Stihl BR 700 Curved Blower Nozzle (Performance Test)
A curved nozzle can change how a BR 700’s air reaches leaves, but it does not guarantee more clearing power. To judge it fairly, fit only a nozzle approved for your exact model, then compare it with the standard nozzle using the same blower, debris, surface, distance, and throttle. STIHL’s published airflow figures apply to a stated standard configuration, not automatically to a curved nozzle.
A blower nozzle can look like a small change, yet it may alter how easily you direct air under shrubs or along a curb. The paradox is that a more focused stream can feel stronger while clearing less ground at once. A useful performance test must measure the job, not just the sensation at the nozzle.
What the curved nozzle can—and cannot—tell you
A curved nozzle changes the direction and spread of the air leaving the tube. Its value is practical: it may help direct airflow into a particular work area. It does not, by itself, prove higher air speed, greater air volume, or faster overall clearing.
Start by confirming that the curved nozzle is approved for the BR 700 and fits the exact model and market version. STIHL accessory names and fit can vary, so check the model manual or current local parts information. Do not force a nozzle onto the tube or modify either part.
STIHL lists the BR 700 as a 64.8 cm³ gasoline, two-stroke backpack blower. Published figures include maximum air velocity of 238 mph (106 m/s) and air volume of 912 cfm (1,550 m³/h) for the specified standard nozzle and test configuration. These are not measured results for a curved nozzle. The figures also describe different things: air velocity is speed, while air volume is the amount of air moved over time.
A changed outlet shape can affect the air stream’s speed and distribution. It may concentrate airflow in one area and cover less width, or make it easier to aim under an obstacle. Without a controlled test or manufacturer data for that exact setup, there is no sound basis for assigning a percentage gain.
Key takeaway: Treat the curved nozzle as a change in air direction and control until a fair test shows a useful difference.
Set up a safe, repeatable comparison
A nozzle comparison is only useful when the conditions stay consistent. Use the same BR 700, fuel, debris, surface, operator, throttle setting, starting distance, and test time for both nozzles. Record the nozzle type and conditions so you can interpret the result later.
Before starting, check that the nozzle is fully seated and retained, and inspect the blower tube for cracks or other damage. Make sure the air intake and cooling passages are clear. Check that the throttle and stop controls work as intended. If a connection feels loose or airflow appears to escape at the joint, stop and correct the fit before testing.
Wear eye and hearing protection, sturdy footwear, and respiratory protection suited to the dust and debris. Keep bystanders away from the test area. Never direct the air stream at people, animals, open windows, or traffic. Test outdoors only: exhaust contains carbon monoxide, which can be fatal in enclosed or partly enclosed spaces. Keep hot exhaust parts away from dry vegetation and fuel vapors.
A practical test method
Choose one type of debris and one surface, such as dry leaves on pavement. Avoid mixing leaves with gravel, dust, wet material, or fragile plants; each responds differently. Mark a repeatable lane or area, and use a fixed starting point for each pass.
For each nozzle:
- Use the same throttle setting and starting distance.
- Sweep at a shallow angle, keeping the nozzle near but not touching the surface.
- Move debris into a defined row or collection zone rather than scattering it.
- Record the time, cleared area, or mass of debris moved, along with any missed patches.
- Repeat each run under the same conditions and compare the results.
If you use an anemometer, note its model, position, and reading method. A reading at the nozzle opening does not necessarily represent useful air movement at the ground. Avoid treating a single peak reading as a verdict: direction, stream spread, distance, and debris condition all affect the work.
| Record this | Why it matters |
|---|---|
| Nozzle type and fit | Confirms which configuration was tested |
| Debris and moisture | Wet or mixed debris can change the result |
| Surface and test area | Grass, pavement, and gravel behave differently |
| Distance, throttle, and time | Helps keep each run comparable |
| Cleared area or debris moved | Shows job performance, not just peak air speed |
Key takeaway: A measured job result, repeated under matched conditions, is more useful than a quick hand-feel test.
Field-fit examples: where the shape may matter
These examples are test scenarios, not claims of measured BR 700 results. They show how to judge the nozzle against the work you actually do. I would keep the standard nozzle as the baseline and record whether the curved option improves control, speed, or access in each setting.
Along a curb: Compare how well each nozzle moves the same dry leaves into a row without pushing them into the road or spreading them over the pavement. A curved shape may make it easier to aim at the surface, but only your matched trial can show whether that improves the result.
Under low shrubs: Check whether the curved nozzle provides useful access without striking branches or directing debris into planting beds. Reduce throttle near mulch and fragile plants. If the air scatters mulch or raises dust, the setup is not suitable at that throttle, even if the area looks clear.
