11.25 pistons added what’s the compression? - Road Glide Forums
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post #1 of 58 (permalink) Old 12-15-2017, 09:37 PM Thread Starter
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11.25 pistons added what’s the compression?

2016 RGU wet head bike with stock heads. Adding 11.25 to 1 pistons. Stock C.R. is 10.0-1. Will the C.R. be higher than 11.25-1?
Part number for the pistons is 27000007

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Last edited by freedom1974; 01-27-2018 at 07:42 PM.
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post #2 of 58 (permalink) Old 12-16-2017, 09:44 AM
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2016 RGU wet head bike with stock heads. Adding 10.5 to 1 pistons. Stock C.R. is 10.0-1. Will the C.R. be higher than 10.5-1 ?


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What pistons? Were they cut specifically for that head, if so, then 10.5:1. or there abouts

If they were cut for a larger chamber head, it will be more. And visa versa.

You can calculate it. You'll need the bore, the stroke, the chamber volume of the head, and the dome volume of the piston as well as the volume of the head gasket.


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post #3 of 58 (permalink) Old 12-17-2017, 02:30 PM Thread Starter
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They are Screaming Eagle 10.5-1 pistons. The bike has the stock wet heads on it and it’s a 103. I am worried about to much compression and blowing head gaskets. The HD dealer told me it will be ok but not sure I trust that statement.


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post #4 of 58 (permalink) Old 12-17-2017, 04:17 PM
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In this case dealer is correct.
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post #5 of 58 (permalink) Old 12-18-2017, 09:26 PM
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2016 RGU wet head bike with stock heads. Adding 10.5 to 1 pistons. Stock C.R. is 10.0-1. Will the C.R. be higher than 10.5-1 ?


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Do you know the CC of the piston dome?

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post #6 of 58 (permalink) Old 12-18-2017, 10:51 PM Thread Starter
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Do you know the CC of the piston dome?


They are the Screaming Eagle 10.5-1 pistons. Where would I get the information?


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post #7 of 58 (permalink) Old 12-19-2017, 09:34 AM
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Do you know what cam is in the bike? Cam timing can add or subtract from that compression
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post #8 of 58 (permalink) Old 12-21-2017, 07:13 AM
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How does cam timing effect compression? Not messing with you, I really want to know. Thank's

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post #9 of 58 (permalink) Old 12-21-2017, 07:35 AM Thread Starter
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Do you know what cam is in the bike? Cam timing can add or subtract from that compression


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post #10 of 58 (permalink) Old 12-21-2017, 07:36 AM Thread Starter
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How does cam timing effect compression? Not messing with you, I really want to know. Thank's

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Intake valve close I think is what affect the compression.


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