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#41
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I would move near 12.5 to see what happens. I would think you could rule out af mixture pretty quickly by doing this........ It's a way to see how it likes the timing there and also how the temps react? Or have you done this already? I'm just spit balling here, I'm not sure how it would effect it but it's what I would do......
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Karl |
#42
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Quote:
A couple of guys have said to try the timing at 14 initial, and it might "Clean" the idle up. In the back of my mind though, I've got Jeff Kaufmann telling me "These heads don't like a lot of timing." It can't hurt... I guess.
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461 Cu. In. Pure Pontiac Power: 1969 Pontiac GTO - Back On Top - Popular Hot Rodding Magazine |
#43
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Most guys on here that run the KRE heads and OLD Faithful HR run around 12° initial and 32° total mechanical with an additional 10° of vacuum advance.
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Karl |
#44
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I have a "Staked" distributor that gives me 20 mechanical.
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461 Cu. In. Pure Pontiac Power: 1969 Pontiac GTO - Back On Top - Popular Hot Rodding Magazine |
#45
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So if you set it at 12° initial then add the 20° you get 32°total.
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Karl |
#46
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If I read your post correctly, you are saying that others with the same heads and cam are running 54 deg of timing.
If that is the case, I can definitely up my initial.
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461 Cu. In. Pure Pontiac Power: 1969 Pontiac GTO - Back On Top - Popular Hot Rodding Magazine |
#47
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Quote:
Initial = 12° Add 20° of mechanical Advance= 32° Mechanical timing Add 10° of vacuum advance= 42° Total timing at cruise
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Karl |
#48
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Ok, that makes more sense.
That is where I'm at.
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461 Cu. In. Pure Pontiac Power: 1969 Pontiac GTO - Back On Top - Popular Hot Rodding Magazine Last edited by 69*Goat; 06-15-2015 at 08:56 PM. |
#49
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These KRE heads do like 32 degrees of total timing. I've had 3 sets on the dyno and ever engine has been 32 degrees total.
I usually remove the springs on the distributor and set total timing at 32 degrees. You only need to rev the engine to around 1500 to 2000 rpm. I then re-install the springs to see where initial is at. I then taylor my bushing in the distributor to match what I want for initial timing. When it comes to adding vacuum advance you need to know what the engine is making for vacuum. There are different vacuum cans out there that operate at different amounts of vacuum. You can also taylor your vacuum amount with a stop either welded or a piece on metal. I have mine initial at 17 degrees and mechanical at 32 degrees. I add 7 degrees on the vacuum can connected to ported vacuum. Charles
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick. Best so far 9.95@134 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
#50
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Quote:
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Adam __________________ 1964 LeGTO 469, M21, 3.42 __________________ Sold: 1968 Pontiac LeMans Convertible See it go HERE |
#51
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Quote:
Why does it require so high an initial timing setting?
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Karl |
#52
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Quote:
There are others on here who can explain the time it takes for a molecule of gas to burn and flame front.. it's complicated.. but makes sense. Charles
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick. Best so far 9.95@134 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
#53
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Quote:
I run an MSD distributor and had a friend custom make me different size bushings so I can tailor my initial timing. My total timing will always be at 32 degrees for my application. So I just needed to set initial with different size bushings in the distributor.. I know which springs work the best for my total timing all in before 3000. Maybe a bit sooner.. Charles
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick. Best so far 9.95@134 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
#54
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69*Goat use distilled water.
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#55
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Russell, maybe I missed it.....what fan do you run?
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frittering and wasting the hours in an off hand way.... 1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. |
#56
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Update?
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Karl |
#57
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Stock Fan David with new medium duty fan clutch.
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461 Cu. In. Pure Pontiac Power: 1969 Pontiac GTO - Back On Top - Popular Hot Rodding Magazine |
#58
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Still dealing with it. I am headed over to torqjunki's house tomorrow and see what we can see.
I had to fix two header leaks so that I could get an accurate AFR gauge reading and make sure the mixture is correct. I have re-adjusted the timing, the idle speed, the mixture. it is still going to 200 on the gauge at idle in gear. Torqjunki has an infrared thermometer so I will at a minimum check the real temp. I am about half temped to put the timing at 14 initial, and see what it does. That would put my total timing (initial and mechanical) at 34.
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461 Cu. In. Pure Pontiac Power: 1969 Pontiac GTO - Back On Top - Popular Hot Rodding Magazine |
#59
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while there check the temp of the water going into the radiator,out of the radiator,at the thermostat housing and the X over etc.So easy to look for any hot spots while your at it.Tom
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#60
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Ok:
Feeling better about things. Infrared Thermometer showed the following:With the gauge reading 200 deg. 1) Rad outlet 178 deg 2) Rad inlet 178 deg 3) Thermostat housing 178 deg 4) water crossover at sensor 200 deg 5) Trans cooling lines 178 deg 6) Cylinder heads 179 deg My dist. springs were too weak to hold consistent timing. My vac advance was only giving me 7 deg advance, I had forgotten that I had put a stop in it, so upon investigation, I pulled it, elongated the hole and now I am getting 12-13 deg vac advance. re-djusted the carb, the timing. Right now I am at 30 deg, plus the 12-13 vacuum advance. It is a whole lot snappier now. I just need to decide if I want to move the temp sensor. torqjunki really helped me out on the deal.
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461 Cu. In. Pure Pontiac Power: 1969 Pontiac GTO - Back On Top - Popular Hot Rodding Magazine |
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