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Search found 2189 matches

by Tuner
Fri Sep 20, 2019 1:24 pm
Forum: Engine Tech
Topic: Air/ fuel ratio data logger
Replies: 27
Views: 1203

Re: Air/ fuel ratio data logger

Just reviewed some Lambda values for a drag racer. Just off the line the mixture went massively lean and acceleration G forces dropped. One second later the mixture recovered and held steady slightly rich of stoich at 10,000 rpm. Near the end of the run, the mixture again went erratically lean. Was...
by Tuner
Sun Sep 15, 2019 8:16 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 115
Views: 2676

Re: Low speed (1500-1800 RPM) driveability issue

Just want to share something I tried on Friday and it completely amazed me how well this worked. (Thanks Tuner, this is your idea.) Cut a piece of .010" stainless shim stock into the shape shown in the pic, sandwiched in between a new 4 hole gasket and 4 hole spacer, with a little bit of contact ce...
by Tuner
Sat Sep 14, 2019 12:16 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 115
Views: 2676

Re: Low speed (1500-1800 RPM) driveability issue

" like a milkmaid's fist " With your permission I'd like to have that in the ready for use in technical discussions at work. thanks, Dan T I think you can consider that as an "open source" description of a highly technical situation, but you may need to use a footnote for the uninitiated to underst...
by Tuner
Sat Sep 14, 2019 12:11 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 115
Views: 2676

Re: Low speed (1500-1800 RPM) driveability issue

[/attachment] Nice work. Thanks for posting the picture. New removable splitter filler. ================= I wonder how many manifolds with beautifully rounded, faired in carb openings are throwing away some drive-a-bility unnecessarily. Back in 1972 the folks at AMC said this to their SAE buds. Tha...
by Tuner
Fri Sep 13, 2019 10:30 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 115
Views: 2676

Re: Low speed (1500-1800 RPM) driveability issue

The one I made was a press fit, it had to be driven in, and it came loose in about 500-750 miles of daily driving. The engine was an LS-6 454 crate long-block. The cycles of heat and cool expand and contract the manifold so it squeezes the insert like a milkmaid's fist and the insert and the manifol...
by Tuner
Fri Sep 13, 2019 8:48 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 115
Views: 2676

Re: Low speed (1500-1800 RPM) driveability issue

About 40 years ago I made an insert like that for an Edelbrock C454 intake by filing the three sides of the notch in the plenum divider, both ends and the bottom, to a sharp edge on a 90 deg. angle (each 45 deg. from the manifold divider axis) and fabbing a 3/8" aluminum plate with sharp 90 deg. slo...
by Tuner
Thu Sep 12, 2019 4:20 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 115
Views: 2676

Re: Low speed (1500-1800 RPM) driveability issue

Update. Last night I made a temporary divider that works with my open spacer. It definitely made a difference in the right direction, but with the open spacer, there is a tip in stumble that I could not cure with a bunch of different accel pump cam/squirter combinations. It looks like the 4 hole sp...
by Tuner
Wed Sep 11, 2019 5:15 am
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 115
Views: 2676

Re: Low speed (1500-1800 RPM) driveability issue

How much does the manifold vacuum increase from curb idle to the level road 1500-1800 RPM?
by Tuner
Thu Sep 05, 2019 1:47 pm
Forum: Engine Tech
Topic: Air/ fuel ratio data logger
Replies: 27
Views: 1203

Re: Air/ fuel ratio data logger

Best bang for the buck is the Innovate LM-2
by Tuner
Thu Sep 05, 2019 1:36 pm
Forum: Engine Tech
Topic: Can I use Belzona to "shrink" manifold runners this much?
Replies: 26
Views: 2940

Re: Can I use Belzona to "shrink" manifold runners this much?

Recognizing there are several different JB Weld brand products, and several different epoxy brands similar to JB Weld, my first experience with epoxy dulling carbides was with the grey colored Marine-Tex. Close examination of the various available similar epoxies with some magnification will find th...
by Tuner
Wed Sep 04, 2019 11:43 pm
Forum: Engine Tech
Topic: Can I use Belzona to "shrink" manifold runners this much?
Replies: 26
Views: 2940

Re: Can I use Belzona to "shrink" manifold runners this much?

... As a result, I totally botched (bodged, for our UK readers) the job on the one bank of ports I worked on. If it is for a real race vehicle, does it really matter how it looks as long as it performs...? This isn't "not pretty", it's "grind it out and start over". :shock: At this point I'm going ...
by Tuner
Fri Aug 30, 2019 12:38 pm
Forum: Engine Tech
Topic: 350 cfm Holley 7448-1 idle too rich
Replies: 7
Views: 459

Re: 350 cfm Holley 7448-1 idle too rich

7448 has a 'normal', as in not reverse, idle system. If for some reason it has a reverse idle metering block with the blunt tip adjusting screws and .110" curb idle screw metering orifice it would act like the OP describes, could only tolerate the mixture screw barely cracked open. The standard 'nor...
by Tuner
Fri Aug 30, 2019 7:26 am
Forum: Engine Tech
Topic: carb questions
Replies: 9
Views: 517

Re: carb questions

When I go to WOT I am getting a slight bog and then it takes off and does fine. I have 2 1405 eldebrocks on a 427 BBC. Timing is locked out. I was going to go with the 1470 acc pump plungers and since this seems like a lean condition I was looking at metering rods and jets. Stk it has 100 primary j...
by Tuner
Wed Aug 28, 2019 4:37 pm
Forum: Engine Tech
Topic: Improved engine throttle responce
Replies: 23
Views: 1200

Re: Improved engine throttle responce

Some Rochester 4Jet carbs for early-mid '60s Chevys have four accelerator pump discharge streams, two in each primary bore, one down the venturi that targets on the side of the booster and one that shoots nearly horizontal and sprays on the choke blade. Some Rochester B 1bbls for 216-235 Chevy have ...
by Tuner
Wed Aug 28, 2019 3:06 am
Forum: Engine Tech
Topic: Titanium solid lifters
Replies: 12
Views: 997

Re: Titanium solid lifters

Chineseium...just like the drill bits. Working with quality cutting tools for a living... you can spot junk cutting tools from a mile away. My favorite is the swap meet guy selling old dull cutting tools with fresh gold spray paint. Makes you want to give them a swift kick to the genitals. I always...