05-27-2015, 11:30 PM | #251 |
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Re: Project 68 k10 LWB..aka "The Hulk"
How do you think it would sound? Would dual sound better?
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1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD* GO GO!!! Last edited by First c10; 05-27-2015 at 11:41 PM. |
05-27-2015, 11:37 PM | #252 |
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Re: Project 68 k10 LWB..aka "The Hulk"
According to this a 3" pipe would handle 339 hp.
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1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD* GO GO!!! |
05-28-2015, 03:54 AM | #253 |
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Re: Project 68 k10 LWB..aka "The Hulk"
probably sound a little deeper than a stock single exhaust due to diameter, but what mufflers of course is the variable.
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05-28-2015, 09:29 AM | #254 |
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Re: Project 68 k10 LWB..aka "The Hulk"
Magnaflow, flow master, those are the popular ones right? I looked on YouTube but really can't find anything but catback systems for single exhaust so that tells me true duals would be the best.
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1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD* GO GO!!! |
05-28-2015, 11:11 AM | #255 |
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Re: Project 68 k10 LWB..aka "The Hulk"
Since I am at this point right now in my build I have done a lot of looking regarding pipe size/headers etc. One thing I have read and heard over and over is don't go too big or it will rob torque. Velocity is also a key factor and if pipes are too large velocity is lost. Outside of that each engine hp combo is different.
I will be using 2.5" pipes to accommodate upgrades to the motor in the future, but that is probably even a little big for my 6.0L with roughly 328hp. Just my 2 cents Chris
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05-28-2015, 11:59 AM | #256 | |
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Re: Project 68 k10 LWB..aka "The Hulk"
Quote:
On my sons 5.3 LC9 we went with 2.5" duals with 40 flowmasters. The stock motor was 320 HP before doing anything to it. Not sure if it would have been better to go with 2.25 or not. with the tune and upgrades it runs strong. What do you think on running two 2-1/2" in to one 3"? pros/cons??? Thanks Scott
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05-28-2015, 12:35 PM | #257 |
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Re: Project 68 k10 LWB..aka "The Hulk"
Only one way to find out give it a try. I ran 3" duel exhaust 40 series Flow masters in my 84 Chevy 454 engine about 300 hp and it worked good at idle it was quite at full throttle I gat a couple of tickets. I installed 3" exhaust in my 73 Plymouth 390 stroker motor and it is way to loud at idle or full throttle. for my 71 Chevy I installed 2-1/2" duel exhaust with Magna Flow mufflers it will be a while before I get it running. Then theirs my Ram 2500 4" single exhaust straight pipe with tuner and it runs like a bat out of hell and quite at idle not bad at full throttle.
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05-28-2015, 04:39 PM | #258 | |
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Re: Project 68 k10 LWB..aka "The Hulk"
Quote:
It is my understanding that velocity increases as the passage way reduces in size. Seems logical to me anyway. Just like reducing pipe size to increase water pressure at the outlet. For headers, I have read that 1 5/8 primaries into 2.5 collectors and staying with 2.5" duals all the way is best. But sometimes headers combos that actually fit don't help. As long as 3" is reduced to to 2.5" velocity should be effected in a good way. Honestly I am not sure about dual 2.5" into single 3". That may have a negative effect on velocity in the form of scavenging or back pressure if the 3" doesn't have enough capacity for the cfm being jammed thru it. I think 3.5 or 4" would probably yield better results but I would look to a pipe calculator to get better numbers. In general I doubt if any of us would feel the difference in our seats. I think you do the best you can with budget and what will fit your rig while trying to apply common sense.
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05-28-2015, 05:41 PM | #259 |
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Re: Project 68 k10 LWB..aka "The Hulk"
The picture below is what I was thinking. Please don't. I know I can't draw lol.
I understand the idea of high velocity in a small pipe with back pressure verse larger size less back pressure and Low velocity. The above chart reads in cfm flow and hp. So single 3" can flow 747cfm and 339 hp. That would say that the 243 heads I have on the motor need to flow 373.5 cfm each. Which I don't think this motor can do NA. The hp number is what has me puzzled. My 08 Duramax has 3.5" after the turbo and before the cat and 4.5 after thru a single muffler (can't remember the brand of the catback system ) motor is 325 hp 600+ torque stock. Probably not the same since it's an oil burner. I am just thinking it would be different. Maybe put a large nasty chrome tip on it.
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05-28-2015, 06:10 PM | #260 |
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Re: Project 68 k10 LWB..aka "The Hulk"
OK so.....
This is what my mind comes up with(based on the above chart) 2.5 pipe = an area of .034ft2 at 509cfm = 14970.6 ft/min or 249.5 fps 3.0 pipe = an area of .049ft2 at 747cfm = 15244.9 ft/min or 237.4 fps So bigger pipe more cfm but less velocity. 5% less velocity in the 3" then the 2.5" now that we have had an algebra lesson.....it all comes down to sound! What to you guys think it will sound like? good or bad?
