Rear shock placement

[MrQuick]

this seems like a nice chest beating between racers... I think you got it wrong Yody,a buttdyno or butt-o-mometer measures revolution or RPM HP not pulling torque.Your thinking of a asser-ometer that measures a$$ felt acceleration. I've seen Den's Elco and it seems pretty fast, cause he cant keep the paint on it.I still have paint chips in my grill,thank you very much.
Builders / racers / restorers / painters / carpenters / etc...all do things differently to get the same end product. It is what ever works for that individual. If some of these guys wanna do it the hard or long way. let them. Either way tuning is going to be required. I have the F' it and do it attitude, so trial and error building is what in accustom with.Its just hard for me to grasp the use of a CAD program. I have to see it in action so thats where im headed.I wish I had the funding to do various testing and pre planning cause I have alot of very good ideas and plans that where inspired by Steve Smith, Sikora , K , Norm and others from this board.I've been planning a 3 link since last summer and i am getting close. Shock placement was one hurdle. Should have a rolling chassis by November.
Remember my stateing the lower mount needing to be 8" below the axle center line was a typo by the author so thats done right. productive thoughts please

[dennis68]

Yeah Yodi, the last motor was a sub-12 sec car albeit traction impaired. Trap speeds in the 115-117 range, no constant to base any tech on. That was with ladder bars and 3.73's (long gone and good riddance), I'm way past that stage now.

I've seen Den's Elco and it seems pretty fast, cause he cant keep the paint on it.I still have paint chips in my grill,thank you very much.

[yody]

i am interested in your combo! in no way am i trying to test you or prove you wrong or anything but you could you email me the details of the low 12 second combo? i like to hear good combo's that work i am trying to keep a log. thanks!
[email protected] sorry for the off post!

[David Pozzi]

Speaking as Moderator, please keep all comments on-subject and friendly, remember - posting here is a privilege.
(yody, I'm not talking about your fiew posts suggesting taking an off-subject to Email)

There is no reason in the world why we all must agree, we can RESPECTFULLY disagree all we want.

SpankyTWM
Please ease up a little and count to 10 before posting.

Thanks, David

[dennis68]

Hey Yodi---You Got Mail!, did you get it?

[yody]

yeah thanks! but you forgot to tell me the timeslip. thanks! how did you like the bowtie heads? what cc were they?

[Mean 69]

Seems to me that independent of the motion ratio issues, the angle of the shock, at least in a linked car, shouldn't matter. Bear with me, in a good linked suspension, all degrees of freedom are controlled by the links, not the shocks. As such, the only thing the shock could benefit from in terms of articulating directly in line with the suspension, in roll, for instance, would be pure radial forces inside the shock, on the piston/wall interface. Kind of like (no, exactly like) the side forces a piston sees in a motor.

With a stick axle, the suspension will have to deal with pure bump (which would suggest putting the shocks straight up), and roll (which varys, you could theoretically split the roll angle in half, and use this as the nominal setpoint). As Norm pointed out though, a good car will have a very low roll angle to begin with. So, I personally fail to see the benefit of angling for the purposes of suspension function, in and of itself.

To me, the angle is all about packaging. Putting the shocks outboard as far as possible is the best approach, and as was pointed out previously, the main reason the shocks will want to point inward is to clear previously established frame rails. On a recent project, a 65 FB Mustang that I was creating a torque arm package for, I tried to compromise the angle of the shock to prevent having to cut the floor up, but it was too steep and the spring rate in bump fell off too much for my liking (cosine effect), so I scrapped the idea.

Every car is different, ride height, suspension travel, shock length, etc, make creating a "rule of thumb" pretty darned difficult on this one.

P-T IS a mellow place, but if you'd like to challenge some smart folks with tech, and not worry about the language, attacking, etc, I know a really fun place for you to check out. I go there "very" often. But, you need to practice good written communication skills, or you will not be allowed to play. Didn't we go to school to learn that stuff?

Mark

[David Pozzi]

SpankyTWM
I thought you were making some good points except for a fiew over-reactions, but you seem to be over-reacting to me too!
David