'65 4.2 vs unleaded?
#1 '65 4.2 vs unleaded?
Would a '65 4.2 be unleaded compatible? My guess is NO?
Best Regards
Philip
Jag: 72 S3 XKE, 74 S3 XKE OTS, 80 XJS (Megasquirt + 5sp manual O/D)
Jensen: 74 Interceptor (EFI by Megasquirt + O/D 4sp auto)
Chev: 59 Apache std, 70 C10 (350V8, 700R4)
Philip
Jag: 72 S3 XKE, 74 S3 XKE OTS, 80 XJS (Megasquirt + 5sp manual O/D)
Jensen: 74 Interceptor (EFI by Megasquirt + O/D 4sp auto)
Chev: 59 Apache std, 70 C10 (350V8, 700R4)
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#2 Re: '65 4.2 vs unleaded?
All XK engines had alloy heads with hardened valve seats so compatible with unleaded fuel. Try to use the highest octane you can find for best performance. Shell V Power or BP Ultimate.
David Jones
S1 OTS OSB; S1 FHC ODB
1997 Porsche 911 Guards Red
Add your E-Type to our World Map: http://forum.etypeuk.com/viewtopic.php?f=1&t=1810
S1 OTS OSB; S1 FHC ODB
1997 Porsche 911 Guards Red
Add your E-Type to our World Map: http://forum.etypeuk.com/viewtopic.php?f=1&t=1810
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#3 Re: '65 4.2 vs unleaded?
That's good news!! However, surely the octane to be used depends on the compression ratio of the engine? How would I find out what the CR is on this '65 4.2?
Best Regards
Philip
Jag: 72 S3 XKE, 74 S3 XKE OTS, 80 XJS (Megasquirt + 5sp manual O/D)
Jensen: 74 Interceptor (EFI by Megasquirt + O/D 4sp auto)
Chev: 59 Apache std, 70 C10 (350V8, 700R4)
Philip
Jag: 72 S3 XKE, 74 S3 XKE OTS, 80 XJS (Megasquirt + 5sp manual O/D)
Jensen: 74 Interceptor (EFI by Megasquirt + O/D 4sp auto)
Chev: 59 Apache std, 70 C10 (350V8, 700R4)
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#4 Re: '65 4.2 vs unleaded?
Cylinder head is stamped with engine number with a suffix determining whether it is 8:1 (-8) or 9:1 (-9). In the day the 9:1 was expecting 5 Star petrol (100 octane) whilst the 8:1 was expecting 4 Star (97 octane). Given most super-unleaded fuels are 97 octane (and ethanol free or less than 5% ethanol) that is the one to use almost exclusively. You can use lower octane but expect problems from ethanol and lowered performance, and increased fuel consumption.
David Jones
S1 OTS OSB; S1 FHC ODB
1997 Porsche 911 Guards Red
Add your E-Type to our World Map: http://forum.etypeuk.com/viewtopic.php?f=1&t=1810
S1 OTS OSB; S1 FHC ODB
1997 Porsche 911 Guards Red
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#5 Re: '65 4.2 vs unleaded?
And tell him to use Castrol Valvemaster additive.
Frank
1963 3.8 FHC
1963 3.8 FHC
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#6 Re: '65 4.2 vs unleaded?
Given David's statement, why do your recommend that Frank?
Best Regards
Philip
Jag: 72 S3 XKE, 74 S3 XKE OTS, 80 XJS (Megasquirt + 5sp manual O/D)
Jensen: 74 Interceptor (EFI by Megasquirt + O/D 4sp auto)
Chev: 59 Apache std, 70 C10 (350V8, 700R4)
Philip
Jag: 72 S3 XKE, 74 S3 XKE OTS, 80 XJS (Megasquirt + 5sp manual O/D)
Jensen: 74 Interceptor (EFI by Megasquirt + O/D 4sp auto)
Chev: 59 Apache std, 70 C10 (350V8, 700R4)
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#7 Re: '65 4.2 vs unleaded?
Coz it still helps for valves designed for leaded fuel, especially where the best we can get is 95 Octane.
Frank
1963 3.8 FHC
1963 3.8 FHC
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#8 Re: '65 4.2 vs unleaded?
The additive won't make any difference to the valves ability to run with unleaded but it will increase the octane rating of the fuel which could be a bonus.
David Jones
S1 OTS OSB; S1 FHC ODB
1997 Porsche 911 Guards Red
Add your E-Type to our World Map: http://forum.etypeuk.com/viewtopic.php?f=1&t=1810
S1 OTS OSB; S1 FHC ODB
1997 Porsche 911 Guards Red
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#9 Re: '65 4.2 vs unleaded?
By how much will it increase the octane rating David? Is the increase really meaningful from say, 95 to 98 or is it more academic from 95 to 95.2?
Best Regards
Philip
Jag: 72 S3 XKE, 74 S3 XKE OTS, 80 XJS (Megasquirt + 5sp manual O/D)
Jensen: 74 Interceptor (EFI by Megasquirt + O/D 4sp auto)
Chev: 59 Apache std, 70 C10 (350V8, 700R4)
Philip
Jag: 72 S3 XKE, 74 S3 XKE OTS, 80 XJS (Megasquirt + 5sp manual O/D)
Jensen: 74 Interceptor (EFI by Megasquirt + O/D 4sp auto)
Chev: 59 Apache std, 70 C10 (350V8, 700R4)
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#10 Re: '65 4.2 vs unleaded?
Depends on what it is composed of but typically the improvement can be 0.2 RON ranging up to 3 RON: http://www.fuelexpert.co.za/Octane-Booster-Shootout.php
Only time we need it in Europe is when driving into Italy. Once you are off the Autostrada's the fuel is poor quality and don't be conned by the 'Super' label on the pump.
Only time we need it in Europe is when driving into Italy. Once you are off the Autostrada's the fuel is poor quality and don't be conned by the 'Super' label on the pump.
David Jones
S1 OTS OSB; S1 FHC ODB
1997 Porsche 911 Guards Red
Add your E-Type to our World Map: http://forum.etypeuk.com/viewtopic.php?f=1&t=1810
S1 OTS OSB; S1 FHC ODB
1997 Porsche 911 Guards Red
Add your E-Type to our World Map: http://forum.etypeuk.com/viewtopic.php?f=1&t=1810
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