Trike - higher ratio differential? - SV650.org

02-04-12, 04:57 PM

right want to up gear gems trike as first is redundant
it seems that the easyest way to do this is to change the rear diff for one with a better ratio
its a ford sierra atm and would surmise that id still need to use a sierra dif but a higher ratioed one
my question is how do i check which is in it and how would i find out which is geared higher

is there anything i could be missing here eg will i have to change the drive shaft etc

dave

02-04-12, 05:03 PM

Daft question... what size wheels are you running? Bigger wheels should knock the acceleration down in favour of a higher top speed, if I remember the way we were thinking on the project in the garage.

rictus01 · 02-04-12, 05:31 PM

well the normal way to identify the diff ratio would be to look up the make and model and year, however that maybe a little difficult, but you should be able to find the type (shape and fixing etc) by comparison, in order to get the ratio the diff is set to, put a mark in the intake flange (where the propshaft fits) and the outlet (where drive shaft fits), rotate the driveshaft flange a complete turn and count how many (or part there of) rotations of the propshaft flange, this will give the ratio you currently have.

Cheers Mark.

Bibio · 02-04-12, 06:15 PM

might be better asking on one of those weird ford owners club forums.

what engine is in the trike?

02-04-12, 07:10 PM

its a dragstar 650 engine bibio mate

Bibio · 02-04-12, 07:51 PM

so half bike trike and not one of those vw things.

from what i remember from my cortina/escort days it's possible to change the final ring and pinion in the diff housing. common mod with escorts.

i found this if it's any use. http://www.super7thheaven.co.uk/Sier...r_Differential

might be worth giving these people a phone. http://www.quaife.co.uk/

02-04-12, 07:53 PM

normally the "economy" models have a higher diff ratio than the sporty stuff.

Paul the 6th · 02-04-12, 08:32 PM

photograph and serial or model number markings on the diff, get on www.Locostbuilders.co.uk and post said pictures along with any info you may have as to the origin of the diff...........

People on there will argue til the world ends as to which diff it is, and more helpfully will advise on a better ratio diff.

punyXpress · 03-04-12, 10:00 PM

Just SOMETIMES ratios are stamped on diff carriers.
9/27 or 9:27 would give 3 to 1

02-04-12, 04:57 PM	#1
davepreston Guest Posts: n/a	Trike - higher ratio differential? right want to up gear gems trike as first is redundant it seems that the easyest way to do this is to change the rear diff for one with a better ratio its a ford sierra atm and would surmise that id still need to use a sierra dif but a higher ratioed one my question is how do i check which is in it and how would i find out which is geared higher is there anything i could be missing here eg will i have to change the drive shaft etc dave

02-04-12, 05:03 PM	#2
orose Guest Posts: n/a	Re: trike diff Daft question... what size wheels are you running? Bigger wheels should knock the acceleration down in favour of a higher top speed, if I remember the way we were thinking on the project in the garage.

02-04-12, 05:31 PM	#3
rictus01 Member Mega Poster Join Date: Jul 2003 Location: South London Posts: 9,799	Re: trike diff well the normal way to identify the diff ratio would be to look up the make and model and year, however that maybe a little difficult, but you should be able to find the type (shape and fixing etc) by comparison, in order to get the ratio the diff is set to, put a mark in the intake flange (where the propshaft fits) and the outlet (where drive shaft fits), rotate the driveshaft flange a complete turn and count how many (or part there of) rotations of the propshaft flange, this will give the ratio you currently have. Cheers Mark. __________________ Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming, 'Wow! What a Ride!

02-04-12, 06:15 PM	#4
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: trike diff might be better asking on one of those weird ford owners club forums. what engine is in the trike?

02-04-12, 07:10 PM	#5
davepreston Guest Posts: n/a	Re: trike diff its a dragstar 650 engine bibio mate

02-04-12, 07:51 PM	#6
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: Trike - higher ratio differential? so half bike trike and not one of those vw things. from what i remember from my cortina/escort days it's possible to change the final ring and pinion in the diff housing. common mod with escorts. i found this if it's any use. http://www.super7thheaven.co.uk/Sier...r_Differential might be worth giving these people a phone. http://www.quaife.co.uk/ Last edited by Bibio; 02-04-12 at 07:54 PM.

02-04-12, 07:53 PM	#7
AndyBrad Guest Posts: n/a	Re: Trike - higher ratio differential? normally the "economy" models have a higher diff ratio than the sporty stuff.

02-04-12, 08:32 PM	#8
Paul the 6th Member Mega Poster Join Date: Mar 2007 Location: Yorkshire Posts: 4,790	Re: Trike - higher ratio differential? photograph and serial or model number markings on the diff, get on www.Locostbuilders.co.uk and post said pictures along with any info you may have as to the origin of the diff........... People on there will argue til the world ends as to which diff it is, and more helpfully will advise on a better ratio diff. __________________ RIP Reeder 20/07/1988 - 21/03/2012 - You were awesome Cbf600, sv650, sv1000, gsxr 750 srad, KTM adventure 950, gsxr 750 k1, gsxr 750 srad, fazer 1000, zx9r ninja..

03-04-12, 10:00 PM	#9
punyXpress Member Mega Poster Join Date: Feb 2008 Location: Riding, North Posts: 2,664	Re: Trike - higher ratio differential? Just SOMETIMES ratios are stamped on diff carriers. 9/27 or 9:27 would give 3 to 1 __________________ Was: K2 naked in rapid yellow - gone to a better? place Now: Street Triple R

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