Ism exhaust resonator options

Topic: Ism exhaust resonator options (Read 3421 times) previous topic - next topic

Re: Ism exhaust resonator options

Reply #25 – May 17, 2021, 10:27:48 pm

Scott, not trying to change this thread, but if you really want to cool down the bedroom....

I also did the Dynamat insulation. I removed the stock heat blanket, fully lined everything with Dynamat, then put the stock blankets back on. On the inside, I removed all the carpet and black mat, lined the entire bedroom floor and bed pedestal with the Dynamat, then put in new pad and carpet.
The difference is noise is really good, but the heat difference is amazing. We get no noticeable heat from the engine compartment any more. Glad we did it.

The above is from a different thread.

Re: Ism exhaust resonator options

Reply #26 – May 17, 2021, 10:56:03 pm

Quote from: MarkC – May 17, 2021, 10:27:48 pm

Scott, not trying to change this thread, but if you really want to cool down the bedroom....

I also did the Dynamat insulation. I removed the stock heat blanket, fully lined everything with Dynamat, then put the stock blankets back on. On the inside, I removed all the carpet and black mat, lined the entire bedroom floor and bed pedestal with the Dynamat, then put in new pad and carpet.
The difference is noise is really good, but the heat difference is amazing. We get no noticeable heat from the engine compartment any more. Glad we did it.

The above is from a different thread.

Mark I had previously added extra insulation when I removed the carpet and installed vinyl planking. Added a inch to the inside of the coach and a inch under the mattress. I will eventually work my way into the engine compartment but not till the end of summer. Took off today June ,July, August. Yes more insulation is always a plus in my world. Just can't catch every ball since I purchase our coach. So much to do! So I ordered a 30" magnaflow XL. It will arrive on the 20th so will start that project then and hopefully will have other projects completed. We depart near June 1st when DW is out of school. Fourdaysoff Jim has some extra 5" bends and should be able to salvage enough to do a decent install.
Scott

Re: Ism exhaust resonator options

Reply #27 – May 17, 2021, 11:22:50 pm

Scott will the 30 inch muffler be quit a bit quieter than the 20 inch muffler.
Peter

Re: Ism exhaust resonator options

Reply #28 – May 17, 2021, 11:33:35 pm

Actually laughed out loud. I have no clue, but it's 50% larger. I have between the current muffler and the Crome tailpipe 40+" so there is enough room possibly with a small off set in the rear. Will know more once it's in my hand. Was really trying to hold off doing it but twice across the states is being incentive to get it done. I like the price of the Jones xl but I've kinda learned over the years you get what you pay for. It's also double the weight, maybe it will last longer?
Scott

Re: Ism exhaust resonator options

Reply #29 – May 18, 2021, 10:04:21 pm

Scott, am anxious to hear your results. I would change out the "barrel" in a heartbeat if I knew I could find something to stay relatively quiet. I have been in parks when rigs with the resonators have pulled out and they are for sure noticeable. I want the extra performance but not the extra noise even if I can't hear it from the drivers seat.

Safe travels and good luck on your trip !

Re: Ism exhaust resonator options

Reply #30 – May 19, 2021, 02:57:27 pm

Just order a 30 inch Magnafow this morning.

Re: Ism exhaust resonator options

Reply #31 – May 19, 2021, 05:30:49 pm

Sho

Quote from: oldguy – May 19, 2021, 02:57:27 pm

Just order a 30 inch Magnafow this morning.

Should of waited couple of days till I figure out how much of a pain it will be
Scott

Re: Ism exhaust resonator options

Reply #32 – May 21, 2021, 06:52:46 pm

So got home and box was on porch. Beat up a bit. One small ding in the side of the muffler and a end flange bent, but fixable. I look inside and to my surprise my 5 inch muffler is necked down to 4 inches for the length of the muffler then back up to 5 to exit. Thought I had bought a five inch muffler. Not what I thought I had purchased at all. Does anyone who purchased the Jones know what the inside pass threw diameter is? Curious if it is necked down also. It certainly will make it quieter but concerned about the additional back pressure.this is a 35% restriction.
Scott

Re: Ism exhaust resonator options

Reply #33 – May 21, 2021, 07:14:20 pm

Hey Scott, just as an FYI, in my former life I did a bit of work with high performance diesels in the pickup market. We were able to make 800+rwhp through 4" exhaust, so I doubt it's going to cost you power.

