••• 4x2 Intake loading up in 3rd gear?•••

I recently finished my '35 to a point where I could drive it. And after sorting out some charging issues, I've moved on to the next batch of obstacles. This time it's the carbs loading up, fouling and eventually cutting the engine out. Now I know the first things I am going to look at are the jets and maybe running a hotter spark plug but the thing that I keep coming back to is the R&P ratio that I put in the banjo rear. It's a 3.54 gear and mated to a '39 Ford trans in front. I also have a 32" tall Lester tire out back so I'm not sure if that needs to be taken into consideration but I'll mention it anyways.

When I'm shifting 1st and second seem fine and run through those with decent power. However when I shift into 3rd it sounds like I go from 3K to like 800 rpms and sounds like a tug boat. Now this might be ok for cars that make their power down low but with a 265 Chevy I would think that that RPM needs to stay up higher for it to have a chance of pulling at all. So has anyone zero'd in on the gearing being the culprit to their carb issues? Is it likely?

Why is it my second to 3rd shift is so dramatic? Sounds like I'm switching on a Columbia!!!

 

Man thats ****s, really like your coupe. That 1 to 1 ratio sounds like a drastic rpm drop. Is 800rmp what you are reading on the tach? I would gear it up maybe 3.90's

 

The rear gear is probably too tall with the tire size you are running, and that is excaberbating the issue, but the primary problem is the idle feed restriction is too large. The main jet isnt really going to have any effect, as at that rpm, the engine is running primarily on the idle circuit. If it was a double pumper, I could tell you where the IFR is, but I am not familiar enough with these carbs at this point. IIRC you are running Holley 94's? Are you running a progressive linkage? I'm ***uming not.

 

jeffery,i don't think its your gears,3.54 should do ,maybe a hotter plug,jet the carbs down,anyway hope you find the problem..........richie.........

 

This might help, check out Bruces post.
http://www.jalopyjournal.com/forum/showthread.php?t=165413
Sounds like the 94s have an idle jet instead of a restriction. Same thing, except a jet is easily removable, this makes things easier for you. With that intake, pretty sure you have to run idle circuits in all four carbs, so you will have to lean the idle jet considerably. Keep in mind, the fuel requirement at low rpm doesnt change a hell of a lot when you add carbs. the idle circuit in one of these carbs is designed(depending on which ones you are using) to provide sufficient idle and low rpm fuel for either a flatty or a y-block. The 283 doesnt really require much more fuel at low rpm than either of these engines, and you have gone from two idle feed jets to eight, so they need to be a LOT smaller.

 

3.54s are fine for that combo. What size jets are you running?

 

if you are running 94 carbs they have power valves in them they run off va*** you might be loseing va*** and it is dumping fuel in

 

He's running 97s.

 

Oh yea, and congrats on driving the damn thing!!!

 

^^^^^^ dito ^^^^^^^


What plug gap and ignition are you running ?

 

I am sure you already know this but be sure to change your oil as soon as you get the over fuel problam fixed. That would be a shame damage your 265.

 

If your running Strombergs,Contact Uncle Max here on the HAMB He will fix you right up,hell even Clive from Stromberg recommends him! And hurry up Baltimore is next weekend!

 

Uncle Max built all four of these and he did a great job!!!! I highly recommend him! I'll have to see what Jet size he put in.

I didn't know I should change the oil..... tell me more.

I don't have a tach so I don't know those RPM's are right. It feels like what I said I guess.....

 

at 1400 rpm in high gear you shoud be running 40 mph and around 2000 at 55 mph maybe your trany have to big of a split on it

 

THanks and thanks! It's about time huh?!

 

The oil should be changed due to the amount of unburnt fuel that could make it's way into the oil.

Alot of what we discussed earlier has been echoed here. I hope something will come up so that this can be remedied and we can get some miles on those tires!


******Knuckles

 

That damn oil is expensive!!!! Takes money to make money I guess....wait that doesn't apply here. One week til Baltimore!

 

I know you don't want to hear this , but you might try blocking off a couple carbs and see what you get. 4 carbs look good but is a bit hard to tone. Good on alcohol,but somewhat over kill on gas. a 4:11 might be a way to go with the tall tire.

 

I got a PM from a friend yesterday and said he faced a similar problem with this 6x2. He said he went through everything and what it ended up being was the linkage not closing the ****erflies properly when pedal depressed. He backed it all of until everything was absolutely closed and back to zero and it solved the problem.

Now that got me thinking because I DO have some adjusting on the linkage to get it right as it does not disengage the secondaries after then have been used unless I blip the throttle and even that doesn't get them back to closed. SO what I was thinking yesterday was that maybe when I'm in 1st and 2nd and I'm pushing through those pretty hard, I'm probably opening up the 2 secondary carbs and then when I shift into 3rd all relaxed like they're still open and just dumping fuel in even thought I'm in a really low RPM and just chugging along.


Ya think?

 

Well if you actually drop to 800 rpms that's a problem, is that a guess, an embellishment, or just figuratively? Hard for a road going engine to make any power and move a load at that rpm.

Try giving the throttle a good blip before you let the clutch out for 3rd gear ? If you think linkage is sticking.

 

I'm no expert on the 265 chevy and my books only go back to '58 and the 283. I am questioning the spark plug you are using, all smallblocks with cast iron head take a tapered short reach plug, you show a gasketed plug. If it is supposed to be tapered then the plug ain't going all the way into the combustion chamber.
Just wondering.

 

Wow!! Keen Eye!! I'll double check and find out to make sure I get the correct one this go around. THanks so much for the tip, I would have never known that.

 

Should be an RJ45 think?

 

I honestly have no idea what the RPM's are actually at. I just know it's a huge jump down when shifting into 3rd. So much so that I can't even really roll the throttle up at any decent rate. Feels like I kick on an overdrive.

 

AC Delco R45 is the stock plug.

 

Wonder of there's a cross reference to a lil' hotter plug.

 

Chevy didn't start using the tapered plugs untill 1970 or so. A (56?) 265, if running the OG heads should have gasketed plugs.

 

They're '57 heads on a '56 265.

 

I'm running R45S AC DELCO plugs currently.

 

Maybe call NAPA (or whatever you guys have down there?)
They should be able to give you options. For what it's worth, the plug you show looks like the ones I'm running (R45.)