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MSD 6 Off-Road Timing?
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Author:  hillaholic [ Mon Apr 28, 2008 9:06 am ]
Post subject:  MSD 6 Off-Road Timing?
MSD 6 Off-Road Timing?

What do I set my full advanced timing to with an MSD 6 Off-Road and MSD distributor? It’s at 40* full advanced at 2500rpm right now and I think that’s a little high.

Also I would like to get a rev limiter for it any suggestions on a rev limiter?

Thanks, Brad
Author:  kybuggy1 [ Mon Apr 28, 2008 11:44 am ]
Post subject: 
For longevity, I 've always heard about 34-36 degrees total is all you want. I run 36 with 13:1 compression and racing fuel (114). I know of a guy running 45 degrees and 14:1 in his 2332 on 114, but I dont think long engine life is a priority for him.

Larry
Author:  Roy [ Mon Apr 28, 2008 12:03 pm ]
Post subject: 
32-34 on pump gas. Higher CR and race fuels you can go more.
Author:  Baddvw [ Mon Apr 28, 2008 8:45 pm ]
Post subject: 
I run my MSD setup at 32 degrees BTDC fully advanced at 3000rpm's, I use the light blue springs and silver bushing for the advancement stop, and I run 110 octane at 9.5:1, runs great, I use 7200 rev chip in my rev limiter.
Author:  Roy [ Tue Apr 29, 2008 1:34 pm ]
Post subject: 
FYI: Running 110 octane with that low of a CR will build up alot of carbon in your combustion chambers. It burns to slow for 9.5-1. You should mix your fuel some to combat this problem.
Author:  Baddvw [ Tue Apr 29, 2008 7:38 pm ]
Post subject: 
I have been running this for a while now....I check my plugs everytime before I go out and it is showing fairly light brown like it is almost perfect....so does that mean anything? or can it just build up carbon elsewhere except the plugs? I do know that higher octane fuel helps the engine run cooler because of the faster rate that the fuel burns. I am not trying to say you are wrong, I know that you know what you are talking about. I did run 93 pump gas and it runs OK but it ran a whole lot better when I switched to straight 110 octane. :)
Author:  kybuggy1 [ Tue Apr 29, 2008 11:27 pm ]
Post subject: 
Baddvw wrote:
I do know that higher octane fuel helps the engine run cooler because of the faster rate that the fuel burns. :)


Higher octane burns slower.

You may have not built up enough carbon in your combustion chamber (top of piston, valve faces, heads) for it to be sticking to your spark plugs yet. But you will. I had a 10:1 daily driven 355 that did the same thing Roy is talking about.

To accurately read a plug for AF ratio, you need to do a WOT throttle pass on brand new plugs, lift off the throttle, shut off the engine, and bump it in nuetral before decceleration begins, and pull the plugs to read before refiring. At least thats what the ol' timers always told me. :D

Larry
Author:  Roy [ Wed Apr 30, 2008 11:09 am ]
Post subject: 
Baddvw wrote:
I have been running this for a while now....I check my plugs everytime before I go out and it is showing fairly light brown like it is almost perfect....so does that mean anything? or can it just build up carbon elsewhere except the plugs? I do know that higher octane fuel helps the engine run cooler because of the faster rate that the fuel burns. I am not trying to say you are wrong, I know that you know what you are talking about. I did run 93 pump gas and it runs OK but it ran a whole lot better when I switched to straight 110 octane. :)


"Of course" it is going to run better on the 110 octane fuel. That's a given. There is nothing wrong with using this fuel. All I am saying is, if you intend to use this fuel, you should boost your CR in the motor to match the octane you use. It's better for the health of the motor, not to mention the added performance you will gain by boosting the CR. If I did not know what I was talking about I would not be posting advice. :idea:
Why not take FULL advantage of the extra cost of the race fuel and boost the compression ratio up. This will give you a huge increace in performance without hurting anything. Just a suggestion.
If it was me...........I would be running at least 10.5-1 if I was running straight 110 octane all the time. Maybe a little more depending on the camshaft I was using.

R
Author:  bruce 1 [ Wed Apr 30, 2008 12:10 pm ]
Post subject: 
I run straight 114. Everyone says it does make your motor run a little cooler. I only have 7:1 CR. :lol: It does make it run better. It just pops and cracks with 93 octane.

Plus it smells good 8)
Author:  m.ralston [ Wed Apr 30, 2008 1:19 pm ]
Post subject: 
bruce 1 wrote:
I run straight 114. Everyone says it does make your motor run a little cooler. I only have 7:1 CR. :lol: It does make it run better. It just pops and cracks with 93 octane.

Plus it smells good 8)
Hey Bruce! You know that you would have CR if you didn't drill holes in those valves. :lol:
Author:  kybuggy1 [ Wed Apr 30, 2008 2:03 pm ]
Post subject: 
bruce 1 wrote:
I run straight 114. Everyone says it does make your motor run a little cooler. I only have 7:1 CR. :lol: It does make it run better. It just pops and cracks with 93 octane.

Plus it smells good 8)


You run a 1461. You can't be giving advice to someone with a stroker! You have never driven one! :twisted: :lol:

Larry
Author:  bruce 1 [ Wed Apr 30, 2008 6:37 pm ]
Post subject: 
m.ralston wrote:
bruce 1 wrote:
I run straight 114. Everyone says it does make your motor run a little cooler. I only have 7:1 CR. :lol: It does make it run better. It just pops and cracks with 93 octane.

Plus it smells good 8)
Hey Bruce! You know that you would have CR if you didn't drill holes in those valves. :lol:


"CR" does stand for compression release valve? At least I thought it did. :idea:
Author:  Baddvw [ Wed Apr 30, 2008 7:34 pm ]
Post subject: 
Roy wrote:
Baddvw wrote:
I have been running this for a while now....I check my plugs everytime before I go out and it is showing fairly light brown like it is almost perfect....so does that mean anything? or can it just build up carbon elsewhere except the plugs? I do know that higher octane fuel helps the engine run cooler because of the faster rate that the fuel burns. I am not trying to say you are wrong, I know that you know what you are talking about. I did run 93 pump gas and it runs OK but it ran a whole lot better when I switched to straight 110 octane. :)


"Of course" it is going to run better on the 110 octane fuel. That's a given. There is nothing wrong with using this fuel. All I am saying is, if you intend to use this fuel, you should boost your CR in the motor to match the octane you use. It's better for the health of the motor, not to mention the added performance you will gain by boosting the CR. If I did not know what I was talking about I would not be posting advice. :idea:
Why not take FULL advantage of the extra cost of the race fuel and boost the compression ratio up. This will give you a huge increace in performance without hurting anything. Just a suggestion.
If it was me...........I would be running at least 10.5-1 if I was running straight 110 octane all the time. Maybe a little more depending on the camshaft I was using.

R


So....what camshaft do you prefer to run? I run a fk-7 Engle cam, I like it because of the torque in the mid-rpm's
Author:  Roy [ Wed Apr 30, 2008 9:20 pm ]
Post subject: 
That's a good cam. FK-8 is good too. You will have gobs of midrange torque no matter what cam you put in it. It's a stroker. You could put a stock cam in it and have tons of midrange torque.
I wouldn't change a thing. Just pull out some shims and install some thinner ones. You be surprised how much better it will run. Once you do this though, there will be no pump gas allowed anymore. :?
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