Magnum cooling

[Evan Dutch]

I’ve got an update:


Took the car out to the local cruise in tonight. I made some adjustments to the portion of the timing table where the car cruises at:

Headed to the cruise in:

55mph
2500rpm
29 degrees of timing

Coolant temp reached 200 degrees and stayed within a few degrees of that.

Brought my laptop with me so I made a few more adjustments before I headed home. Results as follows:


55mph
2500rpm
36 degrees of timing

Coolant temp reached 172 degrees and stayed around there.

Cruising at 55mph. 2500rpm and -5psi had it at almost 36 degrees. Car didn’t get over 172 coolant temp while constantly cruising. Now when I stopped and such yeah it would warm up.

Cruises with noticeably less effort.

What do you guys think? Should I give it more timing?

 

[Valman]

Yes! I know your engine has a S/C, but an NA engine would have 40 degrees plus at those cruising conditions.
Inch up slowly..

 

[MopaR&D]

I’ve got an update:


Took the car out to the local cruise in tonight. I made some adjustments to the portion of the timing table where the car cruises at:

Headed to the cruise in:

55mph
2500rpm
29 degrees of timing

Coolant temp reached 200 degrees and stayed within a few degrees of that.

Brought my laptop with me so I made a few more adjustments before I headed home. Results as follows:


55mph
2500rpm
36 degrees of timing

Coolant temp reached 172 degrees and stayed around there.

Cruising at 55mph. 2500rpm and -5psi had it at almost 36 degrees. Car didn’t get over 172 coolant temp while constantly cruising. Now when I stopped and such yeah it would warm up.

Cruises with noticeably less effort.

What do you guys think? Should I give it more timing?

Now you're on the right track. Yeah give it more, keep going until you get a light surge at cruise or pinging going up a hill then back it off a couple degrees. Don't worry you won't blow it up if it pings a tad under light load. I'd be surprised if it doesn't end up with 45+ degrees advance at cruise.

Also I don't remember what you said initial timing was but if it's below about 14 then give it some more at idle, that'll also help keep it cool when sitting at lights or in traffic.

 

[MopaR&D]

Example, my Buick has a 3800 V6 with a factory supercharger. I modified the timing tables so it has close to 40° at cruise but once the boost comes in it drops down significantly, WOT it's only about 17°. Picked up a noticeable amount of power and MPG compared to stock and it still doesn't get much into knock retard (has knock sensors that retard timing when pinging is sensed). Being a smaller-bore engine than a 5.9L V8 it doesn't need as much advance to get a complete burn.

 

[Evan Dutch]

Now you're on the right track. Yeah give it more, keep going until you get a light surge at cruise or pinging going up a hill then back it off a couple degrees. Don't worry you won't blow it up if it pings a tad under light load. I'd be surprised if it doesn't end up with 45+ degrees advance at cruise.

Also I don't remember what you said initial timing was but if it's below about 14 then give it some more at idle, that'll also help keep it cool when sitting at lights or in traffic.

My idle timing is 20 degrees