Opinions on exh deflectors

[Bently]

Guys,

I'm having some bog issues since installing an SLP pipe, can combo. The SLP can reaches farther out the sidepanel opening. What brand/style of deflectors have you guys used and did you like.

Thanks for the advice and pray for snow,
Bently

 

[Bently]

Sorry, I have a 2009 M8.

 

[ACMtnCat]

I don't think a deflector is going to do anything for your bog.

What air intake are you running. Stock?

 

[Bently]

I have a BDX intake. What makes ya think a deflector wont help my bog? looking forward to your thoughts, thanks!

 

[Vern]

I ran a deflector for years on my m7, simply took a piece of aluminum I had and bent it to the contour of the stock deflector and riveted it on. Extended it about 1-1.5". Between that and my slightly modified stock intake plenum I never had any bogs. Sled also had an slp can

 

[ACMtnCat]

I ran a deflector for years on my m7, simply took a piece of aluminum I had and bent it to the contour of the stock deflector and riveted it on. Extended it about 1-1.5". Between that and my slightly modified stock intake plenum I never had any bogs. Sled also had an slp can

Bingo! Stock intake works best. BDX intake created a bog on multiple sleds for me. Went back to stock intake and bog went away.

 

[ACMtnCat]

I have a BDX intake. What makes ya think a deflector wont help my bog? looking forward to your thoughts, thanks!

You say the SLP tip sticks out farther. Why would a longer deflector help? That would make the exhaust more likely to go back into the engine compartment. Right?

If you want a longer deflector, just cut the tip off the can.

 

[sledhead685]

I had the exact problem on my 09 M8 after installing an SLP kit this fall. I built a deflector extension like Vern describes out of a piece of scrap aluminum. Hasn't bogged since, but I also haven't been in as deep of snow as that first day again yet. I could snap a pic of it later if you'd like.

 

[MI1M600EFI]

I also have an '09 M8, and I sometimes run a SLP can on it. And I sometimes get a low end bog, particularly after doing a longer climb, or higher throttle. In my case, it's not the can, even though it more or less started after I added the can.

It's a combination of belt deflection, clutch condition, and oil pump sticking. Belt deflection needs constant adjustment. If the belt isn't sticking out of the driven clutch more than 1/16", I get the bog. If the motor mounts are starting to deflect to the rear, that'll add deflection and also contribute to the bog.

The bog itself is made worse by the oil pump sticking, or retracting very slowly after you're high in the throttle. I recommend you do the O-ring fix, and clean and lube the return spring.

Finally, these sleds seem to eat clutches, particularly if climbing a lot. Make sure your clutches are in good condition. A weak primary spring will let the engine engage too low in the RPM range. Worn weights (caused by worn rollers) will make the clutch hang up and that'll bog it out too.

Check and correct all of the above and I'm betting your bog will go away.

That's been my experience, anyway, with the same sled. Feel free to try the exhaust deflector, but I don't think it'll make a difference, since putting on my stock muffler didn't get rid of my bog.

 

[Bently]

Understood. Tell me more about the o-ring fix for the oil pump. Or is there a thread here I can check out? Thank you.

 

[MI1M600EFI]

Understood. Tell me more about the o-ring fix for the oil pump. Or is there a thread here I can check out? Thank you.

There are threads here... I did some quick searching, but didn't find any threads with good pictures. Google M8 oil pump sticking fix and go from there... Basically, you use two small o-rings to tie the two levers of the oil pump together, which forces them to follow throttle, instead of letting the lever that changes oil delivery to hang high. I think most do it through the belly pan.

A zip tie might also work. Or whatever you can manage.
Chris

 

[Coldfinger]

I have the slp can. My feeling is that it bogs less than the stock can because the opening is smaller and thus has more exhaust exit force and less likely to plug with snow.

Regarding a longer deflector - that seemed to help but what i noticed one day whensled was on its side was the deflector had directed the exhaust further down before it was free to exit and it melted the underside of that panel. I couldnt believe it.

I believe the oem skis on my 2010 throw snow right toward the exhaust exit and contributes to the bog. I wish i would have thought of that one day when a buddy was on a 2009 with tunnel skis and he wasnt having a bog issue that day when the powder was over the windshield.

Lastly, i once strapped a few chunks of open cell foam over the intakes and felt like that helped too by creating a larger surface area for intake. I have since drilled a few holes in the top of my airbox and covered them with open cell foam figuring if the side intakes get covered in snow at least the engine can continue to breath to some degree.

 

[Vern]

I did similar to the intake on my m7, drilled a bunch of holes in the top of the section of the plenum between the two stock intake vents and covered them in prefilter. I also replaced the stock plastic framed intake prefilters with stick on frogskins. The plastic frame seem to help hold snow which would build up and block the intake off. Between these and the exhaust deflector, my m7 was bog free.