Tube size/wall for trans mount
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Tube size/wall for trans mount
Gonna make a new trans x-member for a 2nd gen s10, it's a manual 2.2 so no big load but gonna drag it some. What size tube & wall should I use? I understand more od is stiffer than wall thickness.
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If I didn't overthink stuff I wouldn't be on speedtalk!
Re: Tube size/wall for trans mount
Seriously, couldn't get an answer on YB either LOL Ah well I'll use 1-3/4 .120
Channel About My diy Projects & Reviews https://www.youtube.com/c/BOOTdiy
I know as much as I can learn and try to keep an open mind to anything!
If I didn't overthink stuff I wouldn't be on speedtalk!
I know as much as I can learn and try to keep an open mind to anything!
If I didn't overthink stuff I wouldn't be on speedtalk!
Re: Tube size/wall for trans mount
That seems way plenty....but i've never build one so I didn't what to comment. If you have room, going up to 2" would let you drop the wall to .060 and have almost exactly the same strength but just over 1/2 the weight...bending strength is dia^4 so a small increase goes a very long way.
Mark
Mechanical Engineer
Mechanical Engineer
Re: Tube size/wall for trans mount
We used to buy tubular tranny mount kits from W/JCW years ago, but I don't know if they still sell them or not?
The kits were in with their engine transplant parts.
Back then the tubular tranny kits were so cheap that I would have been hard pressed to make one..
At one time we could buy almost everything but headers from them to put any engine into any vehicle! The Jeep conversions were way helpful...
Totally off topic, but our beloved old SBC engines have three cast-iron exhaust manifolds that allow installation of it in about anything.
Early top 265 and later V-8 Monza top logs, ramshorns, and finally the bottom logs. And if you look, you will find truck and 'Vette stainless steel tubular header type exhaust manifolds too..
pdq67
The kits were in with their engine transplant parts.
Back then the tubular tranny kits were so cheap that I would have been hard pressed to make one..
At one time we could buy almost everything but headers from them to put any engine into any vehicle! The Jeep conversions were way helpful...
Totally off topic, but our beloved old SBC engines have three cast-iron exhaust manifolds that allow installation of it in about anything.
Early top 265 and later V-8 Monza top logs, ramshorns, and finally the bottom logs. And if you look, you will find truck and 'Vette stainless steel tubular header type exhaust manifolds too..
pdq67
Re: Tube size/wall for trans mount
idk bout 2" or larger, .060 is pretty much 16ga exhaust pipe(I'm sure the steel is better than exhaust pipe but just saying)
I've seen a few decent kits on ebay, summit, or speedway for example https://www.speedwaymotors.com/Speedway ... ,4219.html Most kits don't say the tube size or wall(that one does). I got time so I like to explore options and often something turns out a bit better if you make it yourself. I can get some straight pipe cheap n bend it at a friends as well, cheaper would be nice as I am limiting myself to a very tight budget. I've had a few sbc s10's and used manifolds for one because it was easy, this 2.2 is more of a personal challenge.
Also doing the exhaust myself so I'll just have to wait n see if I even need to bend any.
I've seen a few decent kits on ebay, summit, or speedway for example https://www.speedwaymotors.com/Speedway ... ,4219.html Most kits don't say the tube size or wall(that one does). I got time so I like to explore options and often something turns out a bit better if you make it yourself. I can get some straight pipe cheap n bend it at a friends as well, cheaper would be nice as I am limiting myself to a very tight budget. I've had a few sbc s10's and used manifolds for one because it was easy, this 2.2 is more of a personal challenge.
Also doing the exhaust myself so I'll just have to wait n see if I even need to bend any.
Channel About My diy Projects & Reviews https://www.youtube.com/c/BOOTdiy
I know as much as I can learn and try to keep an open mind to anything!
If I didn't overthink stuff I wouldn't be on speedtalk!
I know as much as I can learn and try to keep an open mind to anything!
If I didn't overthink stuff I wouldn't be on speedtalk!
