Topic: TIMING??

[SLIVER]

Hey guys, I just got done building a 22re. I put the engine builder crawler cam in it (.261 I think) bored .20 over. I am a novice at all of this and so I thought I'd ask you guys. What do you set the timing at. My chilton said advance it 5 degrees, so that's what I did for now. I have heard with the bigger cam you need to set the timing different.
What do you guys think that I should set it at???

I haven't driven the truck much since the engine swap, however it seem to run smooth right now. Just wondering if you guys think that I should change it or leave it where it is.

Thanks a ton.

))--SLIVER-->

[emsvitil]

I time my stock-cammed 22re at 8 degrees........

[Duffil]

5 is stock. more advance is more power, less fuel economy, and possibly pinging. I loved running about 12*-15* but I couldn't run it all the time. 8* made more power than stock and was still happy with regular fuel.

edit:grammatical error

[79coyotefrg]

time the cam straight up, ie  on the mark

distributor timing is 5 degrees with t1 and e terminals crossed,

[SLIVER [OP]]

time the cam straight up, ie  on the mark

distributor timing is 5 degrees with t1 and e terminals crossed,

I timed the cam to the mark, and set the timing at 5 deg. with the terminal jumpped. Glen do you think I should advance the timing?? The guys above said around 8 deg will give me more power with this cam. What do you think? Should I leave it where it is or advance it??
Thanks.

))--SLIVER-->

[blackdiamond]

5 is stock. more advance is more power, less fuel economy, and possibly pinging. I loved running about 12*-15* but I couldn't run it all the time. 8* made more power than stock and was still happy with regular fuel.

I thought that advancing the timing effectively leaned out the fuel mixture and resulted in better fuel economy? 

My 4Runner has a mild cam and likes premium fuel even with the timing in the 5-8 degree range.

[79coyotefrg]

I timed the cam to the mark, and set the timing at 5 deg. with the terminal jumped. Glen do you think I should advance the timing?? The guys above said around 8 deg will give me more power with this cam. What do you think? Should I leave it where it is or advance it??
Thanks.

))--SLIVER-->

play it by ear and see what results you get,  8* on your truck might not work as well as another truck does on 5*  or even 12*

22RE and 22R's are very different,  i have mine at 12* then add the vacuum advance and centrifugal  i have about 34* total

[83MT]

Wow! I'm going to advance my timing a bit and see what that does for my fuel economy. I'm at around 6*, and I'm up around 5,000 ft so I think advancing it a bit may help. We'll see.

[SLIVER [OP]]

Cool, thanks Glen.

))--SLIVER-->

[Duffil]

I thought that advancing the timing effectively leaned out the fuel mixture and resulted in better fuel economy? 

My 4Runner has a mild cam and likes premium fuel even with the timing in the 5-8 degree range.

on my truck, i get less mileage when I advance it.

[blackdiamond]

on my truck, i get less mileage when I advance it.

http://www.rodandcustommagazine.com/techarticles/0604rc_ignition_timing/index.html

According to this economy is linked to a lean fuel mixture and not directly to timing.  It also states that a rich fuel mixture will develop maximum power with less advance than a lean fuel mixture will.  It's all a balance and the optimal timing is determined by the fuel mixture.

[peacesells]

Timing on my 85 efi is around 20(w/jumper) with no pinging at 7000ft on 89 octane 15-30 degree air temp, 16(w/jumper) at 1500ft and 87octane 40-65 air temp is nice and peppy. 5 runs ok at idle, but has no power... 18-20 at 1500ft misses at idle. my 84 carb pings like a mofo after 10 on 87 octane at 1500ft

[peacesells]

and by the way, more advanced timing = more efficiency meaning more power per unit of fuel = better power per unit of fuel used(unchanged by initioal timing). you want to run the maximum amount of timing possible with no pinging whatsoever, unless you live at a high elevation and drive the truck at a lower elevation occasionally, then leave it dialed back (retarded a little). I go about 1/2 degree per 1000ft elevation. remeber, air at lower elevations is denser, more atomospheric pressure..