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65 Fuelie with sidepipes

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Old 02-14-2017, 09:12 AM   #1
MarkC
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Default 65 Fuelie with sidepipes

I just changed out my stock intake to a 69 Z/28 intake and I used the intake gaskets with the intake exhaust port blocked off. I have a 66 L79 with sidepipes. As expected I got the exhaust flutter. It is worst than I was expecting so I am going to put the Nev Williams crossover on latter this week. So I was thinking about the 65 fuelie with sidepipes. Did it have the flutter or what?

Over the last couple of months I have changed my exhaust manifolds to ported 2 1/2 inch Brzezenski's, 3 inch vette packs ( 2 1/4 inch inside diameter ), Z/28 intake reskinned by McNeesh and a 650 AED carb. The power increase is significant. I plan to put it back on a dyno shortly. Here is a video.

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Old 02-14-2017, 09:17 AM   #2
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The video is not transferring.
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Old 02-14-2017, 09:22 AM   #3
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Quote:
Originally Posted by MarkC View Post
I just changed out my stock intake to a 69 Z/28 intake and I used the intake gaskets with the intake exhaust port blocked off. I have a 66 L79 with sidepipes. As expected I got the exhaust flutter. It is worst than I was expecting so I am going to put the Nev Williams crossover on latter this week. So I was thinking about the 65 fuelie with sidepipes. Did it have the flutter or what?

Over the last couple of months I have changed my exhaust manifolds to ported 2 1/2 inch Brezenski's, 3 inch vette packs ( 2 1/4 inch inside diameter ), Z/28 intake reskinned by McNeesh and a 650 AED carb. The power increase is significant. I plan to put it back on a dyno shortly. Here is a video.
I remember having a 69 Z28 Camaro with chambered exhaust and that flutter was normal. What I would give to experience the flutter of that car again right now.
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Old 02-14-2017, 10:11 AM   #4
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All the C2 fuelie's had that "flutter". I never knew it was a problem until I started getting on Corvette forums. I didn't know anyone else that even noticed the different sound.

I always liked that distinctive sound they made.
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Old 02-14-2017, 10:35 AM   #5
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My '65 fuelie has sidepipes and I think it sounds fantastic with more "pop" in the exhaust note than other cars. I believed it was from the 11:1 compression and the 2.5" pipes.
What do you guys mean with "flutter"?

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Old 02-14-2017, 10:39 AM   #6
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The crossover will get rid of the flutter.
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Old 02-14-2017, 11:31 AM   #7
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Originally Posted by 1965fuelie View Post

I think it sounds fantastic with more "pop" in the exhaust note. What do you guys mean with "flutter"?
Probably the same thing you mean with "pop".

I used to describe that same exhaust note as "flappy" and I don't think that's even an English word.

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Old 02-14-2017, 02:33 PM   #8
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Let me back up here, I had the very restrictive sidepipes with 2 inch manifolds. The first bend leaving the manifold was 1 7/8" so the inside dia. was about 1 5/8". I did not want headers, I decided to go with the 2 1/2 " ported manifolds which I have had ceramic coated. The pipes are manderal bent going into the vette packs which are very open. I did the exhaust before doing the intake and I felt the sound and power increase was great. You could really feel it over 4000 rpm's. then I changed the intake and used the gaskets that block the exhaust. That's when this fluttering showed up. Once you get over 2500 it disappears but is very noticeable at idle and when you let off the gas. I did some research on this and found the Nev Williams crossover which I plan to do. I don't know how noticeable this flutter would be with under car exhaust or the factory sidepipes. I have heard plenty of fuelies and never noticed tha flutter. My theory is the vettepacks or so open that you hear it. Nev Williams installed vettepacks on his car andthe car was too loud plus the flutter. He fixed both of those issues with the crossover. Here is a picture. My video is too long so I'll try a shorter one.
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Old 02-14-2017, 02:40 PM   #9
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Quote:
Originally Posted by MikeM View Post
All the C2 fuelie's had that "flutter". I never knew it was a problem until I started getting on Corvette forums. I didn't know anyone else that even noticed the different sound.

