Stromberg carburettor main jet size.

[Gippslander]

Seeking assistance on setting up my Stromberg carburettor main jet, my car is a Series 2A 2.25 came with a Holden carburettor and I have set it up as I would for a Holden Grey motor. I haven’t changed the jets just cleaned it and set float level, the engine is running very rich so I was wondering if anyone has installed a stromberg to their car and what jets were installed. Or would I be better fitting an adjustable main jet.

[Tins]

Seeking assistance on setting up my Stromberg carburettor main jet, my car is a Series 2A 2.25 came with a Holden carburettor and I have set it up as I would for a Holden Grey motor. I haven’t changed the jets just cleaned it and set float level, the engine is running very rich so I was wondering if anyone has installed a stromberg to their car and what jets were installed. Or would I be better fitting an adjustable main jet.

Interesting. Holden Greys are around the same displacement as the Series, one a bit smaller and one a bit larger. I would have thought that a similar jet size would be fine.

I don't remember; is the jet size marked on the jet? I have a Stromberg here from my SIII. If all else fails I could take it apart for a look. I was going to put a kit through it at some stage anyway. It's not high on my list but I'd do it if it helps.

Very long time since I looked inside a Stromberg.

[Tins]

PS. Not meaning to insult you, but the float level is correct?

[PhilipA]

It is not unknown for unskilled tightwads to drill out jets when they think they are too small.
Suggest maybe a new standard main jet so you know a baseline.
Regards PhilipA

[Tins]

It is not unknown for unskilled tightwads to drill out jets when they think they are too small.
Suggest maybe a new standard main jet so you know a baseline.
Regards PhilipA

Bought a FIAT with twin downdraught Webers like that once. Jets were like drains, and used fuel at the same rate.

[gromit]

My Series I has a Holden carby but it's fitted with an adjustable main jet.
It does run rich but that's a legacy from the father-in-law setting it up when we drove to the 60th. He was worried about burning out exhaust valves !

Stromberg Adjustable Main Jet - Hume Performance (https://hume.com.au/product/stromberg-adjustable-main-jet/)


Colin

[Tins]

He was worried about burning out exhaust valves !


Colin

As you do.. Have to give it a de-coke instead!