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HPI Savage 4.6 Gasser Conversion using a Zenoah G260 PUM engine

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HPI Savage 4.6 Gasser Conversion using a Zenoah G260 PUM engine

Old 08-18-2013, 09:54 AM
  #1  
Falcons Cuz
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Default HPI Savage 4.6 Gasser Conversion using a Zenoah G260 PUM engine

Hello Guys
After messing up with nitro powered trucks and having fun with them i am fed up with the tuning hassles of nitro engines and their running costs so last night i have decided to built a gas powered HPI Savage 4.6 x and for that i am going to used most of the parts from my old Savage and specially the transmission .The reason i have chosen this truck is that its transmission mostly have metal gears and the long suspension travel of this truck.More over i have done a modification earlier on my HPI Savage for increasing the width of truck and replacing the stock wheels and tires with Kyosho monster truck tires so this truck is an old platform for my silly ideas.
As the topic says i am going to show you how to convert a HPI Savage 4.6 using a gas engine and for this conversion i have decided to use a Zenoah G260 PUM engine .The main reason of using this engine is because i have this engine lying around over an year now and i really want to use this engine because its quite compact and have tons of power.The down side is that it is a water cooled engine and it is used to power 1/5 the scale boats so definitely i must need to convert this engine to be an air cooled engine.For this task i have decided custom built an aluminum cooling head as mounted over a nitro car engines.More over i have decide to use separate servos for brake and throttle for more braking power.The truck will be still a 4WD and the basic idea of vertical chassis will be used because of its strength to weight ratio and ground clearance.The finished length of the truck will be 30.5 inches and the width will be 21 inches.These pics are of the truck in stock condition and after the first modification.

I know guys that's its a silly idea but i believe that this project will be a good learning curve for me and it will give us a great platform to learn and share more knowledge about surface vehicles.Guys wish me best of luck and your valuable suggestions are greatly appreciated.



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Last edited by Falcons Cuz; 08-23-2013 at 06:34 AM.
Old 08-19-2013, 07:33 AM
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mooman007uk
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if you search around here you'll find one or 2 of these that have been done before and will maybe give you some ideas
Old 08-20-2013, 06:08 PM
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nitroexpress
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Finding a clutch system (one that will mount and not burn up) will be the biggest problem.
Old 08-23-2013, 06:39 AM
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Falcons Cuz
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mooman007uk

i have seen a very usefull thread for the conversion of a tmaxx 3.3 to a gasser and it was really an informative thread .The link to that thread is given below:

http://www.rcuniverse.com/forum/trax...-pics-vid.html

nitroexpress
I was planning to use a centrifugal clutch from a chainsaw wngine but hopefully i wont find a good one that will fit on my engine so i have decided to make it myself.
Old 08-24-2013, 02:21 AM
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Falcons Cuz
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Guys finally some progress!
First of all i have disassembled the truck and get a few parts cleaned to start the project.
As i have decided the chassis will be vertical design so to form the base of chassis i have used two aluminum stripes (4mm * 1 in * 22 in) on both sides and used the original mountings given on differential and shock tower cover to mount them .In this way the width is same as of the original chassis which gives me advantage to mount the servos holder and the gear box easily .After mounting the aluminum stripes on both sides i have mounted the engine and to do this properly i have decided to support the engine from both rear and front end to give it a firm mounting .On the rear end i have used aluminum bar (10mm * 10mm) to hold the engine while mounting them on the engine plate(The aluminum plate on which the pull starting bucket is mounted) and another piece in between the chassis to mount these bars and give chassis more hold and strength.Similarly on the front side i have used aluminum stripes (4mm * 16 mm) and mounted them on the aluminum bar and then on the chassis as shown in the pics.
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Old 08-24-2013, 08:49 AM
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Maj_Overdrive
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Just a couple ideas for the clutch that may work or spark another idea for you.

1. FG, Redcat or Baja clutch. I believe all are Mod 1.5 so it would require adapting the appropriate spur to the Savage transmission. For a spur I'd look into FG or Redcat intermediate gears as they'd probably be the right size for the gearing you'd want. Packaging is another story.

2. Attaching a metal mod1 spur gear to a Rc, weedwacker, chainsaw or other clutchbell. This might be the cheapest route but possibly the most intensive fabrication wise. I mention it because Revo or Savage spur gears would be about the right size to get the gearing right, since the Zenoah wont rev like the old nitro mill. Packaging might be easier since the gears will be a larger diameter than goon the FG route mentioned above.

With any of these I'd look into using an RC clutch bell and clutch support. You could make your own of course, but there's quite the variety out there that will bolt to your engine and at reasonable prices. Could save you some work and/or frustration.
Old 09-18-2013, 06:21 AM
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zenoah clutches have a threaded hole in the center- if youre crafty you can thread on a spacer, and use that to mount your spur of choice to the CB.

beware- not only do you have a marine engine and no water, that gas motor has over 4x the torque of the motor that was designed to go into that savage. the only thing holding all that power to the ground is a little one way bearing on a 4mm shaft... be prepared for it to die a violent and spectacular death.
Old 09-18-2013, 08:12 PM
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here is one of my custom builds to keep you going
http://www.youtube.com/watch?v=LrOq-MuaLoE

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