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H1 vs HS1--carb confusion

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Sarastro

Sarastro

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My Bugeye shop manual lists the carbs for my car as type H1 (it actually says HI--an obvious misprint, but it leaves me wondering what other errors might have been made). My Haynes manual says it has type HS1. From the figures in the little blue book on SU carb tuning, it appears that I do have H1 carbs, and it isn't clear that an HS1 even exists.

So....the question: first, am I correct in my conclusion that I have an H1 carb on a stock, 1960 bugeye? Second, is there really a type HS1 carburetor? Or are frequent references to it just an error, since the later cars use HS type carbs? Finally, if the HS1 does indeed exist, was it used on any sprites?
 
Original 1960 Bugeye 948 should have H1 Carbs. I've never heard of an HS1, and the natural progression was from the H1's to HS2's.
Maybe someone can prove me wrong, but as far as I know, the HS1 never existed.
Jeff
 
I've also seen the Bugeye carbs called H2, with the later ones called HS2.
 
Drew, there<u> was </u>an H2 carb, but it was never fitted to the Sprite, with the possible exception of the Sebring Sprite the factory ran in 1960. The H2 was an early '50's carb, that may have carried into the late 50's, early '60's, but as far as I know the Sprite only got H1's, and then HS2's, until the 1500 came along with the single ZS.
Jeff
 
That makes sense, Jeff. I was always confused by that. I just hunted through my books, and I think it may just be the Moss catalog on their specs page that lists a H2 as the Bugeye carb. My thing to learn today.
 
Drew, my admittedly old Moss catalogue (1998) lists only two carbs for the A series cars. The H1, as "Bugeye Only", and the HS2's for all the rest. Maybe Hap will jump in with some more definitive information.
Jeff
 
Page #4 of the current catalog lists H2 for Bugeye. This is their page of general spec data.

On their carb page (#20) they do list it as a H1. Haven't seen the H2 anywhere else, so that first page is probably just a typo.
 
I'm glad to see that the question is confusing. It's not just me.

The thing that really motivated this: I frequently see people selling "HS1" carbs on eBay--but they look to me like what I have on the Sprite, which seems pretty clearly to be the H1. Then, that "HS1" entry in the Haynes manual. Sigh.
 
While we are at it, I am sure there is someone knowledgeable enough to illuminate us on what the "S" designation defines as a difference from the "H" carb???
 
S = Spring loaded, as opposed to the fixed type needle in the H and HD.
 
See what happens when I read too much! Got that from the Des Hammill book, probably why I've read almost every SU book produced and still don't understand them....
 
H = original. I believe the H designates horizontal or side draft.
HiF = Integrated float chamber
HD = Diaphram jet
HS = Separate hose from bowl to jet
Note - H1 & Hi are not the same. The number after the letters is the choke diameter in eights plus one. EG - H1 = 1 1/8" bore. H2 = 1 1/4" bore. H4 = 1 1/2" bore. H8 = 2" bore.

H, Hi, HD, & HS would all have a bore size number following the model number. HiF4 would be integrated float with 1 + 4/8" bore or 1.5" bore.
D
 
Thanks, Dave. I knew that, but it was stuck in some deep, dank, recess of my mind.
Once again, you've bailed me out! /bcforum/images/%%GRAEMLIN_URL%%/grin.gif
Jeff
 
Bugeye is H1 PERIOD.
 
Original H1s were 1" bore, otherwise Dave is right. Some spring-loaded carbs were fixed jet, later floating.
 
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