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#1176 |
Registered User
Join Date: Jun 2018
Location: Texas
Posts: 1,353
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Re: TA_C10: Stage 1
So here is the first result from my app driving around before I put these resonators on. Then I used the resonator spreadsheet I found online(from Lawrence Tolman(LT) from his youtube channel, powernation trucktech guy).
I ran several tests and the average number was 116Hz. So I plugged that into the calc. My drone is around 1700 RPM mostly so I used the 35" number for length. I went exactly 35". .
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TA_C10 Stage 1 build - http://67-72chevytrucks.com/vboard/s....php?p=8333444 "It's only money". ![]() Last edited by TA_C10; 04-15-2022 at 11:28 AM. |
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#1177 |
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Join Date: Jun 2018
Location: Texas
Posts: 1,353
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Re: TA_C10: Stage 1
And here is the result, the best I could get it. It dropped from -15 to -20 db almost. So the drone is still there, but quieter. I was expecting it to be completely cancelled. If you guys have any suggestions let me know.
I lengthened the pipe with my clamps, playing with several different configurations. I also shortened the pipe by turning the 2" capped end's 180 degree and putting them in the clamps backwards. But that shorted it probably down to like 25-28" and if you look at the spreadsheet, longer should have worked better than shorter. Nothing worked except the original 35" I originally built them to, which the Hz is still the same pretty much, but the db's went down. I dunno..... .
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TA_C10 Stage 1 build - http://67-72chevytrucks.com/vboard/s....php?p=8333444 "It's only money". ![]() |
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#1178 | |
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Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,966
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Re: TA_C10: Stage 1
Quote:
Are you happy w/it as-is or are you going to keep @ it?
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#1179 | |
Registered User
Join Date: Jun 2018
Location: Texas
Posts: 1,353
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Re: TA_C10: Stage 1
Quote:
https://docs.google.com/spreadsheets...gid=1183590515 .
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TA_C10 Stage 1 build - http://67-72chevytrucks.com/vboard/s....php?p=8333444 "It's only money". ![]() |
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#1180 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,966
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Re: TA_C10: Stage 1
Quote:
My thought is still make the 'T' into the main exhaust lines. Weld a 90° turn on the 'T'. Make a short (~3"L) 'end piece'. Use the wrap-around style exhaust clamps (2x clamps @ each assembly so 4x total) to secure varying lengths of pipe between the 90° & the end piece. What size tubing did you wind up using?
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#1181 |
Registered User
Join Date: Jan 2011
Location: Northern CA
Posts: 163
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Re: TA_C10: Stage 1
This might hide the drone?
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1970 k20 6.0l/nv4500/np205/14bff in progress build linkhttp://67-72chevytrucks.com/vboard/s...d.php?t=677014 |
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#1182 |
Registered User
Join Date: Jan 2011
Location: Northern CA
Posts: 163
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Re: TA_C10: Stage 1
Seriously though,i wonder if distance from the motor is an issue? Or if they need to be after the flowmasters to cancel their noise?
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1970 k20 6.0l/nv4500/np205/14bff in progress build linkhttp://67-72chevytrucks.com/vboard/s...d.php?t=677014 |
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#1183 | |
Registered User
Join Date: Jun 2018
Location: Texas
Posts: 1,353
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Re: TA_C10: Stage 1
Quote:
Yeah I will probably cut it down again too 10" or so and with my 3" adjustability try that new length from the second spreadsheet I found.
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TA_C10 Stage 1 build - http://67-72chevytrucks.com/vboard/s....php?p=8333444 "It's only money". ![]() |
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#1184 |
Registered User
Join Date: Jun 2018
Location: Texas
Posts: 1,353
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Re: TA_C10: Stage 1
![]() Everything I read was closer to motor the better. Says the exhaust frequency starts from motor. But if the mufflers are what is changing the note causing the drone then that makes sense. The magnaflow kit with quarter wave resonator built in is installed on the muffler itself, it's on the front of muffler, inlet side, not sure here...
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TA_C10 Stage 1 build - http://67-72chevytrucks.com/vboard/s....php?p=8333444 "It's only money". ![]() |
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#1185 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,966
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Re: TA_C10: Stage 1
Quote:
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#1186 |
Registered User
Join Date: Jun 2018
Location: Texas
Posts: 1,353
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Re: TA_C10: Stage 1
oops, I said 2.5" tubing.... I used 2" not 2.5".
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TA_C10 Stage 1 build - http://67-72chevytrucks.com/vboard/s....php?p=8333444 "It's only money". ![]() |
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