Jump to content


Photo
- - - - -

Hif44 High Idle


Best Answer macaldron , 09 June 2018 - 08:37 PM

Mr. Moke Spider, you are The Man! Soldered the poppet valve and perfect 1000 rpm idle. I'd buy you a pint if you were closer to Seattle USA. Thank you! Go to the full post


  • Please log in to reply
5 replies to this topic

#1 macaldron

macaldron

    Just On Tickover

  • TMF+ Member
  • Pip
  • 8 posts
  • Location: Seattle

Posted 08 June 2018 - 07:04 AM

Hi - I have an issue with my 1330 engine I am trying to sort, and could use some help.  I have a fresh 1330 with a hif44 carb, sw5 cam, big valve 12g940 head, 1.3 roller rockers set to 15 thou. Engine wants to idle at 1600 -1700 rpm, and won't come down anywhere near 1000. Here's what I've checked so far (in addition to hunting and searching the forum and web for clues...): idle screw is out (not touching throttle cam), choke is off (cable is slack), no signs of air leak from carb to intake area, intake to head area, crankcase breather (connected to carb), dizzy vac (either end), spindle ends, choke area.  Mixture is close (plugs are chocolately and lifting piston raises rpm slightly then settles at orig speed (although high)).  Damper cap is LZX 1511.  Dashpot oil is sae30, spring is red. Needle is BCE. Timing is close (10 deg at 1700, vac off). Coil is new, elec dizzy.

 

Here's what I'm not sure of that might be contributing: butterfly has poppet valve with spring that seemed soft, piston has about 1/8" vertical free play prior to damper being engaged - not sure if that is normal. butterfly valve has some side to side play when opened. Car has slight run on, but if I back off the mixture, the run on lessens. It's getting too much air from somewhere...but where? I am missing something...but what?

 

Thanks!!!

 

Mike



#2 Moke Spider

Moke Spider

    Crazy About Mini's

  • TMF Team
  • PipPipPipPipPipPipPipPipPipPip
  • 7,294 posts
  • Location: NSW

Posted 08 June 2018 - 07:54 AM

 

Here's what I'm not sure of that might be contributing: butterfly has poppet valve with spring that seemed soft,

 

 

Hi Mike,

 

I think you'll find this to be your issue. Solder it shut or change it for a plain one.



#3 macaldron

macaldron

    Just On Tickover

  • TMF+ Member
  • Pip
  • 8 posts
  • Location: Seattle

Posted 09 June 2018 - 08:37 PM   Best Answer

Mr. Moke Spider, you are The Man! Soldered the poppet valve and perfect 1000 rpm idle. I'd buy you a pint if you were closer to Seattle USA. Thank you!

#4 Moke Spider

Moke Spider

    Crazy About Mini's

  • TMF Team
  • PipPipPipPipPipPipPipPipPipPip
  • 7,294 posts
  • Location: NSW

Posted 09 June 2018 - 09:50 PM

Mr. Moke Spider, you are The Man! Soldered the poppet valve and perfect 1000 rpm idle. I'd buy you a pint if you were closer to Seattle USA. Thank you!

 

Good work - you're very welcome :shades:

 

Love to catch up for a beer one day :D

 

Come to Aust and I'll take you on a safari
 



#5 nicklouse

nicklouse

    Crazy About Mini's

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPip
  • 9,643 posts
  • Location: Not Yorkshire

Posted 09 June 2018 - 10:03 PM

i would change the butterfly now that you know what the issue was as it is one rather large obstruction.



#6 macaldron

macaldron

    Just On Tickover

  • TMF+ Member
  • Pip
  • 8 posts
  • Location: Seattle

Posted 10 June 2018 - 03:41 PM

Yep. Ordering a new one today. Thanks!

Edited by macaldron, 10 June 2018 - 03:42 PM.





0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

Mini Spares