Straight pipes?

Step-down said:
My 56' Merc Y- Block straight out the back sorry not a Flatty ....but sounds sweet...
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I have straight pipes on my 59 292. It had a little too much sharp edge so I made some 5" baffles and stuck in the end of the pipes. Its just as loud but a softer tone. Straight pipes make music!
 
I would say 1 1/2" would work fine for a stock or near stock engine. Another thing is higher compression, that will make a bark.
In highschool I had a 33 Chebby with a black iron pipe exhaust, my Dad was a plumber.
 
I agree with the 1.5 or 1.75 pipe statements. I will try to get some video of the difference in sound between them. I think it also depends on your manifolds as well.

36. I'm running stock manifolds, 2into1, 1.75, glasspac, all the wayout to the back. Sounds great, I would suspect just straights would be just a bit louder as the glasspacs don't do a lot really.

38. Cast iron Fentons, duals, 2" pipe, dropped before the rear wheels. LOUD, way to loud for comfortable driving. To me, it gets annoying fast.

So if you go straights, I'd suggest 1.5 or 1.75 all the way out to the back.
 
Tinker said:
I agree with the 1.5 or 1.75 pipe statements. I will try to get some video of the difference in sound between them. I think it also depends on your manifolds as well.

36. I'm running stock manifolds, 2into1, 1.75, glasspac, all the wayout to the back. Sounds great, I would suspect just straights would be just a bit louder as the glasspacs don't do a lot really.


Tinker why are you running 2 into 1 instead straight dual exhaust? And do any of you guys use any sort of equalizer pipe in the center of your duals?
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The 36 is a stock motor and I just wants a little more sound out of the decent stock exhaust system I already had. So I had from the canister muffler back replaced. Not a huge difference at idle, but a little more punch (sound wise) when you get on it. I'll try and take some video at lunch today.
 
Tinker said:
The 36 is a stock motor and I just wants a little more sound out of the decent stock exhaust system I already had. So I had from the canister muffler back replaced. Not a huge difference at idle, but a little more punch (sound wise) when you get on it. I'll try and take some video at lunch today.
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Yeah now I getcha . Flatties sound awesome no matter how ya runnem I think.And YES loud is not always good. I swapped bikes one day with my buddy who had a really loud HD half hour later I was all done with that crap:(
 
I love the sound of the truck at idle, the days of being heard driving 4 blocks away are over for me :]... well in a street car anyways.
 
I learned a long time ago that loud, "open exhausts" don't actually make a vehicle run better.. In fact, the fuel mileage can actually be lower because the driver has his foot stuck in it all the time, so he can enjoy the "hay look at me" factor..
I forgot to make mention in my earlier posting that my manifolds are stock '36, log style. The 2" head and tail pipes were custom bent by a local muffler man..
My 59 AB engine is over bored .60, has a Weber F1 cam and 9.5/1 compression using 59AB heads that have been extensively modified.. Many years ago I had Offy heads on the engine, went they went to he** I had the stock type heads built for the engine..
As mentioned by other contributors to this thread, the smaller the exhaust pipes, the sharper the tone, i.e., a cracking, raspy pitch, in lieu of a deeper rumble..
During the last several years it has been found that the larger the exhaust pipe (s), the better the engine performs. I had 3" pipes put on my pickup with a chambered truck muffler, improved my fuel mileage by 3. mpg.. No offensive sound was created.. A friend of mine put 3" pipes on his pickup with no muffler.. His mileage went down.. When the truck went by my house it sounded terrible... He did gain the "look at me factor"... Spent $350. for nothing..
 
mirage>>>What do you mean by black pipe? Like for natural gas plumbing in buildings? And if so what the hell does that weigh? >>>That iron pipe must weigh a ton! >>>


Nah. 1-1/2" diameter gas pipe is less than 3-lbs per foot. Throw in a few pounds worth of elbows & unions and it's still not much. I suppose if you thought your flathead might sound and breathe better with 4" thickwall sewer pipe, that might get you up a quarter ton or so. 8^)

Jack E/NJ
 
Jack E/NJ said:
mirage>>>What do you mean by black pipe? Like for natural gas plumbing in buildings? And if so what the hell does that weigh? >>>That iron pipe must weigh a ton! >>>


Nah. 1-1/2" diameter gas pipe is less than 3-lbs per foot. Throw in a few pounds worth of elbows & unions and it's still not much. I suppose if you thought your flathead might sound and breathe better with 4" thickwall sewer pipe, that might get you up a quarter ton or so. 8^)

Jack E/NJ
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I'm a plumber and I'd like to see pictures of that.
 
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