Poor MPG, oily smell from exhaust and compression test. - Triumph Forum: Triumph Rat Motorcycle Forums
Tiger's 885i & 955i - Mods & Workshop Workshop and technical talk for the 885i & 955i Tigers

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post #1 of 22 (permalink) Old 04-12-2017, 02:15 PM Thread Starter
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Poor MPG, oily smell from exhaust and compression test.

Hi All,

I've been getting poor MPG lately from my 2006 955i and I've had a rich fuel / oil smell from the exhaust for years. The bike uses oil as well.

I got round to doing a compression test today, on what is a cheap and cheerful tester that I don't expect to be 100% accurate. The results were quite similar for both a cold and hot engine test:

For pistons 1 - 2- 3.

Cold engine: 105 - 110 - 100 (pretty poor IMO)

Cold engine with engine oil added to cylinders: 140 - 140 - 140.

Hot engine: 110 - 110 - 110.

Hot engine with engine oil added to cylinders: 140 - 140 - 140.

Looking at a good few videos online for Triumph engine compression tests, they are all above 150psi on a cold engine, so I guess my piston rings are worn. The increase in PSI with the addition of engine oil to the cylinders pretty much backs that up.

Thanks Triumph for your crap piston ring design

Safe riding.
Regards,
Graeme.
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post #2 of 22 (permalink) Old 04-12-2017, 02:47 PM
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Quote:
Originally Posted by Tiger-G View Post
Hi All,

I've been getting poor MPG lately from my 2006 955i and I've had a rich fuel / oil smell from the exhaust for years. The bike uses oil as well.

I got round to doing a compression test today, on what is a cheap and cheerful tester that I don't expect to be 100% accurate. The results were quite similar for both a cold and hot engine test:

For pistons 1 - 2- 3.

Cold engine: 105 - 110 - 100 (pretty poor IMO)

Cold engine with engine oil added to cylinders: 140 - 140 - 140.

Hot engine: 110 - 110 - 110.

Hot engine with engine oil added to cylinders: 140 - 140 - 140.

Looking at a good few videos online for Triumph engine compression tests, they are all above 150psi on a cold engine, so I guess my piston rings are worn. The increase in PSI with the addition of engine oil to the cylinders pretty much backs that up.

Thanks Triumph for your crap piston ring design
How many miles do you have, not sure if you said but what's the mpg?

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post #3 of 22 (permalink) Old 04-12-2017, 04:23 PM Thread Starter
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It's got 47,000 miles on the clock and it's down to 35 - 40mpg

Think I'm gonna put a new O2 sensor on it to see if that improves the MPG.

Safe riding.
Regards,
Graeme.
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post #4 of 22 (permalink) Old 04-12-2017, 07:48 PM
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Oh, ok , what was the mpg?

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post #5 of 22 (permalink) Old 04-12-2017, 07:49 PM
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Sorry, I mean before you noticed the issue

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post #6 of 22 (permalink) Old 04-13-2017, 12:16 PM
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My 2006 955 s also using a bit of oil (61000 miles on it) Never really checked MPG but don't think I've ever got much more than 40 out of it-though I guess you're talking imperial gallons, in which case 40 isn't so great
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post #7 of 22 (permalink) Old 04-13-2017, 01:23 PM
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Did you open the throttle when you did the compression test?
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post #8 of 22 (permalink) Old 04-13-2017, 02:24 PM
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I rarely get over 40mpg. My dad has one and hasn't gone over 40 as well. Seems mid 30s is the norm for us .

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post #9 of 22 (permalink) Old 04-13-2017, 04:21 PM Thread Starter
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Oh, ok , what was the mpg?

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Was getting about 44mpg last year.
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Safe riding.
Regards,
Graeme.
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post #10 of 22 (permalink) Old 04-13-2017, 04:22 PM Thread Starter
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Wink

Quote:
Originally Posted by CharlieS View Post
Did you open the throttle when you did the compression test?
Yep, throttle open on test

Safe riding.
Regards,
Graeme.
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