Re: Tube size/wall for trans mount
I built a whole race car using 0.028". I also build a car car like thing from exhaust tubing once. Just saying
Modern chassis are sheetmetal. They work because the whole surface is loaded making the load everywhere small. With tubing stuff you look at how much load, what will fit, and also will it see livsl impacts that cause dent or damage the tube. With thin wall tubing the weight is proportional to diameter but bending strength is proportional to dia^4, so strength hoes up WAY faster than weight as you increase dia....then you can tb in it out to the strength you need and have a much lighter design.
Just to hold up the trans behind a 2.2l.... I wouldnt think twice about using 2" exhaust tubing unless you need to put holes or notches in it, then the areas around the holes and notches will need more metal.
Modern chassis are sheetmetal. They work because the whole surface is loaded making the load everywhere small. With tubing stuff you look at how much load, what will fit, and also will it see livsl impacts that cause dent or damage the tube. With thin wall tubing the weight is proportional to diameter but bending strength is proportional to dia^4, so strength hoes up WAY faster than weight as you increase dia....then you can tb in it out to the strength you need and have a much lighter design.
Just to hold up the trans behind a 2.2l.... I wouldnt think twice about using 2" exhaust tubing unless you need to put holes or notches in it, then the areas around the holes and notches will need more metal.
Mark
Mechanical Engineer
Mechanical Engineer
Re: Tube size/wall for trans mount
Who had the AA/FA with a, "muffler moly", frontend on it??
I think the story was that the front was always getting dinged so it was easier to fix tailpipe than real moly frame tubes...
pdq67
I think the story was that the front was always getting dinged so it was easier to fix tailpipe than real moly frame tubes...
pdq67
Re: Tube size/wall for trans mount
I would 1 1/2 x.125 dom. I have tried the larger dia. and thinner pipe, It doesn't work as good as the smaller thicker pipe.If space was a problem I would use 1 1/4 x.125 dom and add some small braces or gussets.
Re: Tube size/wall for trans mount
Just curious, was there a problem with the larger, thinner tubing? or was it just a lot easier to work with heavier wall tubing? Or something else?
Mark
Mechanical Engineer
Mechanical Engineer
Re: Tube size/wall for trans mount
Some gussets or bracing is always a nice addition, I've herd of some bolt-in tube cross members sagging once the load was placed on them for certain cars.
Channel About My diy Projects & Reviews https://www.youtube.com/c/BOOTdiy
I know as much as I can learn and try to keep an open mind to anything!
If I didn't overthink stuff I wouldn't be on speedtalk!
I know as much as I can learn and try to keep an open mind to anything!
If I didn't overthink stuff I wouldn't be on speedtalk!
Re: Tube size/wall for trans mount
That is the reason for larger diameters or taller general profile, they are much more rigid for the same weight. But smaller thicker tubes are easier to fit and work with so that tends to be the preference if weight is not really a concern. Also bends are bad, notches in the top of bottom are bad, holes are usually not too bad unless they are removing more than 50% of the material or are not centered up/down. just general fabrication good practice rules.
Mark
Mechanical Engineer
Mechanical Engineer
Re: Tube size/wall for trans mount
I've still not measured it really or checked how the exhaust will run. Bout 3 feet and might not need a bent or only one side for the single exhaust pipe. Kinda leaning towards larger tube size n dual bends incase I v8 or v6 it later, but if I can get away with straight for now I'll do that later.
Channel About My diy Projects & Reviews https://www.youtube.com/c/BOOTdiy
I know as much as I can learn and try to keep an open mind to anything!
If I didn't overthink stuff I wouldn't be on speedtalk!
I know as much as I can learn and try to keep an open mind to anything!
If I didn't overthink stuff I wouldn't be on speedtalk!
Re: Tube size/wall for trans mount
With the larger dia. thinner tube once you start adding tabs ,welding, etc..It would fail at those points.I know the argument would be to redesign the mounts to spread the load or you are not welding correctly but those did not work as good as adding mass back in to the pipe.