44 replies to this topic

[enderwigginau]

Tell me all aboutt Compression, also cna you advise why all the low compression engines where sent oversea's (presume NZ and PNG)

Low Compression Export Engines -

The average RON of fuel outside most developed countries was 70 octane.
That meant that in the middle east you may be running something substantially lower.

The higher the compression, the better quality the fuel required - for example, current high performance cars require premium (98+ octane) fuel as a minimum.

Grant..

[FastEHHolden]

Q. Is air pushed or sucked into a carburetor?

A. With the exception of forced induction systems (centrifugal supercharger, or turbocharger - where air is forced through the carburetor), air is drawn through the carburetor (sucked) by the engine's vacuum signal. The amount of air is determined by the strength of the vacuum signal.


Don't want to be pedantic....but that isn't correct.....the atmoshere pushes that air in there....nothing sucks

[TerrA LX]

^ how would a vacuum gauge work on the intake manifold and for that reason the brake booster then?

[enderwigginau]

Air moves from high pressure to low - given.

If you create a low pressure - then you suck air toward it.
If you create a high pressure - the air is blown away.

Engine creates low pressure.
Carbies suck.
QED

[76lxhatch]

That is a little pedantic, same as saying that there is no such thing as cold

[FastEHHolden]

I know it challeges the norm....but its the the weight of the atmoshere that pushes the air in all those situations....and cold is just an absence of heat....that is to say something that is cold does not posses as much heat as something that is hot.

But I see the aim of this thread too

[76lxhatch]

Yep all true just saying that for practical purposes there's nothing wrong with using the word 'suck'

[enderwigginau]

[ls2lxhatch]

It is a standard question on an mechanical aptitude test.

http://www.gmh-toran...showtopic=22535

http://www.forddocto...anicalAptitude/

Edited by ls2lxhatch, 04 December 2008 - 01:25 AM.

[rodomo]

Heavy duty triple everything type clutch

http://www.gmh-toran...mp;#entry366178

http://www.gmh-toran...showtopic=32814

[rodomo]

Didnt some of th L34 race cars use panhard rods as stated in Australian Muscle Car magazine page 49 there is a picture of one.

There are pictures here too if you look hard enough

Found em:
http://www.gmh-toran.......&hl=panhard

Edited by rodomo, 31 January 2009 - 10:31 PM.

[Heath]

The 'deck' (face where the head bolts against) gets machined down, reducing the 'deck height'. Ups the compression without altering the head (so if you want a head that is not dedicated to high compression motors but the block is expendable), but obviously it doesn't work if your pistons are gonna hang out the top

[surfmaster]

What does 'Decking' an engine do???

Cheers,
Brett

It also removes the engine number from 253 and 308 blocks!!!!!

[TerrA LX]

The 'deck' (face where the head bolts against) gets machined down, reducing the 'deck height'. Ups the compression without altering the head (so if you want a head that is not dedicated to high compression motors but the block is expendable), but obviously it doesn't work if your pistons are gonna hang out the top

Is also used to alter the piston top dead centre to deck height.

Example, if you stroke a motor and the new pistons are too far down the bores at top dead centre.