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| Exhaust sizing https://slantsix.org/forum/viewtopic.php?t=41044 |
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| Author: | oklahoma joe [ Wed Jul 14, 2010 3:28 pm ] |
| Post subject: | Exhaust sizing |
I am about to put a exhaust system on my car (1898 slant w 8.9 compression). I was wondering what size pipe is best 2", 2 1/4"or 2 1/2". I can't afford the mandrel bent stuff so Its going to be a knock off flow master and a standard bending machine. oh yea single exhaust. thanks Joe |
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| Author: | Joshie225 [ Wed Jul 14, 2010 3:59 pm ] |
| Post subject: | |
Can you tell us more about the engine's state of tune? Is it stock or modified? Even a stock 198 can make good use of a 2 1/4" pipe. I don't like chambered mufflers as they tend to resonate/drone at highway speeds. |
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| Author: | sandy in BC [ Wed Jul 14, 2010 5:12 pm ] |
| Post subject: | |
You wont go wrong with 2 1/4". |
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| Author: | oklahoma joe [ Wed Jul 14, 2010 7:32 pm ] |
| Post subject: | |
It has a mild cam that works best around 1800 to 4500 rpm. and has a super six setup with a BBD off of a v-8. If has been ported and gasket matched. but pretty much stock besides that. I am going to take it to a muffle shop tomorrow. Finally found a guy that sounds like he knows what he is talking about and is reasonable. Thanks Joe |
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| Author: | Aggressive Ted [ Wed Jul 14, 2010 9:01 pm ] |
| Post subject: | |
Another vote for 2.25" pipe. It worked well on my mild build. Hopefully this guy carries thick wall aluminized coated steel pipe. It bends very well, no wrinkles and doesn't rust. The thin wall stuff from Midas Muffler shops will start rusting the next day here in the Northwest..... |
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| Author: | wjajr [ Thu Jul 15, 2010 4:21 am ] |
| Post subject: | |
(1898 slant w 8.9 compression). Wow, an early block! LOL I’ll second Josh’s droning comment. I have Turbo mufflers, still can’t figure why they are called mufflers, and the drone is unbearable mid 2000 rpm range on a long trip… Let us know wow the new system sounds & performs. |
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| Author: | oklahoma joe [ Thu Jul 15, 2010 5:39 pm ] |
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dropped her off this afternoon and the guy is going to put on a new exhaust flange and head tube out of 2 1/4" to the muffler. and 2" from the muffler to the rear and a knock-off Flowmaster. Hopefully be able to pick it up tomorrow after work. VRoom vroom! joe |
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| Author: | Aggressive Ted [ Thu Jul 15, 2010 11:05 pm ] |
| Post subject: | |
I ran that combo for several years and it got very good mileage! I am now running a 2.25" diameter long body Magna Flow muffler with 2.5" a internal tube with a nice 22" long 2" resonator, which makes it very very quiet system with no hint of a drone at all. |
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| Author: | Doc [ Fri Jul 16, 2010 9:09 am ] |
| Post subject: | |
Quote: ... and a knock-off Flowmaster.
Flowmasters are a chamber style muffler... it will likely "drone" as discribed above. A big "reverse flow" muffler is the way to go if you want the avoid a drone. If the work is done, give it a test drive and don't be afraid to tell them to change-out the muffler, if you do not like the sound quality. (If you find yourself saying: "I think I can live with that..." have them change it! ) DD |
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| Author: | Greg Ondayko [ Fri Jul 16, 2010 9:13 am ] |
| Post subject: | Re: Exhaust sizing |
Quote: (1898 slant w 8.9 compression).
thanks Joe ha ha everyone presses the wrong button sometimes. That dere must be one of dem steam slant 6 engines.... Greg |
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| Author: | oklahoma joe [ Fri Jul 16, 2010 6:25 pm ] |
| Post subject: | |
Did You konw you olny need the frist and lsat letetr in the wrod to be albe to unedrstnad egnlish. Ok it's a 198 not a 1898. But I got the car back tonight and it sounds good no droning I was a bit scared of that happening. The muffle guy did a pretty good job for $200 buck got a new 2 1/4" flange, 2 1/4" pipe from the exhaust manifold back and 2 1/4" pipe back past the axle, then he reduced it to 2" pipe for the last 30 some inches. It sounds great at idle, and I mean great, and has hardly any sound while cruising at about 55 to 60. (2200rpm) It does a little thing I have to get used to. Under hard acceleration (4000 rpm) just before she shifts it sounds a little like a british sports car. Other than that I am happy. I will get a video of it and upload it. Joe |
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| Author: | oklahoma joe [ Sat Jul 17, 2010 6:03 pm ] |
| Post subject: | |
here is a video Video Joe |
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| Author: | 66aCUDA [ Sun Jul 18, 2010 6:16 am ] |
| Post subject: | |
Joe That sounds Great. Looking great btw. Looks like your about ready for the trim I have as well. Frank |
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| Author: | Dart270 [ Mon Jul 19, 2010 5:59 am ] |
| Post subject: | |
Sweet car and sounds great! Lou |
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