DIY, dist. test machine

Reply Subscribe

Thread Tools

Search this Thread

Apr 14, 2005 | 01:00 PM

#21

Matt Gruber

Race Director

Joined: Oct 2000

Posts: 15,009

Likes: 79

From: central FL, near the beach.

Quote:

Originally Posted by comp

How ??? never heard of doing it that way... you using a scale like a "trigger pull" scale

i've used drill bits to set max weight advance.
a scale would speed up finding the right curve.
not as fast as a sun, but faster than bubba w/timing light. even if it was slower, at least u are not bending over a hot engine as much.

Apr 14, 2005 | 01:06 PM

#22

comp

Thread Starter

Team Owner

Joined: Sep 2003

Posts: 88,393

Likes: 2

From: eville in

my back is my problem,,,well most of it

To get real close before
droping in dist. is what i need

Apr 14, 2005 | 01:32 PM

#23

Tom454

Le Mans Master

Joined: Apr 1999

Posts: 6,134

Likes: 46

From: Raleigh North Carolina

I'm a real dedicated DIY type.... and it would be cool to build a machine... but I do have to admit... using that old Sun machine was better than sex. Miss it dearly.

Apr 14, 2005 | 01:59 PM

#24

Matt Gruber

Race Director

Joined: Oct 2000

Posts: 15,009

Likes: 79

From: central FL, near the beach.

Quote:

Originally Posted by comp

my back is my problem,,,well most of it

To get real close before
droping in dist. is what i need

it's easy to set max weights on the bench. Really i don't miss that sun machine. Once max is set, i drop it in and try popular springs/weights. HAVE to drive it so a sun is useless at this point. 1st determine how much total YOUR combo likes. THEN how much initial it likes. Subtract I from T,that is the weights.
Measure how much the weights move. Say its .22" and gives 34*. Say U want 20*. 20/34=59%
.59x.22=.13(reduce stop to .13)

Last edited by Matt Gruber; Apr 14, 2005 at 02:06 PM.

Apr 14, 2005 | 02:05 PM

#25

comp

Thread Starter

Team Owner

Joined: Sep 2003

Posts: 88,393

Likes: 2

From: eville in

so there aren't "real" baseline weight's and spring's to go with without
testing ....

Apr 14, 2005 | 02:16 PM

#26

Matt Gruber

Race Director

Joined: Oct 2000

Posts: 15,009

Likes: 79

From: central FL, near the beach.

Quote:

Originally Posted by comp

so there aren't "real" baseline weight's and spring's to go with without
testing ....

lars can get u real close in most cases. send him your dist, or buy his kit.

Apr 14, 2005 | 02:20 PM

#27

comp

Thread Starter

Team Owner

Joined: Sep 2003

Posts: 88,393

Likes: 2

From: eville in

that's the problem i have 7 to do now and other's need their's tuned

Apr 14, 2005 | 02:29 PM

#28

stingr69

Le Mans Master

Joined: Mar 2004

Posts: 7,465

Likes: 1,485

From: Little Rock AR

Quote:

Originally Posted by comp

sounds like it would work,,, are all the RPM measurement going to be half ?????

I would not worry about the RPM points at first with this idea.

The purpose would be to set the amount of available centrifugal advance and vacuum advance while on the bench and then set the RPM start and finish points once it is back in the car. All you have to do after it is back in the car is swap the springs around and that does not need the distributor to be out of the car. Any fine tuning of the vacuum advance is done after the basic curve is all worked out.

-Mark.