EscortHeadCase Posted October 23, 2009 Report Posted October 23, 2009 Dads van has standard ones fitted but has 190bhp out of his pinto on a type 9. It came with a set of Quaife halfshafts to go in, but because hes running 13s and im on 15s hes saying that my standard (soon to be otherwise) pinto is going to be more likely to break them with all that extra wheel and rubber on the end of them and i think otherwise. What do you lot reckon?
mk1mexico Posted October 23, 2009 Report Posted October 23, 2009 Grip will break the shaft. Que Gary retro......
SmokeEm Posted October 23, 2009 Report Posted October 23, 2009 As above - nowt to do with power - All about Grip Cue Gary
EscortHeadCase Posted October 23, 2009 Author Report Posted October 23, 2009 Surely power is included in the equation, Whats more likely going to break standard shafts, 15x7 Compo MOs with standard power and torque on Yoko Avs Sports or 13x7 4spoke revos semi sticky road tyres and 190hp and ??? torque ? Whatever happens we are gonna end up with a set spare but not breaking any would be the best option. Because even though they aint strip machines, we all like a hard launch dont we
Admin Vista Posted October 23, 2009 Admin Report Posted October 23, 2009 Wheels don't provide grip, tyres do. What tyres do you have on each car?
Retromotorsport Posted October 23, 2009 Report Posted October 23, 2009 its a power to grip ratio problem .. too much power and not enough grip and the shafts have an easy life as the power overcomes the grip and just spins, a spinning wheel isnt gripping, hence why a cossie escort just sits there smoking ..yet a x-flow moves forward. Axle tramp comes into it too.. the wheels hop up and spin up then land and grip, which snatches on the shafts. A 13 inch wheel that has the same compound and same overall diameter as a low profile shod 15 inch wheel will have the same grip, A very low profile tyre on a 13 inch wheel has a smaller footprint that a large profile 15 inch wheel. Imagine the pattern left by a muddy football compared to a wet tennis ball .. one patch is the size of a saucer, the other the cup base. And 'semi sticky ' isnt very technical .. have a look around the the tyre for the wear rating ... the lower the number the more grip the tyre has
EscortHeadCase Posted October 23, 2009 Author Report Posted October 23, 2009 Hadnt seen the car in person until 5 minutes ago, ill have a look tomorrow at what footwear shes got on. Either that or ill just wait until one of them breaks a set of half shafts, and then give that one the quaife ones.....
Mick The Cabbie Posted October 23, 2009 Report Posted October 23, 2009 I broke a shaft without really trying at the Pod on Sunday. 160ish BHP Pinto, warmed slicks & standard open diff/english axle. I was really suprised how easily it broke! The car never moved an inch off the line..
James HPE Motorsport Posted October 23, 2009 Report Posted October 23, 2009 It can also depend on the shaft itself! say for instance you buy a set of shafts off ebay, they are unmarked so you dont know which side they come from, you have a 50% chance of getting them in the opposite way to what they were fitted before. All the stresses have been the same throughout their life, and then you put stresses in the opposite direction-more likely to fail! I would say that you are unlikely to break any halfshafts on the road full stop unless you are using super sticky cut slicks or you have a shed load of tramp (usually because tyre pressures are too high)! However, I would say that the 15's are more likely to snap the shafts! They will never break through normal use, just off the mark!
Retromotorsport Posted October 23, 2009 Report Posted October 23, 2009 One last piece of advice ... on the shafts when buying S/H, you can see what side they have been in by looking at the splines closely... the drive side of the splines will be worn slightly
James HPE Motorsport Posted October 23, 2009 Report Posted October 23, 2009 One last piece of advice ... on the shafts when buying S/H, you can see what side they have been in by looking at the splines closely... the drive side of the splines will be worn slightly Good tip!!!
you'll get 10s on that Posted October 24, 2009 Report Posted October 24, 2009 "A 13 inch wheel that has the same compound and same overall diameter as a low profile shod 15 inch wheel will have the same grip, A very low profile tyre on a 13 inch wheel has a smaller footprint that a large profile 15 inch wheel " is that entirelt true??? Surely the 13" diameter will give better grip off the line compared to the same width/compound/overall diameter 15" tyre due to the increased ability of the sidewall to deform rather than the trndancy of the 15" to spin????
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