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Search found 316 matches

by GRTfast
Sat Sep 14, 2019 4:10 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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

http://www.leg.state.fl.us/statutes/index.cfm?App_mode=Display_Statute&URL=0300-0399/0316/Sections/0316.191.html Now, none of that "exhibition of speed" tomfoolery... :lol: All my spirited test drives were on a closed course, professional driver, do not attempt at home, warranty void when engine st...
by GRTfast
Sat Sep 14, 2019 3:52 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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

Kevin Johnson wrote:
Sat Sep 14, 2019 3:48 pm
Still running those hotter plugs? :wink:
Yes. Bkr5e-11

Looks like all the cylinders are pretty even mixture wise. Sealing up the two plenums from each other was a game changer. The torque in the 2500-4500 range is nasty.
by GRTfast
Sat Sep 14, 2019 3:37 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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

Final update... Car is running like a champ. Had to play with accel pump cams and squirters to get the low rpm throttle response dialed. Here are all the settings QFT 1050 cfm 4150: 2nd and 4th emulsion holes blocked IFR moved to bottom, 0.032 in all 4 corners IAB 0.063 front 0.073 rear MAB 0.026 al...
by GRTfast
Fri Sep 13, 2019 11:08 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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. sl...
by GRTfast
Fri Sep 13, 2019 10:35 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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 manifo...
by GRTfast
Fri Sep 13, 2019 10:33 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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

Status update... the combination of the divider filler and the 4 hole space is the hot ticket. The car is running smooth in the range where I was having the problem, and the low speed cruise afr is stable right at 14:1. Also, I am having the reduce the main jet sizes and the PVRC restrictor jets to ...
by GRTfast
Fri Sep 13, 2019 9:45 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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. sl...
by GRTfast
Fri Sep 13, 2019 7:31 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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

BobbyB wrote:
Fri Sep 13, 2019 7:04 pm
Nice work. Thanks for posting the picture.
New removable splitter filler.
by GRTfast
Fri Sep 13, 2019 6:49 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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

BobbyB wrote:
Thu Sep 12, 2019 8:12 am
Can you post a picture of the divider you made?
by GRTfast
Fri Sep 13, 2019 2:24 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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 GRTfast
Thu Sep 12, 2019 8:51 am
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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

F-BIRD'88 wrote:
Thu Sep 12, 2019 8:46 am
Likely a better camshaft for your purpose and driving would be the factory hyd roller cam from the GMPP 502-502 hp crate motor. 226-230 110 LSA 8 deg overlap. @.050
Verses current 28° overlap.

Or another cam like that.
Yeah, sometime soon I need to have Cam King make me a custom bump stick.
by GRTfast
Thu Sep 12, 2019 8:49 am
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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

Can you post a picture of the divider you made? I will when I take it out, I have a new 4 hole spacer on the way from summit. I made this open spacer out of the 4 hole I had (I have a mill). I milled the spacer open, then milled a couple slots in it that the divider fits into. The divider divides t...
by GRTfast
Thu Sep 12, 2019 8:08 am
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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 spa...
by GRTfast
Wed Sep 11, 2019 9:12 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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

With a light car and 3.25 rear gear, 1500-1800 rpm, and such a large carb, you are still cruising on the idle circuit . You can make 30+ hp before pulling a drop of fuel through boosters if the secondary throttle plate stop screw is opening plates even slightly at idle. It is very common for 1 boos...
by GRTfast
Wed Sep 11, 2019 9:12 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 104
Views: 2058

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

David_viny wrote:
Wed Sep 11, 2019 9:09 pm
Light flywheel/clutch? That will definitely contribute to the pulsing feeling at low rpm.
I used to, but it’s got a 28 lb steel flywheel now. That smoothed things out a lot.