A thumper cam and glasspacks?

 

And a decent amount of compression

 

Crispness

 

why?

 

What are your other goals? Clean efficient burning and good bottom end power for street use will be in conflict with a cam that produces that lopey sound.

 

this is VMF, so low probability of getting theory on here...


my theory, lower compression, low initial timing, combined with a really lean idle results in a VERY slow burn rate.

a slow burn rate combined with opening the exhaust earlier results in the explosion popping out the exhaust because it's so late.


high compression, more initial timing, a slightly richer mixture will burn off faster and not produce quite the crack out the exhaust when that valve opens well before BDC.


I would be surprised if that 302 with it's Performer RPM kit has any significant compression in it.


here is dull and blaty…. 244 @ .050 exhaust lobe with a 1.7 rocker. 9.3 compression.

 

this is VMF, so low probability of getting theory on here...


my theory, lower compression, low initial timing, combined with a really lean idle results in a VERY slow burn rate.

a slow burn rate combined with opening the exhaust earlier results in the explosion popping out the exhaust because it's so late.


high compression, more initial timing, a slightly richer mixture will burn off faster and not produce quite the crack out the exhaust when that valve opens well before BDC.


I would be surprised if that 302 with it's Performer RPM kit has any significant compression in it.


here is dull and blaty…. 244 @ .050 exhaust lobe with a 1.7 rocker. 9.3 compression.

https://youtu.be/FvrOUYh2zV8

Actually, a lean idle (or lean condition in general) has a faster burn rate.

That particular sound in the original clip (not the lump of the camshaft, but the crackle if you will) has to do with high(er) cylinder pressure.

A 244@.050 cam with a tight Lobe Separation Angle grind will build higher cylinder pressures than the same duration, but a wider LSA camshaft. There are many ways to design and build a high-performance engine.

 

There are many things that affect sound. That car sound like it needs more timing to me. Doesn't sound very good IMO.

 

never mind the ticking noise just water going thru the electric fan

GT40P Edlebrock Preformer 5.0 heads B303 TriY's Xpipe Jegs "deep tone" 2.5"

 

Not to hijack your thread, but just ran across this video last night (speaking of engine sounds...wait for it at 1:00 and 1:30. That's a sound I'd like to go for)

I can't believe he didn't strap the car down while it was on the dyno.

 

Not to hijack your thread, but just ran across this video last night (speaking of engine sounds...wait for it at 1:00 and 1:30. That's a sound I'd like to go for)


https://www.youtube.com/watch?v=tdPfQ1HiiTE


I can't believe he didn't strap the car down while it was on the dyno.

CRAZINESS on not strapping that thing down!

 

I'm not getting in the debate of "how to get it", but I want that sound too!

 

This is my 6 cylinder sound

https://drive.google.com/file/d/1_4h4mkzzQ2ADHXCpYWLOreLC0VrwzvDC/view

 

I have to say, either you have one heck of an audio engineer, or this is the best sounding Six I've ever heard, bar none.

Nice!!!

 

Any time you get away from stoich too far (either way) you slow the burn rate. Too lean is more dangerous to the engine, because the extra oxygen wants something to burn, and it'll try to grab aluminum and iron if there's no fuel left. It burns HOT, too.

Too much fuel, the extra fuel has kind of a buffering/cooling effect, but it slows down the kaboom as well.

The large cam overlap makes for the 'lumpy idle', because you're shooting exhaust up into the intake while both valves are open at low RPMs. It makes intake vacuum low, and hampers idle quality because you're sucking in already-burnt fuel along with the fresh mix. You also get a really hot exhaust, because some of the fresh intake charge is blowing out the header.

High compression makes a series of very crisp, noticeable explosions - a sharp exhaust note. Low compression makes the sound more of a rumble than a bang, but cam choice does play into this too.

Glasspacks have a very high, tight snarl to them. Chambered exhaust (flowmasters) have a 'firecracker in a culvert' tin-can hollow sound, but lower note. Turbo mufflers are somewhere in between the two; a mellow note, but without the 'wide open chamber' reverb.

For a performance car, I love glasspacks, but man, it's painful at certain RPMs out on the road. For everyday use, I really like turbo mufflers (Magnaflow's a very common brand).

 

Any cam around 300 adv. duration and the appropriate/corresponding dynamic compression will give you that sound.

Sent from my Pixel 2 using Tapatalk

 

Thanks Grim - no that is my six. people cant believe I dont have a 289 under the hood.