Vortech Toothed Belt Tension
Discussion
I've been doing some tests and spoke to Capa and have a conclusion to the tension that it should be set at, I'm using a crank drive system. Capa said not to rev the car over 2,500rpm until at full temperature, which is the clue. They also said to set the belt up when at this temperature with about an inch of play. So the result it that when the engine is cold the belt is very loose, it looks too loose and feels to loose too but when it's hot the tension is about an inch. Not had any problems yet and if some one want's to host and post some videos then I will take them hot and cold to show you.
delmeekc said:
I've been doing some tests and spoke to Capa and have a conclusion to the tension that it should be set at, I'm using a crank drive system. Capa said not to rev the car over 2,500rpm until at full temperature, which is the clue. They also said to set the belt up when at this temperature with about an inch of play. So the result it that when the engine is cold the belt is very loose, it looks too loose and feels to loose too but when it's hot the tension is about an inch. Not had any problems yet and if some one want's to host and post some videos then I will take them hot and cold to show you.
Well im not sure there alot you can do. But i would have thought the belt would be looser when its hot. Because most things expand when hot and contract when cold.
But aslong as it the correct tension when hot thats the main thing i think.
Because the SC is at the top and the belt is running from the crank maybe theres a idler pulley you and fit some how to stop the belt slap when its loose. maybe......
I know someone else will be along in a min and comment more.....
essexhsv said:
Well im not sure there alot you can do. But i would have thought the belt would be looser when its hot. Because most things expand when hot and contract when cold.
How could it possibly get looser ? the engine etc expands when hot, increasing the distance between pulleys.Although from the talk mentioned, it seems to expand an unbelievable amount ??
I will do the videos the weekend if I get a chance and stick them on youtube with links. The Capa instructions make sense and works, it's does not skip when loose at all, it looks fine but I always warm it up driving with little throttle until its right up to temperature around 190-194.
stevieturbo said:
essexhsv said:
Well im not sure there alot you can do. But i would have thought the belt would be looser when its hot. Because most things expand when hot and contract when cold.
How could it possibly get looser ? the engine etc expands when hot, increasing the distance between pulleys.
Although from the talk mentioned, it seems to expand an unbelievable amount ??
Steve, i was only referring to the belt stretching and getting looser when hot, i forgot about the engine expanding lol
But after see the videos as you say, they are a good tention when hot, very strange............
It's on the instructions and I called Capa to confirm, if you set the belt tension up tight cold then as the brackets, engine etc expand due to heat the bracket will bend forwards and then the belt will ride off the front of the sc toothed pulley, did that one over christmas. As soon as it touches the outside lip of the tensioner it's off. The belt seems to guided by the crank pulley. If the belt is over stretched the teeth come off, done that too. I got myself a few spare belts in the boot and got them direct from the manufacturer. The expansion is not over what it should be, how hot does the block get and the belt is 1.584m in length.
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