Jump to content


Photo
- - - - -

38 38 webber


  • Please log in to reply
7 replies to this topic

#1 Blas671

Blas671

    Newbie

  • New Members
  • Pip
  • 8 posts
  • Location:Las Vegas
  • Cars:1985 st nissan pickup

Posted 23 April 2017 - 07:20 AM

i recently did a carb swap everything is on point ..... occasionally lag when rev up in neutral then second rev all cleared up.....



#2 Doctor510

Doctor510

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 659 posts
  • Location:Mesa, AZ
  • Cars:Many 510's

Posted 23 April 2017 - 09:40 AM

Check your accelerator pump discharge nozzle to see if it squirts 



#3 tr8er

tr8er

    Datsun Mechanic

  • Senior Member
  • PipPipPipPipPip
  • 6,905 posts
  • Location:Hawaii
  • Cars:'71 PL510; 01 Frontier 4X4

Posted 23 April 2017 - 10:25 AM

That's somewhat to be expected of that carb from what I've experienced. I think the vaccuum at idle is a bit low for the 38. It works like a beast when you are driving though right? I think synchronous barrels are the issue. Having a primary jet gives the 32/36 the advantage at startup.
  • LTJ likes this

#4 banzai510(hainz)

banzai510(hainz)

    L motor God

  • Senior Member
  • PipPipPipPipPipPipPipPipPipPip
  • 15,058 posts

Posted 23 April 2017 - 12:32 PM

I had a 38/38 on a L16 and I had issues on hills as open to fast if bogs out. otherwise it was a cheapest HP increase ever.

 

increase the idle timming  if possible.


Throw on some Weber sidedrafts, Rising Sun hood.... call it good

#5 racerx

racerx

    Senior Member

  • Senior Member
  • PipPipPipPipPip
  • 4,436 posts
  • Location:NorCal
  • Cars:71 Datsun 510 and 65 Mustang Fastback

Posted 24 April 2017 - 09:30 AM

maybe 38/38 is a wee bi too much for the engine.  Not sure what your set-up is.  You can also call PierceManifold and talk to their tech guy.



#6 spdcrazy

spdcrazy

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 309 posts
  • Location:Denver, Colorado
  • Cars:30zxtt, Subaru wagon turbo, 71 Datsun 521, 76 pinto wagon

Posted 25 April 2017 - 04:56 AM

I can't give any advise on why this might be, but on my l20b, with no engine work other than bored .30 over and ele dizzy, it ran fine. really woke it up. and had zero lag. this was using the smaller port intake, an emissions head, and a cast exhaust manifold. I went from a 32/36 and was really shocked at the improvement, if you are getting lag, i'd be checking some things, vac leaks maybe?



#7 datzenmike

datzenmike

    KING RAT

  • User Administrator
  • 70,316 posts
  • Location:Vancouver Island
  • Cars:'74 710 sedan, '76 710. prevoius... '78 620, '71 521, '68 510 new '76 B-210

Posted 25 April 2017 - 08:02 AM

The 38/38 is a small V8 or 6 cylinder carb. Bogging is to be expected on smaller displacement engines as not enough air is being drawn through the venturies to form a vacuum to draw fuel in and it 'falls on it's face'. You can try a larger squirt from the accelerator pump to get you through this lean area or learn how to 'drive' it. Try 1/3 on take off and add to full throttle in stages as the revs build. Experience will dictate how fast you can add full throttle.


Posted Image

#8 toylet

toylet

    Advanced Member

  • Members
  • PipPipPip
  • 86 posts
  • Location:AZ
  • Cars:datsun 510(s)

Posted 28 April 2017 - 03:44 PM

I have a 38 38 on my lz2.2. I installed a wide band and found that it was going lean at 1/4 throttle. changed the mains.. all is good