Middlebridge Fuel

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giddo
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Post by giddo » Mon May 11, 2020 10:11 pm

I would like to ask the Middlebridge drivers what fuel they use.
Can one use unleaded ?
Do they pink on 95 fuel ?
Does 97 grade give worthwhile or cost effective, inprovement in performance ?
Any other notable points.


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Post by peter freeman » Mon May 11, 2020 10:53 pm

I use 99 for all four cars - two 1800TI's one Essex and the MB



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Post by Will Anderson » Mon May 11, 2020 11:14 pm

Peter has had some superb results with 99 but I have always used 95 and on a motorway run at legalish speeds get low to mid 30's mpg. Never known it to pink on 95 but never tried 97/99.

To quote Peter from last year's post Silverstone MESSage: “I went down to Northampton with 97 Octane petrol. In the heat and with a number of traffic hold-ups the fuel consumption worked out at 29.65mpg. Filled up for the return journey with 99 octane petrol and thought I would do better on the way back as I kept to the speed limits - cooler and no hold-ups on the M1 to Leeds and from there to Newcastle on the A1. When I filled up 1/2mile from home I checked the mpg - 42.2957mpg. I did the calculation twice to make sure I had not hit the wrong buttons ( 4.546 litres to the gallon ) - is this a record , it has left me speechless.”


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Post by Mikelima48 » Mon May 11, 2020 11:46 pm

I drive a Scimitar Sabre 1800Ti and a Jaguar XK Coupe. The Sabre handbook recommends 97 octane fuel and the Jaguar 95 minimum. I use super unleaded in both cars. Both achieve a fairly low annual mileage but I think the additives are worth the extra few pennies per litre. Interestingly though, I used to drive a SAAB 93 Turbo X. (2.9 litre turbocharged V6 with Hirsch performance upgrade.) The recommended fuel for that was 98 RON. During a fuel tankers' strike I could only fill up with Sainsbury's standard unleaded and I achieved the best mpg ever with that tankful. 33mpg overall. So, you pays your money and takes your choice!



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Post by scimjim » Tue May 12, 2020 9:11 am

All 2.9i colognes can use unleaded safely. They have an ECU, so should never pink, even on 95 RON - although there is an octane change function in the ECU with a plug in the loom to switch for lower rated fuel (I’m not sure if the Middlebridge loom has this?)

I had a 2.9i granada auto in the 90s, which did huge mileage (Belfast/Stranraer to Andover regularly) and always returned mid/high 30s mpg. Then I had the 2.9i 5 speed GTC in Germany which used to do 400 mile trips back to UK at 90-100 mph most of the way and returned mid/high 30s, then I had a 2.9i 4x4 Sierra 5 speed which didn’t do much mileage and nearly all urban, that managed low 30s generally - all were run on 95 RON supermarket fuel with occasional treats of 97/98 but there was no noticeable difference between the two. For a road car, I wouldn’t bother with the couple of BHP you may gain or the couple of additional mpg as the extra cost outweighs the advantages (present prices excepted!)


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Post by midscotscim » Tue May 12, 2020 8:34 pm

I have run my MB on 95, 97 and 99 with no issues or requiring the use of the octane adjustment plug. However, with the introduction of ethanol into modern fuel 97 would be my first choice. Most, if not all, petrol stations will be dispensing 95 with 10% ethanol (E10) and premium fuels 97 or 99 at 5% ethanol (E5). I don’t know what the long term effects of E10 fuel would be on a Middlebridge’s fuel system, so I will be sticking to E5.

Regards, Mark.


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scimjim
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Post by scimjim » Tue May 12, 2020 8:36 pm

I would say that E5 and E10 will accelerate degradation of the rubber fuel pipes at the least.


Jim King

SECURE DRY STORAGE FOR YOUR SCIMITAR

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Post by philhoward » Tue May 12, 2020 8:40 pm

The cynic in me says the Ford supplied bits of the fuel system will probably be fine - my concern would be anything else. Depends who MB bought their parts from.


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Post by drcdb15 » Tue May 12, 2020 11:15 pm

I've always used standard unleaded, never had any problems but then again I don't drive the car particularly hard. I think before I worry about the fuel I'd make sure the quick-connect on the fuel line in the engine bay is removed. Like many others before me, I ran the engine one day to find liquid spewing everywhere and clouds of vapour which fortunately did not ignite before I realised what was going on and got it all turned off. Many thanks to MESS and the website for alerting me in advance so I recognised what was happening. I simply cut out the connector and re-connected the hose, didn't even need to lengthen it at all, so it is still a mystery to me why this connector was ever used in the first place, it seems to me to be completely uneccesary. But at 30 years old it is definitely a safety hazard as it gets brittle with age and leaks - LOTS !


Chris
MB61; formerly 1978 SE6A 3.5 V8; 1986 SE6B 2.9 EFi.

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Post by giddo » Thu May 21, 2020 2:32 pm

Thanks to all the above replyers, Some useful info there for me.


Mike Giddens
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