[Rovernet] Why HS8's on the Rover TC2000?

[Vern Inkspot]

A “proper” HD8 has an actual idle circuit which was removed for the P6 application.

Yours
Vern

> On Oct 6, 2024, at 8:24 AM, Tom Rymes via Rovernet <rovernet at rovernet.org> wrote:
> 
> I remember an incident when a friend asked me about HD8s from an early 2000TC like mine. He was putting three of them on an Austin Healey, but it turns out that Rover had made modifications from a garden-variety HD8, IIRC, which was causing issues with making them work on the AH.
> 
> Does anyone have details?
> 
> Tim
> 
>> On Oct 6, 2024, at 7:20 AM, Steven Dibdin via Rovernet <rovernet at rovernet.org> wrote:
>> 
>> Because bigger isn’t always better for carbs. You’ll have more power at higher revs, but less torque at lower and mid range, it’s also why the idle on a 2000TC is rougher than on a 2200TC with HIF6s. Lower air velocity over the jet meant less effective fuel mixing at partial throttle openings. 
>> 
>> S-
>> 
>> Sent from a small screen, please excuse any typos. 
>> 
>>> On Oct 6, 2024, at 01:07, pierre janusz via Rovernet <rovernet at rovernet.org> wrote:
>>> 
>>> 
>>> Why not just for more power?
>>> 
>>> On Saturday 5 October 2024 at 19:58:40 GMT-7, Gordon Reddy via Rovernet <rovernet at rovernet.org> wrote:
>>> 
>>> 
>>> Yes, thats what I remember, rpm related lean mixture and engine damage. Thanks Steve!
>>> Gord
>>> 
>>> On Sat, 5 Oct 2024 at 10:30, Steven Dibdin <sdibdin at gmail.com <mailto:sdibdin at gmail.com>> wrote:
>>> There’s some evidence that they went for the 2” Days because harmonics at higher revs caused the pistons to drop in 1.75” carbs. That leaned out the mixed and burnt holes in the engine pistons. The larger carbs could handle the resonance and stay stable. 
>>> Sent from a small screen, please excuse any typos. 
>>> 
>>>> On Oct 5, 2024, at 13:14, Gordon Reddy via Rovernet <rovernet at rovernet.org <mailto:rovernet at rovernet.org>> wrote:
>>>> 
>>>> 
>>>> Hi All,
>>>>     I am sure this question has been regularly posted in the past but here it is again. Why the 2" carbs on a 2 litre engine? Rover never did anything without a good reason. I believe I read somewhere in the dim, dark past it was because of a lean spot in the rpm range???
>>>> Cheers,
>>>> Gord
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