15 replies to this topic

[087dave]

Hi all, just a quick one

can you use a hs4 carb from a 998 on a 1275 or do you need a hif44

cherrs

[freshairmini]

HS4 is 1.75", HIF44 is 44mm, one is the original imperial sized version and the HIF was the updated design version in metric. So I guess it wouldn't really matter, But I'd go for the HIF for its more compact upright size, plus I suppose its a better design.

Edited by freshairmini, 16 July 2012 - 10:35 AM.

[jaydee]

Yes, HS4 with red spring and AAV or ADE needle.

[jaydee]

HS4 is 1.75", HIF44 is 44mm, one is the original imperial sized version and the HIF was the updated design version in metric. So I guess it wouldn't really matter, But I'd go for the HIF for its more compact upright size, plus I suppose its a better design.

No HS4 is 1,5"

[smartie93]

HS4 is 1.75", HIF44 is 44mm, one is the original imperial sized version and the HIF was the updated design version in metric. So I guess it wouldn't really matter, But I'd go for the HIF for its more compact upright size, plus I suppose its a better design.

HS4 is 1.5" HIF44 is 1.75". depends on the head of the 1275, standard 12g940 will be fine, but a more performance oriented head will be restricted by the hs4

[freshairmini]

ah sorry, my mistake, its is 1.5".

So in that case, why not use the HIF44 anyway. Allow more air through than a HS4. Has the Scope for better performance.

[smartie93]

ah sorry, my mistake, its is 1.5".

So in that case, why not use the HIF44 anyway. Allow more air through than a HS4. Has the Scope for better performance.

I ran a 1275 auto on a hs4 no problems, and when i upgraded to an mg metro manual engine i fitted a hif44 because thats what it came with originally. Bear in mind you'll need a different manifold and if like mine you had a single piece cast manifold you need a new exhaust mani as well. That cost me over £200 including a second hand hif44 (ignoring the cost for the rest of the exhaust). so the downside are potentially unnecessary expenses, check the head, if its a cooper/mg/stage2 etc its worth spending... or if you plan on upgrading :)

[AVV IT]

Use an HS4 or HIF38 on a standard/stage one 1275, and If it's modified (head/cam etc) then you'll need an HIF44. Rover fitted HIF38's (metric version of the HS4) to 1275's as standard, and only fittted HIF 44's to the cooper models. Personally I wouldn't bother with a HIFF44 on a standard 1275, it's unnecessary and you're more likely to create over-fuelling problems than gain anything in performance.

[ricekikr]

Personally I wouldn't bother with a HIFF44 on a standard 1275, it's unnecessary and you're more likely to create over-fuelling problems than gain anything in performance.

My 1275 came with a HIF44 stock. Should I be worried? (sorry noob question)

[AVV IT]

My 1275 came with a HIF44 stock. Should I be worried? (sorry noob question)

What on an unmodified non cooper 1275 as standard you mean??

.... If so then no, I certainly wouldn't be concerned, so long as it's running OK... and what model do you have by the way?

[smartie93]

Personally I wouldn't bother with a HIFF44 on a standard 1275, it's unnecessary and you're more likely to create over-fuelling problems than gain anything in performance.

My 1275 came with a HIF44 stock. Should I be worried? (sorry noob question)

No, its fine, as long as you have the correct needle, which if it came as stock i assume it would, you won't risk over fueling. Having a larger carb does not cause over fueling having the wrong needle does

[freshairmini]

my RSP cooper came with a HIF44, only reason I suggested it. Works fine.

[AVV IT]

my RSP cooper came with a HIF44, only reason I suggested it. Works fine.

I think there maybe some confusion over the term "Standard 1275 engine" here, as a "standard 1275 engine" is not the same as the "standard 1275 cooper engine", that was fitted to the cooper models. An RSP won't have the standard 53BHP engine (as fitted to the non cooper models), it will have the higher compresion 65BHP cooper version and therefore has a higher demand for fuelling, which is why it was fitted with the HIF44 as standard and why it would work fine in your case.

If you take the HIF44 from your RSP with it's BFY/BDL needle and fit it to a standard non cooper 1275 engine, it will not run particularly well. I guess you could try fitting a leaner needle to a HIF44 on a non cooper engine, but there seems little point and in which case you may as well stick with an HS4 or HIF38 and upgrade to an HIF44 if and when you make mods that require it.

If however we're actually talking about a "standard 1275 cooper engine" here though, then a HS4 will not be sufficient and a HIF44 will be needed instead.

No, its fine, as long as you have the correct needle, which if it came as stock i assume it would, you won't risk over fueling. Having a larger carb does not cause over fueling having the wrong needle does

I could be wrong but I'm not aware of any non copper model that was ever fitted with a HIF44 as standard. Surely therefore putting a HIF44 on a standard non copper engine would mean that it automatically had the wrong needle in it, because the stock needle for a non copper 1275 would be something like an AEM, where as the stock needle that would come with a HIFF 44 would be something like a BFY or BDL??

Again are we talking about a "standard 1275" or are we actually talking about as "standard cooper 1275" here??

Edited by AVV IT, 16 July 2012 - 01:51 PM.

[smartie93]

No, its fine, as long as you have the correct needle, which if it came as stock i assume it would, you won't risk over fueling. Having a larger carb does not cause over fueling having the wrong needle does

I could be wrong but I'm not aware of any non copper model that was ever fitted with a HIF44 as standard. Surely therefore putting a HIF44 on a standard non copper engine would mean that it automatically had the wrong needle in it, because the stock needle for a non copper 1275 would be something like an AEM or ABP, where as the stock needle that would come with a HIFF 44 would be something like a BFY or BDL??

my RSP cooper came with a HIF44, only reason I suggested it. Works fine.

But an RSP cooper won't have the standard 53BHP engine as fitted to the non cooper models though, it will have the higher compresion 65BHP cooper version and therefore has a higher demand for fuelling, which is why it was fitted with the HIF44 and why it would work fine in your case. If you take the HIF44 from your RSP with it's BFY/BDL needle and fit it to a standard non cooper 1275 engine, it will not run particularly well. I guess you could try fitting a leaner needle to a HIF44 on a non cooper engine, but there seems little point and in which case you may as well stick with an HS4 or HIF38 and upgrade to an HIF44 if and when you make mods that require it.

I'm not aware of any standard 1275s coming with 44's either but hey i've been wrong before haha

But yes if a 44 off a performance variant was put straight on a standard 1275 then there would be a problem, but changing a needle's not hard.

I would stick with a HS4 unless like i said, your upgrading

[ricekikr]

My 1275 came with a HIF44 stock. Should I be worried? (sorry noob question)

What on an unmodified non cooper 1275 as standard you mean??

.... If so then no, I certainly wouldn't be concerned, so long as it's running OK... and what model do you have by the way?

Mainstream Cooper. So guess it doesn't apply to me.