Speed H2O

Great info guy's.....timing starts at 36 degrees..got me confused though.....? Please keep the info comming!!!

BOSSMAN

Yes, it is based on 1.5. I use 36 at Idle it loves timing. It makes it very nice at idle. at 3200 it starts to really give the boost. I have 250 blowers with twin 750 carbs. I also run 93 gas. I also have msd distributors.

Rich

RLW

Bossman,
This is very interesting as I am trying to optimize my engine performance at the lower rpm's.
My engine: 496" Stroker, B&M 250 with 1050 Dominator worked over by Nickerson to a 1170 cfm rating, Superchiller and
MSD 6BTM box and distributor.
Where did you get your information for your timing specs?
Are your carbs "Boost Referenced"?
What displacement are your motors?
Thanks Again, Russ

BOSSMAN

I have 509 motors started as 502-500HPs. The carbs are not boost ref. The msd control works of boost. I burn't up 4 motors playing with v6 boxes and no inner coolers. I put msd, inner coolers, changed boost up from 5 to 8 lbs. Played with the base timing to give me 28 at 5000 rpm this worked out to 1.5 just like you said. What I had before which was 32 degree at 5300 before the changes. Being able to dial in with this msd control is great, I wanted 30 or less total and got it. Before I had to play with the carbs to get it to idle good. A friend who is great with carbs took the boat out and ran it hard, stopped, checked plugs, check again and again. He changed the carb settings front and back about 20 times. ran it fat then keep changing sizes til it started to get lean then went back up. I now have over 50 hours on them set this way and not one problem. Clean plugs, clean stern and smoooooth idle. I know I have a lot more power left but I'm chicken, after 4 motors up in smoke I now have something that is turn key, it's now FUN. I had 28 bravo props after changes went to 30 that is with 1:36 gears, bravo x drives. Had one motor on dyno BEFORE CHANGES at crocketts. Got 654hp at 5200. Didn't get it done after changes but they had to make it gain even more.

Rich

Speed H2O

Bossman, what is your static comperssion ratio, and what model MSD controller(part number please) do you have. Were your Engines Mercury factory HP500 Blue engines before the Mods?
Sounds like I might be going your way
Mikey

BOSSMAN

The msd ignition I have is msd 6 btm. It comes with the box, wire harness, retard controler. I had stock merc 500hp motors to start.
I only changed the heads to merlin. I sucked valves in with the stock heads, 3 times. The merlin iron heads have been great no problems of any kind, also changed the springs. I played with carbs, plugs, v8, v6 boxes everything that was going to make it run with a blower and if it could go wrong it did. When I put them together this last time and went complete msd ignition and had my friend set the carbs I now have something. Hope this helps you.

Rich

Speed H2O

BOSSMAN,
do you feel that the stock heads are not going to work then with my set-up, running a max boost of 5PSI. Why do you think you sucked 3 valves??

US1 Fountain

My 'stock' HP motor has over 350 hrs with max of 5* boost using the T-Bolt ign w/V6 module and boost referenced 1050 dom. No problems. I tried the V8 module because of the V6 timing curve near idle. Made no idle difference on mine.

BOSSMAN

h2o, I think the real problem in my case was running 32 and 34 degree timing that did them in. This was with no inner coolers. I found that the inner coolers was the best thing I did. I was running hard before and would have hi oil temp and water not now and that is with higher boost, but lower timing. Also my motors idle at 850.

Rich

Speed H2O

BOSSMAN & US1 Fountain, Thank's again! This info is invaluable to me!! US1Fountain, do you reccomend the V-6 module? If so, is it the 14 Degree advance module?
What is your total timing.
Do you reccomend anything else that I may be overlooking?
Thank's
Mikey