Thank you for your response. Thank you also for the article you wrote in the Spring 2003 issue of Pantera International.
quote:
Originally posted by hemip:
A. The Big Bore header by zise is fairly good. But the port matching is many times bad,and needs to be grind-out. The BB mufflers is restrictivee. So, a set of port matched big bore;s and a good muffler is OK.
B. A header has a diameter that creates exhaust speed, and a lenght that creates pulses. This makes the headers to work at a certain rpm.
C. What creates a broader powerband is the lay-out of the headers. So, here the big bore are the same as Pantera original system, a four in to one. Headers is tuned to give better volumetric efficency at the selected rpm. Which can be at max torque rpm, or max Hp rpm. That is up to the engine builder.
D. For the best volumetric efficency, no enging likes back pressure. Well, sometimes a two stroker.
Goran Malmberg.
As I am not the wealthiest man, and have many Pantera Projects I want to accomplish, I have had to prioritize them into my cash flow capabilities. Ultimately, they will all be accomplished, but, in order of cost/benfit analysis, may I ask a few more questions of you, please?
1.) Carburation:
Which carburator do you like best, or could you recommend for my application? I drive approximately 2/3 in the countryside, away from traffic, with half in turns and curves in the mountains and the other half on straight line freeways. In traffic, occassionally I accelerate hard, but normally do not achieve high RPMs, and only for short bursts. Maybe once a year a like to go top speed, flat out, again only for very short duration.
So, I'm thinking, maybe a 700 cfm, double pumper would do nicely. I have a stock engine, no modifications with 42,000 relatively easy miles, and no problems.
Do you like: (a) Holley. (Seems the choke never works on Holleys) (b) Carter. (c) Speed Demon. (d) Other type.
2.) Intake Manifold:
I'm told short, flat manifolds are better for Horsepower and taller, longer travel, high rise manifolds are better for torque. Is this an accurate understanding? Is it even worth it to change the standard manifold? Maybe later?
Do you think my driving style/needs would be better satisfied with an emphasis on Horsepower or Torque?
3.) Wheels:
(a) I am leaning toward Pantera East as a wheel/rim vendor, because (i) I like their looks the best and (ii) they have the 16x8" front and 17x11" rear available in the Campagnolo copy ("Campy clones") style. Is their version of this rim, say 'competitive' in the "weight" category? I doubt I'll have the opportunity to weigh each vendor's wheel/rim product.
4.) Which commercially available exhaust system do you like best? Do you have an idea what Horsepower or Torque advantage can approximately be expected, even in terms of relative percentages?
Thank you for your answers, knowledge and efforts. Perhaps many others may have wanted to know these answers to their same questions and not had such opportunity to be offered informed advice. Hopefully, many others may read our Posts on this Forum, and become a little happier with the knowledge they gained.
Ron Norman
[This message has been edited by ron norman (edited 07-04-2003).]
[This message has been edited by ron norman (edited 07-04-2003).]
[This message has been edited by ron norman (edited 07-04-2003).]