-
The Roadster Factory Recovery Fund - Friends, as you may have heard, The Roadster Factory, a respected British Car Parts business in PA, suffered a total loss in a fire on Christmas Day. Read about it, discuss or ask questions >> HERE. The Triumph Register of America is sponsoring a fund raiser to help TRF get back on their feet. If you can help, vist >> their GoFundMe page.
-
Hey there Guest!
If you enjoy BCF and find our forum a useful resource, if you appreciate not having ads pop up all over the place and you want to ensure we can stay online - Please consider supporting with an "optional" low-cost annual subscription.**Upgrade Now**
(PS: Subscribers don't see this UGLY banner)
Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
STOP!! Never post your email address in open forums. Bots can "harvest" your email! If you must share your email use a Private Message or use the 
smilie in place of the real @
Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
SU HD8 HS8 differences
- Thread starter beez
- Start date
Share this page
Simon TR4a
Jedi Knight
Offline
HS means a "side" float chamber, HD is I think a later model with a diaphragm, HIF means integrated float chamber and is also later than HS. The number tells you the throat size, 4 is 1.5 inch 6 is 1.75 inch 8 is 2 inch.
I think only the 2 inch carbs come in a D version.
Perhaps someone else can confirm this in case my memory is at fault.
Simon.
I think only the 2 inch carbs come in a D version.
Perhaps someone else can confirm this in case my memory is at fault.
Simon.
Hello Adam,
as far as performance and stud fitting to the manifold they are the same.
The essential difference is in the construction around the jet assembly, the HD (D for diaphragm) has the jet totally enclosed within the carburettor body and the diaphragm is there to allow jet adjustment. The HS has the jet assembly protruding from the bottom of the carburettor much like the H type but with a simple tube to collect fuel from the float chamber.
Alec
as far as performance and stud fitting to the manifold they are the same.
The essential difference is in the construction around the jet assembly, the HD (D for diaphragm) has the jet totally enclosed within the carburettor body and the diaphragm is there to allow jet adjustment. The HS has the jet assembly protruding from the bottom of the carburettor much like the H type but with a simple tube to collect fuel from the float chamber.
Alec
Similar threads
Similar threads
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
HD8 carbs, what is minimum fuel rate to keep bowls full, car is dying.
- Started by jjs64bj8
- Replies: 18
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
B
-
-
-
-
-
-
-
-
-
-
-
-
A friendly reminder - be careful what links you click on here. If a link is posted by someone you don't know, or the URL looks fishy, DON'T CLICK. Spammers sometimes post links that lead to sites that can infect your computer, so be mindful what you click.