Marina based Roadster rear diff/axle

[listerjp2]

Re: Marina based Roadster rear diff/axle

Someone obviously knows, keep it to yourself at present, lets see if Lee knows.

[hatzflyer]

Re: Marina based Roadster rear diff/axle

Hi I'm new here. Does anyone know what ratio a standard 1.7 Ital diff is?
Mine seems to rev very hard, 5000rpm is giving approx 70mph.Is this low?

[lil_red_roadster]

Re: Marina based Roadster rear diff/axle

Feels like a van axle...

1.7 Ital should be 3.63:1...which should deliver 70mph at 3688rpm (on 185/70/13 tyres). A 4.11 diff (Marina 1.3) would give 70mph at 4168rpm.

Assuming you have the correct diff ratio 5000rpm should deliver c95mph...or about 85mph if you have the 4.11...how accurate is the speedo?

And then then it's possible you might have the 3.89 fitted to the 1.3 A+ engined Ital...but it seems probable you've got a van axle with a 4.56 ratio and 70mph at 4625rpm.

Was the car used for trialling in the past?

[mark_tinkler]

Re: Marina based Roadster rear diff/axle

Hi John,
If it is from a van maybe you could do a deal with Jim Bounden. Saw a post from him in September looking for a half shaft. He was finding it hard to find one at the time.

[hatzflyer]

Re: Marina based Roadster rear diff/axle

Thanks for the tips, I will double check rpm/mph and maybe invest in a new diff.Just spoke to the guy with the overdrive for sale as well and counting my pennies.