New
by Rex_tulips - 30/07/25 07:59 PM
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Aug 24th, 2023
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Joined: Feb 2019
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Talk Morgan Addict
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Planenut, same thoughts here. The high compression ratios require more octane to make them happy.
The light at the end of the tunnel is actually a train. 2019 M3W
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Joined: Jun 2012
Posts: 2,141 Likes: 43
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2012
Posts: 2,141 Likes: 43 |
Agreed LightSpeed but the S&S engine runs at 9.75:1 CR, so not wild for a normally aspirated engine and well within the range for 95 RON petrol. I use 98 RON most of the time, with a free flowing exhaust, and never have any problems with pinking. For the miles I do I like to put the best fuel and lubricants I can in my expensive X-Wedge, I want it to last a long time. Possibly the issue with the standard exhaust and pinking is due to the heat build up in the heads causing hot spots and pre-ignition?
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Joined: Feb 2019
Posts: 3,854 Likes: 2
Talk Morgan Addict
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I totally agree, best fuel and lubricants will help it last longer.
The light at the end of the tunnel is actually a train. 2019 M3W
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Joined: Aug 2017
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Talk Morgan Regular
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Talk Morgan Regular
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No modern engine I know of in road going cars has anything that really needs 98. Of course you can put it in, but you will achieve no benefit. I had an old Sierra that was specified for 98, if you put anything lower in it you could risk premature firing just by the compression (like a diesel), not the spark from the spark plug. But not so with a modern car. I also had an Elise - tried with both 98 and 95, noticed absolutely no difference. I hardly think that the MW3 S&S engine is high compression and really needs 98. So, if the engine can tolerate 95 anything above is a waste money, if 98 really is needed anything below can/will cause problems. Or am I totally wrong? Not wrong Robbie, but maybe a little behind the times. Modern high output engines , particularly those using forced induction or leaner air/fuel ratios, have particular need to avoid pre-ignition or detonation and manufacturers will specify (Europe) 97/98 Ron fuel for certain models. My AMG has a little notice by the fuel filler cap as a reminder! To protect these engines (for example where lower grade fuel is used, or conditions cause cylinder head or inlet charge temperatures to exceed the normal range) a piezo-electric sensor is built into each cylinder head to detect incipient pre-detonation and change the spark advance (via the ECU) to protect the engine. Sophisticated engines can do this individually by cylinder and highly-boosted engines will usually bleed a bit of inlet boost pressure at the same time. Not relevant to three-wheelers I know! But there are very good reasons why some engines specify 98 Ron. I am perfectly aware of the sensor system, and as I understand this permits a 98 specced engine to use 95, because the sensor picks up a possible pre-igntion cuased by 95 and adjusts the spark advance accordingly. It might not be preferrable, and you might loose a bit of power, as stated above. Stil, this doesn't explain why 98 should be any better in a 95 engine. Putting in 98 in such an engine will not provoke any pre-ignition, and then one is putting in combustible with a feature that is not needed.
Robbie the Norseman
2004 V6 Roadster
Sherwood green
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I usually use 95RON, not many petrol stations around stock 98/99. I did make an effort to run for an extended time on 98 with several full tanks. I noticed no difference in running & the consumption was maybe slightly improved but not enough to cover the increased fuel cost.
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Joined: Jun 2012
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Dreiradschubser Talk Morgan Regular
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Dreiradschubser Talk Morgan Regular
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Is there a relation between fuel with or without ethanol etc. and the lifespan of the fuelpump?
I have 20.000 km, no problems with my fuelpump and using 98 fuel in Europe.
Achim
4 aircooled cylinders, 7 tires, not waterproof: my m3w Bluebelle (2013) and my 2CV Gundel (1990)
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I have always run mine on Tesco’s Motillium 99 and get 35-40 mpg even with the corrected spedo, thanks Planenut👍
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Joined: Feb 2019
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Talk Morgan Enthusiast
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Is there a relation between fuel with or without ethanol etc. and the lifespan of the fuelpump?
I have 20.000 km, no problems with my fuelpump and using 98 fuel in Europe.
Achim Probably the biggest problem with ethanol is that if the vehicle sits for any length of time, any moisture that gets into the tank will more readily mix with ethanol and the ethanol h20 will settle out of the gas...Best way to solve that is use your vehivle on a regular basis
Rodger
2018 M3W "Dreamers on the Rise"
2004 Plus 8 (wife's)
old Goldwings and a couple of Harleys
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