Thanks Motorman,

That's exactly what I was trying to get to.
. . I'll see if I can get this hair back into my head, now.

No hitter
call either Robert at ashford hobby
www.ashfordhobby.com
or Lee Muse at Winner Circle
www.gasrccar.com

They both stock engine parts and are great people to deal with

Motorman, whats your opinion of the OS.#8 plug? I been using these exclusibly over the MC59s for the last few months and the tune of the engine seems to stay the same longer. I want to try the O'donnels but I cant find them localy.,

Thanks,

Steven Muller
MPP Team Palmaris Racing

I personally have only used them a few times, and they worked well. I would say they tend to be touger than the mccoys. They're just hard to locate most of the time and relatively expensive. If you like the OS8 get you some odonnel 77's you will really like those.

Motorman...

what is your recommendation for my motor....

-powerplant: Novarossi NS12T1 3 port
-fuel: odonnel 30%
-shimming: ???????

based on what I have been teading in this thread, you know your "s h _ t "

Motorman,

I forgot

I currently use RB 1050-7's,

but I will use whatever makes it better.....

Don't change nuthin cept maybe to a 77 odonnel plug. Vegas has wierd air densities from time to time, In fact the air is really dense most of the time. If you experience plug failures from detonation go to a 99 odonnel. but for the time being it looks like you have a good combo.

thanks fo rthe response.....

I'll order some odonnel plugs, but from who????

any recommedations???

Hi Motorman.How do you rectify this condition?
Thanks

Motorman,

I saw that there is 77's but the picture is for a standard plug, is there a 77 turbo plug from O'donnell????

Motorman,,,,,, I read this And was wondering...

I've been keeping my mouth shut for a long while but I have to say somthing.
TG you need to let go of the marine mentality man. If it works for you great but I know I can make more power than you on 30% at .018 and 40% at .021 with zero detonation at 4.5 mm exhaust height. we do it every day no problems. What you shouldn't be doing is spinning people off towards unrealistic head clerance on their production motors. If its a hand built thats a different story but you do them a disservice by directing then toward toward a global meltdown of their hardware.

If you feel inclined to take .008 thousanths head clerance advice do so at your own risk that is all I have to say.



I have ran My motors ( 12`s ) at .018 With 30%.

I wanted to what you felt about about .015 with 30%
I have fuel made to my spec. with 6% caster & 4% synth.
I have raised the Exguast timing .007 in a way with keeping the 4.5 mm rule in check.
This motor will be a RS- 12 TS1 Turbo with a #5 plug.

Let me know what you think.
I personaly think I am Ok But I have not been in the Motor bus. As long as you . Thanks In advance.

I will say this with reservation, Yes you can go there just watch the temp, it may get real fussy at low altitudes, so it depends on where your located. Also watch out for detonation. I would recommend a cold plug like an odonnel 99 or an MC9 mccoy. In the turbo situation try a 7 and if alls good drop to a 6.

what its going to do for you is add torque you may lose a few rpm on the top. The other way to skin the cat so to speak is to go to 40% and use the cold plugs at .018 this works well in moderate conditions. at low alt or above 80 degree conditions you may need to go .021. Air density,temp and pipe wave strength are the critical factors that will determing the point of detonation at a given trapped compression ratio. It is something you will need to fine tune for wherever you are in the world and the conditions of the moment

I've tried larger combustion chambers with tight head clearances but the squish velocity is just to slow in my opinion to achieve the burn rates in the cylinder I'm looking for.

I'm really big on chamber design,squish velocity, tumble and burn rates in the cylinder. Max power is all about cylinder charge speed, tumble and burn rate at the highest exhaust timing you can get away with without killing low speed torque. Thats the jist in a nutshell.

you'll notice that automotive manufacturers are dragging huge amounts of power out of older engine designs like the pushrod gen 4 small block engines. It has come from 4 things
1 injector targeting
2 port swirl
3 combustion chamber design
4 charge direction at the plug

yes their 4 strokers but those for me are the highest priorities on my list.

Timing IE. the camshaft/valves (crankshaft, port shape)is the easy part.

the oddity on 2 strokes is the tuned pipe, often over looked for the cheap or cool pipe of the week will make or break the performance of the engine.

It is the single most important part of the combination bar none. Throw all that stuff I mentioned above this line away and I can tell you for a fact that the proper pipe will wring out more power as a single item that all the above combined.

wow this reminds me of posts I used to make, Musta had a moment er sumthin.

The more the merrier hopefully !

So how do you choose the correct pipe??

I have an NSR 3 port with 0.014" head clearance running Novarossi no 5 plug on 16% Nitro.

The track is shortish so will need low end power.

There are different makes of pipes but what are the specs that determine which one to choose or do you believe the hype of the people selling them??

Cheers