Hif38 Carb Running Lean
#1
Posted 29 January 2011 - 04:59 PM
#2
Posted 29 January 2011 - 05:55 PM
It should be possible to to get the mixture roughly correct by screwing the mix screw in and out to get the fastest consistent idle point. If you still think its not rich enough, check for air leaks.
#3
Posted 29 January 2011 - 05:58 PM
#4
Posted 29 January 2011 - 07:04 PM
#5
Posted 30 January 2011 - 12:09 PM
What sort of 1275 are you running, a HIF38 is adequate for a standard engine & was fitted to the late non cooper 1275's as standard. But if you are running a cooper or MG metro unit, then as suggested above a HIF44 is really what's needed. You might also want to consider a richer needle, particularly if you have any air flow mods such as a high flow air filter, gas glowed manifolds or performance exhaust etc.
I'm not sure. I bought it from a guy locally who stripped it out of a car he had aquired. As the car is still in building stage, i haven't actually driven it yet to see how well it goes. I think it may have had some tuning as the engine number has been machined off the block. I want to remove the head sometime and measure the pistons to find out what it really is.
Going back to the lifting pin, it sounds like i'm at fault by pushing the pin too far!
I'll have another go when i get the chance to see what 0.8mm does.
Thanks for your replies guys.
#6
Posted 30 January 2011 - 09:03 PM
It does have a pancake type K&N filter and non standard exhaust but original exhaust manifold. It's a bit of a mish-mash, but after discovering only last week it was an MG Metro engine I can at least set the valve clearance to what they should be.
I'd be interested to see if you get the HIF38 behaving as it should. In the meantime I'll be looking for a HIF44, although apparently my father in law has a pair of twin carb down in his shed....somewhere?
..but from I've read on the mini forums that i regularly trawl, the only way to get right is on a rolling road.
#7
Posted 30 January 2011 - 09:10 PM
#8
Posted 30 January 2011 - 09:29 PM
Without a Haynes on the MG Metro, guidance I've read is 13 thou on inlets and 16 on exhaust.
The big difference is also as it's most likely unleaded and that I'm using Valve Master, should help slow down any addition wear on the seats and constant adjustments.
...but still learning, so happy if anyone has some advice.
#9
Posted 30 January 2011 - 10:06 PM
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