Any suggestions on size of pipe or what for muffler...
Here's the motor setup... stock carb, intake, head, block was bored .20 and rebuilt. See picture for the header that is installed...
I want it to have a low rumble that is not over powering and I don't want it to sound like a rice burner, Low pitch is best. Lot to ask for out of a 4 cyl but I hope to get as close to a V8 rumble as I can.
Pintony has suggested (as I recall) a 1.75 pipe to a glass pack and then a turbo muffler out the back.
Any other suggestions?
:q:does the motor have stock cam? has the head been cut? the carb been rejetted? the distributer recurved? if not then i would use nothing less than 2" pipe. a turbo type muffler at rear and maybe a small at least 2" core (perforated core) in between if the low speed resonance is too much. if you have an aftermarket cam or any of the other mods then i believe you should go with an even larger pipe size-2 1/4"
SRT, only mods are the header and cyls bored .20 - all the rest is stock.
just to be sure I understood your suggestions correctly... 2" pipe, turbo muffler and the "2 inch core (perforated core) in between" that you refered to would be the same as what I'm calling a "glass pack"?
and the reason for the "in between" (or glass pack) I'm guessing is for a lower sounding rumble... and will tame it down a bit and perhaps enhance the sound a bit?
did I get it right?
On my 87 Mustang, I've got a 2.3, but I can't imagine there being much difference in sound, I am running 2.25" dia. pipe single system, to a 2.25" dia. cat and a 12" long 2.25" dia. glasspack behind the axle. It gives a decent low tone without having the raspy ricer sound (I can't that stand either). If you can fit it, I would go with a second glasspack in the system before the axle, which will cut down the resonances at low RPM, and cut out even more of the raspy ricer noise.
I have run glasspacks on every car or truck I have replaced the exhaust on, and loved the sound of them, and to those who say they burn out, yes they do, but considering the last set I had burn out were over 15 years old, I would say that they are more likely to rust off before then. BTW, that burned out set was on a 72 Blazer that spent most of its life pulling a 9000 pound travel trailer up 8% grades in Northern AZ. The next victim to get glasspacks will be the Kia.
I used to replace mufflers w/glass packs all the time in my younger days... they were cheeper but usually were much louder than mufflers, and they sounded "mean." I'm not really looking for loud but a little rumble would be nice as long as it's not overpowering...
what difference would I notice between 2" and 2.5" pipes... and would there be any advantage/disadvantage to preformance either way?
sometimes when you have a long run of large diameter pipe and a small motor you will end up with a low to mid rpm resonance that will fill the car with an annoying deep sound that can drown out most other sound. the glass pack in that long exhaust pipe (assuming you use a muffler at the rear in the stock location) will absorb those resonating sound waves. a perforated core on the glasspack (as oppossed to a louvered core) will add very little to no additional backpressure to the system.
i really think that unless you run the thing with the pedal to the floor all the time, the 2" will be fine. anything smaller and in my opinion you are cheating yourelf out of power and mileage
Quote from: srt on January 31, 2007, 10:37:04 PM
sometimes when you have a long run of large diameter pipe and a small motor you will end up with a low to mid rpm resonance that will fill the car with an annoying deep sound that can drown out most other sound. the glass pack in that long exhaust pipe (assuming you use a muffler at the rear in the stock location) will absorb those resonating sound waves. a perforated core on the glasspack (as oppossed to a louvered core) will add very little to no additional backpressure to the system.
I agree with SRT!!!!
OK... 2 inch pipe to glasspack w/perforated core to turbo muffler in stock location - we have the plan!
on the subject of glass packs failing... I asked the muffler guy and he said : Yes they do fail... main reason for early failure would be cold weather! heating them up and cooling them quickly will cause them to fail sooner than designed, water puddles will do this too. Muffler guy said it's mostly a regional thing... up north they usually fail quickly due to the cold weather and down south they should last much longer. Since I will not be driving this car in the winter I don't see it as a porblem in my case... if this was a daily driver and driven in the winter I wouldn't bother putting one on based on what he explained to me.
This is one of my favorite topics aside from Carburation and Ignition. I would go with a large resonator as far forward as I could go then a turbo muffler back in the regular muffler mounting position. Why???? Because the fact that this exhaust system is prone to resonate that far back is in itself a testiment to how dynamically correct this exhaust design really is. The resonance is caused by a sonic shock wave caused by the chemical reaction that occurs during ignition. The ka-boom is caused by the explosion of the airfuel mixture. The resonator diffuses the sonic resonance via geometry, ergo using it's power against itself. The glass pack absorbs the shockwave with absobtion medium (fiberglass). What I did with ThunderPinto was to wrap my carryout pipes with a high heat insulating tape, two layers thick, and tight, from the exhaust manifolds down to the mufflers. Aprox. 3 feet. Goodby resonance and hello heatsheild. The icing on the cake was two v8 sized mufflers. So put in a 2.250" resonator up front and run 2" back to a v6 sized turbo muffler in back and that should meet or exceed your expectations. all the bass without the alto.
High_Horse
High Horse... I like the new picture...
When I called the muffler shop the person I spoke to did suggest a resonator. I told him what was being suggested to me (glass pack) and that "The FordPinto Experts" were the ones I was getting the info from he was willing to bow to their expertize. I could tell however it wasn't his first choice. Then we got to talking about the whole glass pack failure issue and didn't talk about resonators again.
So now I wonder... would the resonator work better in my case (4 cyl w/header) than a glass pack for more bass and less noise for the driver. Also would the resonator be a more reliable solution than a glass pack...
Anybody have experience using both in similar situations? and what did you think?
Quote from: Cookieboy on February 01, 2007, 08:26:20 PM
High Horse... I like the new picture...
When I called the muffler shop the person I spoke to did suggest a resonator. I told him what was being suggested to me (glass pack) and that "The FordPinto Experts" were the ones I was getting the info from he was willing to bow to their expertize. I could tell however it wasn't his first choice. Then we got to talking about the whole glass pack failure issue and didn't talk about resonators again.
So now I wonder... would the resonator work better in my case (4 cyl w/header) than a glass pack for more bass and less noise for the driver. Also would the resonator be a more reliable solution than a glass pack...
Anybody have experience using both in similar situations? and what did you think?
Again I have to agree with SRT,
I had that system on my Purple Pinto Pre-Turbo and it sounded the best of any system now or in the 20+ years driving Pintos.
From Pintony
Hello Pinto Guys, Don't listen to my husband because he does not know what he is talking about. Thank you.
His_Highness_Horse
Quote from: High_Horse on February 02, 2007, 03:15:57 AM
Hello Pinto Guys, Don't listen to my husband because he does not know what he is talking about. Thank you.
His_Highness_Horse
He knows more than most!!!!
well a couple calls and more opinions and I think... I'll go w/the glass pack. sound difference between glass pack and resonator should be about the same but a resonator will be more expensive. Chance of failure for both is appox the same... but due to summer driving only it shouldn't be an issue for me either way. One person I talked to this morning who doesn't even like glass packs (failure reasons here in the north country) said if I was gonna do either go with a glass pack.
+ seems that most the votes here in this thread point to a glass pack setup as the most favored setup.
Glass Pack It Is!!!!
Thanks Much! for all the imput, your help is always welcome.
even you High Horse, I give you credit even if the wife doesn't ;)