Stromberg 97s on motorcycles

Normally I post any motorcycle based questions on the Jockey Journal but this is a little more hot rod based. Im thinking of running 2 Stromberg 97s on my '66 BSA 650 Lightning rigid. Now running one on each cylinder Im affraid it will be overkill. Each cylinder is 325cc / 19.9ci. Rather small displacement. What is the best way to tune them down so Im not overcarbureting my motor? Also Im talking about running them on something that has no fuel pump / low pressure.

Am I going to drive myself crazy trying to make this work?

 

[Am I going to drive myself crazy trying to make this work?[/quote]

yes.

for th price of 2 new/good stroms you could buy another bike or car(if ya have the right connections).
where in nova are ya?
i had the same idea years ago, but didnt follow up on it.
if yer close by hit me up. maybe i could help ya.

 

BAD idea....Strombergs were not designed to lean into turns.

 

I no longer live in Culpeper, I just havent updated my info. I have owned plenty of 97s over the years..but all were on cars. Im building my BSA as a show quality bike (but I ride the hell out of it) and I have seen 97s on a few bikes including Billy Lanes hubless bike had one. Heres a bad ass little BMW with dual 97s.
http://vintagemotorcyclesonline.com...76:bavarian-bomber&catid=52:stories&Itemid=77

I didnt account for the leaning... Hopes and dreams slowly being crushedddd....

 

I dare say that beemer does'nt get ridden much , an bike motors require more precise tolerances on everything , fuel systems included . so another no here ....

Me i'd use flatslides , they make horsepower on everything ....

 

"tune them down so Im not overcarbureting my motor"

Requires a CV carb or vacuum secondaries - can't be done with a straight butterfly or slide carb.

"not designed to lean into turns"

Leaning doesn't affect the float level or function unless the bike is parked. When banking over, centrifugal force holds the gas down on the same angle as the lean.

Quick answer: definitely not.

 

Just thought I would get some opinions, thanks guys! I think Ill stick with my Mikuni's.

 

Crazy. Dumbest idea I ever heard. When do we start?? I've got the jet wrench ready.
1 100 horse flathead cylinder=30CI, one 60 =about 16...
Flow ranges trying 81 and 97 is not entirely insane if approached as a singlcarb attached as a single runner per cylinder, no plenum.
I think a crazed, obsessive masochist could pull this off with a lot of tinkering...reversion, manifold length issues would be a source of lots of thought.
Somewhat like a 4 carb flathead...
That's just the sort of bike that was always in the motorcycle column in HRM back then.
None of those guys tried this, but we live in a crazier age...

 

A crazed, obsessive masochist... You just descibed me pretty good. I would mount then as a single carb per single cylinder with no plenum much like my Mikunis are set up now. I think I might make an intake for them and adapt them to a twist throttle and screw with them in my spare time. It only takes 10 minutes to swap back and forth between carbs on my bike.

I dont think I ready to give up this idea yet. If I do tinker with good results, Ill be sure to post pictures.

 

geez MAtt...haha done yet?...Wtf, how bout now?...haha

 

being a downdraft carb, and a parallel twin, I gotta wonder where the hell are you gonna put them? Let's see, come of the head and turn up 90 degrees to work with a downdraft, that puts then right about where your thighs should be. Wrap your legs out and around and you will perfect what we call the dorky looking Harley dudes do when they stick their legs way out- the Gay Riding Position

 

Keep your comments to yourself Chris!

 

Check the site for more info and pics.

 

Atta boy Tom, you just proved them wrong. Oh, by the way very nice Beemer you got there.

 

Yeah thats the bike behing my insperation. That website has good info. Thanks!

The Beemer is just incredible

 

That beemer looks neat, but where the hell do your knees go now with those carbs in the way?

 

waste of time the old SU 's are a better choice

 

A bike sitting still proves nothing. Would you believe it if the owner stuck a 6;71 in place of the gas tank an said look at me I've got a 6:71 on my Beemer? 97s on a bike is another one of these dumbass just because I can I will, OCC ideas.

 

It would look cool but not very practical.

 

My question would be why in the world would you want to do something like that when you already gave up on the Amals for the Mikunis? If you're truly a masochist, run dual Amal GPs.......

 

Sorry for my above rant. I didn't realise that the 97s are going on a show bike. So theres no real need for them to work. Install them vertically between the frame top rails. Then you can make a little bitty 2qt. tank and look cool. Better still get in touch with the guy on this forum that wants to turn a chevy into a two stroke. You have a lot in common.

 

Dissable / plug one venturi on each carb. Jet 'em both down... should work with some messing around... What about using 48's?

 

Stevenson cycle here in MI built a reverse flow H-D a couple years ago that used a holley 1 barrel looked cool think its call Switch


if you do a Google search for Stevenson Cycle you should be able to find it

 

Uh ohh its an attack of the FNGs

I bought the bike Mikunis already on it. And they work great. I have seen with my own eyes bikes running fine with 97s so no, It is not a "Because I can I will, OCC idea." But whatever, hate if you want.

In the mean time I have been making templates to mount some 94s I have had laying around, soon I will know how hard it will be tuning this beast. Thanks to all the guys that are offering real solutions and advice.

 

Your just making yourself look like an asshole dude. Because something is show quality doesnt mean it gets trailered. Ask anyone here and they will refer you to a member with a show stopping ride that gets driven...Sun, rain, mud. Its what the HAMB and the JJ are about...Using what you build.

 

I race at El Mirage and I see a couple of race cars that are of show quality pull up to the line, run, get covered in dirt and dust and show up for the next meet once again clean as ever. My question should have been, Why? 97s weren't designed for a bike. I always thought that changes on a car or a bike should be to make it better and/or faster. I can't see 97s doing that. Thats all. Its your bike, build it your way.

 

This is funny. You guys are down on him because he wants to try something different. DUH!!! isn't that what hot roddings all about. Where would we be if know-one ever decided that they could rig up a GMC 671 on hot rod. Sometimes there are trade offs, and you all know it. You lower your car, watch out for speed bumps or pot holes, If you run zoomies you better get used to exhaust fumes, What about running 4 or 6 97s on your engine, how often do you really need all that carburetion. Almost never on the street. So why do we do all these things, because were gear heads, we got nuts, and it looks good. Every one of you has done something that's not that practical but looks dam fine.

You don't get famous building mediocor shit....

 

Im not looking to set land speed records. IMO 97s are making it better aesthetically. For all we know a 97 may perform better than my 32mm. This is what hot rodding is about. Bending the rules, swapping parts, making shit look cool / or go fast. I choose the look cool route. It better suits me cause I ride with only a rear brake so fast isnt a good idea.

Wilder things have been done.

 

I prefer go to show. Thats not to say it can't look cool as well. But my feeling is an ancient carb designed for car use wouldn't be a performance improvement on a bike. But to each his own. Hopefully this will be out at El Mirage and (funds permitting) Bonneville. As I said build it your way. I'm building mine my way.

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love it or hate it.. this is my junk.. I say go for it!!