RE: Maxx Gasser Build Notes (Gas S-Maxx Conversion) Pics, Vid

RE: Maxx Gasser Build Notes (Gas S-Maxx Conversion) Pics, Vid
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RE: Maxx Gasser Build Notes (Gas S-Maxx Conver... - 3/7/2008 3:32:00 AM

cummins driver

Posts: 401
Joined: 3/3/2003
From: Lancaster, KY, USA
Status: offline

Well, it looks like no video for a while

I made my motor to tranny shaft stouter, and got the brakes working, and was gonna take it for a short drive to make sure it was gonna work ok, cause i wanted to get it reliable so it is fun to run. Well about 15 feet out i dont know what happened, but it ran away from me, and hit a wagon flat dad had sitting outside the shop. It hit right at the top of the motor, and busted the magneto and bent the frame. I knew the frame wasnt too stout, but I wasnt planning to run it into that kinda stuff either(of course, who does)

I think I will just take it all back apart, and cut the aluminum plate out for a frame and go about designing it better this time. Im going to try to make it shorter, get the driveline angles the best i can, move the tranny as far forward as i can, and go from there. It should be lighter too. My original design wasnt the best but i thought it would work until i decided to buy the stuff to do it better. Oh well. I guess I will slowly go about making it better than it was before. I will post pictures of the progress..... for the 2nd time

At least i have an idea of how it should run now.

Sorry to dissapoint everyone with no video

_____________________________

-Electric Traxxas Stampede(16t/XRS esc)
-.15 t-maxx(Undergoing Gasser conversion)

(in reply to nexzzt)

Post #: 476

RE: Maxx Gasser Build Notes (Gas S-Maxx Conver... - 3/7/2008 3:33:03 AM

cummins driver

Posts: 401
Joined: 3/3/2003
From: Lancaster, KY, USA
Status: offline

quote:

ORIGINAL: nexzzt

Nice work, can't wait to see some videos. Would the length of your chassis be the cause of the turning problems(or lack of)?

I am looking around for a new motor for my truck, in the mean time I have been fixing things that I found a little weak when running the original echo motor. The drive shaft between tranny and rear diff was one of the weak links, i solved that by going back to my original uni joints from a socket set and whipper snipper shaft. Before is was running very sloppy and lot of up / down, side to side movement so I used a plastic wheel axle for while. That broke a few times when changing into second, so I found a way to mount the socket set uni joints better and they run quite smoothly now. I also made a crude centre skid plate out of ali which has stiffened the chassis and will keep rocks etc. out of my uni joints (this was a problem before). When I get a running motor on it again i'll post some pics.

Im ready for some pictures. Sounds good

_____________________________

-Electric Traxxas Stampede(16t/XRS esc)
-.15 t-maxx(Undergoing Gasser conversion)

(in reply to nexzzt)

Post #: 477

RE: Maxx Gasser Build Notes (Gas S-Maxx Conver... - 3/7/2008 9:36:26 AM

nexzzt

Posts: 71
Joined: 8/12/2007
From: QLD, AUSTRALIA
Status: offline

quote:

ORIGINAL: cummins driver

Well, it looks like no video for a while I made my motor to tranny shaft stouter, and got the brakes working, and was gonna take it for a short drive to make sure it was gonna work ok, cause i wanted to get it reliable so it is fun to run. Well about 15 feet out i dont know what happened, but it ran away from me, and hit a wagon flat dad had sitting outside the shop. It hit right at the top of the motor, and busted the magneto and bent the frame. I knew the frame wasnt too stout, but I wasnt planning to run it into that kinda stuff either(of course, who does) I think I will just take it all back apart, and cut the aluminum plate out for a frame and go about designing it better this time. Im going to try to make it shorter, get the driveline angles the best i can, move the tranny as far forward as i can, and go from there. It should be lighter too. My original design wasnt the best but i thought it would work until i decided to buy the stuff to do it better. Oh well. I guess I will slowly go about making it better than it was before. I will post pictures of the progress..... for the 2nd time

At least i have an idea of how it should run now.

Sorry to dissapoint everyone with no video

Wow, sorry to hear that. One good thing about the spektrum gear is the fail safe, and combined with a throttle return spring it is pretty safe. Anyway, keep at it, I always find the build a little more fun than running it but it is nice to run it at least a little while. Also, if you can post some build pics as you go, I like seeing how ppl fix/get around problems etc.

(in reply to cummins driver)

Post #: 478

RE: Maxx Gasser Build Notes (Gas S-Maxx Conve... - 3/7/2008 5:39:26 PM

cummins driver

Posts: 401
Joined: 3/3/2003
From: Lancaster, KY, USA
Status: offline

Ill try to do better with the pictures this time around

I think I might lower the frame to the same level of the bottom of the center of the axles and use the 4 skid plate bolts under each differential to attatch the frame with. It seems to me with the frame lowered the truck would handle a lot better, and be a lot less top heavy. And If I go this route I am also thinking about ditching the transmission and just connecting a driveshaft from the motor to the rear differential.