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05-29-2015, 03:51 AM | #261 |
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Re: Project 68 k10 LWB..aka "The Hulk"
Magnaflow gets my vote, deeper sound, Flowmasters are a more raspy sound, that said i run Magnaflows on the rat. My DD originally had dual Glass packs and the system ran side by side, the packs burned out but the forward pipes were still solid so i left them and had a 2 in 2 out 70 series Flowmaster installed, but also has 2 20" resonators installed so its deeper and not as raspy sounding.
Start combing Youtube and the MFG sites for sound clips. I forget what mufflers i have but they are the largest body Magnaflows that were available, i wanted quiet after 20 years of headers and flowmaster 40's. https://www.youtube.com/watch?v=ZyYm...ature=youtu.be https://www.youtube.com/watch?v=wH4Qq3m7PPo
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05-29-2015, 11:49 AM | #262 |
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Re: Project 68 k10 LWB..aka "The Hulk"
The way I look at it is it's your sons truck make on the loud side that way you will hear him coming home late at night after party'n all night or nit
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05-29-2015, 11:21 PM | #263 | |
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Re: Project 68 k10 LWB..aka "The Hulk"
Quote:
Thanks guys I will check out videos on it. Not sure what I showing to but thanks for helping me think about it football practice is taking up a lot of time. Next week is no practice so hopefully I can get back on the truck.
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06-01-2015, 10:07 PM | #264 |
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Re: Project 68 k10 LWB..aka "The Hulk"
Hulk is coming along really nice !
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06-01-2015, 10:18 PM | #265 |
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Re: Project 68 k10 LWB..aka "The Hulk"
Thanks sleepertruck72
I haven't been able to really work on it this past couple weeks hopefully I can get on it soon.
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06-02-2015, 11:49 AM | #266 | |
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Re: Project 68 k10 LWB..aka "The Hulk"
Quote:
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06-02-2015, 04:35 PM | #267 | |
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Re: Project 68 k10 LWB..aka "The Hulk"
Quote:
I am thinking it would be different to have a large pipe exhaust. Scott
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06-02-2015, 04:41 PM | #268 | |
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Re: Project 68 k10 LWB..aka "The Hulk"
Quote:
Chris
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06-02-2015, 04:58 PM | #269 | |
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Re: Project 68 k10 LWB..aka "The Hulk"
Quote:
so what muffler would you recommend? Size? 3" or 3.5"?
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06-02-2015, 05:13 PM | #270 |
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Re: Project 68 k10 LWB..aka "The Hulk"
Also spent some money and bought HP Tuners. going to play with my others sons 5.3 LC9 truck...
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06-02-2015, 05:20 PM | #271 | |
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Re: Project 68 k10 LWB..aka "The Hulk"
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shows proof of a performance gain. I am a flomaster guy so that's what I would get. Let me know how tough the learning curve is with HP tuners. I use computers every day and have been thinking about buying and getting to know the ins and out of tuning the LS motors. Like anything, I'm sure it's a matter of understanding the user interface, but have never heard how difficult that is self teaching. Chris
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06-02-2015, 06:48 PM | #272 | |
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Re: Project 68 k10 LWB..aka "The Hulk"
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I paid about 400$ on the C10 truck tune and it still needs some trans tuning so I don't want to spend anymore money to someone else. figure I will spend it on learning material....All the tuners on this site say read ,read, read, and read some more!!! so now I just need to learn to read!!!
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1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD* GO GO!!! |
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06-02-2015, 07:30 PM | #273 |
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Re: Project 68 k10 LWB..aka "The Hulk"
I'm thinking about tuning the engine as well. I hear stories about guy and tuner blowing up engines tuning them. I'm installing wide band O2 sensor on my truck so I can keep an eye on fuel air mixture.
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06-02-2015, 07:39 PM | #274 |
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Re: Project 68 k10 LWB..aka "The Hulk"
Yes I figured I learned how to weld and do all the other mechanical stuff. It might take me a while but I should be able to get the computer stuff done. As for blowing up stuff I think that's people trying to do more with the tune then there abilities I am going to start with the easy stuff like trans shift points and such before I really start tuning anything on the k20. Understanding the terminology I think will be the toughest to learn and Understand
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06-03-2015, 04:57 AM | #275 |
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Re: Project 68 k10 LWB..aka "The Hulk"
It will sound great with a single, don't sweat the sound part too much, just run stock diameter pipes out of the headers or manifold to where they tie together, i don't know if there is a pre made collector out there or not.
Another option may be to find a dual in single out muffler, something to look into.
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