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How to Identify a Straight Through NH carb?
Posted: Wed Feb 20, 2019 11:03 pm
by Fozz71
Can anyone help me identify an NH carburetor and what is the way to ID a straight through carb?
Is it as simple as being able to see through it? Or are there salient features from the side to look for?
Thanks,
Jim
Re: How to Identify a Straight Through NH carb?
Posted: Wed Feb 20, 2019 11:09 pm
by Scott_Conger
Straight through on left for both pictures:
Re: How to Identify a Straight Through NH carb?
Posted: Thu Feb 21, 2019 10:23 am
by tom_strickling
What extra considerations if any are there for rebuilding a straight through ?
Re: How to Identify a Straight Through NH carb?
Posted: Thu Feb 21, 2019 10:35 am
by Mark Osterman
None really .... all the same parts. Just make sure all the little chambers are clean and plugged properly.
Re: How to Identify a Straight Through NH carb?
Posted: Thu Feb 21, 2019 10:36 am
by Scott_Conger
They rebuild just like any other NH...no different parts or adjustment.
My opinion is that they will perform only slightly better than the more common sway-back NH, often with slightly harder starting and a greater propensity to spit a little fuel when starting and sometimes when shutting down. Not always, but many people report this. I ran one for awhile on our '13 and believe it was a little harder to start. On a car with a starter, this may be less noticeable.
Re: How to Identify a Straight Through NH carb?
Posted: Thu Feb 21, 2019 7:53 pm
by Fozz71
Well I guess I am selling mine on eBay, I didn't realize it was a straight through NH. If you want a nice solid complete one- take a peek.
Thanks for the help ID'ing them, I had no idea how to tell them apart.
Re: How to Identify a Straight Through NH carb?
Posted: Thu Feb 21, 2019 8:59 pm
by Pep C Strebeck
The one that you have listed on Ebay is not an NH, a straight-thru carburetor yes, but not an NH and not made by Holley. Either a Western Auto or Simmons Super-Power, both aftermarket. There would have been a wire heating element where the brass screw is filling in the hole. Does the carburetor that you have in the listing have the small pot metal flapper in it?
Re: How to Identify a Straight Through NH carb?
Posted: Fri Feb 22, 2019 9:39 pm
by Fozz71
Where would this pot metal flapper be located at? Both butterflys are the standard steel and brass type so potmetal is gone, no wire has survived.
Re: How to Identify a Straight Through NH carb?
Posted: Fri Feb 22, 2019 10:24 pm
by Pep C Strebeck
The flapper would be located behind the choke butterfly and would mount/pivot on the small rod attached to the brass screw that can be seen in the photo below:
You can see the small rod (horizontal) in this photo. This would normally be behind the choke butterfly but that has been removed in this photo.
The flapper is supposed to help with low speed idle and make the carburetor run/operate smoother.