Drag pip[es get red hot..

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Apr 6, 2016 | 04:36 PM

#51

Joe_G

Stellar HDF Member

Joined: Jan 2013

Posts: 2,721

Likes: 103

From: St. Louis, MO

Quote:

Originally Posted by glidein wide

I'm sure thumb screws do help with the back pressure, I've never tried them so I won't put them down. People put down the cones but they work AND keep the gases getting back to the exhaust valve to a minimum like there designed to do

It's not back pressure that is the issue. It's the reversion.

And for sure the cones work. I noticed no difference going back and forth, both are great.

Here I'll make it easy for you guys. This video opened my eyes:

Apr 6, 2016 | 04:41 PM

#52

Joe_G

Stellar HDF Member

Joined: Jan 2013

Posts: 2,721

Likes: 103

From: St. Louis, MO

Quote:

Originally Posted by rk1997

There was a time I'd drop the hammer at 12.5k rpm and shift when it floates. With straights. (Wasn't a HD).
I love straights, but I'm 60+ now and my wife won't let me have them. Lol

I drop it at about 5800 and shift at 7... through cutouts....

Apr 6, 2016 | 04:51 PM

#53

rk1997

Tourer

Joined: Feb 2016

Posts: 344

Likes: 6

From: WV

I never let off the throttle. When the hand went up I'd nail it, then I only let off at the finish line. Not when shifting. I power shifted.
I beat some pretty nice cars on a bike back then. Lol

. Hopped up cars in the 70's man, on a bike. They ran good back then man.

My brother-in-law said he'd lay in bed a listen to me run them at night and i was miles out of town. lol. Straights sound good imo. Lol

Apr 6, 2016 | 04:58 PM

#54

rk1997

Tourer

Joined: Feb 2016

Posts: 344

Likes: 6

From: WV

Quote:

Originally Posted by glidein wide

Sorry to hear, LOL

Lol

Apr 6, 2016 | 04:59 PM

#55

Harley-Davidson

Cruiser

Joined: Jul 2015

Posts: 209

Likes: 8

From: Northern Wisconsin

Quote:

Originally Posted by rk1997

Exhaust can flow backwards they say in straights killing the performance.

The exhaust gases themselves do not get reflected back up the pipe. They escape out the end of the pipe. It is the shockwave that travels ahead of the pulse of hot gas that runs into a wall of cold air at the end of the pipe, which causes the hot gas to slow and expand. The shockwave starts another wave (the one you hear) by hitting the "wall" and at the same time is reflected back up the pipe. It can either help you or hurt you, depending on how the pipe is tuned.

Apr 6, 2016 | 05:06 PM

#56

Joe_G

Stellar HDF Member

Joined: Jan 2013

Posts: 2,721

Likes: 103

From: St. Louis, MO

Quote:

Originally Posted by rk1997

I never let off the throttle. When the hand went up I'd nail it, then I only let off at the finish line. Not when shifting. I power shifted.
I beat some pretty nice cars on a bike back then. Lol

After two aluminum rear ends and three aluminum transmissions I stopped power shifting a Corvette.

You might enjoy my friend's real 1969 Z28 w/ its 302... he has a dog box tranny built for this. Watch his left leg.