What's so special about Valvoline VR1?

[Staggard]

So in order to use 99 octane ( more expensive) we need to retune the engine by over advancing the ign timing beyond standard figures. In fairness the Stag engine in its standard form is hardly high performance. Be better to stick in 95 as it was designed to run on and retune/reset the ign timing to standard. All things being equal it will probably go as well or better.Graham

[stagmyson]

Haven't changed my oil yet.
How many ltrs do our stags take

[StagJonno]

Well thanks guys, you've informed and convinced me.

I've now placed an order with Europarts for the VR1 (only used the "extra15" code, so possibly missed out on the additional SOC 5%) - ah well - I'm still happy. From this year's experience, the only time I've not used ny Stag for a long period was last winter, so the "magnetic" feature may not be too important.

Can I just drain the old Magnatec and fill with VR1, or is a flush mandatory? Can I use my remaining Magnatec to top up the VR1?

Thanks also for the feedback on lead-replacement - I'll pass on that in future and stick with the Shell V Nitro+ and may see if I can get some further benefit from advancing a bit - downside is that occassionally finding this hard to come by.

All the best

Jonno

[Staggard]

Haven't changed my oil yet.
How many ltrs do our stags take

Around 5 with the filter

[DJT]

95-octane supermarket unleaded since 1992. Does it for me with 139BHP on a rolling road with a standard setup.

[HersnotHis]

So in order to use 99 octane ( more expensive) we need to retune the engine by over advancing the ign timing beyond standard figures. In fairness the Stag engine in its standard form is hardly high performance. Be better to stick in 95 as it was designed to run on and retune/reset the ign timing to standard. All things being equal it will probably go as well or better.Graham

My handbook says 97 octane - British 4 Star rating (which IIRC was 98 octane)

H

[Staggard]

My handbook says trust the knowledge and experience of owners and mechanics that have been working on these cars for over 40 years. As always Aitch you do whatever you want with your own car and of course you are entitled to your own opinion. But with the greatest respect and as I understand it you have only owned the car for a year and have never worked on it, So to disagree with flying farmer (Neil) not to mention DJT who both have a long track record with these cars and are stating facts a little demeaning. Anyway |I am going to start running mine with nitrous oxide I don't want you going faster than me Slow and frustrated heading towards fast and furious

[V Mad]

If you are comparing regular and super without considering the ignition timing, then I don't see the point. If your timing is set for regular (retarded) then filling up with super will not improve performance. But if the timing is set for super (advanced) then you should notice the difference. Only cars with knock sensors can automatically take advantage of fuel with different RONs.

[marshman]

There are also variations between engines. Some are original, not rebored, heads not skimmed etc. Others will have over sized pistons due to rebores and have higher compression ratios due to skimming of the heads. I would think any Stag engine can be made to run nicely on either type of fuel if the carbs and ignition timing are set up for it, (and the engine is not worn out!), but as Chris says you can't simply change fuels and expect any advantage and if the engine has been set up to run on the premium fuel then putting in the other stuff will probably make the performance suffer. In terms of if the expensive stuff is worth it probably depends on the car, the setup and what you want. As always if you are happy with what you are doing with your car then fine, if someone is doing something different then it doesn't necessarily mean that they, or you, are wrong.

Roger

[HersnotHis]

My handbook says trust the knowledge and experience of owners and mechanics that have been working on these cars for over 40 years. As always Aitch you do whatever you want with your own car and of course you are entitled to your own opinion. But with the greatest respect and as I understand it you have only owned the car for a year and have never worked on it, So to disagree with flying farmer (Neil) not to mention DJT who both have a long track record with these cars and are stating facts a little demeaning. Anyway |I am going to start running mine with nitrous oxide I don't want you going faster than me Slow and frustrated heading towards fast and furious

Despite only having had the Stag for a year I have done a large number of small jobs on it. I have however owned classsic cars on and off for over 20 years and in that time have done several major items on other cars. (and also did so in my late teens and twenties)

If the original Stag documentation says 97 octane/4star then that was what it was designed to run on. I use 99 octane as the PO had used this for the entire period of his ownership (6 yr) and said he was advised to use this by the place he got the car serviced. I stick with super -unleaded also because of the zero ethanol content, this is becoming more important as I beleive the ethanol content of standard unleaded is being increased .

Whatever the Stag runs beautifully and goes like the proverbial.

I hope you dont try to run your Stag on Nitrous Oxide as you will never stop laughing!

H

[Staggard]

Despite only having had the Stag for a year I have done a large number of small jobs on it. I have however owned classsic cars on and off for over 20 years and in that time have done several major items on other cars. (and also did so in my late teens and twenties)

If the original Stag documentation says 97 octane/4star then that was what it was designed to run on. I use 99 octane as the PO had used this for the entire period of his ownership (6 yr) and said he was advised to use this by the place he got the car serviced. I stick with super -unleaded also because of the zero ethanol content, this is becoming more important as I beleive the ethanol content of standard unleaded is being increased .

Whatever the Stag runs beautifully and goes like the proverbial.

I hope you dont try to run your Stag on Nitrous Oxide as you will never stop laughing!

H

graphics-laughing-867787[1].gif

https://youtu.be/jPks09qDXkQ

[jagorstag]

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https://youtu.be/jPks09qDXkQ

Fantastic!!

[HersnotHis]

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https://youtu.be/jPks09qDXkQ

Amazing must watch more old Top Gear episodes! Your little guy looks like he has been breathing the stuff anway!

Question - if objective was to increase oxygen content in combustion mix why not just bleed in straight Oxygen?

H

[susiedeer]

[ATTACH=CONFIG]35005[/ATTACH]

https://youtu.be/jPks09qDXkQ

The dog's danglies!! 'nuf said (except it want more characters so now enough) and it want more characters, as they say in the east of the med, enough already!
!cid_20_2377536810@web172802_mail_ir2_yahoo.gif

[marshman]

Question - if objective was to increase oxygen content in combustion mix why not just bleed in straight Oxygen?

H

You could but it's all to do with keeping it simple. Nitrous Oxide can be stored as a liquid easily, at 800 psi (approx) it liquefies. So a small bottle can hold a lot of oxygen. Also the pressure stays constant as the liquid boils to produce the gas so the injection system is easy to design as it does not have to cope with a varying pressure, a nearly empty bottle still has 800psi while ever there is still some liquid nitrous in there. Pure oxygen (O2) cannot be compressed into a liquid, it needs to be cooled - really cooled - which is impractical in a car - OK for NASA though. So even a large cylinder at 3000psi contains very little oxygen compared to a small bottle of Nitrous oxide.

Roger