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Search found 203 matches

by BobbyB
Mon Oct 14, 2019 2:05 pm
Forum: Engine Tech
Topic: Timing Curve
Replies: 47
Views: 1576

Re: Timing Curve

750 carb drives very good. Secondary butterflies are almost fully closed. Max vacuum in park is 13” hg, 11” hg in gear. Afr about 13 in park, 13.5 in gear. Base timing now 28* total timing 32*. First drive showed afr about 13 at cruise so dropped main jets from 72 to 70. Jet change dropped afr to a...
by BobbyB
Sat Oct 12, 2019 5:51 pm
Forum: Engine Tech
Topic: Timing Curve
Replies: 47
Views: 1576

Re: Timing Curve

750 carb drives very good. Secondary butterflies are almost fully closed. Max vacuum in park is 13” hg, 11” hg in gear. Afr about 13 in park, 13.5 in gear. Base timing now 28* total timing 32*. First drive showed afr about 13 at cruise so dropped main jets from 72 to 70. Jet change dropped afr to ab...
by BobbyB
Sat Oct 12, 2019 5:41 pm
Forum: Engine Tech
Topic: Timing Curve
Replies: 47
Views: 1576

Re: Timing Curve

Knight rider wrote:
Sat Oct 12, 2019 4:30 pm
This might have been asked already, but how was the cam timing set and what heads are you running. Cheers
Cam timing was set per the Cam card, 106 icl for 224/228 at .050, 110 lobe centers .528” hft. Heads are older afr 165 s with 1.94 intake valves that flow about 255 cfm max.
by BobbyB
Fri Oct 11, 2019 8:00 pm
Forum: Engine Tech
Topic: Timing Curve
Replies: 47
Views: 1576

Re: Timing Curve

William’s advice was to try an old 750 cfm 3310-2. I hope to drive it tomorrow.
by BobbyB
Thu Oct 10, 2019 9:52 am
Forum: Engine Tech
Topic: SBC tunnel ram
Replies: 41
Views: 3668

Re: SBC tunnel ram

Congratulations! Did you ever do any data logging as some suggested?
by BobbyB
Wed Oct 09, 2019 4:31 am
Forum: Engine Tech
Topic: EMC 289
Replies: 63
Views: 2378

Re: EMC 289

Congratulations!
by BobbyB
Tue Oct 08, 2019 2:27 pm
Forum: Engine Tech
Topic: Roller lifter side load: pushrod angle vs offset pushrod seat
Replies: 5
Views: 355

Re: Roller lifter side load: pushrod angle vs offset pushrod seat

On another forum there was a discussion on using offset rocker arms with standard (centered) vs offset-pushrod-seat roller lifters. Someone asked if the side load on the lifter is worse if the pushrod seat is centered w/ a more angled pushrod or when the pushrod seat is offset w/ a less angled push...
by BobbyB
Tue Oct 08, 2019 12:04 pm
Forum: Engine Tech
Topic: 4150 Transition Puzzle
Replies: 16
Views: 734

Re: 4150 Transition Puzzle

Just a thought... You can buy a thermocouple reader that has 4 inputs from Amazon for not much $. You can mount the reader in the car and run the tcouples to your carb...air clearer... wherever under the hood. I just tape the tcouples on with making tape or duct tape. I have goofed with them and lea...
by BobbyB
Tue Oct 08, 2019 10:05 am
Forum: Engine Tech
Topic: Timing Curve
Replies: 47
Views: 1576

Re: Timing Curve

I hope to see William tonight. I will see he says about IABs. Thanks.
by BobbyB
Mon Oct 07, 2019 8:39 pm
Forum: Engine Tech
Topic: Timing Curve
Replies: 47
Views: 1576

Re: Timing Curve

How much primary T-slot is exposed now? If you want the idle/T-slot circuit to be leaner I would first try a larger air bleed. I have no idea why anyone who actually has practical carb tuning experience would advise against changing air bleeds, particularly idle air bleeds, they have the most signi...
by BobbyB
Mon Oct 07, 2019 3:59 pm
Forum: Engine Tech
Topic: Timing Curve
Replies: 47
Views: 1576

Re: Timing Curve

Thanks Tuner & Bill. My Quick Fuel Brawler came with an allen set screw that I can access from the bottom with out taking the carb off. It is a pain, but it can be done. How the heck can Quick Fuel /Holley techs say to give the secondaries .020" of transfer slot??? I am way past having the transfer ...
by BobbyB
Mon Oct 07, 2019 3:26 pm
Forum: Engine Tech
Topic: Timing Curve
Replies: 47
Views: 1576

Re: Timing Curve

Thanks Tuner.

With the carb on the car, how do you know when the secondary butterflies are open the correct amount?
by BobbyB
Mon Oct 07, 2019 5:53 am
Forum: Engine Tech
Topic: Timing Curve
Replies: 47
Views: 1576

Re: Timing Curve

In case it has not been mentioned. Are you running a PCV? If vac is low, or the PCV is faulty, it will admit too much air at idle & require closing the t/blades. I am running a PCV valve. It is from a 74 ford Torino 302. It seems to be in good shape. Can you recommend a PCV valve from a particular ...
by BobbyB
Sun Oct 06, 2019 9:27 pm
Forum: Engine Tech
Topic: Timing Curve
Replies: 47
Views: 1576

Re: Timing Curve

If one reinvents the wheel... Is it still round? Maybe I am misunderstanding this post but 90 hundred million bazillion (not a real number) people have shown/proven tunes for this type of application and yet everyone wants to start in left field and then try to wonder why they are having issues? Wh...
by BobbyB
Sun Oct 06, 2019 8:41 pm
Forum: Engine Tech
Topic: Timing Curve
Replies: 47
Views: 1576

Re: Timing Curve

GARY C wrote:
Thu Oct 03, 2019 4:28 pm
Is 25 total?

I would increase initial timing until I get the highest idle vacuum at desired idle speed and then limit total to 34 and start there.
To do this, I would have to reduce initial timing because idle speed was too high. This was the basis of me starting this thread.