I always liked that distinctive sound they made.
My theory is the vettepacks make it more noticeable. I tried to get it on a video but the phone doesn't pick it up.
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Old 02-14-2017, 04:39 PM   #10
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I have a short 20 second vid and it still exceeds the max allowed. Sorry.
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Old 02-14-2017, 06:44 PM   #11
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I don't believe I've ever seen a 65 fuelie with original sidepipes. They must have been pretty scarce...
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Old 02-14-2017, 09:45 PM   #12
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Quote:
Originally Posted by MarkC View Post
I have a short 20 second vid and it still exceeds the max allowed. Sorry.
Hey Mark,

Go to YOUTUBE.com and just upload the video. Make it public so all can see. Then copy the browser link into your next post here.



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Old 02-14-2017, 10:03 PM   #13
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Here ya' go MarkC:




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Old 02-15-2017, 07:37 AM   #14
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Thanks Jim, that vid does not really capture the flutter. I'll send you another one that does. Mark
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Old 02-15-2017, 08:21 AM   #15
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geez... flutter.. must be a slow day on the florum....

next it's gonna get sidetracked to a discussion of what is a 'correct' "Flutternutter"....

https://en.wikipedia.org/wiki/Fluffernutter

Bill

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Old 02-15-2017, 01:27 PM   #16
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Ok MarkC, here's your latest video:

https://www.youtube.com/watch?v=x3FF...ature=youtu.be

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Old 02-15-2017, 01:37 PM   #17
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Thanks again Jim, when I let off the gas you can hear the flutter.
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Old 02-16-2017, 03:51 PM   #18
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Here's the thing... that sound is just typical exhaust scavenging or a lean moment as you close the throttle.

Its ONLY noticeable on FI cars because the intake does not have a crossover tube for the divorced choke setup. Block off any intake crossover on any engine with a decent amount of overlap in the cam and you'll hear it. FIs and 69z28s have the OE 30-30 cam which has a ****-TON of overlap.

The less restrictive the exhaust, the more noticeable it is.

I have N11 on my Fuelie, and Chambered Exhaust on my 69Z. You can hear it as more of a POP or Crackle on the rev down in the Camaro.... I have my intake crossover blocked to reduce intake heat as I have no need for the choke when i drive that car. Sometime ago, (with another chambered exhaust setup) I had a balance tube installed on my Camaro and it really reduced the crackle, or raspy-ness.

Installing a small exhaust balance tube in the exhaust will change the exhaust note of your sidepipes or any exhaust system for that matter - it may also create an unwanted drone - so be prepared - you may not like it. MAny say that it adds a few ft/lbs and can aid in fuel economy - i never noticed anyting other than the change in tone.

Cheers.
A

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Old 02-17-2017, 08:18 AM   #19
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I took the car in yesterday for the crossover and will get it back today. I am hoping for the same sound I had before the intake swap.
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Old 02-17-2017, 09:23 AM   #20
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Quote:
Originally Posted by aaronz28 View Post
Here's the thing... that sound is just typical exhaust scavenging or a lean moment as you close the throttle.

Its ONLY noticeable on FI cars because the intake does not have a crossover tube for the divorced choke setup. Block off any intake crossover on any engine with a decent amount of overlap in the cam and you'll hear it. FIs and 69z28s have the OE 30-30 cam which has a ****-TON of overlap.

The less restrictive the exhaust, the more noticeable it is.

I have N11 on my Fuelie, and Chambered Exhaust on my 69Z. You can hear it as more of a POP or Crackle on the rev down in the Camaro.... I have my intake crossover blocked to reduce intake heat as I have no need for the choke when i drive that car. Sometime ago, (with another chambered exhaust setup) I had a balance tube installed on my Camaro and it really reduced the crackle, or raspy-ness.

Installing a small exhaust balance tube in the exhaust will change the exhaust note of your sidepipes or any exhaust system for that matter - it may also create an unwanted drone - so be prepared - you may not like it. MAny say that it adds a few ft/lbs and can aid in fuel economy - i never noticed anyting other than the change in tone.

Cheers.
A
A crossover pipe only increases torque if the pipe is very short, large diameter and close to the exhaust valves. If I were adding one to a C2 I'd use an oval shaped 4" diameter tube as close to the engine as I could get it.

An X-pipe absolutely adds torque.

Last edited by 65tripleblack; 02-17-2017 at 09:37 AM.
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