John
1948 posts
Joined: 28/05/2006 16:49:46
Location: cambridge United Kingdom (Excluding channel Islands)
850cc Manifold
metro alegro use a combined manifold with a hif6 or hif4 on 998cc models. the intake manifolds of these hif6 are far to big for a 1.1/4" carb as it is 1.3/4" you could fit it on a 1.1/2" manifold ok tho. best bet tho is to cut the intake off the exhaust manifold, chuck the old exhaust one, and fit a lcb manifold cost about £40 from here, then if he needs an exhaust get an rc40 kit £50, it will bring power to about 40bhp if setup well compared to standard 34bhp, as heat is off intake and exhaust is better flowing, it wont run well on large bore at all (2"), 1.75" medium bore exhaust will be better suited and small bore manifold lcb (has medium bore output), medium bore if he wishes but never large bore.
Posted: Oct 15, 2007 10:40 PM
jet of hif carb
do u have to strip the fuel sender out in order to remove the jet, and how easy are they to remove. i bourt a hif6/44 from scrap yard and wanna rebuild it before i do what is equal to a stage 1 kit. as iv read the jet is quite prone to wear on hif carbs as needle rubs more.
Posted: Nov 04, 2006 06:02 PM
dan
34 posts
Joined: 31/03/2007 12:08:18
Location: seascale United Kingdom (Excluding channel Islands)
what size air filter
i have a 1987 austin mini advantage what size cone air filter would i need. is it a HS4 H4 HIF38 1.50" or is it the HIF44 HIF6 1.75" thanks for the help replies needed asap thanks
Posted: Apr 28, 2007 11:14 PM
Twin HIFF's linkage
Sorry to correct u again but thats an hif4 (1. 4/8") which is an hif38 (38mm)in metric. The same way as the hif6 (1.6/8") is the same as an hif44(44mm), hif4 is a 1.5" bore not 1.3/4" of hif 44. they only fitted 1.5" su carbs to the mg b 1.8. after market twin hs6's(1.3/4) are avalible. to get a bit more out of twin hif4 or hs4's gd idea to work on then to free flow insides acording the instructions to david vizards a series book. then you have high gas speeds and good flow.
Posted: Feb 06, 2007 01:16 PM
Woody
73 posts
Joined: 29/01/2008 18:58:20
Location: NORWICH United Kingdom (Excluding channel Islands)
!!!!!!!!!!!!!!!!!!!!HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!
Hi,
Just 2 very quick questions-
I have just aquired a new mini and i was replacing some of the parts only to find deveral missing which i have managed to reeplace... But the olny part i found which i caouldn't replace is the seal going from the carb to the air filter...
While i was looking around i found a K&N HIF6/44 CONE K&N FILTER and other items the same and i was just wondering whether that would be better..
Also i have found that in the speedo drive housing on the side of the gearbox some daft twit have seared a bolt off and what ever i tried couldn't get it out... The question is whether i can get the side off with out haveing to take the whole engine out???
Thanks in advance!!!
Posted: Feb 23, 2008 06:13 PM
Glen
10 posts
Joined: 01/10/2004 10:52:09
Location: Nr. Winkleigh United Kingdom (Excluding channel Islands)
sw5 cam
Hi, I built up a hillclimber with this cam, 1275, 1.5ratio roller tip rockers, 33mm inlets, HIF6, 10.8:1. On the rollers it gave peak power (90hp at flywheel) at 5400rpm. It would idle far slower than youd ever want it to idle and pulled through to 6400rpm (the limit I set due to std material valves) very well. Personally Id go with something lumpier like a sw10 even for road use. But anyway, very docile and started SO easily. MPG fantastic etc etc. Cheers, Glen.
Posted: Jul 16, 2005 01:03 PM
Finally an Engine Change. !!!
will have a hif6 carb so 1.3/4" 44mm as all metro 1275's used that carb incuding MG models as it can take aprox 100bhp b4 it starts to limit power over large bore twin chock/carb setups
Posted: Oct 20, 2006 11:46 AM
JoãoGT
9 posts
Joined: 11/02/2006 21:27:02
Location: Mem-Martins Portugal
SU
Hi ! Well, looking at a hif38 and a hif44 you should notice a larger intake ! :) SU also did a HS6 and HIF6 carb which are 44mm intake as well. The HS4 is 38mm just like your Hif38. Cheers, JoãoGT
Posted: Apr 03, 2006 11:35 PM
Ian
11 posts
Joined: 05/12/2005 19:53:39
Location: United Kingdom (Excluding channel Islands)
WOW, you have done some major work, thanks for sharing it with me
Sorry i have not replied, i have been tied up with AS modules, my mini getting sprayed and general other stuff thats a pain in the backside. Thanks very much for that, you have really dome some work and research, however i have been reading tuning the a-series engine (how sad) and apparentley a good head to use is 998 cooper head. In the example angne build section, a good 998 street engine can produce 60bhp at the wheels, using powermax pistons, lightening the crank and rods, a kent 276/piper 270 cam and a single, SU hif6 carb. This seems more sutable for me because i want a more simple engine as its my first, i will port it out suitably, and hopefully it will provide me with a free-flowing head. I hope your uni course goes well for you, and i would be very interested to hear about how this project turns out. By the way, are you doing motorsprt engineering, because thats the course i hope to take. If you do it would be greatley apreciated if you could give me some info on it. Again, many thanks, Ian
Posted: Jan 29, 2006 09:35 PM
Barry Brown
511 posts
Joined: 23/06/2008 12:08:31
Location: New Barn United Kingdom (Excluding channel Islands)
Carb/non starter
it's worrying that you had to straighten the needle a bit. HIF carbs have a 'spring biased' needle so that it either points slightly to one side (air intake or manifold depending on type) these do not bend when adjusting the mixture. The only way to tell is take the needle out of it's guide and roll it across a flat surface to see if you've actually got a bend in it.
the problem of the engine conking out when slowing down is usually a sign of a cracked vacuum breather pipe between carb and rocker cover. people compensate for this over time by richening up the mixture or increasing the revs until it finally lets go. check the end of the breather tube where it joins the carb.
for overhauling the HIF carbs do a google search on BURLEN FUEL SERVICES. they not only have an ecellent set of online guides but you can order genuine SU spares as well. I've just overhauled an HIF6 (1.75") for a Rover working from the web info and changed the butterfly and reset the choke and float without working on this type before. The float should be 1.0mm (+/- 0.5mm) below the float chamber surface when held upside down with the needle valve in situ.
Posted: May 03, 2011 05:37 PM