06-12-2018, 03:19 PM | #26 | |
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Re: Timing Curve Advice
Quote:
Change one thing at a time, either retard the timing by 2* or regap the spark plugs, don't do both Also unless you are running 10.5 compression or something you don't need 91 octane, I realize you are trying to combat the pinging, but higher octane may be masking the real source of the problem |
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06-20-2018, 09:56 AM | #27 |
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Re: Timing Curve Advice
I know it's been a while, but just wanted to let everyone know all is well and say thanks for the advice. Dialed in the vac advance to the best setting, brought the initial down just a hair, and found out I was running leaner than I liked. The plugs were a bit white after some "spirited driving," so I stuck the big boy metering rods in with some stiffer springs. Running great!!
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06-20-2018, 09:57 AM | #28 |
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Re: Timing Curve Advice
On another note, all that running around paid off. I got a job that's going to double my annual income! Riding pretty high these last few days!
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06-20-2018, 11:12 AM | #29 | |
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Re: Timing Curve Advice
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06-20-2018, 11:12 AM | #30 |
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Re: Timing Curve Advice
Congratulations, and do not mention your raise or promotion around any appliances as they tend to break, lol, don't ask me how I know!
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06-20-2018, 01:09 PM | #31 |
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Re: Timing Curve Advice
Nothing bothers me more than finding a thread that sounds exactly like what you're experiencing, and then reading 4 pages to a dead end.
Thank you for the congratulations. |
06-20-2018, 06:17 PM | #32 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
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Re: Timing Curve Advice
Ding ding ding.
You need to mod the vaccum advance to only give about 10*. Vortecs only want between 32-34* total timing, the mechanical plus oem vaccum is in the 40* range. Lowering the base timing to get the less overall gives you a terribly running engine and poor performance everywhere except at cruise.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
06-20-2018, 06:51 PM | #33 | |
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Re: Timing Curve Advice
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06-21-2018, 08:53 AM | #34 | |
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Re: Timing Curve Advice
Quote:
Last edited by Gregski; 06-22-2018 at 10:23 PM. |
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06-21-2018, 03:16 PM | #35 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,748
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Re: Timing Curve Advice
Its run as good as you've known it to, doesn't mean its running as good as it can. Gregski is correct, many factors affect when you'll hear pinging/detonation. I ran 9.4:1 compression with oem gaskets and 87 octane because it was an oem take out truck vortec converted to carb. That doesn't mean the truck we're talking about now won't get better mileage and/or make more power with more adjustment to the timing curve. Just because vortecs chamber can handle more timing doesn't mean they like it.
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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