4 replies to this topic

[grizzler73]

Hi Guys

I have to use twin 1 1/4" (HS2) carbs on my race engine in the GTM, I am wondering if I could benefit from turning up some float bowl extensions for them?

I see that there are a few on the market (Swiftune, MED) for H4 carbs, but would it be a good thing for the HS2's? I'm thinking anything that could reduce fuel surge is worth a look.

What do you think?

[nicklouse]

that's a new one on me.

what I found was running a Filter king in the engine bay helped reduce fuel surge issues related to having to shift fuel from the back of the car to the front when using a mechanical pump. (Mini)

 

I guess you will neither be having a mechanical pump or a fuel tank in the rear.

 

I would be tempted to leave them as they are and see how it goes. also consider that they will move the chambers closer to the exhaust/heatshield.

Edited by nicklouse, 06 September 2019 - 09:42 AM.

[DeadSquare]

If the engine is cutting out on corners, it's worth a try.

 

We bought an engine from Downton that they cured with an extension on a single 1 1/2".

[grizzler73]

that's a new one on me.

what I found was running a Filter king in the engine bay helped reduce fuel surge issues related to having to shift fuel from the back of the car to the front when using a mechanical pump. (Mini)

 

I guess you will neither be having a mechanical pump or a fuel tank in the rear.

 

I would be tempted to leave them as they are and see how it goes. also consider that they will move the chambers closer to the exhaust/heatshield.

 

Engine is still at the other end from the tank, just the other way round!   

On a HS2 the bowl is bolted to the carb, so the top would move up rather than the bowl move down, if that makes sense...

Edited by grizzler73, 06 September 2019 - 10:18 AM.

[imack]

I didn't think fuel bowl extensions were available for hs series SU'S.
As mentioned above, the fuel bowl is fixed to the carb body so if you added an extension to the top you'll mess up the fuel level in relation to the jet.I can't see that it'll work.

Edited by imack, 06 September 2019 - 07:23 PM.