Let's talk about porting

[papa_smurf49319]

not to thread jack or anything, but is there much gain to be had with the worm holes?

 

Cody

[SLORYDER]

not to thread jack or anything, but is there much gain to be had with the worm holes?

 

Cody

I've heard that worm holes contribute to midrange power, but not for sure.

[papa_smurf49319]

ya ive heard that they smooth the powerband out.

[AKheathen]

PT High revs peaking at 7,500 rpm? I have several dyno sheets that put the PT mids peaking at over 8,000 rpm. So I hardly doubt the high rev was designed to peak at less rpm than than the high rev.

x2, the 7500 peak is alosest to match the pro-circuits. do a little more reaserch on the pipes, but i'd have to guess you would want it to peak around 8500-8700......just a guestimate, as i don't know that as a fact, but i know the procircuits are low vs. pt highs......and remember, opening transferports too much can shot citcuit the charge, as the air will be moving slower. there is a timing calculation to figure the size range of each port

[mopar1rules]

PT High revs peaking at 7,500 rpm? I have several dyno sheets that put the PT mids peaking at over 8,000 rpm. So I hardly doubt the high rev was designed to peak at less rpm than than the high rev.

 

i would think that the hi-revs would be good for 8800-9000. this is the place where i found the dyno sheet to the paul turner hi-revs. check out the dyno sheet here. not saying its right, but just where i found my previous info. sorry if what i had posted was wrong.

 

http://www.angelfire.com/extreme2/yambanshee/techtips/pipes/pipeinfo.html

[Snopczynski]

Pro circuits peak at around 8,750rpm.

 

I would guess the pt high revs peak at around 9,500rpm at the least.

Edited October 27, 2009 by Snopczynski

[SLORYDER]

Pro circuits peak at around 8,750rpm.

 

I would guess the pt high revs peak at around 9,500rpm at the least.

What's the rev limiter set at (stock)?

[Snopczynski]

Somewhere around 13,000 rpm.

[SLORYDER]

Somewhere around 13,000 rpm.

 

So.

By raising the exhaust port roof, am I actually adding torque at the same peak location in the rpm range or am I leaving it the same and just shifting the torque peak higher in the range?

[blowit]

So.

By raising the exhaust port roof, am I actually adding torque at the same peak location in the rpm range or am I leaving it the same and just shifting the torque peak higher in the range?

 

 

 

HP = torque * rpm/5252

[Snopczynski]

Read the book.

[SLORYDER]

HP = torque * rpm/5252

Exactly. So does performing this actually increse torque, or does it shift its peak higher in the rpm range?

Both would result in an increase in hp.

 

imo

widening would raise peak torque and maybe shift the peak a bit

raising would be more of a shift than a peak gain.