Author Topic: Short g40 driveshaft .. what diameter?  (Read 94 times)

Offline AdzCM

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Short g40 driveshaft .. what diameter?
« on: July 12, 2018, 11:37:19 am »
Just wondering what diameter the short g40 driveshaft is? Is this the one that is usually uprated?

Mine is 27mm. Reason I ask is, I’ve had my polo over 8 years now (albeit, it hasn’t been used for 8 years) and I’ve been running around 200bhp for quite a while. Was 175bhp before that for a few years and circa 130 before that when running the glader. Touch wood, I haven’t snapped it yet. I do drive it hard quite often.

Diameter might not tell me anything. It could be a different metal or treated differently. Or it’s just standard and I’ve been lucky.

Or is it the thinner one with the balance weight that tends to snap? That seems more likely.


Adrian

Offline ereeiz

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Re: Short g40 driveshaft .. what diameter?
« Reply #1 on: July 12, 2018, 12:09:45 pm »
I don't know the specs, but here's a link to the group buy thread from a few years back. It has a bit of info on uprated shafts.

https://www.polog40.co.uk/forum/index.php?topic=6670.0


Link to the driveshafts on ETKA. No info on specs but you could look up the part number?

(1)   871 407 271 BX   drive shaft with constant velocity joints
Detail of the restored at the factory   left   1   G40

(1)   871 407 272 GX   jointed shaft with universal joint and absorber weight
F 80-P-000 001>>
Detail of the restored at the factory   right   1   G40
manual gearbox+
CEK

https://volkswagen.7zap.com/en/rdw/polo+derby+vento-ind/po/1993-120/4/407-30000/
« Last Edit: July 12, 2018, 12:15:35 pm by ereeiz »

Offline AdzCM

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Re: Short g40 driveshaft .. what diameter?
« Reply #2 on: July 12, 2018, 12:39:02 pm »
Cheers for that. Seems they uprate the longer driver side one. I’m just surprised mine hasn’t snapped with the power I have and the amount of stories I’ve read of snapped ones. Must rot in behind/either side of the balance weight.

Adrian

Offline ereeiz

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Re: Short g40 driveshaft .. what diameter?
« Reply #3 on: July 12, 2018, 01:21:48 pm »
Is yours turbo? From memory, the G-lader comes on sooner/ more aggressively than turbo conversions, whereas a turbo is much "softer" if that makes sense? Ultimately though, bad driving can kill stuff quicker, good driving can prolong it.

I've never been in a turbo Polo so can't really say either way, just parroting what I read somewhere.

Offline AdzCM

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Re: Short g40 driveshaft .. what diameter?
« Reply #4 on: July 12, 2018, 10:04:19 pm »
Yeah it’s turbo. It’s definitely hella aggressive though lol. Spins into third. Maybe the spinning is saving the driveshafts. It’s hard to know. Majority of the time I only accelerate hard in second gear from a rolling start. On occasion, I do gun it from standing in first gear.

I was just curious to see if my driveshaft is uprated but I just did the cv boots and the splined end looks like the standard shaft in the link you sent me of that group buy.

Must keep an eye for an uprated one again just in case. Though they’re pretty rare.

Adrian

Offline ereeiz

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Re: Short g40 driveshaft .. what diameter?
« Reply #5 on: July 20, 2018, 11:31:37 am »
Might be worth approaching a local engineering company, if it's a "project", i.e. you're not in a rush for it then someone might fancy doing it as a weekend / after hours job to learn, it might work out reasonably priced. Especially if they can then use the learning to bang a few more out and make easy money.