PR6 weight vs prosport/clubsport weight
Discussion
Hi all, anyone have an idea if the chassis of a pr6 is heavier or lighter than a prosport one please? I am asking as my mate has a prosport which is about 30 kgs lighter than mine (pr6) , I do know of a few things he did do to make it lighter, but was curious if the actual chassis is lighter or not.
Cheers
Cheers
PR6 is heavier, and later ones are heavier still
Bigger oil coolers, oil tank, heavier front splitter/diffuser, crash box, sidepods, bigger brakes, reversing diff etc.
Body weight is highly variable...
Chassis weight differnces between Pr6 and Prosport seem likely, but will also be a lot less material than all the above.
Bigger oil coolers, oil tank, heavier front splitter/diffuser, crash box, sidepods, bigger brakes, reversing diff etc.
Body weight is highly variable...
Chassis weight differnces between Pr6 and Prosport seem likely, but will also be a lot less material than all the above.
From what I understand from various conversations with the design and production guys @ Peterborough over the years, bare chassis-wise, the original PR6 design was originally a fair bit lighter than the Prosport when it was being developed to replace it; then (rightly IMHO) pre-production it was evolved to be no heavier than a Prosport, but to be both significantly more rigid and that bit safer. So, I would say unless there is some other meaningful reason not to do so, go with the PR6's chassis.
Thought it might be useful to post the pics of both, which also makes it easy to see how much the PR6 was very much an evolution of the Prosport:
Prosport >
PR6 >
Hope this helps.
PS As Martin has said a PR6 usually weighs in heavier than a Prosport (up to say 25Kg is not uncommon in my experience) because it usually has a lot more kit plus way heavier bodywork.
Thought it might be useful to post the pics of both, which also makes it easy to see how much the PR6 was very much an evolution of the Prosport:
Prosport >
PR6 >
Hope this helps.
PS As Martin has said a PR6 usually weighs in heavier than a Prosport (up to say 25Kg is not uncommon in my experience) because it usually has a lot more kit plus way heavier bodywork.
There are minimum weights for all Classes with the Circuit Championship I'm mainly involved with, the 750 Motor Club's Radical Owners Club Bikesports Championship, so over the last four years, we have amassed an extensive database of what Radicals weigh, therefore including of course the 'Devil's Child' PR6, which is easily the most popular car numerically in what is currently our Class B. Parc Ferme (so supposedly with enough fuel onboard to fuel test should one decide to do so), PR6s weight from about 480 - 500KG wet, excluding the driver complete with his PPE. Generally (but not always) the newer the car, the more it weighs. I recollect James that yours (originally at least) had the old style sidepods, so yours is possibly an earlier lighter car, especially if it is dry-sumped - most are not, so may have been closer to 480KG.
So if I understand correctly, as you have got your PR6's wet weight down to 440KG, with dry sump, lightweight bodywork (and presumably stuff like a small tank, maybe reduced wiring etc?) you've done very well. As for your mate with his Prosport at 410KG, might that possibly be the far from rare occurrence of someone totalling up their flat patch corner weights and then forgetting to add back the weight of the front and rear top bodywork that they removed to set up the corner weights correctly? I.e. short of cutting out several bits and pieces of a Prosport's standard chassis (which would be totally bonkers) I'm struggling to see how anyone would get the wet weight of a 'Busa engined Prosport down that low; for example, the original Clubsport was usually 440-450KG wet and that was with next to no equipment and no rear plane/flap all of which are not exactly light on a Radical.
Maybe he's running helium in his tyres?
HTH
Cheers
Trev
So if I understand correctly, as you have got your PR6's wet weight down to 440KG, with dry sump, lightweight bodywork (and presumably stuff like a small tank, maybe reduced wiring etc?) you've done very well. As for your mate with his Prosport at 410KG, might that possibly be the far from rare occurrence of someone totalling up their flat patch corner weights and then forgetting to add back the weight of the front and rear top bodywork that they removed to set up the corner weights correctly? I.e. short of cutting out several bits and pieces of a Prosport's standard chassis (which would be totally bonkers) I'm struggling to see how anyone would get the wet weight of a 'Busa engined Prosport down that low; for example, the original Clubsport was usually 440-450KG wet and that was with next to no equipment and no rear plane/flap all of which are not exactly light on a Radical.
Maybe he's running helium in his tyres?
HTH
Cheers
Trev
Edited by splitpin on Monday 7th November 20:13
Hi Trev thanks for your input. Mine has no dry sump, i fit an accusump. Also that weight was without the oil cooler, so that''s another 7kgs right there. However now with my new engine ,1400, I fit a radiator fan and kept the oil cooler , so my weight will go up a bit again. Doing the corner weights on Friday now.
My mate went to extremes to put the weight down, he even changed the ventilatec discs for normal discs, half the weight, fuel tank only takes 2-3 lts etc.
Cheers
James
My mate went to extremes to put the weight down, he even changed the ventilatec discs for normal discs, half the weight, fuel tank only takes 2-3 lts etc.
Cheers
James
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