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Old 03-11-2009, 10:00 AM   #1
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Default weird problem with vspec in x1-crt truggy

heres a stumper...it really has me baffled....

whenever i fire my vspec in my jammin truggy,the feft front motor mount screw head breaks off...it has happened 3 times now....what could cause this?
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Old 03-11-2009, 10:16 AM   #2
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Something is pushing up on the engine at the front of the block is the first thing that comes to mind.. considering its the same bolt you may want to see if the motor is fully seated at the front.
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Old 03-11-2009, 10:19 AM   #3
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Chassis bent?
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Old 03-11-2009, 10:25 AM   #4
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when you start the truck, do you push down on the engine or the back of the car? pushing the back of the car down may do that. I just push down on the ignitor
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Old 03-11-2009, 10:33 AM   #5
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i push down with the ignitor,chassis isnt bent,nothing seems to sit abnormal...and it doesnt do it when i fire it on the box,it does it after its fired,sitting on the box when i clear it out...
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Old 03-11-2009, 10:55 AM   #6
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Then use better screws.
(Don't get mad I mean this in a good way)
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Old 03-11-2009, 10:58 AM   #7
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funny you should mention that...1st time was stock "ofna" screw....2nd time was racers edge screw from their crt screw kit....3rd time was screw from rcscrewz kit...not over tightening them...using loctite(which is a paint to get broken part out)....going to ditch the 2pc stock type motor mount and put in my 1 piece.
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Old 03-11-2009, 11:00 AM   #8
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Hmm.
Well sounds like your on your way to a solution.
If your other mount doesn't have a problem then it was the mount.
Good luck man.
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Old 03-11-2009, 11:03 AM   #9
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get better screws...stainless steel is weak

www.tonysscrews.com
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Old 03-11-2009, 11:06 AM   #10
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My friend broke 2 ofna motor mount screw the first day out, they suck. RCscrewz kits are stainless screw which are fairly weak. Racers edge IDK about them. Tony's Screws are top quality from what I hear. Locally, we have a deal with Fastenal and we get 12.9 grade screws which are very strong. It sounds to me like you just need some good strong 12.9 grade screws. I tighten in a criss cross patern and never use threadlock, and I don't have issues.
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Old 03-11-2009, 11:14 AM   #11
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Sounds to me like the motor is not sitting flat on the motor mount. Something could be warped or the bottom or the engine is hitting the top of the chassis.
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Old 03-11-2009, 11:16 AM   #12
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+1 on Tonys screwz I cant believe I forgot those
They're the shiznit (new terminology to me there)
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Old 03-11-2009, 11:27 AM   #13
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Oh and if I remember right there was a stiffener support made for engine area on the jammin truggy. don't know if this will help but the chassis might have a twist in the engine area that isn't really visible
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Old 03-11-2009, 12:04 PM   #14
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Quote:
Originally Posted by Alan D. View Post
Oh and if I remember right there was a stiffener support made for engine area on the jammin truggy. don't know if this will help but the chassis might have a twist in the engine area that isn't really visible
The "pro kit" has a "z brace." The RTR doesn't. That should not be the problem.

I don't use "special" screws... I go buy regular socket head screws from Ace Hardware. I've never had one break. I have had some back out, even with lock washers. (like at the "March Meltdown" race last weekend... 22 minutes into a 45 minute A-main.) That is WITH lock washers.
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Old 03-11-2009, 12:07 PM   #15
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thats 1 thing i hadnt noticed on this truggy....it doesnt have the "Z" brace like my other one does...and this is the speed tuned vspec...so maybe it is causing alot of chassis flex...guess ill put the brace on along with my 1pc mount and give a report in a couple hours....its just weird,i can run it 1/4 throttle sitting on the bump box and its fine,go to a full throttle "clear it out" squeeze,and you can watch the head of the bolt snap right off...almost like insane harmonics are causing it to sheer off...i even tried it without tires and wheels bolted on to make sure it wasnt a balnce issue and being shook to death.
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