🔧 ProForm 66835: Maximize Engine Performance with Mini Valve Spring Tester Review

I'm glad I invested in this little tool, I've used it against several different cylinder head springs and it's interesting, the closed valve spring to see as well as valve opening/full stroke rate of old and new springs. I would buy this again

Good for the price. Not something I would buy from a mechanical shop for everyday use, but fine for my use and level of precision. If I need more precision, I take my springs to a mechanical shop. I recommend this product for such an environment.

I tested this with my own weight and a set of new springs. It seems to be between 100 and 200 pounds within 5 pounds. I clamped it in a vise on my grinder and used an old jack with a 3/4" collet to push the spring down. The QI scale on the spring and stopper makes the whole setup as good as a professional spring tester .

I'm glad I invested in this little tool, I've used it against several different cylinder head springs and it's interesting, the closed valve spring rate as well as the open/full one Raise the valve to see force of old and new springs. I would buy this again

Good for the price. Not something I would buy from a mechanical shop for everyday use, but fine for my use and level of precision. If I need more precision, I take my springs to a mechanical shop. I recommend this product for such an environment.

I tested it with my own weight and a set of new springs. It seems to be between 100 and 200 pounds within 5 pounds. I mounted it in a vise on my grinder and used an old 3/4" collet jack to push the spring down. The scale and stop on the spring make the whole setup work almost as well as a professional spring tester.