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earlier 172's until about late '02 had the sport head casting, with larger exhaust ports which flow much better. THe later 172's and 182's/cups have a head based on the turbo casting, much smaller exhasut ports which flow about 20% less. The valves/cams/geometry is the same.
But cnc programs...
yea, they are balanced to a 120 deg pattern....BUT, the cranks are so long that torsional vibration is horrible and they twist alot, hence no super power ones are around, they cant deal with massive torque (before you bring in commercial, they follow diff rules ;) ) lol.
Technically a 4 pot...
Nope, no problems.
Majority of clubman rally racers use them......remoulds is misleading, they are approved for competition use.
They last well, grip well and cost next to nothing.
There is no direct relationship, its entirely upto what the manufacturer is aiming for.
Most cars now are classed in engine size, which affects target market and insurance ratings/tax/registration, so the have capacities groups to play into.
No point having a 2ltr v8 in a production car...
you'll be fine driving until the noise gets really bad.
No special tools unless your replacing the bearing.
No idea how much a garage will charge, depends on their labour rate.....about £80-100 average for labour i would say.
And you wont be able to proove they bent it, they will...
if you've got dedicated track wheels, then run some dedicated track rubber.
Some hard compound semi's or tarmac stage remoulds from colway are brilliants and not alot of money, plus they last ages.
buy either a new hub to ensure its perfect, but they aint cheap, or get a s/h one and take the risk (not many bend though as they are massive peices of cast iron, it took almost rolling the thing at goodwood to bend mine....and a hydraulic press to bend another.
Actually, they could of bent...
If a bearing keeps going then it probably means your hub is bent.
Mine kept going every 1500-2000 miles and i did about 3 bearings before getting a new hub on there. Still fine now.