Help Frank :) - 100HP Chrysler carburettor change from wb24B to TC5D

[MickLovin]

Hi all and especially Frank, my new carbies have arrived and before I start putting them on, is there any thing I need to know for setting them up, will it be the same process as Frank's Sync and tune video or the manual set up per the book, both being the same, but I am not sure with these as they are so much bigger. I have the flange plates so I should start there first of course, but before I do just let me know if there is anything to look out for.

 

[Justinde]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Hi Mick


This wont help at all, other than give you a laugh.....

VERY FUNNY BEER Commercial - Jack rabbit Beer - YouTube

 

[MickLovin]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Yep Just ur an ozzie

 

[Frank Acampora]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Nothing different. Treat them the same as the smaller WB carbs. HOWEVER: Assume that anything that can be wrong IS wrong, Take them apart and clean them, inspect the needles, then set the float level. After mounting them start at 1 1/4 turns out from lightly seated on the low speed needles and try to stay somewhere around 1 turn out minimum.

 

[MickLovin]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Thanks Franks, as I thought but you never know.

 

[Frank Acampora]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Nothing different. Treat them the same as the smaller WB carbs. HOWEVER: Assume that anything that can be wrong IS wrong, Take them apart and clean them, inspect the needles, then set the float level. After mounting them start at 1 1/4 turns out from lightly seated on the low speed needles and try to stay somewhere around 1 turn out minimum.

 

[MickLovin]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Ok tonight I cleaned the carbies with a good quality carbie cleaner and soaked for around 4 hours. I then blew them out with compressed air and re-assembled them, I did note some slight mark on the air mixture screw so I gave it a light sand with some fine emery and it was gone. I set up the Carburettor link - bar and choke bar. I left the throttle link on at first and shifted into WOT via remote. I noticed compared to the WB carbies that I needed to adjust the throttle link bar around 3/16 - 7/32 inch ( American style measure approximation ).
I then took throttle linkage off after putting back to neutral via remote and adjusted throttle linkage to suit carbie shutters being horizontal. As I said I increased throttle linkage by 3/16 - 7/32 inch.
Ok my question is, does this seem right, the TC is a lot bigger than my WB's and I seem to have full range of the cam right to the end now, where as with the WB carbie, before it would stop, before it peaked over at the end of the cam and would still have shutter horizontal. I will be adjusting the air mixture screws tomorrow as per tutorial, I have noticed a slight difference from the tutorial to the manual though. The manual calls up for 1 full turn on each first, then 1/8 turn clockwise waiting 10 seconds each turn till it starts popping mark that. Turn counterclockwise 1/8 turn till it starts flooding (you know what I mean ) mark that and go between these marks. Same for bottom carbie, then work the difference in turns for each carbie for e.g no.1 carbie is 1 1/8 turn, no.2 carbie is 1 1/4 so they both get set at 1 3/16. I will be sticking to 1 1/4 though think it seems to work better and don't want to lean it out.

 

[Frank Acampora]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

The final setting is determined ON THE WATER. It is somewhat difficult to describe but if you are attuned to how the engine sounds you may know what I mean.

After setting carbs at idle, you go out on the water and do a hole shot. If the engine stumbles, then clears out and accelerates well, it is too rich. Lean the carbs 1/8 turn at a time until acceleration is smooth.

If the engine sags then picks up and accelerates normally it is too lean. Richen the carbs 1/8 turn at a time until it accelerates smoothly from a dead stop.

Although I have swapped TC carbs for WB carbs a few times, I never paid attention to the tie bar. It is quite possible that I needed to lengthen it also.

As far as throttle cams, I think there are only two: The bent cam for three cylinder WB carb engines and the flat one for 4 cylinder TC carb engines. If your original carbs used the bent cam, it should be swapped for the flat cam. Are you using the correct cam? Again, this is a detail I don't remember--I just put on the correct part.

Again, the proviso is never lean past 1 turn out. On my personal engines I will lean to 7/8 and even possibly3/4 to obtain good idle and smooth acceleration BUT: I can not recommend running this lean to others.

 

[SweeperForce]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Just to be nosey, why are you changing your carbs? Is there any power gain from switching to bigger pair?

 

[MickLovin]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Thanks Frank, I know the hole shot routine for tuning the carbs final. Done this that many times since I have had the 2 x 75hp and this 100hp. Ok as far as the cam I have the one on that came with the TC carbs, the flat one, as for four cylinder carbs having the straight one ,remember mine were WB and so the cam was a bent cam. But with the new flanges on you have to use the straight. So all good there, but yea I had to increase the throttle kink around 3/16 longer. All good ready to idle set and then water test. Hey BTW the TC5D doesn't seem serviceable for the inlet valve, it has a flat round body unlike my WB which is hexagonal??? what's going on there?
Sweepforce, I am changing my Carbies as they are the WB type, they leak like a sive even after a kit and I believe I could get another 5 - 10 HP hopefully, anyway Frank, it seems to have a better range on the cam than the WB carbie set up, my WB carbs only went to the start of the part which curves over, these go to the end for horizontal position of the carbs.

