8.5:1 Pistons!?!?
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Joined: 03-14-06
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From: soon to banned as I am from MANITOBA?
He went with the stock 9.5:1 for drivability. If the M62 doesn't meet his efficiency/power requirements the next step is to save for a different SC.
What are your plans for the engine? You need to plan well in advance with this motor. There are a few different routes to take to building the internals, some routes are easier and cheaper than others. Blown 4-banger can attest to that.
What are your plans for the engine? You need to plan well in advance with this motor. There are a few different routes to take to building the internals, some routes are easier and cheaper than others. Blown 4-banger can attest to that.
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Joined: 10-08-05
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From: AZ
In general, if you are going high boost you should lower the compression period. The only reason you would raise the compression is if you didn't want to run as much boost for the same amount of power. If you plan on upgrading the blower or converting to turbo, lower the compression. If you want to keep the M62 but get more power, raise the compression and keep the boost lower where the M62 is more efficient.
You also have to consider what fuel you plan to use and how available it is in your area. In Arizona there are only 2 gas stations that we know of that sell anything over 91.
You also have to consider what fuel you plan to use and how available it is in your area. In Arizona there are only 2 gas stations that we know of that sell anything over 91.
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Joined: 04-03-06
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From: Mesa, AZ
First off. DAYUM!!!! Necro-posting FTL!?!?!
Also, I went with 9.5:1 pistons, because I got used to tuning with 9.5:1 compression, and just as Cobalt_Supercharged said, in AZ the best we have is 91 ****ane, not to mention the 130+ degree IAT1 4 months out of the year. I ran 15 degrees of timing DURING THE WINTER on 91 octane, and still had some minor issues with knock at higher speeds. The motor blew up before summer, so I can't imagine it during the summer. So basically, 10:1 compression would mean running a mix of 91 and race gas all the time. **** THAT!!!
Also, I went with 9.5:1 pistons, because I got used to tuning with 9.5:1 compression, and just as Cobalt_Supercharged said, in AZ the best we have is 91 ****ane, not to mention the 130+ degree IAT1 4 months out of the year. I ran 15 degrees of timing DURING THE WINTER on 91 octane, and still had some minor issues with knock at higher speeds. The motor blew up before summer, so I can't imagine it during the summer. So basically, 10:1 compression would mean running a mix of 91 and race gas all the time. **** THAT!!!
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Turbo Johnny
2.0L LNF Performance Tech
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Feb 21, 2019 09:41 AM