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#26 | |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
Posts: 496
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Re: Could me engine timing be inaccurate
Quote:
I previously did put it at 35 degrees advanced at approximately 2000 RPMs. I didn't have a tachometer though. What I found out Sunday though was that it is supposed to be adjusted to 32-34 degrees advanced at 3500 RPMs.
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1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#27 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,600
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Re: Could me engine timing be inaccurate
Your best bet is to set your initial timing at 12 degrees.
Leave it there! Lock it down and leave it there! If you keep setting your timing at high numbers like 35 at 2000 rpm you’ll cause damage to your pistons! |
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#28 | |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
Posts: 496
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Re: Could me engine timing be inaccurate
Quote:
Blueprints directions do not say to set it at 12 and leave it there. I'm just trying to get advice on following their specs. Not create new specs.
__________________
1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#29 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,600
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Re: Could me engine timing be inaccurate
If you follow their specs you will end up with 12-14 degrees initial.
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#30 |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
Posts: 496
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Re: Could me engine timing be inaccurate
Oh thanks. Does this mean that at idle it would show 12-14?
__________________
1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#31 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,600
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Re: Could me engine timing be inaccurate
Yes!
That’s what initial timing means. Timing at idle. Idle needs to be below 750 rpm though. |
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#32 | |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
Posts: 496
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Re: Could me engine timing be inaccurate
Quote:
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__________________
1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#33 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
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Re: Could me engine timing be inaccurate
It seems You didn't. mention lining up the rotor to #1 terminal on the dist cap.
George |
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#34 |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
Posts: 496
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Re: Could me engine timing be inaccurate
Running 13 degrees advanced at 700 RMP and 32 degrees advanced total possible not going any higher no matter how high the ROMs,,,,, that's all with the vacuum advanced plugged right?
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1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#35 |
Senior Member
![]() Join Date: Dec 2011
Location: Moraga, CA
Posts: 812
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Re: Could me engine timing be inaccurate
Usually the initial is with the vacuum disconnected.
BTW, I'm more a fan of experimenting with timing. The specs are just suggestions. As long as you can hear the knock (pinging, marbles in the coffee can, or whatever it sounds like to you), I'd advance the timing and see how it runs. If you have loud exhausts then stick to the specs. I had a Chevy S-10 pickup through the 1980s and 1990s didn't own a timing light. I just adjusted timing to get very light knock at wide open throttle. It ran much better when advanced from the factory/dealer tune-up settings. (I did some laboratory work with a Chevy 350 in the late 1980s also: https://www.sae.org/publications/tec...ontent/890161/)
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(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1 http://67-72chevytrucks.com/vboard/s...d.php?t=567340 Last edited by mattfranklin; 04-30-2024 at 05:01 PM. |
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#36 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,720
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Re: Could me engine timing be inaccurate
Am I the only one that reads this title in a pirate voice?
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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. |
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#37 |
Senior Member
![]() Join Date: Nov 2022
Location: Kansas City
Posts: 496
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Re: Could me engine timing be inaccurate
Lol, oh cr@p,,, I never even noticed I had a typo in there.
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1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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#38 |
Registered User
Join Date: Oct 2012
Location: VENTURA COUNTY CALIFORNIA
Posts: 283
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Re: Could me engine timing be inaccurate
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#39 |
Registered User
Join Date: Jan 2013
Location: Eastern TN
Posts: 1,921
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Re: Could me engine timing be inaccurate
Set timing as said then double check advance at 3500-4000 rpm. This guarantees that the distributer springs let all that timing in. SbC usually like 29-36 degrees total timing not including vac advance. I set to 36 degrees at high rpm then test drive and back it down from there. Many aftermarket distributors will have base timing at idle around 16 or 17 degrees. Honestly you don't need a tach. Set over all timing at a high rpm then note what it is at idle for future reference
This is the only way to do it unless you are recurving the distributer. The curve is dependent on the distributer wieghts and springs and on some distributors, the bushings |
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#40 |
Senior Member
![]() Join Date: Dec 2014
Location: Edmonton Alberta
Posts: 1,330
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Re: Could me engine timing be inaccurate
Yar.
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DAVE Edmonton, Alberta 1959 Apache 1967 K20 1968 C20 1970 C10 1972 GMC 2500 1981 C10 |
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drop distributor, setting timing, timing adjustment |
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