Hey Dan can you explain why some engines last longer than others.Some of the pros are going 4000 miles no problem then others with less than 1000 miles are losing skirts.Operator error or just the luck of the draw?
By using a longer rod that moves the piston higher up the cylinder wall so there is less stress on the skirt is that correct? Than you add a spacer to raise the cylinder that decreases the rod angle. Why wouldn't polaris do this it seems simple enough.
If I decide to use your kit can I run my PA head and still get the warranty?
Great questions.
Its not all luck. As for motors with low mileage failure, and some motors that go thousands & thousands of miles with no problems.
I saw the same thing on the 800 Big Blocks, But the problems were completely different & less complex on the old motor.
The new motor has completely different set of problems.
#1 - We talked about the rod ratio already.
#2 - * ( This one is complex and dangerous to talk about ) *
The Arctic Suzuki motors have been talked about and their poor rod ratios and why some of them last so long. As anger800 mentioned..... Suzuki has always been able to make really good motors on the edge of perfromance & design strength. The Polaris small block has to things working against it as far has sleeve extensions breaking.
A - The small block likes to rev and likes to get into a area where one might tend to thing things are starting to resonate.
B - Engine mounting I.E. very ridge chassis.
Back in the days of the 800 XCR triple you could run those motors for thousands of miles with no problems...... Then change the motor mounts to the harder durometer and the front of the cylinders started to break.
By adding the corner sleeve supports to the cylinder 2 things have been accomplished.
1 - sleeve strength increased.
2- the overal radial length of the sleeve has been increased & resonant frequency has moved reducing stress on the sleeve.
Its not just rod ratio that causes the the sleeves to break.
And yes the warranty is Good with the Power Addiction Head.
Dan