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Anonymous Poster #1

ProCharger 1-DSC Supercharger

04/06/2011 5:16 AM

I would like to know the highest compression Rato piston I could use in my 1969 AMC 395cid Engine, using ProCharger 1-DSC Supercharger with air to air Intercooler.

Thank you,

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#1

Re: ProCharger 1-DSC Supercharger

04/06/2011 8:52 AM

a lot of factors here. street,track or both. guys are now running methanol injection to compensate. this is basically windshield washer fluid. what octane do you use ? do you run electronics for detonation. when in ? ask procharger.

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#2

Re: ProCharger 1-DSC Supercharger

04/07/2011 5:54 AM

On a super (or Turbo) charged engine, increasing the pressure of the charging is a far better method to increase power, even possibly reducing the compression ratio can be a benefit with higher charging pressures.......more power with less chance of damaging the engine......

There are electronic kits around to vary Turbo charger pressures for some systems/cars.....I have even seen the waste gate solenoid signal being put through a simple variable resistor.

With no resistance in circuit the waste gate worked as designed by the manufacturer, with some resistance inserted, the waste gate opened later and pressures were higher.....That was in a Ford RX3(?) or similar!!! Many years ago!!

Not all chargers have a waste gate though.....I am informed....me not being an expert on any form of charging!!

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Anonymous Poster #1
#4
In reply to #2

Re: ProCharger 1-DSC Supercharger

04/07/2011 8:47 AM

Thanks Andy,

that helped quite a bit.

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Guru

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#3

Re: ProCharger 1-DSC Supercharger

04/07/2011 8:46 AM

I thought that car came with a 390?

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Anonymous Poster #1
#7
In reply to #3

Re: ProCharger 1-DSC Supercharger

04/07/2011 3:55 PM

I had to have it boored out.

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#5

Re: ProCharger 1-DSC Supercharger

04/07/2011 9:42 AM

The short answer is:

8.5:1 with cast iron heads

9.5:1 with aluminum heads

This *assumes* pump gas is the fuel, and street/strip is the application.

I've gone as high as 13.5:1 on a twin-turbo setup, but it was track only and methanol fueled.

Your cam timing and anticipated max boost level will influence the allowable compression ratio. There are online calculators to see how cam timing and boost will affect dynamic compression.

Your intercooler's thermal efficiency and pressure drop also need consideration.

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Anonymous Poster #1
#6
In reply to #5

Re: ProCharger 1-DSC Supercharger

04/07/2011 3:31 PM

Thank you,I will use calculations on internet,with Inter cooler.

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