Jets changed, not cannot get float level to stay the same....
Thread Starter
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Fleet Mechanic
Joined: Jun 2007
Posts: 1,931
Likes: 2
From: Ohio
Jets changed, not cannot get float level to stay the same....
As many of you have seen my last post about the summit carb, yes it works great, but obviously it still could use tunning. It bogs a little when I open the secondaries at slow speeds, and when I WOT to 4k and shift to the next gear and go to WOT again, it I guess bogs, where it stumbles a little until I let off the gas and let it catch up then I can open all four again.
I'm thinking a heavier vacuum secondary spring?
Anyways here's two spark plugs I took pictures of, they all look the same.
#4
#5
Any info I can get would be great, like changes the jets and what not!
I'm thinking a heavier vacuum secondary spring?
Anyways here's two spark plugs I took pictures of, they all look the same.
#4
#5
Any info I can get would be great, like changes the jets and what not!
Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
Bogging when giving it gas indicates that you need a bigger squirt of gas from the accelerator pump. (IIRC, someone said this is a Holley copy. If so
This can be fixed by getting a bigger accelerator pump cam or getting a bigger nozzle. With the plugs being that lean, I'd say move up to at least 69's primary.
You need to do a proper plug chop, though. This is done by getting up to cruising speed and, without letting your foot off the gas, cutting the engine off. Coast to a stop and pull the plugs. This isolates the primaries and tells you how they're running.
This can be fixed by getting a bigger accelerator pump cam or getting a bigger nozzle. With the plugs being that lean, I'd say move up to at least 69's primary.You need to do a proper plug chop, though. This is done by getting up to cruising speed and, without letting your foot off the gas, cutting the engine off. Coast to a stop and pull the plugs. This isolates the primaries and tells you how they're running.
Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
No problem.
Cams:
Holley 20-12 - Holley Accelerator Pump Cams - Overview - SummitRacing.com
Just in case, secondary springs:
Summit Racing SUM-200451 - Summit Racing® Vacuum Secondary Spring Kits - Overview - SummitRacing.com
And if those 69's end up being too small, do yourself a favor and buy a jet kit like this:
JEGS Performance Products 15020 JEGS Holley® Jet Kit with Case
Cams:
Holley 20-12 - Holley Accelerator Pump Cams - Overview - SummitRacing.com
Just in case, secondary springs:
Summit Racing SUM-200451 - Summit Racing® Vacuum Secondary Spring Kits - Overview - SummitRacing.com
And if those 69's end up being too small, do yourself a favor and buy a jet kit like this:
JEGS Performance Products 15020 JEGS Holley® Jet Kit with Case
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Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
Oh, and make sure you've driven around for a little while before you do the plug chop. An 8-10 mile drive is enough. Also, keep in mind that you're looking at the color of the ceramic, not the electrode.
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Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
I believe it's this one: Summit Racing SUM-M08600VS - Summit Racing Street & Strip® Carburetors - Overview - SummitRacing.com
Thread Starter
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Fleet Mechanic
Joined: Jun 2007
Posts: 1,931
Likes: 2
From: Ohio
^That's it.
Thanks for the links. Once the semester ends and I go back to my full time job I'll buy those pump cams and secondary springs.
Another thing is how do I know if I need to go up/down jet sizes for the secondaries?
So after all this do my plugs still look good other than the lean condition?
Thanks for the links. Once the semester ends and I go back to my full time job I'll buy those pump cams and secondary springs.
Another thing is how do I know if I need to go up/down jet sizes for the secondaries?
So after all this do my plugs still look good other than the lean condition?
Thread Starter
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Fleet Mechanic
Joined: Jun 2007
Posts: 1,931
Likes: 2
From: Ohio
As always, there's yet another problem. I installed a set of 69 jets, and now when the engine is running, I CANNOT get the float level to stay the same. If I turn the crew an 1/8th turn clockwise, the bowl runs dry, turn it 1/8th turn counterclockwise, the bowl floods. You can literally watch the gas just rise or fall doing either of the two turns and not stop until flooding or running dry. WTF. I installed jets two sizes bigger and now this BS?
Thread Starter
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Fleet Mechanic
Joined: Jun 2007
Posts: 1,931
Likes: 2
From: Ohio
I figured it wasn't, but this has not done this till after I took the top of the carb off, put the jets in, and put the top back on. I had no issues with setting the float until I did this.