Project 29er With Twin CY460 Engines!

[5-7HEAVEN]

We're crawling on the roads here. I think my average speed is less than 20mph in traffic. No such thing as wide-open roads here, just traffic light to light.

 

[5-7HEAVEN]

After having major front/rear weight bias with my Mits engine, Staton chain drive and NuVinci hub, I've decided to mount the twin 460 engines/Staton drive center-framed. A competent welder can fab up mounts for the Staton gearbox, with engine chainring sprocket aligned w/Staton 22t gearbox sprocket. I'll chain up to a shift kit and an inexpensive 11t-34t cassette and derailleur. A gentle standing start with maybe one engine, then second engine kicks in at low rpm. I'm hoping this 8-speed chain (the weakest link, literally) lasts this way. If not, then I'll install the NV hub with #41 chain.

Front/rear weight bias would then be acceptable. Total weight might be about 70lbs.

I shipped the Staton twin-engine gearbox back to Dave for a complete overhaul.

This puppy should FLY!

 

[5-7HEAVEN]

I've been working on gear ratios and sprockets:

18t White Industries freewheel on the gearbox/44t chainring = 2.4444:1
18.75 gearbox x 2.4444 = 45.83:1
34tooth first gear on cassette/36t bike chainring sprocket = .94444:1
.94444 x 45.83:1 = 43.29:1 first gear ratio. A single engine will have no problem climbing a steep ramp or hill with 43.29:1 first gear. With twin engines, should have absolutely no problem climbing any hill.
15t sixth gear/36 = .416666
.416666 x 45.83 = 19.1:1
At peak torque/8500rpm, speeds of 34.4mph.
At peak hp/11000rpm, speeds of 44.5mph
13t seventh gear/36 = .3611:1
.3611 x 45.83 = 16.55:1
At peak torque/8500rpm, speeds of 39.7mph in seventh gear
At peak hp/11000rpm, speeds of 51.4mph in fifth gear
11t eighth gear/36 = .3055:1
.3055 x 45.83 = 14 to 1
At peak torque/8500rpm, speeds of 47mph in eighth gear
At peak rpm/11000, speeds of 60.8mph in eighth gear

If the 8-speed chain and cassette cannot handle the twin engines' power, then a NuVinci hub w/a stronger single-speed chain is installed w/these ratios:

13t on the gearbox/44t chainring = 3.385:1
18.75 gearbox x 3.385 = 63.47:1
18t White Industries NV hub sprocket/36t bike chainring = .5:1
63.47 x .5 = 31.735:1
Lowest ratio on NV hub is 3.5:1
31.735 x 3.5 = 111.07:1 With this gearing, any engine should be able to slowly climb any hill, or blaze uphill with the NV hub.
Highest ratio on NV hub = .5:1
31.735 x .5 = 15.87:1
At peak torque/8500rpm, speeds of 41.4mph
At peak hp/11000rpm, speeds of 53.6mph

In comparison, my friend has a 460 engine w/Staton gearbox and NV hub.
He has a 22t gearbox sprocket w/36tNV hub.
36/22 = 1.636363
Staton gearbox 18.75:1 x 1.636363 = 30.681817:1
Multiply 30.681817 x 3.5 = 107.42:1 for lowest gear.
Multiply 30.681817 x .5 = 15.34:1 for high gear.
At peak torque/8500rpm = 42.9mph
At peak hp/11000rpm = 55.5mph

I'm definitely on the same page as my friend is. His top speed is 53mph.

 

[andrew5826]

was this project ever finished? id like to see 2 460s on a bike. its been done on a goped before and that goped was gpsd at 60+. if you need any info about 460s u can ask me. i have a couple all ported and piped hitting 45+ on my gopeds

 

[5-7HEAVEN]

was this project ever finished? id like to see 2 460s on a bike. its been done on a goped before and that goped was gpsd at 60+. if you need any info about 460s u can ask me. i have a couple all ported and piped hitting 45+ on my gopeds

Sadly, no.

My friend gave me a Staton twin-engined gearbox which needed repairs. I sent it back to Staton in September 2011. He never got around to fixing it, and it's still with him. Whenever I spoke with him, he'd say he'd get to it, but never did. I told my friend he can have the gearbox back, because I will NOT deal with a flake like Dave Staton. I've spent thousands on his parts. He's good on sales, very poor on customer service.

I am not building a project where I cannot depend on the vendor for support.

I have the 460 engines on the shelf. Single engine/midframe with shift kits seem to work well for them......

except for the darn unreliable clutch!

What do you do for a reliable clutch?

 

[andrew5826]

dam that sucks to hear. ive been looking to adapt a 460 to a bicycle since their easier
to get parts for the 66/80cc kits just dont seem that powerful. what does it take to put a 460 on a bicycle and have a manual clutch and be able to shift thru the gears on the bicycle?

and as for the clutch ive been using the stock cy clutch with the clutch saver and hd springs from davesmotors.com with good luck. Clutch savers engage right off idle and hd springs engage around 1/2 throttle 8000rpm. if ur still breaking those someone on gopednation has been designing a new reliable clutch. heres a link
www.gopednation.com/forum/showthread.php?t=326592

 

[5-7HEAVEN]

dam that sucks to hear. ive been looking to adapt a 460 to a bicycle since their easier
to get parts for the 66/80cc kits just dont seem that powerful. what does it take to put a 460 on a bicycle and have a manual clutch and be able to shift thru the gears on the bicycle?

and as for the clutch ive been using the stock cy clutch with the clutch saver and hd springs from davesmotors.com with good luck. Clutch savers engage right off idle and hd springs engage around 1/2 throttle 8000rpm. if ur still breaking those someone on gopednation has been designing a new reliable clutch. heres a link
www.gopednation.com/forum/showthread.php?t=326592

JMO, the 460 works best center framed/midframed mounted with SBP shift kit and 8-speed cassette. Use the 5:1 pocket bike tranny, 8mm 11-tooth sprocket and 72t chainring sprocket. Your gearing at this point will be 32.73:1.

Then use a 24t bicycle chainring and an 11t-34t rear cassette. Your final gearing will range from 46.36:1 first gear to 15:1 highway gear.

The 460 engine will scream for joy! Just remember to slack the throttle and pedal a couple seconds before shifting gears.

The Dominator works best but is loud as ****. Besides, they won't bolt on in the midframe position. ADA S1 works well, quiets the 460. The SBP Happy Time expansion pipe also works pretty good, even tho the exhaust port and pipe flange is grossly mismatched. However, this pipe will make the loud 460 so quiet, you'd swear you can hear the piston ring scraping the cylinder at idle speed.

Hope this helps.

 

[andrew5826]

Do u have a pic of this setup?

 

[5-7HEAVEN]

Hmmm, it used to be in here. Lemme go look.