On gravel: Use caution. A high-velocity stream can move loose stones and throw debris. Do not point the jet at people, vehicles, windows, or planted areas. If material lifts or travels beyond the intended work zone, stop and change the technique or task area.
For each scenario, note both productivity and control. A nozzle that clears a narrow strip quickly may be less useful across a wide lawn. A wider pattern may reduce the number of passes but be harder to direct near borders. The better choice depends on the job, not on the nozzle’s appearance.
Fit, fuel, and troubleshooting before the next start
Fit and engine condition affect a comparison. A loose joint, blocked intake, dirty filter, or poor fuel can reduce performance and make one nozzle seem better or worse for the wrong reason. Inspect the machine before and after testing, and stop if it runs erratically or loses power.
The BR 700 uses a two-stroke fuel mix. STIHL specifies a 50:1 ratio when using STIHL two-stroke oil; follow the manual for your exact model and fuel instructions. Measure the mix accurately or use STIHL MotoMix where specified. Do not run straight gasoline or an incorrectly mixed fuel, as poor lubrication can cause severe engine damage.
Before and after use, inspect the nozzle joint, tube, housing, straps, throttle linkage, air filter, and spark-arresting screen where fitted. Clear debris without pushing it into the intake. Follow the model manual for cleaning and service intervals. If the engine loses power, runs unevenly, or the nozzle joint leaks, stop and diagnose the cause. Do not alter carburetor limiter settings or modify the nozzle to compensate.
| Symptom | Checks to make |
|---|---|
| Weak or uneven airflow | Check nozzle fit, tube damage, intake blockage, and air filter condition |
| Engine runs poorly | Stop and check fuel mix and service items listed in the manual |
| Air escapes at the joint | Stop, inspect the connection, and confirm the approved parts are seated and retained |
| Debris scatters instead of forming a row | Adjust angle, distance, throttle, or nozzle choice; repeat under matched conditions |
Key takeaway: Fix machine or fit problems first. A nozzle test cannot give a fair answer if the blower is not in good working order.
Store the blower safely and preserve the test result
Seasonal storage affects the next start and can also affect a future comparison. Let the engine cool before inspection, refueling, or storage. Keep fuel away from ignition sources, and store the blower upright in a ventilated location.
Follow the BR 700 manual’s fuel-storage procedure for the length of storage you expect. Before returning the blower to service, use fresh fuel as directed and check for leaks, a restricted intake, or loose and brittle connections. If the machine is difficult to start or runs poorly, diagnose it before judging nozzle performance.
Never start or warm the blower in a garage, trailer, shed, or other enclosed or partly enclosed space. Carbon monoxide can build to a fatal level without a clear warning. Run the machine outdoors only.
Keep your test notes with the machine’s service records. Include nozzle type, fuel, debris, surface, and results. That simple record helps you compare the same job next season without relying on memory.
Key takeaway: Safe storage and repeatable notes help separate a nozzle’s effect from changes in fuel, condition, or test conditions.
Frequently asked questions
Does a curved nozzle increase BR 700 air speed?
Not necessarily. The BR 700’s published 238 mph (106 m/s) maximum applies to a specified standard-nozzle test configuration, not automatically to a curved nozzle.
Does it move more air than the standard nozzle?
There is no general result to assume. Air volume depends on the tested configuration and conditions; compare the two nozzles in a controlled trial or use model-specific manufacturer data.
How do I confirm the nozzle fits my BR 700?
Check the exact model manual or current STIHL parts information for your market. Use only an approved nozzle, and confirm it seats and stays retained without force.
What should I measure in a performance test?
Record the nozzle, debris, moisture, surface, distance, throttle, time, and cleared area or debris moved. Repeat runs under the same conditions.
Should I compare nozzles at full throttle?
Use the same throttle setting for both tests. Choose a setting suited to the debris and surroundings, and reduce throttle near gravel, mulch, dust, and plants.
Can I test on wet leaves?
You can, but keep wet-leaf trials separate from dry-leaf trials. Moisture changes how debris moves, so mixing conditions makes the comparison unreliable.
What if the engine loses power during the test?
Stop. Check the fuel mix and inspect the intake, air filter, tube, and other service items covered by the manual. Do not adjust carburetor limiter settings to compensate.
Can I run the blower in a garage with the door open?
No. Operate and start it outdoors only. A partly enclosed space can allow fatal carbon-monoxide exposure.
Is a higher air-speed reading proof of better clearing?
No. Peak speed alone does not show useful clearing width, airflow distribution, or how much debris reaches the intended row.
What is the safest way to aim the nozzle?
Sweep at a shallow angle near the surface, keep people and animals clear, and never direct airflow toward windows, traffic, or loose gravel.
(This article was written by one of our staff writers, Harrison Croft. Visit our Meet the Team page.)
