any smart small engine/atv engine guys here?
10-05-2015, 09:51 PM
#1
any smart small engine/atv engine guys here?
I have a question about the 800CC engine on my 2012 RZR.
the internet says my compression pressure should be between 165&185. Mine checked out at 130psi on each hole which prompted me to do a leak down test. leak down on both cylinders is between 4&5% which is in the green zone. the gauges I was using only showed around 35-40 psi to get the leak down gauge to zero...I expected it to be around 100psi but if the gauges are made to work together...I guess so.
soooooo WTF? low compression test but perfect leak down? the valves are not adjustable on this motor. do I just say screw what the internet says and trust the leak down results, or should I be worried about the low compression pressure?
the internet says my compression pressure should be between 165&185. Mine checked out at 130psi on each hole which prompted me to do a leak down test. leak down on both cylinders is between 4&5% which is in the green zone. the gauges I was using only showed around 35-40 psi to get the leak down gauge to zero...I expected it to be around 100psi but if the gauges are made to work together...I guess so.
soooooo WTF? low compression test but perfect leak down? the valves are not adjustable on this motor. do I just say screw what the internet says and trust the leak down results, or should I be worried about the low compression pressure?
10-06-2015, 12:58 PM
#5
When you did the leak down test was the piston at the bottom of the cylinder? If you compressed it with air, the air would rotate the piston down unless you had it at TDC. TDC is where a cylinder wears the most, so rotate the engine to TDC and do a leak down test there.
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10-06-2015, 08:15 PM
#8
they are about as identical as they can be on both compression and leak down. for those that don't know, my machine spent around 30 minutes 20' deep in the san jac river a little more than a week ago. engine cut before water made it to the cylinder.
