Are you hitting on her, trying to get laid? Good question.... Ya what ever, people have been asking about the single ring pistons since Doo started using them. The 1 ring doesn't cause a motor to go lean. People are still asking stupid questions about the failures. No it's not single rings causing the failures. Nor is it just from bad gas, or ethanol, or piston clearance,or oil, or just a midrange issue. There are stator failures causing burndowns, voltage regulaters causing burndowns, and a fuel pump assembly causing burndowns. There are multiple reasons for the burndowns. If it was that simple, Polaris would have had it handled last year, and I won't believe they have it totally handled until I can put 3,000 miles on my sled w/ a failure. At the current rate, that would be another 8 pistons.
Call me a hard *** all you want, I don't give 2 ****s. Your opinion doesn't mean jack.
BTW we're still riding so have a good summer yourself.
Skibreeze you appear to be very sharp person, but a little short to a few folks.
I do have to say you do know two stroke engines, especially the many problems with the 08 & 09 D8's.
You had listed most of the D8's CFI issues, design and Q.C..
I think that the biggest problem with the CFI 4 injector system is that low to mid rpm injector in the cylinder boost port does not cool the piston and crankcase with fuel. Then hotter engine, heat soaked faster, loose HP and can burn down easier.
The other big problem with the Polaris CFI 4 system is poor quality control of CFI components. Also lack of quality control on installation, especially the TPS setting and oil injection pump set-ups!
My 09 600 CFI 4 Switchback had the TPS voltage set too high, caused a lean bog, poor low end performance engine, back-fired through muffler in warm conditions. Also the PTO side runs a little rich, MAG side is very lean, injector flow varies a lot, lucky engine did not burn down!
The main reason I like the new CFI 2 injector system is that the fuel is injected into the crankcase, cools the crankcase and pistons much better then Poo's and Doo's old SDI 4 injector system that inject fuel above the piston, less crankcase and piston cooling. Then more burn downs, less HP due to heat soaked engines.
Has Polaris tested a 800cc CFI 2 injector system to reduce piston heat????
Last spring Polaris asked the
top mod engine builder to analyze the 800 CFI, suggest improvements. he declined because they just wanted more free advice, no $, also he does not like the
800 CFI big twin on a small block crankcase.
Very hard to make a silk purse out of a sows ear.
He did state last summer that the D8's exhaust port was too square, hard on hot single ring pistons. Also the big hot exhaust valve blocked coolant flow on the exhaust side of cylinder.
I think I will take Meathead's suggestion, plug the exhaust valve hoses to solenoid to allow exhaust valves to open sooner, cooler piston and improved performance. I can feel a very large power surge at 7000 rpm, from the SLP pipe on my 600 S.B. or power valves opening too late?
I have not asked any of my very good sources to confirm, but Polaris with Mer's Orbital will/must have all of the 08 & 09 D8's problems fixed!!!
If Poo has a 2011
800 "CFI 2" engine in a 136" Switchback, it will be my next sled!!!
Good luck, Poo CFI 4 folks; Rich
