Carby Tuning 18rc

[toylica]

Hello Guys...

This isn't a really .... 100% answerable or mechanical question....

I have a 18rc.... i know i know... And i have looked around at many different sources... and they all seem to contradict.... anyway.... I have been told & know that my Lica' is running rich...... but How do i learn how to tune my carby? ... I have already had some experience with engines & carbys and have researched the mechanics.... but still i have no idea where to start?

I don't know if anyone could type out a step by step general guide?... with just general needle names.... (i have had a look at the thread on here about them but mine.... you guessed it... are different ....)

thanks in advance..


Dave

[MWP]

You cant. The main jet isnt adjustable from memory.

You can only set the idle speed and the idle jet.

[maurice c]

is it still the original carby, i think that its an aisin POS.

[airfireman1]

Best you can do is go and buy a carby overhaul kit, make sure it is the one to suit your carby as there are a couple of types. strip the carby down and replace all the parts with the new ones that come in the kit.
The main reasons for it running rich are 1- high float level, 2- worn main jet,3-secondary throat opening too early.
The kit will come with a diagram and tell you the float level you need to set.
Cheers Dave

[toylica]

ook - thanks. Yeh secondry isn't even working lol ... Float is about ... 2mil from the top... does look a bit high really,,,,,

Ill have a look around.


Thanks


Dave

[toylica]

is it still the original carby, i think that its an aisin POS.

Yep.... that be the one....

my friend has a weber hes not using..... *Shifty Eyes*

[thechuckster]

replace it with a 2bbl webber from a TC or similar 2 litre Cortina - try to do this cheaply or for no money as spending money on an 18RC is a pointless exercise.

[MWP]

replace it with a 2bbl webber from a TC or similar 2 litre Cortina - try to do this cheaply or for no money as spending money on an 18RC is a pointless exercise.

Not true.

I installed a Webber 34ADM on my 18R-C. It brought new life to the engine.
For ~$50, it was the best $$s i ever spent on the car.

[Cob604]

ook - thanks. Yeh secondry isn't even working lol
Dave

how did u test this theory?

thx

[toylica]

how did u test this theory?

thx

well.... i guess you know something i dont.


the throat isn't wet.....someone said that the diaphragm dies.....?

thnx

[toylica]

Not true.

I installed a Webber 34ADM on my 18R-C. It brought new life to the engine.
For ~$50, it was the best $$s i ever spent on the car.

wow... are they that cheap? where from? or just.... snipe one on ebay?


thnx


dave

[Cob604]

hey

i had mine die a few weeks ago, the diaphragm opens it therefor u wont see it open if u push the throttle, it only opens under load. so i put a new one on & just cruising down a road if u push ur foot to the floor at a point the intake noise gets deeper & madder

with car off when i opened the secondaries by hand i could hear the air coming out of the diaphragm

just from memory

thx

[MWP]

It was from a u-pull-it off a Falcon XE/XF.
The 34ADM isnt the ideal carb (it is too large) so it took a decent amount of work to get it tuned properly.

the throat isn't wet.....someone said that the diaphragm dies.....?

Yup, they do.
I fixed this on my original 18R carb which made a huge difference.
I fixed it by using a simple wire link to make the second butterfly open after ~75% throttle (bypassing the diaphragm).

Its still worth looking at a Weber carb anyway, the 34ADM made a big difference even after the original carb fix.

[toylica]

I fixed it by using a simple wire link to make the second butterfly open after ~75% throttle (bypassing the diaphragm).

Interesting.... so if i wanted to test the diaphragm.... how would i go about it.... and... is it just the diaphragm that is nearest the front of the car...?

When i got flat to the floor i do hear the deeper sound and such (especially with the modded intake)

thanks


dave

[MWP]

You cant test it without pulling it apart.

Its diaphragm actuated to stop it from opening at too low a RPM which could then stall the engine.
If your hearing that deep sound throughout the rev range at full accel, then thats not it.
If it is working, you should hear the note change or get louder at some point through the rev range.