DCNF Throttle Linkage

[Darren]

Anyone know where I can get hold of one this side of the pond?

Cheers

Darren

[Darren]

Ignore this one - since found out that I can use the original throttle linkage

[DJ]

You should be aware that the Alquati DCNF linkage setup came with a replacement for the stock bell crank lever that has an elongated arm. If you don't have this or don't modify yours, you may not get full throttle opening.

[Darren]

Hi DJ,

thanks for that - I will bear it in mind when I assemble everything up - just waiting for the overhaul kits first.

Cheers

Darren

[Otto-valvole-per-tutte]

You should be aware that the Alquati DCNF linkage setup came with a replacement for the stock bell crank lever that has an elongated arm. If you don't have this or don't modify yours, you may not get full throttle opening.

DJ, could you expand a bit on this one since i'm afraid i don't exactly understand what is being meant. Especially the bit about the "stock bell crank that has an elongated arm".

Cheers, Pieter

[1,6 HF]

DJ, could you expand a bit on this one since i'm afraid i don't exactly understand what is being meant. Especially the bit about the "stock bell crank that has an elongated arm".

Cheers, Pieter

Damned English grammar; "that" refers back the "replacement". In other words, he means that the linkage came with a replacement for the stock bell crank, and that the replacement has an elongated arm.

[Otto-valvole-per-tutte]

Damned English grammar; "that" refers back the "replacement". In other words, he means that the linkage came with a replacement for the stock bell crank, and that the replacement has an elongated arm.

Thanks Ed, but still no lightbulb burning :-)

A piccie would do the trick i guess, to show what part is being meant.

[DJ]

I can't find any pictures but I'll try to explain a little more clearly.

The bracket that hangs off the front-side of the stock carburettor has a pivot shaft which mounts an "L"-shaped piece. This piece is what I'm referring to as the bellcrank. One end of the bellcrank connects to the rod which actuates the throttle shaft on the carb and the other connects to the accellerator cable.

The stock bellcrank has arms that are essentially equal in length. The replacement bellcrank provided with the Alquati manifold has one arm noticeably longer than the other. This provides more travel on the throttle shaft and allows the DCNFs to open fully. With the stock bellcrank, you may not get full throttle actuation.

[John Allen]

here is a photo of the bellcrank from my car. You can see that one arm has been extended about 1/2" and has a 'curve' to it. The threaded arm is slipped onto the protruding rod on the carb throttle shaft.

[Darren]

Hi John,

Thanks for the shot, which explains all clearly! I have just gone with the standard linkage which may not allow me to get full throttle then. Is there any chance that you could do a tracing of that arm and email it across to me please? I can then cut what I have and weld in an extension piece? Or should I try and locate a 'proper' one?

Cheers

Darren

[davidb]

I might need one of these gizmos too. Haven't taken a
thorough look @ my "soon-to-be-installed" set-up. Doesn't
look like pierce manifold has one. Well @ least not on their
site. Maybe they have some floating around in their ware-
house.

[davidb]

TMH has what they call throttle linkage w/cable connector for
DCNF/DCOE carbs for $24, part # PP1023 but no picture. Hmmm?

[John Allen]

Hi John,

Thanks for the shot, which explains all clearly! I have just gone with the standard linkage which may not allow me to get full throttle then. Is there any chance that you could do a tracing of that arm and email it across to me please? I can then cut what I have and weld in an extension piece? Or should I try and locate a 'proper' one?

Cheers

Darren

It looks like someone at Alquati just cut the stock ear off and inserted a strap of steel in between the two parts, so yes you should be able to cut and reweld yours. I suspect a 'true' one will be accompanied with a manifold.

I saw that someone else here used the standard bellcrank linkage but mounted a new "ball" lower down on the carb arm. I'm going to look into that as well, maybe come up with a retrofit kit??? I need to make up at least one more linkage so I can sell a set or two of my Alquati DCNFs (anyone interested in a set of carbs??).

[DJ]

These parts were custom modified pieces that were provided with each Alquati manifold along with the inter carb linkage and a new accellerator rod. You won't just find one in stock anywhere.

You might luck out and find one that someone is willing to part with but you will likely need to make it yourself.

[Otto-valvole-per-tutte]

Thanks all.

I think i'm in the same ballgame. I have the Alquati manifold, and have the carbs and airbox, but not the specific "modified" part. So it's up to the Montehospital (maybe we could do a groupbuy?), or make something myself.

Cheers, Pieter

[davidb]

Ha-ha-ha I smelled a rat here. Alquati made the manifolds, Weber
the carbs. Alquati said we need a different bellcrank so Alquati
made those. Classic Italian mis-que. I'm a newbie to this forum
[3 yrs.] but me-thinks if you didn't buy one of these set-ups 30
yrs. ago when offered new you didn't get all the right stuff. Last-
ly why the relative explosion on this topic of late? Half a dozen
people doing a conversion @ once? I'm still far, FAR done w/my
install but maybe a group-grope request to THM would help?
What the hell is the point of going thru this conversion misery
if the damn throttle won't open fully & take ALL advantage of
the larger carbs? Assinine, AHHHHHHHH !!!!!!!!!! Enough . . .

