VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1912-1928 Crankcase breather

Folks,

I know this sounds pointless but I want to try a Tillotson JR1 on my 28 tourer (for mixture adjustment). I have made a modified inlet manifold (flange @90 degrees), modified throttle rods, etc, etc.

The whole system fits well but I was just wondering what to do with the crankcase breather for the duration of the experiment. Should I just block it off temporarily? How? Or should I go to the trouble of making an adaptor tube to accomodate it?

Thanks

Since you went to all the trouble of modifying the other things I believe I would go ahead and make a permanent tie in for the breather, then you would be able to compare apples to apples (Carter to Tillotson)

Don't forget to check back here and let us know how your experiment worked and how the Tillotson compared with the Carter.

It will be interesting to find if you can fine tune the mixture on the JR1. If you have an emissions test meter it would be easier. Without one it will surely be a trial and error process that will take a lot of time to get it right. Apparent power is only one part of proper tuning. Fuel economy is another.

You are probably aware that the old method of reading the color of the sparkplugs to determine the fuel/air mixture ratio is real iffy with the new unleaded gasolene, but you will still get some relative info about too rich or too lean.

Hi Casper

There are a number of guys who have just been on the CHEV 4 TOUR (2300 miles plus)here in Australia who run the Tillotson Carb and have great results with them.
There is a guy in Wellington NSW, (which is nearby you) and he has a 1928 Chev Tourer that is fitted with a Tillotson Carb. OZJIM also runs a Tillotson carby on his 28 Chevy. I have a Tillotson fitted to my 1927 Truck and you would be better to fit a rubber tipped needle from a 6 cyl Holden Carb to help with the seating.
You can still use the vac tank with no problems.
Make sure you run an air filter. I have to use one mounted directly off the Carby as I cannot get it to run well with the hot air tube. So you will have to fiddle a little to get the adjustment correct. There is a process in adjusting the carby and if you don't have a copy of it I could fax you a photocopy of the original fitting and adjustment guidelines.

Twin4

Thanks gentlemen for the advice.

Twin4, I have contacted the guys you mention and I gues that is part of the reason I am trying it. I will try running a straight foam filter off the carb.

I'll try the needle.

Thanks again.

Hello, guys or blokes, or mates, whichever you prefer. I wonder if you do the same as the guy here that I know, he has a 27 touring car from Mexico with a Tillitson carb, he has the air intake faceing the front of the car, I guess a kind of a "Ram-Jet" effect. I chidded him for the hotrod modifing of the Chevy, He said he didn't like that #*&^%$&^ Carter carb because he had to pay $38 for a new brass bowl, but he is around 83 years young so he is entitled to a rampage or two toward a whippersnapper like me I am only 67 Ha!

Well I am not sure about turning the carb around, that seems a bit over the top.

The initial intention was to be able to run both the pre heat and the foam filter (with mixture adjustment to compensate). That is to be able to run the pre heat around town and the foam on tours.

It would still look original(ish) with the pre heat attached.

That is a good discription! The Gentleman here that put the Tillison on a 27 did it that way so the throttle and foot feed would hook up ok, well it is different than your vehicles the steering wheel and controls are on the wrong side from yours.

Carby???
Mike

Australian lingo, I believe.

You know I was only asking about a crankcase breather..............

Well it all went well and the car goes like a jet. A bit of fiddling around with the needles but now it seems to be going well. No leaks as well!

I am suprised how smoothly it all went. Usually these things that look simple on paper go wrong for me. Off to find a gas analyser.

Hi Casper,
I agree with "Twin 4",I know him,he knows me,(eh Dave?).I have had a Tillotson JR1 fitted to my ' 28 Truck for at least the last 15 years,and can honestly say,it was one the best thing's I ever did!
As "Twin 4" knows my truck,he can vouch for it's performance.With the diff ratio I run and the Tilotson carby,I can cruise at an average 45-50 M.P.H,and still get between 24 - 25 M.P.G.
My advice Casper,is,give it a go!You'll be surprised just how much difference it will make to your cars "performance".
You can also contact me as well if you like regarding the tuning necessary.