How much mag advance on Nitro Donovan?

What is the best/maximum amount of mag advance on a Nitro Donovan?
417 block at 392". Mastodon heads. Billet crank. 92% nitro. 8/71 standard blower. Cirello 8 amp mag. high gear only.
thanks, Dave.

 

anybody know the safe upper limit for mag advance?
Im currently running 40 degrees. never seen any serious heat in plugs. never hurt a bearing.
Must be some nostalgia nitro guys out there that can tell me how much advance can I go

 

Give Spud a call www.fuelinjectionenterprises.com

 

Talk to Danny Miller on here he can help you.Dave

 

Most of the late model hemi guys run around 60 degrees of timing, even up to 65. I don't think anyone runs under 50.

 

This one is an early style hemi. (392) with solid Mastodon heads. I understand the late model hemi can handle much more advance than the early hemi.
still seeking advice on max advance for early style hemi

 

Call Dave !

If you've got those heads, you must call Dave Dewars, he makes'em and fixes'em for the guys that found out what too much is.........

 

55 degrees and slow the blower to 10% over. You are in deep water, good luck

 

Advance

Dave
So you ran this FED on the weekend tell us How much timeing did you run ?
What did you run ?
Was it 6.3 ?

Regards
Dave Quick Draw McGaw

 

We have run as much as 58 degrees. Low fifty's would be fine.

 

I'll ask the four most important questions you didn't post. What od on the blower and what fuel pump/ output in GPM are you running, also how much does your car weigh , what rear end gear ---- etc etc

Make that 5 things , how far is the piston down in the hole ? CR ?

 

Don't listen to eagle1. His car doesn't run that hard.

 

We raced on the weekend. 6.93 at 223
91% nitro. 15% blower overdrive. 43 degrees mag. Enderle 1200 pump (18gpm) clutch was set soft. pulled 44mph in the top half.
followed up with 6.66 at 219 and 6.94 at 216. Burnt #2 plug on the last pass.
car weighs 1700lbs. 3.89 rear gears.

would increasing mag from 43 to 50 be too big a step?

Thanks for the advice

 

Typo. That was 6.63 at 223. Not 6.93

 

Mark, comp ratio is 6:1 pistons 250 thou down.

 

LOL Eagle1 won the March Meet so I'd listen to him.

Kind of a bit low on compression I think. I'm at 7.5 and think others are a bit higher
using an early hemi setup.

Bob