The V8 Owners Forum -

anyone know if ali cylinders usually have a steel liner? as in clutch/brakes cylinders?


Ralph

Normally not to the best of my knowledge, but if yours has then it may have been relinered.

im making a new light weight ali one, i dont think im gonna bother at least not to begin with an see how it lasts.

pic here at the bottom....

http://www.metropower.org.uk/forum/foru ... 48#M566910

wish this site hosted pics.....


Ralph

Come on Ralph- you're worried about saving 50grams on a clutch cylinder but you still have a bloody great lead acid battery in there?! Get a gel one, theres about a 10kg saving to be had there and half the size! And you dont need a proper air box just fit a big K&N and a 0.8mm ally heat shield around it from the engine.

more like 1/4 of a KG!

you find me a sealed battery an i will buy it, but it needs to be one which will last as car gets used everyday. most sealed ones are designed to be run flat then charged up an wouldnt survive long in a car, bloke at the battery center thought the 44AH one was to small really, but works fine!

that air box is plastic so weighs next to nothing, an i need a cold air feed as engines in the back, so cone filter is no good.


Ralph

Ralphh85 wrote:more like 1/4 of a KG!

you find me a sealed battery an i will buy it, but it needs to be one which will last as car gets used everyday. most sealed ones are designed to be run flat then charged up an wouldnt survive long in a car, bloke at the battery center thought the 44AH one was to small really, but works fine!

that air box is plastic so weighs next to nothing, an i need a cold air feed as engines in the back, so cone filter is no good.


Ralph

Genuine SLA (gel) lead acid batteries ain't 'designed to be run flat' - they are used in burglar alarms and UPS etc where they may never actually be used in anger, but stay on a float charge. No lead acid types actually like being run flat - it shortens their life. But some cope better than others. SLA also require a different type of charging, so aren't a direct substitution for a car type.
To really save weight without penalty you'd have to go to Lithium Ion - but cost is excessive.

Ralphh85 wrote:more like 1/4 of a KG!

you find me a sealed battery an i will buy it, but it needs to be one which will last as car gets used everyday. most sealed ones are designed to be run flat then charged up an wouldnt survive long in a car, bloke at the battery center thought the 44AH one was to small really, but works fine!

that air box is plastic so weighs next to nothing, an i need a cold air feed as engines in the back, so cone filter is no good.


Ralph

Genuine SLA (gel) lead acid batteries ain't 'designed to be run flat' - they are used in burglar alarms and UPS etc where they may never actually be used in anger, but stay on a float charge. No lead acid types actually like being run flat - it shortens their life. But some cope better than others. SLA also require a different type of charging, so aren't a direct substitution for a car type.
To really save weight without penalty you'd have to go to Lithium Ion - but cost is excessive.

so untill i can afford a li-ion one then i may aswell stick to a small car battery?

guessing li-ion are 100's of pounds?


Ralph

http://www.optimabattery.co.uk/english_ ... optima.htm

Not cheap, but all of the serious off-road boys I know use them and yellow tops for winches, not a racing gel type but will last for years and perform like a normal battery.

topcatproduction wrote:http://www.optimabattery.co.uk/english_ ... optima.htm

Not cheap, but all of the serious off-road boys I know use them and yellow tops for winches, not a racing gel type but will last for years and perform like a normal battery.

I use one in my Cobra rep, it spins up my 4.6 lump even if it has been parked up for ages.

i think they are heavier than my normal battery?


Ralph

Because of the fact that SpiralCell technology can store more energy for a given size of battery, these types of battery are ideal for use in motor sport because a much larger "conventional" battery would need to be used in place of an OPTIMA to give the same starting current capability. And they don't leak, corrode, spill, have very low self discharge rates, and can be mounted any way up!

Basically you can use a smaller red top than normal lead acid...

there smallest 12v battery is heavier than an 063 car battery which i think is about 12kg.


Ralph

topcatproduction wrote:http://www.optimabattery.co.uk/english_ ... optima.htm

Not cheap, but all of the serious off-road boys I know use them and yellow tops for winches, not a racing gel type but will last for years and perform like a normal battery.

I'd be more interested in them if they put their money where their mouth is and gave a longer warranty than normal lead acid types. My feeling is they are somewhat of a 'designer' battery. If they really were that much better for general use, the likes of Rolls Royce and Ferrari would fit them as standard. But I am an Aberdonian by birth.

I only know how good they seem as everyone who is serious about off roading I know has them- even at £200 a pop!