Tyres

Discuss and exchange views and technical information about our cars.

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Ethanol
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Tyres (again)

Post by Ethanol » Tue Feb 26, 2019 10:58 am

I believe the 79 Scimitar should have 185 80 14's but that was not what was on am I correct?


When you increase the compression of any engine you make it more thermodynamically efficient, that makes it more powerful.

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Post by scimjim » Tue Feb 26, 2019 11:40 am

as original, yes - 80 profile are very thin on the ground now though, so you won't find many on that size anymore.


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Post by Roger Pennington » Tue Feb 26, 2019 11:50 am

Yes, as Jim says, 185/80HRx14 are very scarce - the only commonly available one that I'm aware of is the Vredestein Sprint Classic. A more popular general choice seems to be 195/70HRx14 (assuming standard wheels/usage).


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Post by Ethanol » Tue Feb 26, 2019 12:33 pm

My car had 195 70HR 14's on the front and wider 70HR 14's on the back a typical solution my mechanic says I had no problem getting 185x80HR14's, in fact, they were the cheapest, not £50 a corner. I might put 205x80HR14's on the back next as the 80HR14's make the speedo read right


When you increase the compression of any engine you make it more thermodynamically efficient, that makes it more powerful.

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Post by Roger Pennington » Tue Feb 26, 2019 2:41 pm

Worth checking what you're getting - cheap 185/80HRx14 may well be van tyres.....


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Post by *JP* » Tue Feb 26, 2019 2:49 pm

Ethanol wrote:
Tue Feb 26, 2019 12:33 pm
My car had 195 70HR 14's on the front and wider 70HR 14's on the back a typical solution my mechanic says I had no problem getting 185x80HR14's, in fact, they were the cheapest, not £50 a corner. I might put 205x80HR14's on the back next as the 80HR14's make the speedo read right
The only "cheap" 185/80x14 tyres I can see are either T rated or van tyres.All the H rated ones are expensive,hence the advice to go to 195/70/14 H,the small difference in rolling radius will not be significant.

If you know of good priced 185/80/14 HR ones please give us a link.



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Post by *JP* » Tue Feb 26, 2019 2:55 pm

Roger Pennington wrote:
Tue Feb 26, 2019 11:50 am
Yes, as Jim says, 185/80HRx14 are very scarce - the only commonly available one that I'm aware of is the Vredestein Sprint Classic. A more popular general choice seems to be 195/70HRx14 (assuming standard wheels/usage).
Michelin MXV-P are available.... at £162 each.



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Post by Roger Pennington » Tue Feb 26, 2019 5:58 pm

Yes, TBH I didn't mention them, as the price of the Vredesteins normally seems to induce derision in most Scimitar owners; not much chance anyone is going to opt for a tyre that's now significantly dearer! In addition, in the past, I actually had a set of MXV-P (in fact the spare on the mulberry car is still one of them). I didn't particularly like them - they were certainly hard wearing, but lacking in grip, and the sidewalls seemed to be particularly squidgy, which mucked-up the handling as well. The Vredesteins are much better (and I believe they are used as the control tyre in a class of classic Jaguar racing?).
IMHO 195/70 gives a nice balance of grip and control, I'm not convinced that 6" rims are really wide enough to fully realise the potential of 205s (I use 205s on the 15x7 rims on the Yellow Peril)


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Post by roymck » Tue Feb 26, 2019 6:32 pm

I agree Roger , back in the day I ran 205/70/14 Michelein XWX tyres on the SE5 on standard rims I was better off then . On standard rims they wallowed as the sidewalls were pulled in somewhat . I changed to 7 inch wide rims and this put the sidewalls at a better more vertical orientation this stiffened the handling up no end .



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Post by Roger Pennington » Tue Feb 26, 2019 7:11 pm

Agreed, when I first bought the 205s they were on 15x6 Middlebridge wheels, then I changed to the 15x7 Compomotives, and had the tyres swapped over, and the difference was quite an eye-opener! :)


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Post by Ethanol » Wed Feb 27, 2019 4:27 pm

Roger Pennington wrote:
Tue Feb 26, 2019 2:41 pm
Worth checking what you're getting - cheap 185/80HRx14 may well be van tires.....
Yes, some are, but considering it's really a platform for ethanol conversion a limited mileage testbed I'm happy, next time I might go with Dunlop.


When you increase the compression of any engine you make it more thermodynamically efficient, that makes it more powerful.

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Post by Roger Pennington » Wed Feb 27, 2019 5:56 pm

Would be wise to check that your insurers are happy with that too.


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Post by Ethanol » Fri Mar 01, 2019 1:20 pm

Roger Pennington wrote:
Tue Feb 26, 2019 11:50 am
Yes, as Jim says, 185/80HRx14 are very scarce - the only commonly available one that I'm aware of is the Vredestein Sprint Classic. A more popular general choice seems to be 195/70HRx14 (assuming standard wheels/usage).
I've put these
Condition:
New: A brand-new, unused tyre that has never been mounted on a vehicle. See all condition definitions
- opens in a new window or tab
Aspect Ratio: 80
Wet grip performance (A-G): C Manufacturer Part Number: 1858014
Speed Rating: T: max 118 mph Brand: Unbranded
Rim Diameter: 14 Reference OE/OEM Number: 185 80 14
Vehicle Type: Car Tyre Width: 185
Load Index: 91 Tyre fuel efficiency (A-G): E
Fitting Included: Yes External rolling noise (dB; class): 70dB
They seem good enough to sit on my drive and only £41 a corner.


When you increase the compression of any engine you make it more thermodynamically efficient, that makes it more powerful.

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Post by Roger Pennington » Fri Mar 01, 2019 2:47 pm

So presumably you've informed your insurers that you'll be changing to T-rated tyres? They may well be happy, but they really should be told, as it's a two-grade step down from H-rated, which have been oem spec since the Se5 changed to the 5a. Mind you, if they really are only going to "sit on my drive" and not be driven, then perhaps it doesn't matter (though I'm surprised you bothered changing in that case?).

In any case I would have thought that size was going to be way under-tyred for the power figures you're talking about in your other threads?


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Post by Ethanol » Fri Mar 01, 2019 4:34 pm

Roger Pennington wrote:
Fri Mar 01, 2019 2:47 pm
So presumably you've informed your insurers that you'll be changing to T-rated tyres? They may well be happy, but they really should be told, as it's a two-grade step down from H-rated, which have been oem spec since the Se5 changed to the 5a. Mind you, if they really are only going to "sit on my drive" and not be driven, then perhaps it doesn't matter (though I'm surprised you bothered changing in that case?).

In any case, I would have thought that size was going to be way under-tyred for the power figures you're talking about in your other threads?
I'm told it needs an MoT even to sit in my parking spot, and the roads aren't that good in Cornwall. I'm told Van boots stiffen up the steering, Honestly, I didn't notice the T, and didn't know what it meant, I skimmed the specs but thought 118mph I'll never go that fast Cornwall being lacking in motorway. The power its for driveability, it comes back to living in Cornwall.
The ethanol engine is sitting in a stand and will need an EFI system before it can be put in a car.


When you increase the compression of any engine you make it more thermodynamically efficient, that makes it more powerful.

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