msd44 and old brad fuel heads timing

I was told that with a msd44 you should not run over 26-27deg timing. I ran 37-39 with a mallory 3, at 26 with the msd it would not even start and run, until I put 35 deg. Any ideas on this?

 

i ran a combo like that and in bad air your fine at 35 degrees. under 1000 feet corected alt. pull it back to 32. the chambers are to big to run timing in the 20's.

 

This is from MSD's site, you might have to update your box. It should start with less timing. http://www.msdpromag.com/nuepb.htm

[ June 03, 2004, 03:52 PM: Message edited by: Sportsman ]

 

Thanks for all the replys! Will thats exactly what it sounded like. Seems like alot of the benefit of the 44 is lost without being able to retard the timing. Thanks all

 

in doesn't have anything to do with the mag. alcohol needs heat to ignite and burn. if it is below 75 degrees weather temp we mix gasoline 50-50 with alcohol to start the car. if all the aluminum is cold alcohol won't light. on top of that you take a 180 cc head and a large dome piston you need timing to achieve the needed flame travel.a bae fathead has less than half the cc's than a fuel head and this is why people with brad stuff (fat head only) can run 26 degrees. if they put 35 degrees in a fat head you could call it a no heads after one run. i hope this helps. sometime when you tell someone you run bae heads they automaticly think fathead

 

nothing like timing in blown motor, crank it up ,LOLOL

 

Lets hear from some veney head users as far as timing goes . I think the veney alky heads have a larger chamber than the bae fuel heads . I know of 2 veney head ihra cars that use only 26-30 with the mag 44's .

 

DQUES the original guy that told me to run 25-26 deg thats the lead he runs with Veney heads.

 

Was wondering if anyone has measured their intkae temp and pressure with wet blown alky, and can relate those numbers versus compression ratio and spark lead with alky?

Every combo has its own sweet spot, for sure. Is the BAE fat head really 180cc or is that a typo above?

 

I asked Ron Armstrong about monitoring manifold temp on a roots deal about 3-4 years ago and was told no. I wasn't looking for an accurate number-just a comparison number and told him so. Now they monitor screw blower manifold today, Go figure.

Fat head 3=128cc
Fat head 5=98cc

What chamber were the 4s?

180cc must be the fuel head.

 

we ran 35 degrees with veney heads in all air conditions,with mag 12. ran low 80s at over 240!

 

Thanks TH. Okay, so now that some folks are monitoring such things, what would typical manifold boost and temp be for roots or screw? Also, what are typical C/R's these days? Don't need specific #'s, just ball park.

 

40 psi w/ Kobelco will raise ambient about 40 degrees.

 

40 centigrade (C) I presume?.....

 

We monitor the temp. with a 2" probe in the back of manifold. If the air temp is 80 deg. f. at start, will be 120-125 f. at finish. Temp will be somewhat higher with SSI, they make a bit more boost, but raise temp. because of more internal friction.

14/71 Kobelco helix at 25% on P/M.

 

Wow. That's not a bad delta T at all!. Roughly, what's your fuel split upper/versus ports? The LHEV of meth sure is a good friend to have.....