Twin carb question

[bootlegger]

Ive bought myself a pretty worked red motor for my van project. 35 75 cam a fair bit of head.work. Not sure of the comp but say 9 ;1.
I want to run twin stromberg carbs on an x2 type manifold.
What set up do I run..

[Trev]

2 x 1-3/32 (149) carbs.

[bootlegger]

So just get a pair of these and just bolt them on?

[Harv]

Dave,

As a rough guide, both HD X2 (179ci) and HR X2 (186ci) ran almost identical twin Strommies on a red motor. They had BXUV-2 carbs (1 3/32” throttle , bores with 1 5/16” venturis) with 0.055 main metering jets and #56 power bypass.

I'd find two 1 5/16" BXUV-2 carbs, strip, clean in petrol/thinners and rebuild them. Jet out to 0.057 main metering jet as a starting point, and probably keep the #56 power bypass (suspect they were rich when you had the boot into them, though will need the main metering circuit richened with the 57's to account for ethanol and modern tuning). You will need some linkages - married types similar to original can be bought off eBay... tack weld or cross drill to stop slippage. Pair of el-cheapo air filters from Rares, or more expensive if you feel like it. Fuel lines in either brake line bundy tube or rubber hose (not a personal fan of hose though).

Happy to rebuild some for you and jet them out in exchange for panel work (which reminds me... I must pull the finger out and call you ).

Cheers,
Harv

[Trev]

So just get a pair of these and just bolt them on?

You might need to run fuel into them

[bootlegger]

Ah trev its all in the details. The van doesnt even have a petrol tank yet.
Thanks harv. Ive been ratting around my place. Ive got dozens of grey motor carbs. Ive even got more stromberg 97s than anyone I know. Ive got linkages and and a really cool home made air cleaner. The problem is decent red motor carbs. I dont think I have a pair.
Ill see what I have tommorrow.

[bootlegger]

I went ratting around in my stuff and found two nos 2376878 strombergs.
The bases are too big but they interchange with the base bvx 2.
Would these overcarb my engine.
I have two bvx 2 but they may clean up but wont look as good as these new ones.

[Mick]

i would assume they would atleast work, considering people triple su's tripple webbers 4 barrel hollies and triple strommies on i'm assuming all of which would deliver more fuel a mate once put triple webbers on a dead stock high mile 202 and it ran

[Trev]

i would assume they would atleast work, considering people triple su's tripple webbers 4 barrel hollies and triple strommies on i'm assuming all of which would deliver more fuel a mate once put triple webbers on a dead stock high mile 202 and it ran

Yes it will run but how well?
I had x2 carbs (2x 149 carbs) on a stock red 6 and it was smooth and gave me no problems, but I decided to change them to a single carb (186) and the power increase was very noticeable.
So if it's a stock motor I wouldn't bother!

[Harv]

Dave,

The 2376878 number is very high... it starts to look more like a part number (for say an idle screw) than a whole-carb-assembly number. The Stromberg data I have is good up until the late 70's, and would indicate that this number is a replacement carbs for later GMH models. Was this the number stamped on the float bowl or float bowl angle-iron bracket?

A pair of Strommies will readily run a moderately worked red on pump fuel (perhaps not on methanol, though alky was not issued to the County Councils ). They may run rich, but they will run. You would need to jet them down way low before running the risk of running lean.

Cheers,
Harv

[bootlegger]

Harv this number is on the carb base. The only reason I want to use them is they are new.
I think the scc had plenty of alcohol issued back then

[Mick]

i would assume they would atleast work, considering people triple su's tripple webbers 4 barrel hollies and triple strommies on i'm assuming all of which would deliver more fuel a mate once put triple webbers on a dead stock high mile 202 and it ran

Yes it will run but how well?
I had x2 carbs (2x 149 carbs) on a stock red 6 and it was smooth and gave me no problems, but I decided to change them to a single carb (186) and the power increase was very noticeable.
So if it's a stock motor I wouldn't bother!

as it says in his first post it's a hotty, i was more just thinking short term to get it running and to the AHD fine tuning can be left to a later date

dave if you are not sure where to look for carby size there's a marking on the side of the bowl beside where the fuel inlet is it will have some numbers and a size 1 1/32 etc

[bootlegger]

So ive got the engine idling smoothly. Plenty of response on the throttle. I go to balance the carbs and the front carb is sucking like crazy , the rear almost nothing. Can anyone explain to me whats happening.
Im a twin carb virgin im afraid.

[fingers]

So ive got the engine idling smoothly. Plenty of response on the throttle. I go to balance the carbs and the front carb is sucking like crazy , the rear almost nothing. Can anyone explain to me whats happening.
Im a twin carb virgin im afraid.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Give me a call Dave .............Fingers 0409253202

[Harv]

Dave,

The fronts do start out that way - never did get to the bottom of why (assume it's got to do with inlet pulses in the manifold).

Get em' disconnected, and play with slow idle adjusting screw until they're equal. Then set idle mixture (same on both) which will screw around with the idle speed. Repeat both steps until you are happy with the idle. Reconnect and recheck balance both at idle and at speed.

I've got a synchometer if you want to use it for the balancing.

Found a post where the same issue was occuring - turned out to be a dud carb (found it by swapping the two carbs over, and the problem moved to the other side - might be worth trying on yours Dav if they won't balance):
http://www.fbekholden.com/forum/viewtop ... m&start=15

Cheers,
Harv