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Idle jet -DELLORTO (type: 9892) SI- (42)

3330505
€7.90 *

incl. VAT plus shipping costs

In stock: can be delivered or picked up in the store
Carburettor jets
used with carburettors brands: Dellorto
used as idle jet in: Dellorto FHB, Dellorto SI
diameter head: 5 mm
thread: M5 x 0,75
length of thread: 6.5 mm
total length: 29 mm
P For this item you get fidelity point/s

Available versions

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Part no.: 3330505 Jet size 42 Price
€7.90
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Part no.: 7673101 Jet size 50 Price
€6.70
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Part no.: 25648162 Jet size 35-120 (3.4) Price
€6.79
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Part no.: 7676374 Jet size 38-120 (3.16) Price
€6.60
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Part no.: 7676375 Jet size 40-120 (3.00) Price
€6.60
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Part no.: 7676376 Jet size 40-130 (3.25) Price
€6.60
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Part no.: 7676377 Jet size 42-140 (3.33) Price
€6.60
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Part no.: 25648161 Jet size 42-160 (3.81) Price
€6.79
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Part no.: 7676378 Jet size 45-120 (2.67) Price
€6.60
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Part no.: 7676379 Jet size 45-140 (3.11) Price
€6.60
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Part no.: 7676380 Jet size 45-160 (3.56) Price
€6.60
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Part no.: 7676381 Jet size 48-100 (2.08) Price
€6.60
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Part no.: 2565163 Jet size 48-140 (2.92) Price
€6.79
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Part no.: 25648160 Jet size 48-160 (3.34) Price
€6.79
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Part no.: 2565120 Jet size 50-120 (2.40) Price
€6.79
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Part no.: 7676382 Jet size 50-140 (2.80) Price
€6.60
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Part no.: 2565160 Jet size 50-160 (3.20) Price
€6.79
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Part no.: 2565121 Jet size 52-120 (2.30) Price
€6.79
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Part no.: 2565140 Jet size 52-140 (2.70) Price
€6.79
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Part no.: 2565100 Jet size 55-100 (1.81) Price
€6.79
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Part no.: 2565161 Jet size 55-160 (2.91) Price
€6.79
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The secondary nozzle of the SI carburettor does not have the simple function of a conventional...Continue reading

Description


The secondary nozzle of the SI carburettor does not have the simple function of a conventional nozzle, i.e. the pure quantity regulation of the gasoline quantity. With the introduction of the PX in 1977, the previously used SI carburettor type and its auxiliary nozzles were modified. The old carburettor types, as they were used for example in the Rally engines, had a separate air duct for the auxiliary nozzles. These were therefore equipped with nozzles that could only regulate the amount of petrol (simply designated nozzles, e.g. Rally 200 ND=50)

DOUBLE FUNCTION
The new carburettor types have a closed air hole for the secondary nozzle. Piaggio has been using double function nozzles since the auxiliary nozzle, recognisable by the double designation (e.g. 55/160). For this purpose, the secondary nozzle is hollow drilled from above and thus ensures a corresponding premix of petrol with air.
I.e. the mixture preparation in the secondary nozzle area works as in the main nozzle stock via an air nozzle and a main nozzle, here only combined in one part.

Nozzle COMPARISON
In the past, a quotient was formed from the values for the air nozzle (160) and the actual nozzle size (55) (in this example = 2.91) in order to make it easier to compare the different nozzles with each other. The resulting value should then help to classify the nozzle into a rating system from lean to rich (the smaller the value the richer). However, this approach is very rudimentary and not always effective.

VENT Nozzle VS BENZINBOHRUNG
The air nozzle comes into play as a corrective element. As the speed increases, the engine receives more and more fuel from the petrol bore of the auxiliary nozzle. The air nozzle then mixes air proportionally to keep the ratio of air to gasoline always linear.
A 120' air nozzle has a bore of only 1.2mm, thus providing very little air and is correspondingly greasing. A 160' air nozzle provides a lot of air and is therefore rather lean.

CASE EXAMPLE
A 200cc engine should get a richer secondary nozzle. According to the old system a 52/140 was chosen instead of the standard 55/160.
The nozzle with 52/140 (2,69) has a smaller bore for the petrol (52) compared to a 55/160 (2,91), but at the same time also a smaller air nozzle (140). The smaller air nozzle greases massively from the medium speed range onwards, but the smaller petrol bore already becomes lean from idle throttle. Thus one receives a nozzle which behaves leaner up to the speed center, afterwards however clearly greases. This means that ringing in the medium speed range cannot usually be cured with such a nozzle. For example, a 58/160 would be better, but only Pinasco covers such sizes with nozzles that are only available in an expensive set.

INFLUENCE RANGE
It is important to know that the influence of the auxiliary nozzle extends over almost the entire speed range. At higher speeds and full slider stroke, the proportion of mixture of the auxiliary nozzle in the total mixture is relatively low but still clearly measurable.
If the proportion of air nozzles is reduced (i.e. instead of 160 a 140), the engine will run richer at the top and vice versa. The engine will also run much leaner with a smaller petrol bore in the auxiliary nozzle in push mode and during acceleration out.


(US)


(machine-translated)
 

Fits the following vehicles


Alternative items


Idle jet -DELLORTO (type: 9892) SI- (55-160) 2.91
variants Dellorto
2565161
Dellorto
Idle jet -DELLORTO (type: 9892) SI- (55-160) 2.91
17 further versions from €6.60
  • In stock: can be delivered or picked up in the store
    42
  • In stock: can be delivered or picked up in the store
    50
  • In stock: can be delivered or picked up in the store
    35-120 (3.4)
  • In stock: can be delivered or picked up in the store
    38-120 (3.16)
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