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Post by nellyp on Aug 14, 2008 17:23:34 GMT 1
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Post by mini2infiniti on Aug 14, 2008 17:27:44 GMT 1
Yes you can but you will need to buy 2 more studs with nuts to match. And also a single gasket (unless you stripping it down first, then you will need 3).
You need to measure the hole of your inlet manifold too to check the two will line up. No good having a 1.75" carb to fit a 1.5" manifold!
I have countless pictures and descriptions of the carb you got, so if you need help, holler at me on the PM.
I need a carb like yours, it even has the curving bit for the throttle cable! ;D
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Post by nellyp on Aug 14, 2008 17:55:27 GMT 1
I don't understand where I'm gonna put the 2 extra studs, I think the manifold only has 2 studs. Does this mean it's a manifold for a 1.5?
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Post by nellyp on Aug 14, 2008 17:59:34 GMT 1
Thinking about the manifold. Why would a 1275 engine have a 1.5 manifold when the carb fitted should have been 1.75. I also don't understand why there is a smaller carb fitted when surely it would have been easier to leave the carb on
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Post by mini2infiniti on Aug 14, 2008 18:04:09 GMT 1
Without taking it off to have a ganders you can't be sure. My mini had a 1.75" inlet manifold, exhaust manifold and a few other things from a 1275 which had been bodged onto a 998 engine.
When you seperate the carb from the inlet manifold and clean off the muck and old gaskets you will see there are 4 holes, 2 of which will be in use for the current carb and 2 which were buried in gunk and lose debris most likely.
You are going to need 3 new gaskets to bolt the 1275 carb on. 1 goes between the inlet manifold and the spacer, the next one goes between the spacer and the throttle plate and finally the last last goes between the throttle plate and the carb. These are pennies on ebay!
Looking at your pics before I post this, what inlet manifold do you have on there?
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Post by nellyp on Aug 14, 2008 18:33:50 GMT 1
I really don't know but to me it looks like the one off a 998, so perhaps it was never changed. But it definately has only 2 studs
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Post by mini2infiniti on Aug 14, 2008 18:39:01 GMT 1
I dont have a pic of the manifold itself, I only have these at the moment :   |
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Post by nellyp on Aug 14, 2008 18:53:03 GMT 1
I thought the part on the right in the bottom pic was the maifold...oopps. But the square plate on the carb with the 4 holes fixes to the left hand part with 4 studs. On mine the part on the right only has 2 studs, and the plate on the carb only has 2 and is not square. This is getting more confusing by the minute. I am going to try to get piture of this so it is clear about the difference
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Post by mini2infiniti on Aug 14, 2008 18:58:37 GMT 1
The only part you can salvage is the inlet manifold which should, if its a 1.75" one, have the 4 stud fitment you need.
Without taking the carb off it's difficult to see what your working with.
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Post by jc1380s on Aug 14, 2008 19:23:17 GMT 1
I may be stating the obvious here but I always understood a manifold for a HIF series SU Carb had the 4 studs fixings and a manifold for the older HS series SU Carb had the 2 stud fixings.
I assumed that you couldn't mix 'n' match them and had to have the correct series Carb and gaskets for the type of manifold fitted ?
I may be wrong here so if anyone knows different feel free to put the record straight.
jc
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Post by dai9fxey on Aug 14, 2008 21:37:54 GMT 1
Yep. Checked my box of carbs and all HS4's have diagonal fixings,2 studs.
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Post by silversaxo on Aug 15, 2008 0:47:52 GMT 1
the carb that nellyp has with the 4 stud is off a metro, and if you fit it 2 a mini it can hit the crossmember in the engine bay so large hammer is needed ;D ;D
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Post by nellyp on Aug 15, 2008 0:56:16 GMT 1
OK so I can assume that I have the standard HS4 carb, and to fit a 1.75 carb (which I have been told I need) then I have to fit a different manifold and exhaust. Do we think this was done because the person who fitted it didn't want to spend the money on the new exhaust and manifold? How much do you think this will cost (parts only) and will it be worth it.
The car is for my misses and it accelerates well for her and a top end of 90mph so will this make any difference as I am only thinkiing about it as the idle settings can't be set as the garage thinks I need a new carb. The work is no problem it's just the cost. Cheers
neil
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Post by silversaxo on Aug 15, 2008 1:05:05 GMT 1
you can fit a 1 3/4 carb with a 2 stud fixing so you can keep the inlet ex man if money tight
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Post by nellyp on Aug 15, 2008 11:55:41 GMT 1
That sounds the best route. Any idea where I can get one, will it have to come off a mini or a metro. And finally does anybody know a carb number for one. i just changed the oil pressure switch on the mini and couldn't start the engine. Heart attack time, turns out the battery was a bit dead so I jumped it with my other motor.
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Post by nellyp on Aug 15, 2008 12:01:58 GMT 1
Yep. Checked my box of carbs and all HS4's have diagonal fixings,2 studs. can you get a 1 3/4 HS4 or is there a number for a 1 3/4 with the 2 stud fixing |
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Post by mini2infiniti on Aug 15, 2008 14:48:08 GMT 1
Ebay search  Mine looks like this. HIF44 is the best for a 1275, so you got the right carb you just need to sort out the inlet manifold and probs exhaust too.
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Post by dai9fxey on Aug 15, 2008 20:45:17 GMT 1
I dug my old set of Twin 1/34 (HS6) out earlier. As you can see, even this type won't fit your manifold.   I used the diagonal stud holes to fix the carbs on. |
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Post by huwjenks on Sept 8, 2008 15:58:55 GMT 1
im using a HIF38 (4 stud) going onto a standard 998 manifold (2 stud) and havnt had any problems with the gaskets.
So long as your putting a 1.5" carb onto a 1.5" manifold or 1.75 onto 1.75 it should be fine.
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