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Guhu
Dodge Dakota
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6/06/2005
09:33:01
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 Subject: 9:1 or 8.5:1
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I will be getting a new 318 block soon and wanted to get an idea on what compression to run.
I have aluminum heads and will be running 10# of boost.
thnks
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nater44
Dodge Dakota
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6/06/2005
22:23:07
| RE: 9:1 or 8.5:1
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run a 9.0 with aluminum heads. You lose about a point of compression with aluminum heads compared to cast iron heads, due to the faster rate of heat dissipation of aluminum
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no
Dodge Dakota
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6/07/2005
09:29:50
| RE: 9:1 or 8.5:1
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Don't plan on running 10# with 9:1, you'll go through head gaskets faster than Kirsty Alley goes through Malomars. Shoot for 8:1 and up the boost if needed, it's a whole lot easier than lowering the CR after you've built your motor.
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Mr. duh
Dodge Dakota
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6/07/2005
10:08:55
| RE: 9:1 or 8.5:1
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ask a professional
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GuHu
Dodge Dakota
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6/07/2005
15:37:32
| RE: 9:1 or 8.5:1
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If i was to run the 8:1, would that hurt my bottem end speed, or would it just help prolong the life of the headgasket.
My S/C is actually a powerdyne with the 9# pulley, so is 8:1 still recomended?
Thanks, i am new to all of this.
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gen1dak
Dodge Dakota
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6/09/2005
12:21:32
| RE: 9:1 or 8.5:1
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The SC will cover lower CR so the low-end power will be fine. Stay conservative on the boost and CR. A little too much means blown head gaskets, or toasted pistons. Superchargers are like "instant-on" power. They pull from down low. You just don't want to exceed what your engine can handle in current configuration. To handle more boost, you need o-ringed heads and forged pistons for starters.
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gen1dak
Dodge Dakota
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6/09/2005
12:28:22
| RE: 9:1 or 8.5:1
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The SC will cover lower CR so the low-end power will be fine. Stay conservative on the boost and CR. A little too much means blown head gaskets, or toasted pistons. Superchargers are like "instant-on" power. They pull from down low. You just don't want to exceed what your engine can handle in current configuration. To handle more boost, you need o-ringed heads and forged pistons for starters.
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GuHu
Dodge Dakota
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6/09/2005
13:14:14
| RE: 9:1 or 8.5:1
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o-ringed heads, what do ya mean by that, kinda n00b here. I just had aluminum heads put on, any way i can tell if they were o-ringed?
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daddio
Dodge Dakota
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6/09/2005
13:33:42
| RE: 9:1 or 8.5:1
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actually i believe it would be the block to be o-ringed.
i believe whatever manufacturer you buy your kit from should be able to answer all your questions otherwise i'd shop somewhere. my .02
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gen1dak
Dodge Dakota
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6/09/2005
21:11:31
| RE: 9:1 or 8.5:1
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Yeah, the block was what I meant. I do that all the time. Although, some methods involve cutting the o-ring groove in both the heads and the block, it's preferred on Mopars to groove the block only....from what I have read.
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