Help Quick Fuel SL450SV & Y Block 292
 

Dear .. I have a 1982 f100 (Argentina) with a Ford V8 292 Phase 2 engine (similar to the Y block, only the cylinder caps change) and I installed a quick fuel SL450SV carburetor with a single plane intake. The engine is stock .. electronic ignition and headers.
Originally the carburetor came with 56 primary jets and 60 secondary jets ... I put 55 primaries and improved a lot, the problem rises when regulating the secondary ones. When they open, bog is created instantaneously, the only configuration that works is opening the secondaries very little and almost at the end of the rpm (3500 of 4500). I don't know if the bog is caused by lean condition or rich. What do you suggest?
Attached images of the spark plug, the engine and the opening of the secondaries...

Greetings from Argentina!
PD: This website describes the differences between the American Y block and the Argentine phase 2
http://www.fordv8argentina.com.ar/di...sentref1f2.htm

Re: Help Quick Fuel SL450SV & Y Block 292
 

The bog or hesitation could be caused by too light of a spring on the secondary diaphragm. Also, the straight slotted screw in the picture of the diaphragm housing I believe is for adjusting the amount of suction on the diaphragm on the Quick Fuel carbs. You can play with that to see if there is an improvement. I'm doubtful changing from a 56 to 55 primary jet really made a difference.
Also, are you sure the choke is opening up all the way ? I see the ground wire for the heated thermostat cap is not connected.

Sal

Re: Help Quick Fuel SL450SV & Y Block 292
 

That single-plane intake manifold probably is contributing to your problems. A single-plane manifold and 465 cfm carburetor is an unusual combination.

Re: Help Quick Fuel SL450SV & Y Block 292
 

Precisely what I was telling you is that as soon as I give more opening to the secondaries, with the regulation screw, the bog is produced immediately. I checked it out with the bread twist ..
In the image you can see what you can open without bog.
As for the choke ... it opens completely and the ground is connected to the carburetor as it comes by default.
The change between the two jets was important, the engine became more responsive .. it was kind of slow with the 56.
Greetings.

Re: Help Quick Fuel SL450SV & Y Block 292
 

Possibly lose vacuum very quickly with the single plane intake ..?
The bog can be produced because it is very rich in the secondary ones?
As I mentioned, with the 56 jets in the primaries the engine was slow ... in fact, a flat spot was produced between 1500 and 2000 rpm in WOT.
Although with the 55 jets it is produced, it is much less and improves a lot.
Greetings.

Re: Help Quick Fuel SL450SV & Y Block 292
 

First, set the ignition timing with a vacuum gauge. More advance may help the flat spot. Then keep slowing the secondaries. In the US, we use a spring kit from Holley. It has a half dozen colored springs you can try.

Re: Help Quick Fuel SL450SV & Y Block 292
 

The timing is configured with the vacuum gauge and the idle mixture. The diaphragm of my carburetor is adjustable, but as soon as I open it a little, it bogs.
Could it be that the engine does not need the secondary ones?
Is the carburetor too big for the standard engine?
Or by reducing the jets of the secondary schools could they open more?
My secondary jets are 60.
Greetings!

Re: Help Quick Fuel SL450SV & Y Block 292
 

What made you decide on a SINGLE PLANE INTAKE on a carburetor street engine?

Way too lean -

https://www.fordbarn.com/forum/attac...5&d=1601386522

Re: Help Quick Fuel SL450SV & Y Block 292
 

Your carburetor is not too big.

Re: Help Quick Fuel SL450SV & Y Block 292
 

As I mentioned, with one more measure of jets, the engine gets sluggish in the middle regimes.
I decided on that intake thinking that in the future change the cam and increase the compression ... but I do not know when that can happen.
With the single plane from 3000 rpm he gets furious.
In my country a wideband is quite expensive, you will already know the economic problems of Argentina.
In the future I will try to acquire one to see what is happening.
Greetings!

