Fuel Flow on Climb

Guest Discussion
1

I’m only getting 13.5 - 14.0 GPH fuel flow, full throttle on climb (SR20).

I think this might be unusual, and the cause for my 220+ degree oil temps.

Experience of others?

Thanks.

Andy

2

Andy,

I’m pretty sure mine is higher, but I don’t remember by how much. Will try to make a note of it today. Is your 13.5 - 14.0 GPH with the boost pump on?

  • Mike.

I’m only getting 13.5 - 14.0 GPH fuel flow, full throttle on climb (SR20).

I think this might be unusual, and the cause for my 220+ degree oil temps.

Experience of others?

Thanks.

Andy

3

My fuel flow is about 17 on the gage in the SR20.

Timm Preusser N747TG

I’m only getting 13.5 - 14.0 GPH fuel flow, full throttle on climb (SR20).

I think this might be unusual, and the cause for my 220+ degree oil temps.

Experience of others?

Thanks.

Andy

4

Mike, boost doesn’t seem to make much of a difference.

According to my interpretation of the POH, which doesn’t seem to be specific, 14 seems the norm. Here’s my math:

(Page 5-24)

SL to 8,000 foot climb

11.3 minutes = .188 hours

2.6 gallons consumed

1/.188 X 2.6 = 13.8 GPH

Does this make sense to you?

Appreciate any input. Candidly, I hope my math is flawed. If it’s supposed to be higher, and I have it fixed, maybe I’ll have better performance in the heat. At this point, my oil temp goes to 220 and sometimes flirts with 230 on hot days. Top acceptable is 240, but this can’t be good for the engine. (Maybe it’s not a big deal.)

Andy

Andy,

I’m pretty sure mine is higher, but I don’t remember by how much. Will try to make a note of it today. Is your 13.5 - 14.0 GPH with the boost pump on?

  • Mike.

I’m only getting 13.5 - 14.0 GPH fuel flow, full throttle on climb (SR20).

I think this might be unusual, and the cause for my 220+ degree oil temps.

Experience of others?

Thanks.

Andy

5

Cirrus told me to make sure the main fuel pump is working at full pressure (always)! He said this can easily wear and requires periodic adjustment! If your speed has slowed somewhat and it isn’t ‘bugs’ it is probably the fuel…if it is the fuel…oil temp will soar. Maybe it’s me…but, i leave my ‘boost’ on during the steep climb and it seems to help a few degrees.

Don

Mike, boost doesn’t seem to make much of a difference.

According to my interpretation of the POH, which doesn’t seem to be specific, 14 seems the norm. Here’s my math:

(Page 5-24)

SL to 8,000 foot climb

11.3 minutes = .188 hours

2.6 gallons consumed

1/.188 X 2.6 = 13.8 GPH

Does this make sense to you?

Appreciate any input. Candidly, I hope my math is flawed. If it’s supposed to be higher, and I have it fixed, maybe I’ll have better performance in the heat. At this point, my oil temp goes to 220 and sometimes flirts with 230 on hot days. Top acceptable is 240, but this can’t be good for the engine. (Maybe it’s not a big deal.)

Andy

Andy,

I’m pretty sure mine is higher, but I don’t remember by how much. Will try to make a note of it today. Is your 13.5 - 14.0 GPH with the boost pump on?

  • Mike.

I’m only getting 13.5 - 14.0 GPH fuel flow, full throttle on climb (SR20).

I think this might be unusual, and the cause for my 220+ degree oil temps.

Experience of others?

Thanks.

Andy

6

Mike, boost doesn’t seem to make much of a difference.

Andy,

Here are the notes I made during climbout yesterday:

OAT = 18C

Climbing from 1,500’ to 2,500’

Forgot to note RPM and MP, but at max available power, mixture full rich:

Readings are Boost Pump OFF/ON:

ICDS Engine Monitor: 16.5/17.0 GPH

Analog gauge: 16.0/16.7 GPH

Hope this helps…

  • Mike.