Technical > Roo Man's Room
Ney guy here.
PalliP:
Thanks for a quick reply.
The mobile jig comes in handy, because I am doing this at work :)
It sounds like a good idea to set the motor in one or two degrees, I think it will simplify Things.
What about the tiresize, am I far away with 28" or should I continue With 32". It will probably be better degree of the driver With the axle little bit lower.
What is the common ground clearance under the car? I thougth I had seen it in some regulations that 4 inch was the lowest?
The upprights is just temporary there, I was figuring the hight of the shoulder hoop.
Thanks again.
Palli
rooman:
Palli,
the minimum ground clearance in most rule books is 3" to a point 12" behind the front wheels and then 2" for the rest of the car. I usually set my lower rails at 3.25-3.5" from the front end to the motor plate and then they rake up from there. The 28" tire diameter will limit you somewhat in choices and width--I usually set my cars up to run a 31" tire if there are no specific choices by the owner. That way you can run anything from the nostalgia top fuel tire (12-13" wide) and up. With that diameter I set the axle centerline at 15" off the ground plane.
Roo
dreracecar:
--- Quote from: PalliP on November 14, 2013, 12:56:22 AM ---Hi there.
I have been Reading the article about the Old Master again and again and I have a question (probably a stupid one) why is the motor lower at front, is it because of the grafity point? or is it deeper thoughts behind it? In the Old Master the motor is 8 degres lower at front.
Another thing I cant decide, that is the tire size. I have to make up my mind about that so I can build the brackets for the axle, and fasten the motor. The motor and axle are now setup as I would use 32" tires and it is 5 degrees and With 32" tires I have 9 cm to the ground up to the lower tubes. I am wondering about lowering the motor/axle to use 28" tires and then I have more room for my big as and legs as the axle goes down.
Then the damper on the engine will be about 2cm from the lower point of the tubes.
Am I thinkin this in the wrong way?
Thanks again for great answers.
Regards.
Palli
--- End quote ---
Dont get worked up on motor angle, Its a relationship of 4 things
1-Tire size and how high you mount the rear end
2- type of rear end, Fords pinion is .500" lower than Chrysler- so less angle
3- how far out the engine is from MP to rear axle CL
4-front of oil pan/ blower pulley to ground clearence
Once those are set the angle is what it is
PalliP:
Hi there guys.
Thanks for all the good advises and merry Christmas!
I made some progress with my project. I lowered the axle about 3 cm and the backend of the motor. The line is now 2degrees. There is now more room for my legs ;D
I also moved the upper frame rail up so there is just enough Space the take out the last sparkplugs. I think I will have more strength in the rail that way.
dreracecar:
My personal preference is to have the rear end uprite no more than 1" ahead of the rear end housing as it makes the RE tighter to the frame so the chassie reacts better, too far back and the RE can dance and that magnifys if you run a really wide tire. Also at this time before you go further I would cut the shoulder hoop (between the front rollbar and the foward seat uprite) and install the inner (sleave) tubing support, Now is the time even tho you might not need it now for the spec, it might happen later or you might go up in class or sell the chassie to sombody esle
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