Need Help With Exhaust Cutout Fab

[BarnBuiltBeaters]

I am building a diesel truck and would like an exhaust cutout. Seems to me cutouts are really only a gasser thing, many of which would be too small for diesel exhaust.
I am looking to build one myself but do not know what to use for the motor. I know there are many different DC motor types but not super familiar with the differences. I am also not sure how to control it to spin only 90 deg CW and CCW (Open/close).
There are two approaches, turn it 90 degrees or have it hit a hard stop and stall. However I am not sure the negative impacts stalling a DC motor would have. does anyone have any ideas on what type of electric motor to use, how to keep it at 90 degrees and/or other ideas?

Here is one 5" cutout I see but sold out and also 300 dollars...too much. Here they are using an electric motor and stalling it out where it shuts off.
I can buy the motor from QTP at 75 dollars which also seems a bit seem for what it is, maybe it isnt?
I was thinking I need an HVAC Damper motor as these turn 90 deg with pwr applied. These run at 24V and am worried about the heat next to the exhaust. What type of motor are these?

 

[kbeefy]

You could get a motor with limit switches inside to control its range of movement.

You could rig up a linkage like a windshield wiper transmision that doesn't need to reverse.

 

[BarnBuiltBeaters]

What do I search for motor with integrated limit switches? I have tried to look for this and cant find it

You could get a motor with limit switches inside to control its range of movement.

You could rig up a linkage like a windshield wiper transmision that doesn't need to reverse.

 

[kbeefy]

no clue, not something I've ever done.

I know people often save broken window regulators for random automation projects.

 

[rsanter]

Why do you want them?
You want the sound? You want the better flow?

For sound the cutout does not need to be the same size as the pipe

For flow you could put two next to one another....

 

[tarbellb]

Trying looking up "servo", they tend to have limits ie 90, 180, etc.. and rated push/pull strength.

Many are rated for extreme environments, I can only point you to lower voltage stuff like >12v

 

[no704]

RC car servo could do this easy, with a test board to actuate it. Not sure they would love the heat but they are really cheap.

 

[Half-fast eddie]

You could use a push-pull linkage

 

[tarbellb]

You could use a push-pull linkage

RC car servo could do this easy, with a test board to actuate it. Not sure they would love the heat but they are really cheap.

Exactly what I was thinking, RC (radio control) servos put out lots of power and are pretty robust.
---
Cable linkage= old school method, pretty bulletproof, how my buddies Chevelle operated

 

[zkdiesel]

Repurpose an exhaust brake with an air cylinder.......

 

[BMWBOB]

I had a straight pipe on my former 1ton - kinda loud, but not too bad. Didn't really seem to matter very much for power

 

[jsaw]

You could use a push-pull linkage

Back in the day, you could buy cable operated cutouts from JC Whitney

 

[BarnBuiltBeaters]

Trying looking up "servo", they tend to have limits ie 90, 180, etc.. and rated push/pull strength.

Many are rated for extreme environments, I can only point you to lower voltage stuff like >12v

I can only find 180 degree ones. Looks like I need a control board too? I was hoping to find one where if I applied 12V it would turn 90. If I applied 12V reverse polarity, it would spin 90 back. Or, have a constant 12V supply and 12V is off, it returns to a close/open state.

 

[Bigblue&Goldie]

Maybe use an electric linear actuator with some linkage. I believe those have stops.

 

[no704]

I can only find 180 degree ones. Looks like I need a control board too? I was hoping to find one where if I applied 12V it would turn 90. If I applied 12V reverse polarity, it would spin 90 back. Or, have a constant 12V supply and 12V is off, it returns to a close/open state.

You will need at minimum a test controller, like $10 on Amazon you can set in any number of degrees.

 

[no704]

Or you could use an air cylinder. Not a desil guy, but I assume they make some manifold vacuum?

 

[isb cornbinder]

I installed a QTP exhaust tuner on my 1940Ford. I mounted the control switch behind the speaker grill.

 

[BarnBuiltBeaters]

Or you could use an air cylinder. Not a desil guy, but I assume they make some manifold vacuum?

I can tell you aren't a diesel guy haha. They make ZERO vacuum as they have no throttle blades. Pretty weird right! Hence the reason why they need hydroboost brake master cylinders. I believe a few older diesels had throttles.

I installed a QTP exhaust tuner on my 1940Ford. I mounted the control switch behind the speaker grill.

That is pretty slick! do you get any leakage from the cutout? I thought about buying a cutout, disassembling it, having my buddy machine me the butterflyhousing, and reassembly with a larger butterfly.

 

[Grimpala]

I hate to be 'that guy' but once you factor in time, fabrication materials, parts, testing and possibly screwing something up, $300 isn't that bad of a deal for proven tech.

 

[BarnBuiltBeaters]

I hate to be 'that guy' but once you factor in time, fabrication materials, parts, testing and possibly screwing something up, $300 isn't that bad of a deal for proven tech.

You do have a point however since this isn't my job I dont value my time doing things I enjoy.

You are speaking to a guy who hand ground his 750sqft garage with a 4inch angle grinder in prep for epoxy floors haha....never again. All to save a couple bucks. oh, and I used bubble wrap for knee pads haha.

 

[kerrynzl]

Years ago I used a pair of 3" water valves on the end of dump tubes that exited under the floor. [with the handles inside the passenger compartment just in front of the bench seat]

It was the coolest thing ever for a 16 year old "street racer", all I had to do was reach down and open the valves [to impress the gals ]

Now [46 years later] I would use a pair of 12v linear actuators to operate a lever. These can come with adjustable limit stops
I would also consider vulturing parts from a throttle body