Hopicomponents: the universal diff. solution
#1
Hopicomponents: the universal diff. solution
Here I am to introduce you a new hop-up for both our off-roads models, buggy and truggy. Born out of the mind of Domenico Mezzabotta, an Italian modeler and devised in order to answer the problems of bindings and fast wear that plagued the differentials of its 8ight...may be of everybody’s 8ight!!!
Domenico has put “bearings” in the outdrive cup pivots, a not easy job considering parts small sizes, but not impossible… how? By using high quality steel.
The kit is made by Hopicomponents and its under patent pending.
Each kit contains two special diff-outdrive cups made by high quality steel, produced with high precision CNC machine tools and many steel rolls of 1 mm diameter each one.
When Domenico has decided to begin this adventure, he phoned
me asking if I could take care of the reliability and durability tests.
He sent me a set of prototypes so I could start my job!
Well, I treated them badly for one month both on buggy & truggy and now I can
tell You … those stuff is extremely reliable and give You a great increasing on overall traction performances: I never had failures of the product and the wear is not still percepibile.
Which are the PROs?
-remarkable low friction between diff housing/ring gear and the outdrive cup pivot
-long lasting of the new outdrive cups made by high quality steel
-less stressed areas on satellite and planetary gears, they works firmly
-lower temperature when differentials works
-less alteration of the viscosity of the silicone oil thanks to minor overheating of the case
-a better torque distribution on the three differentials
How to install the kit?
Simply put a film of high quality graphite grease on the outdrive cup pivot, then insert 15 rolls for each cup. The outdrive cup pivot is ready for being inserted in the diff housing and/or in the ring gear.
this is what’s happened to me in
The A-Main of the Italian Truggy Nats....
It will not happen any more!
Currently only the kit for Losi 8 is on sale, but Domenico is working on many different brands: so You will find in short time more kits for Jammin/HN, Hobao, Kyosho, etc.
You can buy the kit directly from www.hopicomponents.com.
Notice that the product has been positively reviewed on the Italian RC magazine
"TRUE MODEL", in the December 2007 number.
Domenico has put “bearings” in the outdrive cup pivots, a not easy job considering parts small sizes, but not impossible… how? By using high quality steel.
The kit is made by Hopicomponents and its under patent pending.
Each kit contains two special diff-outdrive cups made by high quality steel, produced with high precision CNC machine tools and many steel rolls of 1 mm diameter each one.
When Domenico has decided to begin this adventure, he phoned
me asking if I could take care of the reliability and durability tests.
He sent me a set of prototypes so I could start my job!
Well, I treated them badly for one month both on buggy & truggy and now I can
tell You … those stuff is extremely reliable and give You a great increasing on overall traction performances: I never had failures of the product and the wear is not still percepibile.
Which are the PROs?
-remarkable low friction between diff housing/ring gear and the outdrive cup pivot
-long lasting of the new outdrive cups made by high quality steel
-less stressed areas on satellite and planetary gears, they works firmly
-lower temperature when differentials works
-less alteration of the viscosity of the silicone oil thanks to minor overheating of the case
-a better torque distribution on the three differentials
How to install the kit?
Simply put a film of high quality graphite grease on the outdrive cup pivot, then insert 15 rolls for each cup. The outdrive cup pivot is ready for being inserted in the diff housing and/or in the ring gear.
this is what’s happened to me in
The A-Main of the Italian Truggy Nats....
It will not happen any more!
Currently only the kit for Losi 8 is on sale, but Domenico is working on many different brands: so You will find in short time more kits for Jammin/HN, Hobao, Kyosho, etc.
You can buy the kit directly from www.hopicomponents.com.
Notice that the product has been positively reviewed on the Italian RC magazine
"TRUE MODEL", in the December 2007 number.
#2
Tech Fanatic
That's a great design. I was just talking with a friend the other day about the problem of metal on metal contact on the diff cup/out drive.
#7
Tech Master
iTrader: (28)
alloy diff housings and cross pin blocks add a lot of un-needed weight to your drivetrain, they are ok for MT's or bashers, but for true race kits they are about the worst thing you can do,
the only thing I wouldn't like about this set up is putting all those needles together, I would need the kit to come with 4 or 5 extra for the ones I lost on the floor, lol
the only thing I wouldn't like about this set up is putting all those needles together, I would need the kit to come with 4 or 5 extra for the ones I lost on the floor, lol
#8
I think this was an excellent idea, and It could be even better with the feedback posted here. People have mentiond that the needle bearings laid loose like that could bind. Maybe it would be better for him to cut 6 precision half circle cuts into a stock outdrive and place the needle bearings in that, so he would be using the outdrive as a race as well. then he would also only need 6 needle bearings instead of 15 and it should perform the same.
#9
Im doing more pics, and I'll post them soon, to explain You all better.
Thanks
Thanks
#10
here below few images about the packaging of Losi 8 kits with bilingual
instructions
instructions
#11
There wont be any binding with loose needle rollers.... Automotive manufacturers have used them in drive shaft universal joints for the past 40-50 years without any problems....
#12
Tech Adept
Will someone sell them in the USA?
#13
within few days, paypal payment will be available too,
I have just discussed it by phone with Domenico
And I am doing an installation tutorial with my camera, so.... stay tuned
Mugen & Kyosho kits are still on track testing
I have just discussed it by phone with Domenico
And I am doing an installation tutorial with my camera, so.... stay tuned
Mugen & Kyosho kits are still on track testing