any benefit in advancing the timing on a pro engine

[mtnrider]

just wondering what the pros and cons are if you advange the time on the
cfi2 800. i ride at high elevation 9000 to 13000ft.

 

[Rocky]

Bat cave work I see!!!

Hope all is well Steve!

 

[Vertical Asshauler]

Wouldnt recommend advancing the timing. Reduces pipe temperature which = less power.

 

[mtnrider]

Interesting would have thought the opposite.

Bat cave work I see!!!
always looking for more you know what i mean!!!
hows it going?

 

[4Z]

Sends more heat into the motor (piston, cyl, head, coolant etc)

 

[poolaris]

i changed the timing in my assault

didnt see much of a difference!! wasnt worth the time and effort of changing it

keep it stock

 

[m8magicandmystery]

i changed the timing in my assault

didnt see much of a difference!! wasnt worth the time and effort of changing it

keep it stock

what if your running abit higher compression at lower elevations with 91 octane...is an advance timing key worth it or just mix in some higher octane..??

what is the best prevention for det..??

 

[dropitp*ssy]

You wouldn't want to advance the timing to prevent detonation, that would have the opposite effect, retarding the timing would counteract too high of compression or too low of octane.

 

[poolaris]

how much higher compression?? and whats elevation are you?


i ran a par head 12.5 with timing changed into it on sea level

and had no issues with DET


this year itll be run with a pipe added to it and pcv , leaning the sled down

 

[m8magicandmystery]

how much higher compression?? and whats elevation are you?


i ran a par head 12.5 with timing changed into it on sea level

and had no issues with DET


this year itll be run with a pipe added to it and pcv , leaning the sled down

13.5 to 1...2300-4000 ft...2.5 degree timing key advance...im wondering if i should get rid of the key.

 

[m8magicandmystery]

You wouldn't want to advance the timing to prevent detonation, that would have the opposite effect, retarding the timing would counteract too high of compression or too low of octane.

if im getting the spark to ignite abit before it usually does ...would the burn not be completed sooner after tdc and reducing the chance of det which is too much burn after tdc..??

 

[poolaris]

im running the same key in my sled at sea level with no issues

what mods are you running besides the high compression

 

[mtnrider]

With the 800 bb advancing the time work very good at elevation

 

[4Z]

800bb, been my experience that the more alt, the more timing they like. If you get it to rattle the plugs lose you have gone too far, will be too hot in mid range

 

[mtnrider]

4Z so you think that the pro eng. will lean out in the midrange. how about adding a fuel controller. will it make more power. or is it just a waste of time

 

[Rick!]

800bb, been my experience that the more alt, the more timing they like. If you get it to rattle the plugs lose you have gone too far, will be too hot in mid range

Exactly, to fix oil leak at plug bases, reduce timing, add more octane or enlarge stinger or exhaust outlet. Or wait until the cylinder pressure relief is self-installed into the piston.

 

[m8magicandmystery]

im running the same key in my sled at sea level with no issues

what mods are you running besides the high compression

ported 900 bigbore and bmp fatass pipe..etc..all in my sig line..

 

[sledstew]

13.5 to 1...2300-4000 ft...2.5 degree timing key advance...im wondering if i should get rid of the key.

Tested alot of these scenerios at low and high elevation with the Vi-pec (changed the timing all over the map) . I would reduce the timing to stock at low elevation and increase it above 6000ft elevation. Doing these steps will help you drastically especially up high.

 

[mtnrider]

Tested alot of these scenerios at low and high elevation with the Vi-pec (changed the timing all over the map) . I would reduce the timing to stock at low elevation and increase it above 6000ft elevation. Doing these steps will help you drastically especially up high.

was all this testing with 800 pro. how much advance worked best above 6000''

 

[Super Sled]

Exactly, to fix oil leak at plug bases, reduce timing, add more octane or enlarge stinger or exhaust outlet. Or wait until the cylinder pressure relief is self-installed into the piston.

This is how I've always thought about it too