Re: Help Quick Fuel SL450SV & Y Block 292
 

When I decided to buy it I read a lot, and many said that 465cfm is adequate. I also saw that the 57´ 312ci had that carburetor originally with jets of 55 in the primaries and 48 in the secondary ones. I know my carb is not the same as that 465cfm but the 60 jets in the secondaries won't be too much and is that why this happens?
Greetings!

Re: Help Quick Fuel SL450SV & Y Block 292
 

A 400 to maybe 500 cfm 4 barrel carburetor with a vacuum operated secondary is not too big for a 292.

I agree, the color of the center of that spark plug indicates a 'lean' fuel /air mixture.

I may be assuming too much about your comment above but...
because of all the internal construction & operational differences, the jets in one brand and size of carburetor cannot be compared to the primary and secondary jet size in a different brand or model of carburetor.
They may be similar, but it is just as likely they are not.

A jet size that works well in one carburetor on an engine can be completely wrong in another brand or model carburetor on the same engine. The correct jetting in a particular carburetor is specific to the engine / carburetor combination and the altitude & other conditions in which the car is driven.
.

Re: Help Quick Fuel SL450SV & Y Block 292
 

Your main problem is the intake type. It is generally used for track. There is very little low-end. It can be used for street but the engine has to be modified with a low rear. Do you still have the OEM dual plane 4V intake and/or was one offered for the PHASE 2?

Read this for theory -

https://www.enginelabs.com/engine-te...or-dual-plane/

Re: Help Quick Fuel SL450SV & Y Block 292
 

dmsfrr Thank you very much for your reply.
What he tells me is correct, I will try when I can make time to place bigger jets in the secondary ones and smaller ones to see which of the two configurations allows me to regulate the opening before. Greetings.

Re: Help Quick Fuel SL450SV & Y Block 292
 

The original intake is 2bbl, it was never manufactured for 4bbl, some machines transform it into 4bbl. As a last alternative, you could modify the original. Thanks for the article that you shared with me. Greetings.

Re: Help Quick Fuel SL450SV & Y Block 292
 

Was the engine running with the 2-barrel carburetor and intake manifold in place? The easiest and cheapest thing to do would be to put the 2-barrel intake manifold and carburetor back on the engine. Rebuild the 2-barrel carburetor if necessary. Your stating that the "cylinder caps" are different, I'm assuming that you mean that the intake ports are not stacked, one on top of another, but are inline, side-by-side. This could limit your intake manifold choices, but I don't know what's available in Argentina for your application. If you are determined to use the four-barrel carburetor, you will need to find a dual-plane, four-barrel intake manifold that has the same intake ports as your cylinder heads ("caps"). In the meantime, you might want to look for internet articles that explain the differences between dual-plane and single-plane intake manifolds and how or when they should be used.

Re: Help Quick Fuel SL450SV & Y Block 292
 

SOURCE - http://forums.y-blocksforever.com/Topic41341-1.aspx

Re: Help Quick Fuel SL450SV & Y Block 292
 

Yes, it is basically the same block with some improvements, such as the cylinder heads (similar to 302 engine), a water pump with two circulation channels. Except for the cilinder heads and the camshaft, the rest of the parts are 100% compatible with the Y block, that's why I made my query in this forum. In Argentina it was manufactured in some f100s until 1990 and in the Argentine ford fairline (same as the 1969 ford torino 4 doors) until 1982. https://es.wikipedia.org/wiki/Ford_Fairlane_(Argentina) My father had one (Fairline) and I could never forget the sound of that engine, that's why I bought this f100! Greetings!

Re: Help Quick Fuel SL450SV & Y Block 292
 

This is finding out if it is possible to machine the original intake to make it 4bbl ... if so, possibly it will. Thank you all very much for your suggestions! Greetings!

Re: Help Quick Fuel SL450SV & Y Block 292
 

A 4bbl to 2bbl adapter flange would be much easier. See the example at this link.
Although probably not as original looking.

https://www.amazon.com/Mr-Gasket-2-B.../dp/B00068OS2W

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