Engine SetBack Information
I run a steel dart block with aluminum heads and have had the same car for 2 years. I just recently found out what the setback on the engine is. It is 5 inches from center of ball joint to front spark plug. My rules allow this measurement to be 10 inches. I have talked with some drivers around my area and they all hav it 8 to 10 inches. I would like some explanation on how this is affecting the car. steering and traction???
I am thinking of moving this back. My car is built to be 5 inches. So i need to do some modifying to make it work if i should decide it would help.
Understanding Thrust from this change
I am trying to grasp how a car uses rear weight for traction. I believe generally its rear percentage, but when the car is in dynamic stage and up on the bars and massive hold down on RF with a soft spring. I feel like this has to be causing some loss in rear traction in order to gain better steering. but anything can be overdone. How does the rear weight in dynamic state effect the top rear bars as they provide the traction. What ive also done is when car is on scales i jack up the left rear till its at full droop and i have been paying attention to how the weight is being distributed during this. The left Rear wheel becomes almost 0. I was wondering if anyone has some thoughts on this.
Im thinking of releasing rebound until i loose exit steering ability, which should gain rear traction. And my 5 inch engine setback is causing and helping the car get on the RF nicely, but at what cost. Maybe looking for a engineering technical explanation, and some on track experience with engine setback and some cross-weight and rear percentage issues from this. Trying to learn from what i have done and what to expect. I have had very good success on dry slick tracks, but not on tacky or muddy tracks.
bar angles and weight at LR tire
you might try this:
Use a ratchet strap to pull and hold LR axle forward. Make sure to fully extend the LR. this will give you a general idea what the weight is doing without cornering forces, and thrust angles.