pro compression

[t 800]

i tried a search and could not find what i was looking for, does anyone know what the compression on the new pros should be?

 

[t 800]

anybody??????

 

[die hard poo]

I did a comp check on both my 10 D8 and my Pro a little while ago and I think it was 125#...

 

[t 800]

did you test it warm or cold or will it matter

 

[die hard poo]

Sorry, Cold, at sea level

 

[IQRIDR]

Same here, 125 cold at sea level. Should be the same as the '10 d8's, the only difference in the motor hardware is the cylinder.

 

[theshadowrider]

I checked my 08 dragon with the 2010 update with 200 miles on the update and 92 a side at 5,000 '

 

[Rich07Dragon700]

A few weeks back I checked two 800 Rush engines, cold engine, 1500' elevation Wis, used a SLP gage & and a good old small engine compression gage.
---One 800 Rush was at 115 psi both cylinders, with 2 miles.
---The other Rush was 105 psi both cylinders at 10 miles, at 200 miles both cylinders were 120 psi.
Safe sledding; Rich

 

[1Mike900]

Boy there is a lot of power left in this thing with a new head and tuned pipe just for starters!!

 

[milehighassassin]

State the miles on the motor and the elevation the test was performed at.

 

[1200psi]

Boy there is a lot of power left in this thing with a new head and tuned pipe just for starters!!

Yes there is i make some state of art heads for these sleds i have 12.5 13.5 and 14.5 heads for different altitudes and styles of fuels. These motors really come alive with 13.6 heads still run on pump fuel from 6-10 k and 12.5 from 0-5500 pm me if you are interested.

Brad

 

[IQRIDR]

I can attest to Brad's heads making great power on the Pros..

 

[wyodoo]

Compression

WOW
120 Lbs is pretty low. No wonder they are down on HP. My 08 XP was 145 at 5000 Ft.
I wonder why they went that low? Was that to cure the burn down problems?
I just bought a Pro RMK and first ride impression was it was very soft on power.
Why would they need to Run premium gas with that kind of compression?

 

[IQRIDR]

Static compression is not the only factor when deciding fuel requirements. Port timing, ignition timing, dome design all play major factors.

Judging from the piston wash on a couple Pro's I have looked at, this motor is running relatively lean to meet the EPA requirements. This plays a factor I am sure, as far as the low compression is concerned.

 

[2XM3]

WOW
120 Lbs is pretty low. No wonder they are down on HP. My 08 XP was 145 at 5000 Ft.
I wonder why they went that low? Was that to cure the burn down problems?
I just bought a Pro RMK and first ride impression was it was very soft on power.
Why would they need to Run premium gas with that kind of compression?

Cranking compression has NOTHING to do with running compression and octane requirements...just do a compression check on a pro stock motor, pumps around 90, and its 16-1 actual.

 

[t 800]

mine was 105 at 7000' on a cold motor i felt that this was low based on previous sleds i have had.

 

[SNOWMANN]

2011 Pro RMK 800, cold motor, open throttle, 1000ft, 125 psi

 

[milehighassassin]

2011 Pro RMK 800, cold motor, open throttle, 1000ft, 125 psi

How many miles on the motor?


Sent from my iPhone using Tapatalk

 

[SNOWMANN]

300

 

[4Z]

clicky