4 degrees out....
Discussion
just left work for a brekkie run...got back and some workmates having a crafty cig see the security guard...
Mate - "Sounds nice that dunt it, pops like mad"
Security guard - "nah..well not too bad...4 degrees out, definately 4 degrees."
!!!!! Wonder if hes a proper mechanic - Hope not!!!!!
Mate - "Sounds nice that dunt it, pops like mad"
Security guard - "nah..well not too bad...4 degrees out, definately 4 degrees."
!!!!! Wonder if hes a proper mechanic - Hope not!!!!!
If you're wandering what he's on about with the '4 degrees out'...
Basically to produce peak power, the mechanical config is to have the peak cylinder pressure to occur at the same crank angle in all operating conditions...
Normally the angle is typical V8's is 15 to 20 degrees after TDC (top dead centre).
If its any earlier than that - you're losing power, lost due to rising cylinder pressure before TDC -
and a big risk of knock! (not good for the engine!)
But, any later than that, then the pressure front chases the piston down the bore instead of forcing it down.... But dont worry, AJP engines might be mechanically very simple, but the way its been set up, is how it produces the power, I'm sure if you were a techie and didnt give a toss about cost, you could really mess around this area and peak the power up to perfect levels by mapping and maybe (ideally) playing with the hardware too!...
Edited to say: I just wish I had the garage space and the tools and the time and the guts to play around... I used to back when I was living with the family (well, having uncles and cousins in the mechanics trade did help, I might have held a spanner or two... my cossie was tuned to perfection...)
>> Edited by SXS on Sunday 15th August 09:03
Basically to produce peak power, the mechanical config is to have the peak cylinder pressure to occur at the same crank angle in all operating conditions...
Normally the angle is typical V8's is 15 to 20 degrees after TDC (top dead centre).
If its any earlier than that - you're losing power, lost due to rising cylinder pressure before TDC -
and a big risk of knock! (not good for the engine!) But, any later than that, then the pressure front chases the piston down the bore instead of forcing it down.... But dont worry, AJP engines might be mechanically very simple, but the way its been set up, is how it produces the power, I'm sure if you were a techie and didnt give a toss about cost, you could really mess around this area and peak the power up to perfect levels by mapping and maybe (ideally) playing with the hardware too!...
Edited to say: I just wish I had the garage space and the tools and the time and the guts to play around... I used to back when I was living with the family (well, having uncles and cousins in the mechanics trade did help, I might have held a spanner or two... my cossie was tuned to perfection...)
>> Edited by SXS on Sunday 15th August 09:03
I am not totally inept when it comes to mechanics....changed a head on My old Uno Turbo,ran like a pig after though - timing was way out...not sure why! (well i do -i made a mess of it!) but.........I wouldnt touch the TVR.
Mind u, i couldnt afford to have a specialist sort the Uno - that was my motivation!
cheers for the info though.......
Mind u, i couldnt afford to have a specialist sort the Uno - that was my motivation!
cheers for the info though.......
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