 

[Frank Acampora]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Very slight but yes there is some. It is similar to adding a 4 barrel to a Plymouth 318 engine. Yes, decreased airflow restriction will produce more power BUT: Unless you change to 340 heads and cam it, you won't see major gains.

The 100 horse Chrysler is limited to 100 horse primarily by the port timing since the 120 also uses smaller WB carbs. However, with the big TC carbs (twice the venturi area) he should see 1 or 2 MPH more. Not a lot, but for me it is the idea that matters, not the actual increase in speed.

BTW: I have been in contact with a fellow who claims that the 5 cylinder 150 can be built-up. However it does require high compression and premium fuel in addition to port work. He claims that the engine is producing 170 at the crank which would translate to a true 150 at the prop. I do know that mine made a major, and surprising, difference in speed over the 140 I had on the boat. It is about 7 MPH faster with way better acceleration, especially with a load in the boat.

At this time, because it is my basic go-have-fun engine, I will leave it stock. However, if it ever breaks down---all bets are off.

OOPS! Missed your sentence about the inlets. The TC carbs use a pressed-in needle seat and a rubber tipped needle--usually. To replace the needle is absolutely no sweat but to replace the seat you must thread in a lag screw and pull the seat out. With the correct sized lag screw it is not difficult. The only problem is that you can not simply pull them for inspection. The lag screw ruins them and they must be replaced.

 

[MickLovin]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Ok leaving the needle seat alone, its been clean and lets fuel through as well as stopping via float so I'm happy with that, I have been up all night waiting to do this

 

[Frank Acampora]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Just let us know if you can see a significant increase in power out of that 100.

 

[MickLovin]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

You know I will :watermelon:

 

[MickLovin]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Ok done low idle carbie tune, starts and runs actually a bit better smother I believe but I am biased. Let you know how water test goes, interested in power results, as I did one before I did these carbies and it was hitting 48 MPH I reckon I will hit the Golden 50

 

[MickLovin]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Ok I ran it a few times to make sure it started fine, which it did, but I am noticeing wet plugs, so I adjusted the carbs a further 1/8 turn and this reduced the wet plugs a bit, to be honest it need a good run to blow out the crap left from tuning it. But are wet plugs a sign of over rich mix, they were wet on all 4, but in saying that the motor hasn't gone past idling in my tub, I have revved it to see the response and it was fine. It first sounded like it firing when I throttled down, so I adjusted leaner and that sound went.

My air/fuel mixture screws are now set around 1 to 1 1/6.

 

[Frank Acampora]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Idle is a different animal that cruising. Make no assumptions until you get the engine out on the water ad running hard.

 

[MickLovin]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Any reason why she would be leaving wet plugs though? I know its just idling and not burning it quick, but should the plugs be wet on all 4?
I have noticed the procedure for over choking though, I only choke at the first start, and if it doesn't start after the first choke, I don't re-choke second start, but it has been starting first go lately even with the new carbies on, it actually has started first go more often.
One thing I need to ask though Frank. I am having to prime a bit each start, the carbies fill up and it primes up, but I have noticed on occasion some air bubbles at the beginning of the pump until I prime it up again and it fills then no bubble. I think I may have a air leak in the outlet of the fuel tank, could this cause a problem at idle or more so at higher speed. as I say it does fill up after another prime.
Also I have replaced the fuel pump diaphragm and gasket, as the old one had cracks in it, and I found a air leak around the tank, but I suspect there is another, as after I sealed the leak last time and put the new diaphragm and gasket on there were no bubbles in the line. I have sealed that leak again at the tank and will see what it does now.

 

[MickLovin]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

just posting some pics of the carbs on and the covers

 

[MickLovin]

Re: Help Frank - 100HP Chrysler carburettor change from wb24B to TC5D

Ok did a water test today and it did its hole shot fine, I am going to lift the motor up as it has a hydrafoil on it and I noticed it was under the water, and looks like I have to do the seals on the tilt trim as it would lift past the main ram and when I slowed down and lifted it it lifted fine only to pull back down when I took off.
I am pretty sure the motor could go to the next hole no problems as it is even with the bottom at the moment, I did however notice a definate 2-3 mph increase with the new carbs, the only thing I am worried about is a loud ping when I put it back into neutral.