Gearing down 163" x 3" Chaincase

[HECKS]

Anyone changed out their 44 bottom gear with anything larger ? Curious to what size a guy can gear down to... 46 - 47. Probably requires a longer chain too i would imagine.
Riding Revy at 4000 - 7000ft with clutching and full Jaws exhaust.

 

[Sheetmetalfab]

Anyone changed out their 44 bottom gear with anything larger ? Curious to what size a guy can gear down to... 46 - 47. Probably requires a longer chain too i would imagine.
Riding Revy at 4000 - 7000ft with clutching and full Jaws exhaust.

I wouldn’t gear it any lower naturally aspirated.

i geared mine up for the turbo.

 

[kanedog]

I would gear it as low as humanly possible. Ie-As big of bottom sprocket and a 19 tooth on top. It might need a custom bottom sprocket made.

Sheet metal fab is dumb. Don’t listen to him unless he explains why one needs a 77mph top speed at 1-1 ratio.

 

[HECKS]

Looks like she's a bit tight in there, but should be able to squeak another tooth or two. Wahl Bro's makes up to a 46T.

 

[kanedog]

Ooh your right, she a bit tight. Yep, any additional teeth are a benefit. Experiment! Keep us updated. You could be a gearing pioneer!

 

[HECKS]

Haha. We will give er a go.
I'm guessing a tooth or 2 should not require a new chain eh ?

 

[HECKS]

Ordered up a 46T from Venom. Gearing calculator says the 74P chain will work.
If anyone is interested, Venom gave me the HY-VO gear O.D.'s :
Stock 44T is 5.096"
45T is 5.22"
46T is 5.34"

Difference of 0.244" from stock. Increase of 0.122" (3.09mm) to the bottom of chain case.
2.42 gearing / Final Drive of 2.63

 

[alexkravets]

I would gear it as low as humanly possible. Ie-As big of bottom sprocket and a 19 tooth on top. It might need a custom bottom sprocket made.

Sheet metal fab is dumb. Don’t listen to him unless he explains why one needs a 77mph top speed at 1-1 ratio.

If you climb in soft snow you do want 77mph track speed there is nothing wrong with that

 

[kanedog]

Well Burandts turbos only get 45mph in his soft snow in a steep climb so if you can get a NA sled to turn 77mph, you will be a sled god.

 

[alexkravets]

Well Burandts turbos only get 45mph in his soft snow so if you can get a NA sled to turn 77mph, you will be a sled god.

I have 2018 Axys with 10 psi Silber turbo top gear 20 bottom gear 44
I can do 49-50 miles per hour on 1 foot of snow

 

[Sheetmetalfab]

I have 2018 Axys with 10 psi Silber turbo top gear 20 bottom gear 44
I can do 49-50 miles per hour on 1 foot of snow

???

 

[HECKS]

I have 2018 Axys with 10 psi Silber turbo top gear 20 bottom gear 44
I can do 49-50 miles per hour on 1 foot of snow

Bahaaaahaaaaa ! Looks like you used 4 psi out of your 10.
Nice dismount though....should have kept her squashed....you would have made er bro

 

[kanedog]

Two things were broken. The sound barrier and yer shoulder haha. You’re a trooper though. Not even a moan or a pain complaint. Total sledsoldier, suffering in silence.

 

[HECKS]

Trying to install this 46 bottom gear is a real biatch. Can't seem to get the 74p chain to stretch enough to get it all together. I have the drive shaft and jack shaft unbolted and slid to mag side. And if I do get'er is it going to be to tight !? Wondering if i'm needing a 76p chain, but worried I will have to much dog leg...... anyone have these issues ?

 

[go-on-two]

Trying to install this 46 bottom gear is a real biatch. Can't seem to get the 74p chain to stretch enough to get it all together. I have the drive shaft and jack shaft unbolted and slid to mag side. And if I do get'er is it going to be to tight !? Wondering if i'm needing a 76p chain, but worried I will have to much dog leg...... anyone have these issues ?

Don't think it will work, it was all I could do to install the 45 tooth bottom.

 

[HECKS]

Thanks Goon. I'll try the 76 chain I guess.

 

[Teth-Air]

Buy a smaller top gear.

 

[HECKS]

I froze the gears overnight and juuuuuust got them on at lunch, but the chain tension is wacked.
Teth-Air, I was in the understanding that an 18 top is to small and to stick with a 19 ?

 

[HECKS]

Got a 18T coming and 76P chain to be covered both ways. Heading to Revy next weekend to test her out.

 

[deten8]

So to get a 45 on did you have to un bolt case etc?