speedyxjs
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| posted on 15/7/08 at 07:25 PM |
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Leaded and unleaded (may sound stupid)
This has confused me. I ordered a reprinted manual for my new old mg midget and it says it should be filled up with 97 RON 4 star.
Can i run it on 97 RON unleaded?
[Edited on 15-7-08 by speedyxjs]
How long can i resist the temptation to drop a V8 in?
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Mr Whippy
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| posted on 15/7/08 at 07:28 PM |
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yes its the same, it will be fine.
Fame is when your old car is plastered all over the internet
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neilj37
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| posted on 15/7/08 at 07:32 PM |
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97 RON is super unleaded rather than the regular unleaded which is 91 RON
[Edited on 15/7/08 by neilj37]
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Howlor
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| posted on 15/7/08 at 07:34 PM |
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The only difference I presume is that you will burn through the valve seats without the lead additive.
Steve
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mr henderson
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| posted on 15/7/08 at 07:35 PM |
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quote:
Originally posted by speedyxjs
This has confused me. I ordered a reprinted manual for my new old mg midget and it says it should be filled up with 97 RON 4 star.
Can i run it on 97 RON unleaded?
Only if you don't mind the valve seats getting all f*cked up. You need to get harder valve seats fitted
John
Damn it, must type faster
[Edited on 15/7/08 by mr henderson]
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speedyxjs
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| posted on 15/7/08 at 07:37 PM |
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quote:
Originally posted by Howlor
The only difference I presume is that you will burn through the valve seats without the lead additive.
Steve
thats what i thought. I meant to add without adding additive
How long can i resist the temptation to drop a V8 in?
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blakep82
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| posted on 15/7/08 at 07:43 PM |
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i heard years ago that old engines that were running leaded petrol for years and years were ok to run unleaded for a while as they built up enough
lead deposit in the fuel system to be safe, but how long for (and if its true) i don't know.
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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Howlor
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| posted on 15/7/08 at 07:56 PM |
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There are those things you drop in the tank that are supposed to do the same job as the lead.
Steve
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trogdor
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| posted on 15/7/08 at 07:57 PM |
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if you keep the revs down and don't do many miles you will prob get away with it.
But i think this is going to be your daily driver?
You can buy lead additives that will help but you prob be better getting the heads modified.
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GeorgeM
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| posted on 15/7/08 at 07:58 PM |
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I run my frogeye on unleaded with an additive.
Other solution is a metro head
GeorgeM
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rusty nuts
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| posted on 15/7/08 at 08:13 PM |
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Other solution is a metro head
GeorgeM
1500 ?? IIRC So Metro head is no good?
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DRC INDY 7
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| posted on 15/7/08 at 08:21 PM |
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castrol valvemaster + and it does work ive used it for years in many a classic car
plus i will be useing it in my indy
https://www.facebook.com/groups/462610273778799/
Puddle Dodgers Club
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mr henderson
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| posted on 15/7/08 at 08:22 PM |
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quote:
Originally posted by rusty nuts
Other solution is a metro head
GeorgeM
1500 ?? IIRC So Metro head is no good?
1275 Metro
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iank
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| posted on 15/7/08 at 08:30 PM |
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Midget had two engines during its life
1961-1974 Chrome bumpers had A-series in 948, 1098 or 1275cc
1974-1980 Rubber bumpers had a 1500 Triumph spitfire engine (complete with chocolate crank).
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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rusty nuts
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| posted on 15/7/08 at 09:09 PM |
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quote:
Originally posted by mr henderson
quote:
Originally posted by rusty nuts
Other solution is a metro head
GeorgeM
1500 ?? IIRC So Metro head is no good?
1275 Metro
Rubber bumper Midgets were NEVER fitted with the A series engine so a 1275 Metro head will not fit. Uses the same engine as the Triumph Spitfire
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dhutch
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| posted on 15/7/08 at 09:13 PM |
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quote:
Originally posted by trogdor
You can buy lead additives that will help but you prob be better getting the heads modified.
Dont know anything about other engines, but in landrover circles the consensus seams to be to run it with a splash of addative, which will proberbly
be fine. And if its not then the valve seated needed doing anyway!
Daniel
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britishtrident
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| posted on 15/7/08 at 09:17 PM |
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quote:
Originally posted by blakep82
i heard years ago that old engines that were running leaded petrol for years and years were ok to run unleaded for a while as they built up enough
lead deposit in the fuel system to be safe, but how long for (and if its true) i don't know.
Yes in the short term -- but this engine is likely to have used up all its leaded memory effect years ago.
Also if it is a 1275 A engine they are notorious for burning exhaust valves in the centre pair of cylinders.
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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britishtrident
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| posted on 15/7/08 at 09:23 PM |
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quote:
Originally posted by trogdor
if you keep the revs down and don't do many miles you will prob get away with it.
But i think this is going to be your daily driver?
You can buy lead additives that will help but you prob be better getting the heads modified.
Nothing to do with revs but a lot to do with the end gas temperature in the cylinder --- ie wide throttle opening. Also a weak mixture or
retarded timing will overheat the valves.
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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britishtrident
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| posted on 15/7/08 at 09:24 PM |
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quote:
Originally posted by Howlor
There are those things you drop in the tank that are supposed to do the same job as the lead.
Steve
No the only good they do is to the sellers bank balance.
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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britishtrident
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| posted on 15/7/08 at 09:29 PM |
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quote:
Originally posted by rusty nuts
quote:
Originally posted by mr henderson
quote:
Originally posted by rusty nuts
Other solution is a metro head
GeorgeM
1500 ?? IIRC So Metro head is no good?
1275 Metro
Rubber bumper Midgets were NEVER fitted with the A series engine so a 1275 Metro head will not fit. Uses the same engine as the Triumph Spitfire
True Never factory fitted --- a lot have been fitted with ex-Marina engines over the years.
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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Fatgadget
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| posted on 15/7/08 at 09:48 PM |
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Out of interest has anyone actually experienced burnt out valve seats first hand through running low ron fuel?
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andyps
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| posted on 15/7/08 at 10:42 PM |
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quote:
Originally posted by Fatgadget
Out of interest has anyone actually experienced burnt out valve seats first hand through running low ron fuel?
It isn't the RON which is the problem for valve seat recession, it is the lead. Shell Optimax or Tesco 99 will still get recesssion in a car
designed for lead. The lower RON will just mean it may pink under load and won't develop as much power as it should.
The Castrol lead additive is very cheap in overall terms and worth using as LRP is becoming very hard to get hold of now. Don't know how much
genuine 4 star is if you happen to find somewhere selling it.
If running unleaded when it should be leaded the important thing is to avoid steady throttle openings for prolonged periods - that is what burns the
seats away so motorway runs are the worst.
Andy
An expert is someone who knows more and more about less and less
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Paul TigerB6
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| posted on 16/7/08 at 12:16 AM |
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quote:
Originally posted by DRC INDY 7
castrol valvemaster + and it does work ive used it for years in many a classic car
plus i will be useing it in my indy
It better had work - otherwise i spent 4 months wasting my time evaluating the production process for production over here for the UK market!!! 
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smart51
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| posted on 16/7/08 at 07:02 AM |
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quote:
Originally posted by neilj37
97 RON is super unleaded rather than the regular unleaded which is 91 RON
The lowest grade sold in the UK is 95 RON.
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speedyxjs
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| posted on 16/7/08 at 07:03 AM |
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Cheers guys 
Iv got some castrol valvemaster and used that when i came back after picking it up so il just keep using that.
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