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post #1 of 19 (permalink) Old 02-08-2013, 09:23 PM Thread Starter
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High compression pistons

Has anyone put in high compression pistons? and if so what was the result? please let me know

[FONT="Comic Sans MS"]2017 Road Glide Special 114,SE Hi flow intake, D&D M8 BILLET CAT 2:1, SE447 cam, TTS master tune
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post #2 of 19 (permalink) Old 02-08-2013, 11:31 PM
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I put in the 10.5:1 H-D pistons, along with other motor work. Very strong and definitely has more exhaust pressure. Definitely worth it!


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BW TC-44 cams; Fueling race lifters; SE Pro Tuner, ported/polished heads, 10.5 pistons, HV oil pump/camplate; RSD AC; Fullsac/Rinehart 4"
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post #3 of 19 (permalink) Old 02-09-2013, 02:48 AM
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10 1/2 to One on the CVO - HD also ~ This was the dealers demo and he stage III'd ~ there are some other tricks to bumpin compression up ~ Head Gasket for starters. I can only tell you that I am at 104/109tq ~ not sure of the stock cvo configuration....

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post #4 of 19 (permalink) Old 02-09-2013, 08:01 AM
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if you put in high compression pistons,the result will be higher compression.this will result in more HP/TQ,this can also result in alot of problems if compression isnt matched to a set of cams.best to have a good build worked up by a good builder.we can put together a couple proven builds together if you want
post #5 of 19 (permalink) Old 02-10-2013, 07:33 AM
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Originally Posted by chefskeeter View Post
Has anyone put in high compression pistons? and if so what was the result? please let me know

The intake closing number of your cam(s) will dictate the compression needs for the cam to be the most effective, in any given engine combination.
Feel free to give us a call, and we are happy to discuss this with you.
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post #6 of 19 (permalink) Old 02-13-2013, 11:28 AM
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Originally Posted by mitchdm View Post
10 1/2 to One on the CVO - HD also ~ This was the dealers demo and he stage III'd ~ there are some other tricks to bumpin compression up ~ Head Gasket for starters. I can only tell you that I am at 104/109tq ~ not sure of the stock cvo configuration....
Mitchdm,

Typically the stock 110 makes 80-90 hp stock, and 90-100 torque. I would have expected a tiny bit more torque from your build though roughly looking at 115, but might just be a stingy dyno.

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post #7 of 19 (permalink) Old 02-14-2013, 06:20 AM
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A Wood 777 set at 10.4-5, will blow off 115/125 in a 110", as Lone Wolf Perf,tned one with a set of our Stage II CVO Heads/777/Fulsac exhaust combo.
Doc just tuned STGHost's 107"er to just a tick less.
We stay away from the WILD compression, as gas is not getting any better.
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post #8 of 19 (permalink) Old 02-14-2013, 08:07 AM
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The stage III was done by the dealer before I purchased the Skunk ~ Current Output is 104/109tq. Specs are in my signature. Bike is strong but I'm going to change cams to 777's and having a set of 110 heads reworked for better results.

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post #9 of 19 (permalink) Old 02-14-2013, 08:55 AM
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The stage III was done by the dealer before I purchased the Skunk ~ Current Output is 104/109tq. Specs are in my signature. Bike is strong but I'm going to change cams to 777's and having a set of 110 heads reworked for better results.
Mitch are you running the 255 cams? That thing ought to be close to 120 tq,I suggest getting a good tune..JMO

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post #10 of 19 (permalink) Old 02-16-2013, 10:28 AM Thread Starter
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Thanks Scott for your time on the phone big help.

[FONT="Comic Sans MS"]2017 Road Glide Special 114,SE Hi flow intake, D&D M8 BILLET CAT 2:1, SE447 cam, TTS master tune
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