The rear differential gear ratio is a 2.8:1. Does anyone know the 1st, and 2nd speeds of the trannies gear ratio?

If I could eleminate 1 driveshaft, and just have 1 really short one I think it would be a lot more reliable, and I wouldnt have to worry about the transmission either. But I need to make sure my overall gear ratio will be ok. Id like for it to go 35mph anyways. Faster would be better but, I dont want to sacrafice too much low end power and with the single speed i will have to find a happy medium.

Anyone see any problems with this design? Ill do better with the pictures this time

I wasnt real happy with how i had it together before anyways, so maybe i can do a lot better this time

_____________________________

-Electric Traxxas Stampede(16t/XRS esc)
-.15 t-maxx(Undergoing Gasser conversion)

(in reply to nexzzt)

Post #: 479

RE: Maxx Gasser Build Notes (Gas S-Maxx Conve... - 3/7/2008 10:34:20 PM

nexzzt

Posts: 71
Joined: 8/12/2007
From: QLD, AUSTRALIA
Status: offline

Check out post 428 by Fr33ze, he has tried the direct connection from motor shaft to rear diff. Seems he had limited success, but maybe you can make it work better. Also, with the final ratios on my truck that includes a Savage transmission it's pretty quick in 2nd gear (40 - 50km/h, sorry metric over here), so I couldn't imagine how fast a direct connection method would be, but would love to see it work

(in reply to cummins driver)

Post #: 480

RE: Maxx Gasser Build Notes (Gas S-Maxx Conve... - 3/8/2008 9:45:41 AM

cummins driver

Posts: 401
Joined: 3/3/2003
From: Lancaster, KY, USA
Status: offline

Thanks for pointing that post out. I have read the whole thread, but its amazing at the stuff i miss. Well it looks like that is a no go then. At least the direct drive part. I may still make/mount the frame the way i was talking about, and then raise the motor just enough to get the driveshaft coming out of the tranny under it. I want to keep the motor towards the back of the truck, so I could mount it as far back as possible, run a shaft to the tranny, then the driveshafts going to the front and rear diffs would be straight so they might hold up better that way. The U joints wouldnt have to compensate for any kind of angle that way. Plus I think with the truck being lower, it would handle better, and I could also shorten the frame a lot from how I have it now i believe. So I think that is going to be the current plan. The worst thing is that i have to find another magneto

That will be the hardest/most aggrovating part. Unless i can make one off the mccullough chainsaw motor, or the weedeater brand motor work on it. Doesent seem like it would be that hard, so ill probably try that first. So looks like ill be sticking with the 2 speed tranny. I kind of wanted to anyways, but I figured if a direct drive would work there would be very little to go wrong. Looks like it'll be a little high geared though. Pics will be up as soon as i start the new and improved build

_____________________________

-Electric Traxxas Stampede(16t/XRS esc)
-.15 t-maxx(Undergoing Gasser conversion)

(in reply to nexzzt)

Post #: 481

RE: Maxx Gasser Build Notes (Gas S-Maxx Conver... - 3/8/2008 8:20:09 PM

bigdaddygro

Posts: 24
Joined: 3/8/2008
From: cutoff, LA, USA
Status: offline

hey cummins driver before u start hit me up at bigdaddygro@aol.com and ill send u some pics of the one i built its really nice really simple and really professional . after 14 hrs of operation i havent broken anything i cant figure out how to post pictures . i took some 1/4'' aluminum scrap made a new chassi plate and braces i bolted the engine a cub cadet 2025 to the chassi plate ran the motor and used it as a lathe i used a file and cut the shaft down untill i could press a hpi threaded clutch bell on it then put u 36t revo gear on the tranny. this gave me about 25 mph in second . oh yeah my 2 speed does work. then i put the same gear on the tranny wich made it 1 2 1 . so i have a red hpi gears wich r 23t . this set up gives me unlimited gear possibilities and utilizes the slipper wich saves on the gears . im also a cummins driver 02 3500 4''ss exhaust quadzilla chip engine monitor we call it goatzilla hit me up or tell me how to post pics

(in reply to cummins driver)

Post #: 482

RE: Maxx Gasser Build Notes (Gas S-Maxx Conve... - 3/8/2008 8:35:22 PM

cummins driver

Posts: 401
Joined: 3/3/2003
From: Lancaster, KY, USA
Status: offline

I did a little redneck math to try and figure out the top speed of my truck if it were direct drive.

The rear axle has a ratio of 2.8:1. If the motor turns 7k rpms, and you divide it by the 2.8:1 reduction it would be getting through the rear end, then at 7k rpms, the axle shafts will be turning 2500rpm.

Now my T-Maxx is down at the shop, so i dont have a wheel to measure the circumference of right now(the distance around), but I am going to guess 15 inches for this calculation.

