nitro pipe question

[joelauletta]

I have a nitro pipe with a 1.5 " band. Where do I measure from? 1st line ,2nd line or in the middle.

Thanks for your help in advance.

 

[moparbarn]

Middle is where I measure from.

 

[Robert Pickard]

Middle

 

[julianconde]

Middle

 

[joelauletta]

Thanks guys any idea where to start?

 

[joelauletta]

Sorry forgot to say running a new Picco 45 blackhead.

 

[julianconde]

9 3/4" and work your way little by little down to 9 1/4" to 9''

 

[BigChuck]

What pipe are you using...

 

[Andy Greene]

What pipe are you using...

And in a Mono or a Rigger ? that will help on start point- 9 would be short on a mono imho. If you can make it work- run with it.............

 

[dave roach]

What pipe do you have.

Dae

 

[joelauletta]

Mac 1120 on a rigger

 

[Amp Eater]

Example say you want around 31k on the top end with a nitro engine.

1675(wave speed) x 170(timing) ÷ 9" (pipe length at MRP to Piston Face) = 31.64k rpm

 

[Andy Brown]

Example say you want around 31k on the top end with a nitro engine.

1675(wave speed) x 170(timing) ÷ 9" (pipe length at MRP to Piston Face) = 31.64k rpm

Exhaust gas temps, which effect wave speed, can vary greatly in a nitro engine depending on many factors.

A 9" pipe with 170 degrees of exhaust timing could produce as little as 25K and as much as 35K rpm.

Julian's advice is good for your Picco 45 rigger and could go even shorter if you are running 60% nitro or more.

 

[joelauletta]

Thanks for all the advice will keep you posted once motors are broke in . probably start longer on 45% to brake in than shorten and move up to 60%.