Re: Ism exhaust resonator options

Reply #34 – May 21, 2021, 10:21:02 pm

Scott does it look as some of the exhaust gas could go around the center of the muffler. I think I read something about that.

Re: Ism exhaust resonator options

Reply #35 – May 21, 2021, 10:26:12 pm

Quote from: dsd – May 21, 2021, 06:52:46 pm

I look inside and to my surprise my 5 inch muffler is necked down to 4 inches for the length of the muffler then back up to 5 to exit. Thought I had bought a five inch muffler.

I warned about this fact in two previous "resonator" threads, but I guess you didn't get the memo. Sorry about that.

Resonator (Reply #2)

Current resonator opinions (Reply #36)

I agree with Keith (above). Try measuring the O.D. of your exhaust pipe where it exits the turbo. If it is 4" then the 4" core on the Magnaflow won't matter.

Re: Ism exhaust resonator options

Reply #36 – May 22, 2021, 12:01:01 am

Okay I agree that it is equal or bigger than the turbo restrictions itself. I also know the convergent and divergent cones will dynamically change the airflow speeds and disrupt noise transmission making it quieter. I'm also confident that it will flow better than the current muffler. I also know it is in my possession and the Jones XL arrival will happen when I'm in Michigan, thus being worthless to me for this trip. It's going on next couple of days. Chuck yes you made clear representation of what I discovered. Seems like I've been too busy chopping, no time to sharpen my axe.

Peter this picture makes it look tapered , it is a straight 4 inch inside. Keith thanks for the help. Couple weeks it will all be behind me.
Scott

Re: Ism exhaust resonator options

Reply #37 – May 22, 2021, 12:28:26 am

Thanks for the picture, I see what I will be getting.

Re: Ism exhaust resonator options

Reply #38 – May 22, 2021, 02:32:38 pm

So in researching Keith seems to be correct. The temperature post the turbo has had a lot of energy extracted mechanically and is rapidly cooling. In cooling it is shrinking and you could actually have a convergent cone all the way to exit point and still have the same flow resistance. Still rapping my head about all of it and pushing forward with install. I'm sure I'm my own worst enemy. Also was told at he same time that a EGT would be beneficial on the long pulls pre turbo to help self regulate right foot issues. Higher rpm, lower power setting will help. Never ending
Scott

Re: Ism exhaust resonator options

Reply #39 – May 22, 2021, 02:36:20 pm

Scott, pre-turbo vs post-turbo EGT can vary dramatically. When we used to test this, we could see from nothing (at low boost/drive pressures) to as much as 400*F temp differences. This is why my EGT thermocouple is in the exhaust manifold...where the quick transient heat measurement will be...between the engine and the cork (turbo). The higher the drive to boost pressure ratio, the larger the difference in EGT measurements generally.

Re: Ism exhaust resonator options

Reply #40 – May 24, 2021, 09:13:29 pm

Started/finished install today of the 30 inch magnaflow. Needed the one 90 deg tube I got form fourdaysoff Jim (Thank You) and reused everything else I needed. So I did not touch the flex pipe and was able to pull the 45deg tube out of the muffler. Installed the 45 to the new 90 on opposing ends. 45 goes into flex. Cleaned the tailpipe and rotated in counterclockwise so as exhaust does not blow up dust in driveway any more. The resonator was not designed for clamps to I welded it to the tubes. FYI the old exhaust is quite heavy. I used a floor jack and a block of wood. Once on the ground it was a pain just to drag out. Actually used my forklift once out to put on work bench so I could fight with the pipes and removed, however I didn't use the in the end. Built a new mount out of 2" 1/4 strap and utilized the original rearward mount. Also added a four inch section to the end for the original tailpipe and put a little offset to help cleat the condenser. Will roll a stainless heat shield hand attach in the future.. sound acceptable to me so far. Anyone need/want a good stock muffler PM me and we'll make arrangements to get it to you.
Scott

