Proper compression?

L

LeviD

Free Member

Dec 12, 2012

163

18

18

Spokane, WA

• Feb 12, 2017

• #1

Could someone please tell me what compression numbers I should expect to see on these motors? Thank you

 

tuneman

Well-known member

Lifetime Membership

Jan 16, 2013

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Minnesota

www.everettsports.net

• Feb 12, 2017

• #2

120 psi, give or take a few with elevation. Consistency between them is most important.

 

S

SRXSRULE

Well-known member

Lifetime Membership

Aug 25, 2002

2,512

1,592

113

• Feb 12, 2017

• #3

Lower then you would think. my 12 and 14 both tested at 105psi @ 6200ft. Thats with a good quality gauge, both spark plugs removed, throttle held wide open and 5-6 strong pulls of the rope. Eric

 

L

LeviD

Free Member

Dec 12, 2012

163

18

18

Spokane, WA

• Feb 12, 2017

• #4

Thank you very much!

 

J

Jshlee3

Free Member

Jan 21, 2016

49

9

8

Dillon, CO

• Feb 12, 2017

• #5

I get 95ish at around 9,000'

 

tuneman

Well-known member

Lifetime Membership

Jan 16, 2013

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Minnesota

www.everettsports.net

• Feb 12, 2017

• #6

Here's an estimate per elevation:

0000 - 120
1000 - 117
2000 - 113
3000 - 110
4000 - 107
5000 - 103
6000 - 100
7000 - 97
8000 - 94

Roughly 3% loss per 1000ft