Stromberg BIG 97
 

Anyone using one of these,
I,m thinking of getting one for my 265 cuin 99a engine,stock cam and heads.
I currently use one 97 carb on in it. and think it may be a bit small,I have it in my 33.
Lawrie

Re: Stromberg BIG 97
 

I have this one.

Re: Stromberg BIG 97
 

I believe he's talking about the NEW "BIG 97" as offered by Stromberg. They're 250 CFM. Click the link! DD

http://www.stromberg-97.com/carburetion/big97.asp

Re: Stromberg BIG 97
 

maybe one of the carb gurus can chime in....Mike

Re: Stromberg BIG 97
 

Re: Stromberg BIG 97
 

Any one using one?
Lawrie

Re: Stromberg BIG 97
 

Maybe try PM felix37 he has one on Lawrie.
https://www.fordbarn.com/forum/showth...=Big+Stromberg

Re: Stromberg BIG 97
 

Thanks Rob, on a side issue,I just bought two sets of diff bearings at my local brg joint,all timkin and made in USA.
Lawrie

Re: Stromberg BIG 97
 

Praise the baby cheeses !! Guard them with your life.. USA made Timken would be like gold now...

Re: Stromberg BIG 97
 

I can say the "BIG 97" was years in the making and has undergone serious research and development. It would be a good fit for any single carb installation such as you mentioned.

Re: Stromberg BIG 97
 

HI,

I noticed that these are rated at 250 CFM. Does anyone know what the original 97's CFM is rated at?

Re: Stromberg BIG 97
 

I'm sure its about 155cfm.

Re: Stromberg BIG 97
 

Thank you weemark.

Re: Stromberg BIG 97
 

Velocity...the correct word Im looking for?
What would be a flatheads volumetric efficiency be 75% at best?
Just mucking around doing the calculations Lawrie you could be just over 200CFM with a 265 CI.
BUT your towing a lot, I wonder how the lager CFM might effect your bottom end?
Hey if it doesn't work you could always send to me to try on my lightweight truck
; o P

Re: Stromberg BIG 97
 

One thing to consider is how do the throttle openings of the big 97 match up to the carb mounting pad of a stock inlet manifold? I mention this as I know for a fact that a stock flathead intake (excluding the 8CM) don't have enough meat to open up to match a Rochester 2 gc.
Ain't worth doing if the intake is not opened up to match.
Cfm, what depression was the big 97 tested at to arrive at 250 cfm,
the normal published 150 cfm for a stock 97 is a figure that was tested at 1.5" not the usual 3" that is universal test depression for a 2 bbl carb. 1.5 is what 4bbls are tested at. So to compare flow twix 97 and Big 97 you need to test at the same depression.
Martin.

Re: Stromberg BIG 97
 

Martin,I haven't looked at the manifold to see if there is enough meat to open up the bores.
And as Talkwrench says ,most of the driving I do in the 33 is towing our caravan (900Kgs) at around 50 mph with the 3.78 rear gears and 17 in tyres,so about 2100 rpm,it gets reasonable gas mileage it that ,about 18 litres /100 klms.
I know the engine would make more power further up the rev range ,but it hardley ever goes above 60 towing,
If I was,t towing I think a 3.54 and bigger carb would be useful,
Lawrie

Re: Stromberg BIG 97
 

martin the big strombergs are not as big as rochesters 2barrel carbs. all the information about them is on clives web site http://www.stromberg-97.co.uk/tech_c...y.asp#techlist

Re: Stromberg BIG 97
 

Thanks for that link Mark,
Will have a butcher's.
Martin.

Re: Stromberg BIG 97
 

It's too bad they didn't standardize the carb flow depression between all companies. When I worked at Zenith carburetor in the engineering lab years ago, we flowed the carbs at a 2" hg depression. Makes it hard to compare apples to oranges unless you have you're own flow bench.

Sal

Re: Stromberg BIG 97
 

I have a Stromberg carb that seems to be the same as a 97, except it says "1 1/32" on the side. That would be about 1/16 bigger venturi - would that be considered a "big 97"? I don't know what the carb is from, I bought it at a garage sale.