Messages

16

Maintenance / 69Z hard start, backfires on acceleration, stalls when breaking, related issues?

« on: November 20, 2013, 11:11:29 PM »

After a recent rebuild, I find myself chasing down gremlins here and there. One thing is bothering me, and since I am not much of a mechanic at all, I am hoping someone can spot the problem.

1. The weather has gotten cool, and I have an issue with difficult starts. Once started, she idles well while I am waiting for it to warm up.
2. Once running, if I accelerate more than a tiny bit, I have backfiring and sputtering. If I accelerate very slowly, it's fine. This goes away if I drive it for a long while, and lessons as the day warms up, but never goes away completely.
3. One longer cruises, sometimes when I roll into a turn while breaking, it will stall. Sometimes it will stall when coming to a stop even on a straight away.

Frustrating! 

'69 Z/28
DZ302, recent rebuild.
Holly Carb (4053)
New break booster/Master Cylinder
Orig. M21 tranny
Pretty much all stock otherwise

17

Originality / Re: 69Z Brake Booster input shaft length???

« on: November 09, 2013, 03:08:36 AM »

Well, I went ahead and cut it down. Everything works well now. Still wondering about the different rod length. 

18

Originality / 69Z Brake Booster input shaft length???

« on: November 09, 2013, 12:03:32 AM »

I purchased a reproduction booster for my 69Z, and the input shaft (to the brake pedal) seems to be too long. I have yet to get it adjusted and not cause the brakes to drag. The rod makes contact with the pedal itself, preventing further shortening. I checked the rod length with my old booster, and the new one looks about 1" longer.

Any reasons why this would be so? There were different valve rod/input shaft lengths? Should I just cut the rod down? It's close.

Shane

19

Originality / Re: 69Z Brake Booster Oddity

« on: November 04, 2013, 07:17:11 PM »

Can you show a closeup of the front to see the triangles? That will be easy to see if it's a reproduction nor not.

Hey Mike, take a look at the 3rd photo in the original post. You may have to scroll to the right.

Shane

20

Originality / Re: 69Z Brake Booster Oddity

« on: November 04, 2013, 05:03:53 PM »

As I understand it, some boosters on '69 cars were made in late 68. In 1968, 251 would have been around September 8th. So before I write this booster off as a reproduction, I want to make sure. Since mine is an 04C car, is it unlikely that a September 68 booster would be original?

21

Originality / Re: 69Z Brake Booster Oddity

« on: October 31, 2013, 01:37:54 PM »

There was a detailed conversation about boosters recently here: http://www.camaros.org/forum/index.php?topic=10134.0

Thanks Mike. I had read through that one. While my question wasn't answered there, I probably should have just revived the thread anyway, instead of starting a new one. If a mod would like to merge it, no worries here.

22

Originality / 69Z Brake Booster Oddity

« on: October 30, 2013, 10:53:09 PM »

I removed my nasty old painted brake booster today, and was thinking of having it rebuilt. However, I am not sure it is correct. The top tab has the number 9204 on one side, and 251 on the other. This seems to conflict with information I found here. For one, my 69Z is an 04C car. So the julian looks way off, unless it is a 68 date. Also, the DELCO MORAINE stamp is at the about the 2 or 3 O'clock position and larger letters.

Any ideas on what is going on here? Wrong booster?

-Shane

23

Mild Modifications / Re: Reproduction AM/FM quality?

« on: October 22, 2013, 12:42:34 AM »

... and have to say that the pointer drive is anything but quiet stepper motor precision, sounds more like a sewing machine!

Jeeziminy!

Is that normal for these radios? Did you contact the seller?

I've been considering one of these for a long time, but the uber high pricing has kept me at bay. Seems that for that price, it would support bluetooth streaming or have a usb port hidden somewhere in the back or via a extender wire.

24

Mild Modifications / Re: Cross Ram Z in action - sorta - check er out

« on: October 15, 2013, 05:19:06 PM »

Sweet. That's not the $25k NOS crossram setup from HeartbleatCity was it? lol

25

Mild Modifications / Re: New 69 Z28 302 rebuild, dizzy has rev limiter. What is the best RPM limitation?

« on: October 15, 2013, 12:00:47 PM »

Relative question ,what are you doing with it ? Racing ,cruising with an occasional bang through the gears ?

You got it! Cruising with an occasional bang through the gears. I may run it up the strip on a drag night with my club just for fun, but not often. I'm after a little insurance against missing a clean shift/gear wherever I may be.

BTW, my bad on the spellun... Pertronix.

So as I understand it, the advice here seems to be between 6800 and 7200? It was set at 7100, although for some reason, it seems to be cutting in at 5100 right now. I am going to take a closer look as soon as I get a chance.

Great info all around, thanks folks!

Shane

26

Mild Modifications / New 69 Z28 302 rebuild, dizzy has rev limiter. What is the best RPM limitation?

« on: October 14, 2013, 05:11:18 PM »

I respect the fact that there are opinions regarding the use of rev limiters. However, there is one on my DZ 302 now, so I am seeking some sage advice on what it should be set to?

I recently had the engine rebuilt (original numbers). I am now at .060 over. I tried very hard to stay original on everything. However, the distributor needs work, so I replaced it with a petronics setup that looks rather stock, but includes the electronic setup and rev limiter.

What would be the ideal set point for the rev limiter?


Shane

27

Restoration / Re: Harmonic Balancer - 1969 Z/28

« on: August 02, 2013, 05:51:09 PM »

You don't want the first one (the 6.1" one) - the 302 requires the heavy 8" balancer; the GM replacement most outfits sell will work fine, and will look pretty much original with the pulleys installed. The GM original is much more expensive, and has the face ribs that run all the way out to the edge of the hub.

Thanks, John and all, I'll probably go with the one from Rick's.

28

Restoration / Re: Harmonic Balancer - 1969 Z/28

« on: August 02, 2013, 05:46:36 PM »

http://www.heartbeatcitycamaro.com/store/product/13204/Camaro-Harmonic-balancer-302-USA-1969/

Nice option, but backordered. 

29

Restoration / Harmonic Balancer - 1969 Z/28

« on: August 01, 2013, 10:40:28 PM »

I'm having my engine rebuilt for my 69Z and need to decide on the harmonic balancer. This is not a concourse car, but I try to keep it as original as my budget allows with particular attention to appearance.

I am looking at these two.

http://www.jegs.com/i/Professional+Products/428/80010/10002/-1?CAWELAID=1710581559&catargetid=1784162075&cadevice=c&&cagpspn=pla&gclid=CKDWhsGn3bgCFcOe4Aod6HMAZg

http://www.rickscamaros.com/camaro-crankshaft-harmonic-balancer-302ci-1969.html

Obviously one looks more 'original' than the other. Does this make much of a difference? One is much more expensive than the other, and I am not sure just how noticeable this will be. Thoughts?

30

General Discussion / Re: Crane XR-i points conversion question.

« on: August 01, 2013, 07:39:38 PM »

I like the points idea. Not a big fan of electronics that can drop out on you without notice. However, it is the rev limiter I am after.