strongest diff
Discussion
Years ago I had a 2 litre engine in my spitfire, on a 3.27:1 diff. The diff broke and I never worked out why, is the 3.27 diff inherently weak or are there different versions? It's a std GT6 ratio for non overdrive versions so I'd have thought it was up to the job. Is there a known beefy diff in a high ratio?
Not sure about the answer to this but try asking on this forum - http://www.sideways-technologies.co.uk/forum/Blah.... they know there stuff!
Oli
Oli
cheers3.27 is weak, not really by design but more by stresses put on the CWP.
The late spitfire 1500 3.63 iss the strongest as it was a modified design, butthe 3.63 or 3.89 are pretty good.
I broke several 3.27 in my vitesse 2500, but the 3.63 lasted better.
The 3.63 was OK in my 150bhp zetec engined car driven pretty hard (not raced, but autosolo/autotests etc)but may use a 3.89 in the next to make better use of the 7500rpm available.
Clive
The late spitfire 1500 3.63 iss the strongest as it was a modified design, butthe 3.63 or 3.89 are pretty good.
I broke several 3.27 in my vitesse 2500, but the 3.63 lasted better.
The 3.63 was OK in my 150bhp zetec engined car driven pretty hard (not raced, but autosolo/autotests etc)but may use a 3.89 in the next to make better use of the 7500rpm available.
Clive
You can try PMiong him on here - see the this thread ( http://www.pistonheads.com/gassing/topic.asp?h=0&a...)
Edited by //j17 on Wednesday 11th March 09:17
Joo, the stongest diff is generally accepted as one fited to the late 1500's - either as a 3.63 or a 3.89 - I'm guessing that a 3.63 would be better for you... The 3.27 was much weaker both as a CWP set and also, I believe, the bearings are smaller. I have broken a tooth off a 3.27 just using a 2.5 Triumph lump.
Alternatively, some people have fitted the diff from a Subaru Impreza which is a lot stronger and also LSD. A company in New Zealand were producing a conversion kit for these a few years ago which just allowed it to bolt straight into the Triumph mounts. I'll see if I can find some further details.
If you're struggling to get hold of Dave (Sideways) PM me and I can let you have his details.
Alternatively, some people have fitted the diff from a Subaru Impreza which is a lot stronger and also LSD. A company in New Zealand were producing a conversion kit for these a few years ago which just allowed it to bolt straight into the Triumph mounts. I'll see if I can find some further details.
If you're struggling to get hold of Dave (Sideways) PM me and I can let you have his details.
Sorry chaps, long time since I was here.
The crownwheel carrier fitted to the 3.27s is unique, (with such a large pinion the carrier is shunted to one side). Not only is it unique but it also fatigues, virtually all carriers show fatigue cracks when checked after big mileages.
All cownwheel carriers were changed for later 1500 Spitfires, these were stronger although the cross lock pin has a tendency to break. This stronger carrier design was also applied to the 3.27 diff fitted to Swiss market Spitfire 1500s (and to later TR7 autos fitted with the Triumph axle).
This latest type carrier can only be fitted to post 71 diff front housings.
All GT6 3.27 diffs have the weak carrier, genuine 3.27 Spitfire diffs are somewhat rare.
The crownwheel carrier fitted to the 3.27s is unique, (with such a large pinion the carrier is shunted to one side). Not only is it unique but it also fatigues, virtually all carriers show fatigue cracks when checked after big mileages.
All cownwheel carriers were changed for later 1500 Spitfires, these were stronger although the cross lock pin has a tendency to break. This stronger carrier design was also applied to the 3.27 diff fitted to Swiss market Spitfire 1500s (and to later TR7 autos fitted with the Triumph axle).
This latest type carrier can only be fitted to post 71 diff front housings.
All GT6 3.27 diffs have the weak carrier, genuine 3.27 Spitfire diffs are somewhat rare.
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