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What is a Grose jet? (in an SU carb).[140-160/68&71] posted by Trevor G. on
Monday, 8 February 1999, at 3:39 p.m.
I know a Grose jet is one form of the needle-and-seat assembly operated by the fuel float in an SU carb, but how would I recognise one? T.I.A.
--Trevor G. ('68 144S (47K) and '71 144S (144K)), both with BW35s.)
Re: What is a Grose jet? (in an SU carb).[140-160/68] posted by abe crombie on
Monday, 8 February 1999, at 9:32 p.m.
Imagine a ball point pen point tip blown up about 20 times normal size and with a hole drilled through above the ball point. The ball is not fixed but will lift up inside its "cage" and contact a viton rubber hollow seal on the hole that comes in from fuel inlet on carb bowl.
Re: What is a Grose jet? (in an SU carb).[140-160/68] posted by George Downs on
Tuesday, 9 February 1999, at 9:17 a.m.
Grose Jets are made by the D&G Valve Company in
Massachusetts, and ones for different carbs look
different. They replace the regular float valve in
SU and other carbs (You can get them for the %&##
Zenith Strombergs) and are a one-piece installation,
where your standard replacement item has a seat
with a sleeve on it and a needle that fits inside.
For the HIF 6 SU carb you don't see the ball, it has
a small brass pusher that sticks out and the float
pushes against it. The one for HS6 carbs has about
a 7/32" ball that is pushed by the float, so it is
readily visible.
They can stick shut -- I've been having that problem
on my 164 lately and have taken to carrying a 2 oz
ball peen hammer with me which I was having to
use about 2 blocks from home in the morning.
(That's how far I got on a carb partly full with
no more gas supplied.) It hasn't done it for more
than a week now. I'm not sure why, but I'm glad.
BTW the valve that was sticking shut was
BRAND NEW.
George Downs, Bartlesville, Oklahoma
Re: What is a Grose jet? (in an SU carb).[140-160/68] posted by Glenn Goodspeed on
Tuesday, 9 February 1999, at 10:30 a.m.
Grose-Jets are more dependable than the stock needle-and-seat assemblies, and for that reason, they hardly ever get replaced. After several years, they can get coated with goo from the gasoline and get stuck occasionally. The fix for this is to remove the jets and flush them with Berryman's B-12 or a similar carburetor choke cleaner. -Glenn.
Goodspeed's Volvo 1800 Newsletter