Unleaded Fuel - General Enquiry
- Thread starter RAW400
- Start date
Hi
Early V8's have high compression engines so are fussier but despite this, mine runs fine on ordinary unleaded. Have started to use an additive as a precaution and went for one with an octane boost as they were designed for 100 octane but I'm not sure it is worth paying the extra for the boost as it ran fine on neat stuff.
I've already found out that suitable fuels are good grounds for debate!! This is true in other car clubs too.
Ian
Early V8's have high compression engines so are fussier but despite this, mine runs fine on ordinary unleaded. Have started to use an additive as a precaution and went for one with an octane boost as they were designed for 100 octane but I'm not sure it is worth paying the extra for the boost as it ran fine on neat stuff.
I've already found out that suitable fuels are good grounds for debate!! This is true in other car clubs too.
Ian
rovermorris999
New Member
P6s don't need lead for wear protection but they do need the octane it provides. Detune by 2 degrees to 4 degrees BTDC and use Shell Optimax or BP Ultimate. It'll be fine. Or detune to 0 degrees BTDC and use ordinary unleaded.
Phil Robson
Well-Known Member
Hi,
I can only agree with you all - my high compression V8S has done over 27,000 miles on neat unleaded with timing retarded (to TDC I think).
No problems so far!
Phil (East Yorks RO)
I can only agree with you all - my high compression V8S has done over 27,000 miles on neat unleaded with timing retarded (to TDC I think).
No problems so far!
Phil (East Yorks RO)
MartinLewis
New Member
Sorry to be a bit slow on the uptake rovermorris, but how do you 'detune' the engine ?
I'm getting a P6B V8 auto in a couple of weeks and was looking around the forum to see if they run on unleaded or not. I currently run a Mondeo (on unleaded) and some older classic Mini's (on Optimax plus millers lead additive).
Any advice would be much appreciated. Thanks
I'm getting a P6B V8 auto in a couple of weeks and was looking around the forum to see if they run on unleaded or not. I currently run a Mondeo (on unleaded) and some older classic Mini's (on Optimax plus millers lead additive).
Any advice would be much appreciated. Thanks
If you want to set the timing to TDC - 0 degrees.......
Turn the bottom pulley with a socket until the main mark upon it lines up with the pointer on the engine. The engine is then at TDC. (No 1 piston at the very top of its compression stroke).
Take the distributor cap off and place a test lamp between the live side of the points (the only wire) and earth on the car.
Undo the clamp on the dizzy and rotate it back and forth - ONLY A LITTLE - until the light goes out/comes on. Move the dizzy until you are at the point where the light is switching on & off, and flickers as you nudge the rotor arm with your finger.
The timing is now set at TDC for unleaded!!
Easy as that (if you know what your doing)!
Johnny.
Turn the bottom pulley with a socket until the main mark upon it lines up with the pointer on the engine. The engine is then at TDC. (No 1 piston at the very top of its compression stroke).
Take the distributor cap off and place a test lamp between the live side of the points (the only wire) and earth on the car.
Undo the clamp on the dizzy and rotate it back and forth - ONLY A LITTLE - until the light goes out/comes on. Move the dizzy until you are at the point where the light is switching on & off, and flickers as you nudge the rotor arm with your finger.
The timing is now set at TDC for unleaded!!
Easy as that (if you know what your doing)!
Johnny.
MartinLewis
New Member
"Easy as that" - I hope so !
Thanks for your help mate
Thanks for your help mate
rovermorris999
New Member
Or use a timing light. They're pretty cheap to buy but get one with an inductive pickup and a nice bright xenon bulb.