Anyone get stuck having to run this gas yet? Just wondering how things went. a bit worried with the long extended runs with this type grade of fuel. ANyone have any luck with any type of octane boost???
87 Octane
- Thread starter HCRRider
- Start date
Never had any problem in any of our sleds that didn't have heads on them.
The stock M's (010 M8 aside) run better with the lower octane fuel. Up here we run 85. 10k+ feet
The difference between 85 & 91 is noticeable. (with 85 being better)
The stock M's (010 M8 aside) run better with the lower octane fuel. Up here we run 85. 10k+ feet
The difference between 85 & 91 is noticeable. (with 85 being better)
I would never run higher than 87 in my m1. If you're talking about a 2010 M8 run the premium like they say to. Sticking with what cat recommends is safest.
These guys are correct you can run 87 in anything except the race sleds prior to the 2010 800 which will require the premium
Hope this helps Jeff.
Hope this helps Jeff.
i don't mean to hijack the thread, but i've been running 91 in my M7 for a while (used to running it in my previous sleds), and was thinking about trying 87 this year, but i just put on a D&D single & can. so, i'm wondering if it would be better to keep running 91 with this setup, or would it be better to make the switch to 87? any advice would be greatly appreciated. thanks! 
I've had to run 87. (Actually 88) as low as 5,000 feet before and didn't blow up on a 20-25 mile ride. The sled is an '05 M7 with an RKT 14:1 head. I just kept waiting for it to do something terrible...but after the ride I took the head off and no signs of deto at all...so I think 87 should be fine most anywhere for an older stock sled.
Sorry guys, I didnt explain myself..I was talking about the new 800 motor. I have a new HCR and am going to have to run 87 Octane for an extended period of time. I know the timing will retard if it gets down on the knock sensor and the Rpm;s will go down some to help save the motor and prevent a burndown. With EFI there must be a remapping that can be done to detune the sled????
Depends on your alt. Why do you have to run 87 as opposed to 91/93.
Drop the compression!
HCRRIDER, If I remember, you are running a cross country race in deep snow terrain.
The 2010 motor is running 13.5:1 compression. Pretty high for 87 octane fuel.
If it does not effect your rules for racing, I would recommend calling Kelsey at RK-Tek and getting one of his heads set it up for a little lower compression ratio. With the added cooling and a slight drop in comp, you should be able to run the 87 all day long with no issues.
If a head change is not an option, you may be able to have the combustion chamber of the head cut, or go with a thicker base gasket for your cylinders.
The thicker base gasket will lower the compression, but will also change the port timing a little. On the 09's it ran better with port timing change, not sure about the 10's. Again, Kelsey may have some inside knowledge from testing.
D&D may also have some input if you prefer to deal on the East Coast.
Good Luck and Ride Safe!
HCRRIDER, If I remember, you are running a cross country race in deep snow terrain.
The 2010 motor is running 13.5:1 compression. Pretty high for 87 octane fuel.
If it does not effect your rules for racing, I would recommend calling Kelsey at RK-Tek and getting one of his heads set it up for a little lower compression ratio. With the added cooling and a slight drop in comp, you should be able to run the 87 all day long with no issues.
If a head change is not an option, you may be able to have the combustion chamber of the head cut, or go with a thicker base gasket for your cylinders.
The thicker base gasket will lower the compression, but will also change the port timing a little. On the 09's it ran better with port timing change, not sure about the 10's. Again, Kelsey may have some inside knowledge from testing.
D&D may also have some input if you prefer to deal on the East Coast.
Good Luck and Ride Safe!
Yes, that would be me. Hey thanks for the post, and I will contact him to talk about that. Much appreciated.
Just run a 09 head, its stock right.
