Real Power/et difference from a inframe drag pipe to an out of frame ?

[southside]

What kind of real difference can be seen in et and power with no other changes other than jetting/power jet changes can be seen between inframe drag pipes to out of frame on a given motor?

[southside]

No input on this subject?

[sprinklerman]

Depends on how the motor is setup.

[southside]

We'll say on a drag ported motor on alcohol for example

[WINDYCITYJOHN400]

It's not a simple answer. The peak rpm changes between In-frames and OOF's. Depending on compression, dome design, port timings and even port angles will determine the power.

There isn't a promise of more power with OOFpipes.

[sprinklerman]

We'll say on a drag ported motor on alcohol for example

That's way too vague of information. Port angles and dome design plays a big part. Shearer has stated that himself on SS.

[fastkid]

From shearer, 4-5hp gain going to oof vs inframe once you change dome spec and ex shape on a 392 cub.

[southside]

Thanks fast kid

[fastkid]

You bet. What motor you running? He also said the same comparison was around 10hp on a 421. So it could be different for other size motors.