So you take 2500rpm(rotations per minute) and if it goes 15 inches every rotation you come up with 37,500 inches per minute. Or 3125 feet per minute.

If you take 36(mph), and since you have 5280ft in a mile, you take 36 and multiply it by 5280ft which gives you 190,080 feet per hour. Divide that number by 60 to get back into feet per minute, and it gives you 3168 feet per minute which is really close to the 3125 feet per minute i said the truck would go at 7k rpms which should be about all the motor will turn.

So to the best of my calculations, the truck should go right around 36mph direct drive. Which would lead me to believe if the clutch on the motor is set up properly would still give you a good bottom end, and pretty decent top end. Since a lot of single speed nitro's will go about the same speed with good bottom and top end power still. And this motor is much more torquey than a nitro.

Keep in mind, this is with a rough guess on the circumference of the tire, so until i actually measure the tire, i cant come up with an exact figure. But it should be really close.

So I may still try the direct drive thing. It just seems to me if the clutch was set up to engage a little late it would still come out of the hole pretty good. The clutch might even be fine stock though. I might just find out the hard way

_____________________________

-Electric Traxxas Stampede(16t/XRS esc)
-.15 t-maxx(Undergoing Gasser conversion)

(in reply to bigdaddygro)

Post #: 483

RE: Maxx Gasser Build Notes (Gas S-Maxx Conver... - 3/8/2008 8:46:00 PM

cummins driver

Posts: 401
Joined: 3/3/2003
From: Lancaster, KY, USA
Status: offline

quote:

ORIGINAL: bigdaddygro

hey cummins driver before u start hit me up at bigdaddygro@aol.com and ill send u some pics of the one i built its really nice really simple and really professional . after 14 hrs of operation i havent broken anything i cant figure out how to post pictures . i took some 1/4'' aluminum scrap made a new chassi plate and braces i bolted the engine a cub cadet 2025 to the chassi plate ran the motor and used it as a lathe i used a file and cut the shaft down untill i could press a hpi threaded clutch bell on it then put u 36t revo gear on the tranny. this gave me about 25 mph in second . oh yeah my 2 speed does work. then i put the same gear on the tranny wich made it 1 2 1 . so i have a red hpi gears wich r 23t . this set up gives me unlimited gear possibilities and utilizes the slipper wich saves on the gears . im also a cummins driver 02 3500 4''ss exhaust quadzilla chip engine monitor we call it goatzilla hit me up or tell me how to post pics

I sent ya a message back with my email. Id love to see the pics of it. Sounds sweet since you can change the gearing

If you can send me pictures, i can post em on this thread for you

< Message edited by cummins driver -- 3/8/2008 8:47:28 PM >

_____________________________

-Electric Traxxas Stampede(16t/XRS esc)
-.15 t-maxx(Undergoing Gasser conversion)

(in reply to bigdaddygro)

Post #: 484

RE: Maxx Gasser Build Notes (Gas S-Maxx Conve... - 3/8/2008 8:56:43 PM

bigdaddygro

Posts: 24
Joined: 3/8/2008
From: cutoff, LA, USA
Status: offline

ok my pics are in my profile check em out tell me what u think . doc check it out . i told my wife it was your fault

(in reply to bigdaddygro)

Post #: 485

RE: Maxx Gasser Build Notes (Gas S-Maxx Conve... - 3/8/2008 9:10:44 PM

cummins driver

Posts: 401
Joined: 3/3/2003
From: Lancaster, KY, USA
Status: offline

That looks sweet. Do you still have the original clutch on the motor, or are you just using the HPI clutch? Or is it just the clutch bell threaded onto the shaft?

_____________________________

-Electric Traxxas Stampede(16t/XRS esc)
-.15 t-maxx(Undergoing Gasser conversion)

(in reply to bigdaddygro)

Post #: 486

RE: Maxx Gasser Build Notes (Gas S-Maxx Conve... - 3/8/2008 9:22:00 PM

bigdaddygro

Posts: 24
Joined: 3/8/2008
From: cutoff, LA, USA
Status: offline

im using the clutch on the motor the clutch bell is pressed on the shaft i filed the ring out of the inside where the bearings go i only flipped it once and not from a lack of trying . whatever u do DONT RUN IT IN THE ROCKS!!!!!!!!!!! THATS THE ONLY TIME I BROKE IT when the rocks get caught between the suspension and the wheels it will jam up and spin the hexes out in the rims or check this out flip the whole carrier over . i never seen that happen before i thought it was ruined but i just flipped it right back hooray for plastic

(in reply to cummins driver)

Post #: 487

RE: Maxx Gasser Build Notes (Gas S-Maxx Conve... - 3/8/2008 9:32:12 PM

nexzzt

Posts: 71
Joined: 8/12/2007
From: QLD, AUSTRALIA
Status: offline

bigdaddygro, great setup, thanks for posting the pics.

(in reply to bigdaddygro)

Post #: 488