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  #16  
Old 29-09-2012, 09:01 PM
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i would start by bumping up your timing to 12 degrees and for a drive and see what it does, but make sure it is not pinging, if so retard the timming a bit until it stops.
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  #17  
Old 30-09-2012, 09:32 AM
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I'm interested to see what aftermarket (performance ?) cam specifies just 2 advance..
Do you have the cam's part number Russ?
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  #18  
Old 30-09-2012, 09:34 AM
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that recommendation of 2 degree would be when fitting it? maybe?
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  #19  
Old 30-09-2012, 09:44 AM
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No cam sopecifies an advance or retard when dialing in, otherwise they'd just grind it that way for a straight-up install.
It's up to the installer if he needs more intake or exhaust valve clearance.
If you've bought a new cam and then feel you need to phase it, you probably bought the wrong one.
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  #20  
Old 30-09-2012, 12:24 PM
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Re-reading the cam card, it looks as though the 2 BTDC is for setting the cam in position.




I'd never really paid attention to it until now. I read the BTDC number and assumed that was the timing.

Have a bunch of receipts from when the motor was rebuilt over 10 years ago - but going through it there's nothing to indicate how timing was set.

I'll run out with the timing light and have a gander.

---------- Post added at 12:24 PM ---------- Previous post was at 11:16 AM ----------

Just checked the timing. Currently idles @ 12 BTDC.
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  #21  
Old 30-09-2012, 02:34 PM
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So I decided to replace the coil anyways and see how it went. Got it on, threading the last nut on for the positive wire - and the threaded stud snapped. haha.





It was only a $50 coil, but if it's so cheap that it can't even put it on without breaking, I'm not going to trust it on the car. Brand was Fuel Miser. Wanted the Bosch version but they have changed its design and it's no longer a cylinder type. This is what local Parts stores (Repco/Bullseye/SCA etc) now stock as the replacement.

Decided to put the old Mallory coil back on, and will now buy a complete replacement set-up - Coil/Dizzy/Leads - before I drive it any significant distance again.
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Last edited by Russ; 30-09-2012 at 02:37 PM..
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  #22  
Old 30-09-2012, 04:00 PM
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Is that vacuum advance distributor with the hose un plugged?

Yeah, your cam card just show where your valve should be opening when correctly in position at 0.. It's not suggesting it to be advanced.

Those threaded coil studs are sh!t. Was the coil made in China like the MSD Blaster 3 that happened to me?
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  #23  
Old 13-10-2012, 10:50 AM
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Well it wasn't the coil.

Switched it over this morning and took it for a cruise. Going well. Hit the freeway. Cruising along then I hit the first hill, gave it a boot-full to get up - half way up - same thing. Started kangaroo hopping. No popping or backfiring.

Exact same hill it first did it on the other week too.

Pulled to the left and sat on 80 until the next exit a couple K's away. Managed to make it home, but didn't go over 100. It did it a couple times again, but mainly when I put my foot down, usually to get up a hill.

At this stage my plan is to simply book it in with Chris @ SMS Performance in Padstow, but before I commit to that, I'd love to get my hands dirty on a few things and try and see if I can figure something out - or at the very least, learn something.

Whilst I was thinking it was an electrical/ignition problem, I wouldn't mind looking over the fuel system. Starting with the carby.

Can anybody recommend a book or website on properly tuning a carby? Holley 750 Double Pumper to be precise.
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  #24  
Old 13-10-2012, 11:10 AM
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I think your spot on that its the carb. If its only happening when your going up a hill.

What about when you just give it on a level road?
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  #25  
Old 13-10-2012, 02:06 PM
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I think your spot on that its the carb. If its only happening when your going up a hill.

What about when you just give it on a level road?
Fine on level suburban roads putting around at 60/70. Even when giving it a squirt. Nothing happens.

Problem has only ever been on the freeway doing freeway speeds (100+km/h). RPM range when it first happens is usually 3000 or so (car does approx 2700rpm's @ 110km/h)

If memory serves me correctly, each time I've taken it out, the first time it happens is always on an incline, just after a start giving it a bit to get up it.

After that first time, it'll go either way - sometimes on an incline without accelerating, other times on a flatter road whilst accelerating. Always on the freeway.

Always when under load. Never when idling, or revving in Neutral or Park.



.... and stupidly, I've just remembered something, the second of which is probably pertinent. When it received the last tune-up by the guys that changed the plugs, leads etc, (since the problems started) he told me 2 things:

1: There was some blow-by coming from cylinder 8. Said it wasn't much, but it was worth taking note of. Unfortunately he didn't actually take note of it and give me no specific numbers relating to the leak down test, nor did he give me any numbers from the compression test. Simply said "cylinder 8 has some blow-by".

2: He said he removed about an inch of vacuum advance. Didn't say why he though that necessary though. Just did it.
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  #26  
Old 13-10-2012, 03:37 PM
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How's your fuel filter/s?
Sounds more like lack of fuel supply to the carb than the carb.
Do you still have the sintered bronze inlet filter/s in place on your Holley?
The are 35 micron and filter well, but they have little capacity so they can clog quickly.
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  #27  
Old 13-10-2012, 04:35 PM
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Quote:
Originally Posted by Russ View Post
Well it wasn't the coil.


Whilst I was thinking it was an electrical/ignition problem, I wouldn't mind looking over the fuel system. Starting with the carby.

Can anybody recommend a book or website on properly tuning a carby? Holley 750 Double Pumper to be precise.
Here is youtube vid put out by Holley, but heaps of info on other forums

http://www.youtube.com/watch?v=INmSG7uWuYo
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  #28  
Old 13-10-2012, 04:55 PM
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have you advanced your timming yet?
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  #29  
Old 13-10-2012, 07:30 PM
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it,s far more likely fuel.unlikely to be the carb per se.
little cam like yours will not need more than 10-12 initial timing


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  #30  
Old 13-10-2012, 08:35 PM
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Originally Posted by 67SS502 View Post
have you advanced your timming yet?
Timing is at 12.
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