PR6 weight vs prosport/clubsport weight

PR6 weight vs prosport/clubsport weight

Author
Discussion

scooby151

Original Poster:

358 posts

176 months

Thursday 13th October 2016
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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

dunc_sx

1,607 posts

196 months

Monday 17th October 2016
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Ignore, misread your question rolleyes

mb26

219 posts

162 months

Friday 4th November 2016
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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.

scooby151

Original Poster:

358 posts

176 months

Friday 4th November 2016
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Thanks for your input. Was just curious to know the difference in the chassis weight

splitpin

2,740 posts

197 months

Saturday 5th November 2016
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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.

scooby151

Original Poster:

358 posts

176 months

Saturday 5th November 2016
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I have a PR6, I was wondering from where my mate managed to reduce his car's weight by more than 30kgs to mine (410kgs). I have a lightweight body , no dry sump , etc.

Josh Smith

437 posts

235 months

Sunday 6th November 2016
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Lightweights! I'm 500+driver!

Sigmamark7

314 posts

160 months

Sunday 6th November 2016
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Must be the weight of that bag of talent you keep in the car Josh!!

dunc_sx

1,607 posts

196 months

Monday 7th November 2016
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I've got a clubsport chassis here, going to pop it on the scales and post if it's helpful?

Rgds,

Dunc.

scooby151

Original Poster:

358 posts

176 months

Monday 7th November 2016
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That would be great. Thanks so much.

scooby151

Original Poster:

358 posts

176 months

Monday 7th November 2016
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Josh, is there any weight limit in the group or class that you race?

splitpin

2,740 posts

197 months

Monday 7th November 2016
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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? biggrin

HTH

Cheers

Trev

Edited by splitpin on Monday 7th November 20:13

Sigmamark7

314 posts

160 months

Monday 7th November 2016
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splitpin said:
so over the last four years, we have amassed an extensive database of what Radicals weigh
Trev. Can you give me an idea of the wet weight of a SR3RS?

splitpin

2,740 posts

197 months

Tuesday 8th November 2016
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Sigmamark7 said:
Trev. Can you give me an idea of the wet weight of a SR3RS?
Hi Mark, no problem. 590-610KG, 'rule of thumb' call it 600KG

Cheers

Trev

Josh Smith

437 posts

235 months

Tuesday 8th November 2016
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Hi James, no minimum weight in OSS

scooby151

Original Poster:

358 posts

176 months

Tuesday 8th November 2016
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Thanks Josh

scooby151

Original Poster:

358 posts

176 months

Tuesday 8th November 2016
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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

dunc_sx

1,607 posts

196 months

Monday 14th November 2016
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My clubsport chassis weighs in at 70.7Kg. Bare chassis on calibrated corner weight scales.

Unless anyone knows the weight of a PR6 chassis this information is somewhat useless however. I reckon they'd be the same (or very close to it) though.

Cheers,

Dunc.

scooby151

Original Poster:

358 posts

176 months

Tuesday 22nd November 2016
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Hey Dunc, thanks for the valuable information mate .
James

Gc285

1,216 posts

192 months

Saturday 26th November 2016
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So what is the weight of a clubsport?