Re: Ism exhaust resonator options

Reply #41 – May 24, 2021, 09:43:14 pm

DSD
You could try this??
Exhaust Pipe Heat Shield Insulation - Heatshield Products

Re: Ism exhaust resonator options

Reply #42 – May 24, 2021, 09:48:29 pm

Quote from: master2301 – May 24, 2021, 09:43:14 pm

DSD
You could try this??
Exhaust Pipe Heat Shield Insulation - Heatshield Products

I could but I have at home about 200 lbs of stainless sheets. I'll just cut and roll one about the size of the resonator and make some standoffs and just hose clamp it on. Almost welded some nuts to the resonator for mounts. Would be relatively easy to remove and do that still. Will address when we get back from Michigan in a couple of weeks.
Scott

Re: Ism exhaust resonator options

Reply #43 – May 24, 2021, 10:42:44 pm

EGT should be measured as close to the exhaust port as possible. Best would be to have a probe in the exhaust manifold for each cylinder. All cylinders will not have the same EGT. This is exactly what is done in aircraft.

Photo shows the EGT for all 4 cylinders in our aircraft. Note that I'm 150 rpm over redline. 1343° F is the hottest cylinder. You can see #3 has the highest EGT while #2 has the highest cylinder head temperature.

Pierce

Re: Ism exhaust resonator options

Reply #44 – May 24, 2021, 10:55:55 pm

Quote from: Pierce & Gaylie Stewart – May 24, 2021, 10:42:44 pm

EGT should be measured as close to the exhaust port as possible. Best would be to have a probe in the exhaust manifold for each cylinder. All cylinders will not have the same EGT. This is exactly what is done in aircraft.

Photo shows the EGT for all 4 cylinders in our aircraft. Note that I'm 150 rpm over redline. 1343° F is the hottest cylinder. You can see #3 has the highest EGT while #2 has the highest cylinder head temperature.

Pierce

I'm comfortable just having the average going into turbo. On the list when I get back. Will be going on Interstate 70 thru Colorado and will keep the rpms up and power reduced till I can see what's going on. Use on my daily driver. Power back on the pulls and wait longer for temps to drop stopping for fuel typically.
Scott

Re: Ism exhaust resonator options

Reply #45 – May 25, 2021, 11:02:34 am

Quote from: master2301 – May 24, 2021, 09:43:14 pm

DSD
You could try this??
Exhaust Pipe Heat Shield Insulation - Heatshield Products

Wish the price was less. Good looking stuff.
Scott

Re: Ism exhaust resonator options

Reply #46 – May 26, 2021, 09:06:24 pm

My Resonator arrived today, one day earlier than they said it would. Scott when I saw you welded in
extensions I wondered how you could get away welding with steel rod and now I know why, the end
pieces are steel so there is no sense using stainless pipe and elbows.

Re: Ism exhaust resonator options

Reply #47 – May 27, 2021, 12:32:03 pm

I thought about replacing but mine are like brand new. Next time for sure. Stainless welds to mild steel without issue.
Scott

Re: Ism exhaust resonator options

Reply #48 – May 27, 2021, 04:16:37 pm

I don't think it would make any sense using stainless pipe when the ends of the resonator are mild steel.

Re: Ism exhaust resonator options

Reply #49 – May 27, 2021, 11:38:41 pm

The stainless pipe won't corrode and will be much easier to remove from a steel fitting down the road. Stainless pipe probably has not gone up as much as steel products. I got sticker shock a couple of weeks ago for a length of .125 wall 1"x2" that normally costs me about $23 was $77. Most Euro cars today have all stainless exhaust systems including the exhaust manifolds. They last forever.

Pierce

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