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Old 03-13-2010, 09:27 AM   #1
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Hey!

I'm going to be using 20% in my reddot engine. It comes 0.60 shimmed default. should I just leave it as is and run the 20%?
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Old 03-13-2010, 09:37 PM   #2
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Hey!

I'm going to be using 20% in my reddot engine. It comes 0.60 shimmed default. should I just leave it as is and run the 20%?
You can leave it the way it is, but you will not make as much power. Supposedly the Reddot motors come pre-shimmed for 30%. So if you take a .10 shim out you will bring the compression back.


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Old 03-15-2010, 06:34 AM   #3
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okay thanks
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Old 03-18-2010, 11:07 PM   #4
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Is the topic about the OFNA JL red dot .12?

I have three shims on mine as well and will be running 20%.

Should I remove one shim during the break in process or after?

Last edited by DK9mm; 03-18-2010 at 11:29 PM.
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Old 03-19-2010, 06:05 PM   #5
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Is the topic about the OFNA JL red dot .12?

I have three shims on mine as well and will be running 20%.

Should I remove one shim during the break in process or after?
I broke in my own with 20% leaving the default shims on. didn't see anything wrong, you would lose compression though if you run with 20% as Shawn said.
I don't know what mm shims to use for 20% though. I've been running the engine for about 3 months now and changed the con rod a few weeks back and i'm still using 20% with the default shims.
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Old 03-19-2010, 10:54 PM   #6
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the three shims are the ones that came with the engine.

Should I remove one now to increase compression?
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Old 03-20-2010, 09:46 AM   #7
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yes u want the right shims no matter what there should be a .1 and a .2mm remove the .1 mm shim and u should be good although i ran my tuned on 20% and it did just fine without removing any shims i just had to lean it out a bit but better to have the right clearance
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