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1275 motor with 1 1/2 carb?
https://www.ausmini.com/forums/viewtopic.php?f=2&t=31837		 Page 1 of 2
Author:  GT [ Thu May 17, 2007 11:19 am ]
Post subject:  1275 motor with 1 1/2 carb?
I think I need to remove my Weber and do a proper rebuild on it.

I have nothing to put on the 1275 motor, other than a very good HIF38 on alloy manifold.

Will the 1275 run with this carb?

I just want to safely be able to drive to work and home again. Loss of power would be obvious, but if the car will run OK then I will have time to strip and rebuild the Weber properly.
Author:  Matt68 [ Thu May 17, 2007 11:23 am ]
Post subject: 
Yep, it will be fine until you are in the much higher rev range. (5k plus)

They came standard with this size carb (single) and the 1100s came standard with a single 1.25" carb. (at least the two motors in my shed did :D )

It will be fine, just not ultimate performance. You might be surprised how good it is!

Matt
Author:  rehab1964 [ Thu May 17, 2007 11:28 am ]
Post subject: 
my wolseley 1300 with 1310 engine currently runs a single 1.5 - goes fine, about to replace with a 1.75 so I hope to be able to tell just how much difference that will make
Author:  czerial [ Thu May 17, 2007 11:31 am ]
Post subject: 
as u say anton it wont be great for out and out power, but its still gunna be
fine!

I had a 1.5 on elmos 1293 with 266 and it was fine, u noticed the difference in performance straight away, but it still went quite well. Steve had a 1.5 on his 1360 black van with big cam and head work and i think that went quite well on the road
Author:  mickmini [ Thu May 17, 2007 11:45 am ]
Post subject: 
Anton

I would be wary of doing that. You don't know what the cam and compression ratio in that engine are, and just sticking another carby on without tuning it could result in it being too lean and the ultimate consequences of that would be disastrous.

The rebuild kit i got from Hardimans took about 2 hours for me to go through everything starting from scratch without a book to read before hand (and it worked just fine on the dyno!). I would suggest that you could run the kit through on a weekend without any trouble, especially if you have read Kevs book beforehand.

Ultimately you want to have the Weber jetting sorted out, but to put the SU on without tuning could put you in a much worse situation than not tuning the weber at this stage. Especially if it is just so you have the time to run the kit through the weber prior to the tuning exercise.

cheers
michael
Author:  GT [ Thu May 17, 2007 11:45 am ]
Post subject: 
interesting....thanks guys.

I just want a bit of breathing space so I can properly sort my Weber carb, but I NEED to drive this car every day for work. The HIF38 or another HS4 are the only spare carbs I have.
Author:  1360 LS [ Thu May 17, 2007 11:59 am ]
Post subject: 
mickmini wrote:
Anton

I would be wary of doing that. You don't know what the cam and compression ratio in that engine are, and just sticking another carby on without tuning it could result in it being too lean and the ultimate consequences of that would be disastrous.



I too would be wary but my LS was 1330 before rebuild and had a 1.5 SU on her but was needled wrongly IMO otherwise I may not have had to rebuild my engine, but it's up to you mate. I reckon the "safe not sorry" attitude is the best option for you.
Author:  aaron [ Thu May 17, 2007 12:57 pm ]
Post subject: 
Anton,
Swing past my place and throw scrappers weber on and see what you get. It is all set up for a 1275, yes it may not be exactly what you need, but it'll get you buy until get yours set up.

Cheers
Aaron
Author:  Mike_Byron [ Thu May 17, 2007 1:24 pm ]
Post subject: 
Putting Aaron's weber on is an excellent idea. It also gives you something to guage your weber by in terms of performance.

From what I have consistantly read I doubt your current weber is giving you the performance and grunt you think is. I would think that its giving you lots of induction noise and bursts of go rather than smooth power and performance all the way through the revs.

Putting on a HIF38 is fine as long as it has the right needles. But if its set up for a 998 or a 1098 then it will be way to lean at the wrong places.
Author:  GT [ Thu May 17, 2007 1:27 pm ]
Post subject: 
I didn't know you had a Weber in Scrapper. Is it still bolted on?

Not a bad idea really....I can just unbolt mine and leave the manifold on.

I have a place very close to my work who can supply Weber kits and parts too btw....
Author:  GT [ Thu May 17, 2007 1:28 pm ]
Post subject: 
Mike_Byron wrote:
Putting on a HIF38 is fine as long as it has the right needles. But if its set up for a 998 or a 1098 then it will be way to lean at the wrong places.


Yea OK...that's a fair call. Thanks Mike.
Author:  aaron [ Thu May 17, 2007 1:46 pm ]
Post subject: 
I'm home tonight, so we can do a straight swap. 15 mins max. start up drive away. no more to pay.... well you know what i mean. will be home by 5.
you will soon know if yours is the issue. and then you can have it rebuilt.
I still question the fuel pump, but if it's feeding too much we can fix that too. :wink:

Cheers
Aaron
Author:  1310/71 [ Thu May 17, 2007 2:08 pm ]
Post subject: 
That will also give you 22 days to rebuild your weber according to aaron's Hay countdown :lol:
KB
Author:  mickmini [ Thu May 17, 2007 2:15 pm ]
Post subject: 
1310/71 wrote:
That will also give you 22 days to rebuild your weber according to aaron's Hay countdown :lol:
KB


that depends if aaron and doogies plan for hay works out or not :wink:
Author:  aaron [ Thu May 17, 2007 2:23 pm ]
Post subject: 
Hay motor is already in, were very organised at the moment :wink:
The 1275 may not even go back into Scrapper after Hay is over. We may well sell it off, who knows.
Too many choices, makes for a hard desicion making
Cheers
Aaron
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