lowering the compression ratio? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 39 (permalink) Old 01-20-2009, 12:26 PM Thread Starter
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lowering the compression ratio?

what are the advantages, benifits of doing this? at what point would one consider this? allowing more boost i guess would be one reason. just curious..

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post #2 of 39 (permalink) Old 01-20-2009, 12:30 PM
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Re: lowering the compression ratio?

Lowering the compression ratio mechanically reduces cylinder pressure, which is easier on the rotating assembly. It allows the engine to easier handle higher boost and fuel volume, there is more area in the cylinder. The correct way to do it is machining out the piston's bowl, like this:


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post #3 of 39 (permalink) Old 01-20-2009, 10:38 PM
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Re: lowering the compression ratio?

Another way to do it is like this.
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post #4 of 39 (permalink) Old 01-20-2009, 10:41 PM
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Re: lowering the compression ratio?

Who does this? And how much does it cost? Do you just use Mahles for this? Thanks.
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post #5 of 39 (permalink) Old 01-20-2009, 10:45 PM
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Re: lowering the compression ratio?

I just used the stock pistons as they were fine and had my uncle cut them for me. Most everyone uses Mahles (which is the oem manufacture).

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post #6 of 39 (permalink) Old 01-20-2009, 10:57 PM
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Re: lowering the compression ratio?

Another vote for machining the bowls!


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post #7 of 39 (permalink) Old 01-20-2009, 11:25 PM
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Re: lowering the compression ratio?

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post #8 of 39 (permalink) Old 01-20-2009, 11:43 PM
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Re: lowering the compression ratio?

How much does this effect starting in colder climates?
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post #9 of 39 (permalink) Old 01-20-2009, 11:58 PM
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Re: lowering the compression ratio?

Quote:
Originally Posted by Layson View Post
How much does this effect starting in colder climates?
That depends on how much compression you take out of it.

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post #10 of 39 (permalink) Old 01-21-2009, 12:14 AM
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Re: lowering the compression ratio?

Mine is 15:1, and with glowplugs, it starts up fine outside, but will chug the white smoke, for a very long time, and will blow white/blue for a minute or two going down the road under light throttle. I try to keep it in the heated garage and it likes it..

But if you don't wait for the glowplugs..


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