[Darren]

Hi John,

Surely moving the ball joint lower and therefore closer to the pivot point will result in less movement/travel, not more? I'll try making up a new one and keep you posted on progress. Oh and thanks, but I'm set with carbs cheers!;o)

DJ, I'm afraid you're probably right - the choices are either live with the standard set up or fabricate something yourself. I think I'll look for another throttle linkage to modify, just in case I foobar the one I have!;o)

Pieter,

The MH hospital advises to use the original carb linkage and modify where required. I was lucky when I source my set up - they were very scruffy, but complete with connecting linkage and alquatti manifold, but the cable linkage was a pos. Still a couple of weeks soaking in the parts washer and a good clean has brought everything up like new!;o)

Hi Davidb,

I've had the carbs around for ages, but rapidly approaching a deadline to get the car finally on the road for Le Mans this year and I thought I my as well get it all sorted at once! ;o) Now if only I could get time for a couple of weeks off work!!;o)))

Darren

[John Allen]

Hi John,

Surely moving the ball joint lower and therefore closer to the pivot point will result in less movement/travel, not more? I'll try making up a new one and keep you posted on progress. Oh and thanks, but I'm set with carbs cheers!;o)

Darren

Moving the ball closer to the pivot of the CARB will allow more throttle opening for a given movement of the bellcrank. This is actually common practice with Weber carb setups, the carb arm is shorter than the arm the throttle cable is attached to. Also, by varying the angular relationship between the rod and the arm, a progressive carb opening can be achieved.

Looks like its time to make up a few sets of links......

[davidb]

For one who has been spoiled w/the F.I. systems of these cars:
the E.C.M. pretty much takes care of most all things [almost],
as opposed to my gross, total lack of knowledge of carbs, much
less this conversion you make it sound so simple & straightforward.
Keep posting please, I among others, are apparently lost . . .

[Darren]

Hi John - I'll take one of those sets when you're done Please!;o))

Darren

[John Allen]

For one who has been spoiled w/the F.I. systems of these cars:
the E.C.M. pretty much takes care of most all things [almost],
as opposed to my gross, total lack of knowledge of carbs, much
less this conversion you make it sound so simple & straightforward.
Keep posting please, I among others, are apparently lost . . .

I have been bitten by the FI bug, that is why I will be selling all of my DCNF stuff!

I'm sorry if I make it 'sound easy', I know its not and can be difficult to describe in text. The original parts definitely make it much easier to install.

[Darren]

Hi John,

Just re-read your post in the cold light of day, rather that an the wrong end of a long day - and you did say the Carb end being altered, which makes much more sense! I'll have another look, but as mentioned before, if you're making up sets then you have a customer right here!

FI is a project for the Vx car, but that's a long way off just yet!

Cheers

Darren

[John Allen]

Hi John,

Just re-read your post in the cold light of day, rather that an the wrong end of a long day - and you did say the Carb end being altered, which makes much more sense!

Darren

I good with it, I know I have been known to read a post at the wrong time of day and miss something. I've also been known to accidentally leave out an important detail in a post, I had to re-read mine to make sure I didn't!

[Otto-valvole-per-tutte]

After all the linkage joy i believe the alternator bracket needs to be changed as well .....

[DJ]

If you're just talking about changing the alternator bracket because of installing an Alquati manifold, it shouldn't be necessary.

The biggest issue is that the connectors on the back of the alternator come REALLY close to the manifold and can short out. I initially solved that by using a right-angle insulated connector instead of the original straight connector. I later installed a slightly longer belt, then added an extension on the bracket to give it even more space.

Later, I changed over to a customized AC-Delco alternator with much higher output that Jim Fierst had built by a local shop. If I remember correctly, it was from a Pontiac application and used a Ford pulley. Jim also turned out some new spacers for the bracket that allowed it to align correctly. This alternator has no connections on the back to interfere with the manifold.

You can find some pictures of the conversion with the Alquati manifold installed here (http://lancisti.net/photopost/showgallery.php?cat=845&ppuser=0). If I can find any other shots I'll post them too.

If we can dig this info up again I'll formally document it in a tech note and post it in the downloads section.

[Otto-valvole-per-tutte]

Great DJ. I see a dipstick attached as well. Almost afraid to ask but does that thing provide any probs?

[DJ]

No problems at all from the dipstick.

[Otto-valvole-per-tutte]

Surely moving the ball joint lower and therefore closer to the pivot point will result in less movement/travel, not more? I'll try making up a new one and keep you posted on progress. Oh and thanks, but I'm set with carbs cheers!;o)

Darren, any news on this part of the joy? :-)

[Darren]

Nothing as yet Pieter - all connected up, but need to check to make sure I'm getting the full range of movement. I'll post up once I have an update, hopefully tomorrow.

For the record - alquatti manifold and I've kept the original alternator bracket and dipstick

Cheers

[Otto-valvole-per-tutte]

Darren, much appreciated. Did you, in the end, modify anything yourself on the throttle system?

Cheers, Pieter