Old 10-27-2007, 07:12 PM
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second place is the first losr
 

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thank you very much f bird88 that exactly what i want to know im going to install this motor in a off road truck with 44 tire do you thinks the guy will be happy i dont what kind of low end torque a supercharger give
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Old 10-27-2007, 07:29 PM
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Just be aware that ultimatly a cast pistons not as strong as a forged piston. A forged piston will tolerate abuse more and longer than a cast piston will.
If you deviate from proper engine tuneup or the owner of the truck changes something. (change spark timing, use crappy low octane fuel, change blower drive ratio or use the wrong carb jetting or spark plug heat range or the cooling system is not up to the task of keeping the engine temps in check and the motor goes into detonation (spark knock) the cast piston will not take that kind of abuse.
It's the f**c-ups and abuse you have to expect from the owner, that you have to over build for. Thats why forged pistons are in general recomended on a supercharged motor.

If the motor will be used mainly at low rpm 9idle to 4500rpm (4x4ing with big diameter tires) I would build this motor with a very low cr and or limit the boost. Go easy on camshaft as well. a mild duration hyd cam is plenty. Let the blower make the horsepower. 4X4ing is all about torque.
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Old 10-27-2007, 08:03 PM
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You got a leaky spark tube...
 
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Have you thought about using a 177 in place of the 142? I know the owners manual says that a 142 on a stock 350 is good for about 6 psi and about 4 psi on a 400. A 177 might be a better choice for a 383.
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Old 10-27-2007, 08:26 PM
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second place is the first losr
 

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does the 177 use a single 4 bbl ?
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Old 10-27-2007, 08:34 PM
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yes it does. I tried a 142 (or 144, been a while) on a 400 that was warmed over and could only pull 2 lbs of boost. needless to say I wasn't happy. go to the 177 like blazin recommended if you can.
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Old 10-27-2007, 09:23 PM
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You got a leaky spark tube...
 
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