Comment

Comment by FD REBEL on January 4, 2014 at 1:14pm

Again the split tubing is for scavenging in the overlap phase of the cam also you pick up some strength in the system by the mid collectors. In some applications you get a small venturi effect as the gases pass through each other at different times depending on cam timing. Header design is an art in itself and can make HP or kill power if done wrong.

Comment by Kathy Kubara on January 4, 2014 at 12:57pm

Thanks guys, I feel a little smarter every time I read this

Comment by Dave Horwath on January 4, 2014 at 11:59am

Excellent points Mike, especially the hot foot! I know the used heat protectors on there shoes, heals because the floor would get unbearable! I don't know if they do that today/?!

Comment by Mike Kenyon on January 4, 2014 at 11:49am

wraping in this case is four fold,IMO.keep heat away from the feet.offer some impact resistance for small rocks,help with engine permormance.it's easier to jump out and work on if your not being burnt by the exhaust.

Comment by Hendricus on January 4, 2014 at 11:39am

Thanks FD! So your opinion is that the wrap is first and foremost for engine power.

I get a kick out of how much we can geek out over these photos, but there's so much to talk about! There's much to talk about when you appreciate vehicle and engine design. You know that that every element, including every screw choice and placement, is for a reason.

I'm also curious about the 2-into-1 collectors, and the four long tail pipes. Given the required restrictor plate, I'm surprised not to be seeing tight-to-the motor, Corvette style, 4-into-1 exhaust manifolds.

I wonder if this is for engine performance?

Or, is this part of making the racer rugged? The thought being if you break one of these 2-into-1 collectors/pipes, it is a better condition for continuing in the race, than if you broke a 4-into-1 collector/pipe?

Comment by FD REBEL on January 4, 2014 at 9:26am

Along with keeping the under hood temps down header wrap retains the exhaust gas heat IN the pipe, reducing the passing by air from dropping the temp until it exits the pipe. The reason for this is increased exhaust gas velocity.....heat moves towards cold due to it's higher pressure....example, in your bathroom, turn on a space heater and run the shower full hot, leave the room and close the door, come back in five minutes and open the door, you'll get blasted in the face with the heat build up as soon as you open the door.....
The reason for wanting this effect in your engine is INTAKE SCAVENGING. For a few degrees of crankshaft rotation at the end of the exhaust stroke and beginning of the intake stroke, both the intake and exhaust valve are slightly open, this is called valve overlap. Overlap uses the speed of the exhaust gas as a "vacuum" to help draw a fresh intake charge into the cylinder, the faster the exhaust gas speed, the more vacuum you have to stronger draw more of an intake charge into the cylinder. This results in an increase in both horsepower and torque. I wrap everything I have headers on

Comment by Team Maranello on January 4, 2014 at 8:52am

Formula one cars use heat shield so the carbon fiber does not catch fire. This is the formula Gordon's version.

Comment by German Ali on January 4, 2014 at 8:26am

sorry brothers...I have some picts with a nice zoom (really near) on that side without wheel, from left, front and back side... But i thinking seriously in post that after the 1st or second stage, just for respect to RG and the Team.

Comment by Hendricus on January 4, 2014 at 2:59am

This pictures shows more than an open wheel well doesn't it?

Just one more glimpse into who Robby is as an owner/builder/driver.

Who else is like this, both current, and in racing history? Mickey Thompson? Parnelli Jones? Ferdinand Porsche?

I have no complaints of other approaches, such as the large, complex composite of experts approach. No doubt Robby is not doing this singlehandedly either, but he's definitely a gifted, experienced, jack of all trades, hands on, kind of racer.

Comment by Hendricus on January 4, 2014 at 2:48am

So what's the point of the wrapped exhaust?
(1) To reduce the radiating heat?
(2) To keep the pipes from cracking when they get drenched in water?

Is there a fender skirt that covers the exhaust?

• ‹ Previous
• 1
• 2
• Next ›
• Page