I am looking for ways to hook-up the throttle on a speedster running a Rajo BB head. Can I still run a throttle rod through the block? It looks like the exhaust is kinda in the way on the steering side. I am going to be putting one of Mark Chaffin's kits on a '26 block, but I am just getting started, and I want to anticipate some of the difficulties that might be encountered. I will probably use the intake manifold that Mark supplies with the kit and one of Stan Howe's Strombergs.
Any help and pictures appreciated!
I think you'll want a carb with bigger throat than than the OF, such as LB-1, which is sidedraft with 1 or 1 1/4 inch throat.
Welcome to the Forum, Jon. Please tell us about yourself; what did you profess?
MB-1 I ran on my Fronty for awhile.
Yea, I agree. I have an OF, and I just measured the throat. It is 7/8". I want something bigger for this setup. Stan thinks maybe an OE-1 or an OE-2 updraft might work with Mark's intake manifold. I will TRY to post a picture of Mark's "Winfield" style manifold below so you can see what I am talking about. (I am new at using the Form, so pray for me!) The bolt pattern on Mark's manifold is perpendicular to the engine, and the spacing is sort of weird - 2 37/40" according to Mark who set it up for a Winfield M201-B. I don't want to run that carb, so I am looking for something else. As Stan has said, we will make something work! And if anyone can do it, he can.
The question that I originally asked was about the throttle hook-up. The Rajo BB cover plate goes completely across the engine and covers the original throttle rod hole that goes through the block. So some sort of surgery or creativity is required to get back in business. So I am wondering what sort of solutions the speedster guys have come up with. Surely there must be many possibilities and methods?
I found a foot pedal (no idea what it was from) at a swap meet and made up my own linkage for my speedster. I find it easier to use the foot feed when shifting an aux transmission with no syncros.
I set up rods and bellcranks to make the connections. Some folks have borrowed cable linkage from the hot rod world to manage foot or hand lever throttle linkage but it doesn't fit in my world.
I would drill a hole for the throttle rod. You will probably need a bellcrank, too.
A Stromberg L, M, or O-2 is the right size for that job. I have an MB-2 I ran on the Fronty for a short time, too. The B is for sidedraft.
I just happen to have a Winfield M201B I'll be putting on T-bay soon.
I went through the UC System here in CA and then worked at the University of Florida (Go Gators!) for about 30 years teaching Population Dynamics and Insect Ecology in the "Bug" Department (Entomology). I was never a real biologist just a "theorist". The best part of my job was the students. I served on 55 Ph.D. committees over the 30 years as either major prof. or committee member. That was cool. But after 30 yrs., when I could retire, my wife Sandy, said "Can we go back to California now???" The answer was of course, YES, and we are now back in our home town of Ventura -- YEA!!!! And I am working on Model T's. I have a '14 runabout, and I am just staring this speedster project.
Here is a pic of the '14:
Well for some reason the '14 never showed up. I will try again! No luck! The upload button is not being nice to me...
I hate computers...!
Computer is only half a word, Doc. Give it your own first half...
Don't you know about computer bugs?
Back in the day, speedsters were called bugs, so you have the right project.
Hey Jon, cool engine! Keep posting pics of the rest of the car.
Here is a link to another speedster being built, these guys have a pretty cool solution to the throttle linkage awkwardness that can ensue from bolting on an OHV setup.
Scroll down about halfway and look for the post by Charles Linsbarth on May 17th at 9:49 pm. There are some good pictures of how they managed to get the throttle linked up. I personally think you'll need to get a hole through the Rajo cover. I'd rather go "under" than over the head for the throttle linkage. Ultimately it will depend on which carb you select to determine the orientation of the throttle shaft - and thus the linkage.
I've got ideas running out my ears. Lol, let us know what you come up with. If you do cut a hole through the cover, here's a bracket that would work. Wouldn't be hard to make and set up.
Red parts are brackets, black part is shaft that links to throttle rod and carb, moves by rotating. Blue part is throttle rod, brown box is hold through Rajo cover. All depending on the carb, you could do the same setup but on the backside of the engine,
Thanks for that wonderful posting address! I like the throttle pictures.
I have thought about using a Winfield M201-B since it is what Mark Chaffin has designed his manifold for. My hesitation is that Stan Howe (whose opinion I greatly respect) will not work on Winfields because they are pot metal. He thinks that the old pot metal is prone to cracking and breaking and made from easybrakeium, unobtainium metal (as he puts it).
Fred Houston and I guess you too have a couple of those carbs for sale. Maybe if I was "real nice" to Stan, he might rebuild one for me?
Any opinions on this appreciated!
I see now that it was you that had the Winfield for sale rather than Seth. Sorry about the error. I think I need "Senior Moment" pills!
Thanks too for the helpful diagram. By the way - That is NOT my engine (I wish it was!) but an early version of Mark Chaffin's set-up. I just posted it as an example of what I will (probably) be doing.
That's why I recommended the Stromberg L,M or O in -2 size, Jon. It's all brass, and same flange and throat. From reading the archives here on potmetal, it appears that if a part has survived this long, it should be ok, as its alloy wasn't badly polluted with lead in the diecasting process.
That said, I have seen successful JB Weld repairs on potmetal, including the bowl cover of the Winfield above.
The 5V Winfield is the right size for you, and is aluminum and brass. I run a 5H (horizontal) on the Fronty. You can see a couple of 4V in the completed listings on Tbay.
I used a carter BB1 on my old one
I guess lots of guys run the BB-1, but it is a little new for my taste. From a function point of view it would probably be a good choice. I just lean a little more toward more period carbs. And besides, the brass ones look cool!
When you say Stromberg L, M or O, I guess the Stromberg OE-2 is one of those (see pic below). That is what Stan Howe thought would work. I am not familiar with the Stromberg L or M series.
I don't understand all I know about Strombergs. The L has an economizer (acceleration pump) while the M does not. The B in the model number is for sidedraft.
I'm sure somebody else has more info.
One thing to note: the Winfields have piccolo tubes instead of venturis, so they will flow with less restriction for the same throat size compared to other carbs. The early HV Winfields have a single piccolo, while the M and later have dual piccolos, one for high speed and one for intermediate.
The Miller carbs don't have a venturi, either, and use a harmonica to feed the gas, instead of piccolos.
Not having venturis, they are far less likely to ice up.