Video Thumper 2 Tractor Pull The Thumper 2 goes tractor pulling with two V12 Allison engines at 1700CI each. Advertisement ByEngine Builder on Jun 11, 2015 AdvertisementClick Here to Read MoreAdvertisement Advertisement In this article:Allison V12 Engines, Thumper 2, Tractor Pulling Video: Intellectual Horsepower – Ep. 2 Video: 8 Things Your Diesel Oil is Telling You Video: The Science of Speed in Motorcycle Drag Racing Video: How to Split Motorcycle Engine Cases Advertisement VIDEOS Watch Engine Builder's latest discussions and explanations. SHOP Shop the latest Engine Builder merchandise. SUBSCRIBE Stay up to date by signing up for the Engine Builder newsletter.