Norwood

[Vince@Meanstreets]

you should be good now that you clearanced the primary. You could put all the tricks in there but it take air flow to keep it from burning up.

Nice job on the carb. Sometime you have to thow the book out the window and go by gut feel and fact. Are you getting any idle circuit from the secondaries?

[Sieg]

Originally Posted by Vince@MSperfab

you should be good now that you clearanced the primary. You could put all the tricks in there but it take air flow to keep it from burning up.

Nice job on the carb. Sometime you have to thow the book out the window and go by gut feel and fact. Are you getting any idle circuit from the secondaries?

Awesome! I can be the only guy at Lat-g with a mini-brake duct routed to the #5 primary! I'm on it!

Thanks - I should have tossed the rules on the carb sooner, but fell victim to trusting the tech's specification. I did email him my experience and results so hopefully it benefits others.

I do have a reasonable signal from the secondaries, now that I've found the zone I'll be able to fine tune balance front to rear and optimize signal and vacuum. Then I can get into tuning and testing the fun stuff - pump cams and squirters.

[intocarss]

Originally Posted by Sieg

Awesome! I can be the only guy at Lat-g with a mini-brake duct routed to the #5 primary! I'm on it!

Thanks - I should have tossed the rules on the carb sooner, but fell victim to trusting the tech's specification. I did email him my experience and results so hopefully it benefits others.

I do have a reasonable signal from the secondaries, now that I've found the zone I'll be able to fine tune balance front to rear and optimize signal and vacuum. Then I can get into tuning and testing the fun stuff - pump cams and squirters.

Wouldn't that be called a "plug duct??

Glad you're making progress

[Sieg]

Originally Posted by intocarss

Wouldn't that be called a "plug duct??

Glad you're making progress

Gotcha.

Plug Duct acquired, installation should be relatively simple.

[Sieg]

Back to business..........

I fiddled with the fuel screws and throttle positions and obtained near 12" vacuum at 1K rpm which is as good as it gets with this cam IMO.

Throttle response right off idle felt good actuating it by hand. The initial timing was 13-14* with 21* mechanical. I decided to experiment with initial timing and see how the motor would respond. I bumped it to 15-16* and immediately had a big flat spot right off idle. WTF? Dropped it to 12-13* and still had the flat spot. Put it back to 13-14* and the flat spot was still there......I managed to create a flat spot without touching the carb settings, just changing the initial advance.

I list timing as 12-13*, 13-14*, 15-16* because that's what it is when locked down.

I've had subtle doubts since this motor went back together...........something hasn't seemed quite right and this latest issue is supporting my suspicions.

Gear drive or distributor possibly creating issues?

[protour73]

Dammit Sieg, hate to hear this!!! I am living vicariously through your ability to be able to be out working on your car. We are getting our butts kicked by winter this week here in Chicago.

[Sieg]

Originally Posted by protour73

Dammit Sieg, hate to hear this!!! I am living vicariously through your ability to be able to be out working on your car. We are getting our butts kicked by winter this week here in Chicago.

I'm taking a little break from it........5 hours yesterday, 6 hours today, and probably 4 hours tomorrow...........pressure-washing concrete in the rain.

[protour73]

Originally Posted by Sieg

I'm taking a little break from it........5 hours yesterday, 6 hours today, and probably 4 hours tomorrow...........pressure-washing concrete in the rain.

Probably best, or else you get wrenches stuck in the garage walls from the ole "Frustration Toss"!! LOL

[glassman]

Man carbs can be a bi?€h. Makes me want to mow lawns for a month to get efi...

[Vegas69]

Originally Posted by Sieg

Back to business..........

I fiddled with the fuel screws and throttle positions and obtained near 12" vacuum at 1K rpm which is as good as it gets with this cam IMO.

Throttle response right off idle felt good actuating it by hand. The initial timing was 13-14* with 21* mechanical. I decided to experiment with initial timing and see how the motor would respond. I bumped it to 15-16* and immediately had a big flat spot right off idle. WTF? Dropped it to 12-13* and still had the flat spot. Put it back to 13-14* and the flat spot was still there......I managed to create a flat spot without touching the carb settings, just changing the initial advance.

I list timing as 12-13*, 13-14*, 15-16* because that's what it is when locked down.

I've had subtle doubts since this motor went back together...........something hasn't seemed quite right and this latest issue is supporting my suspicions.

Gear drive or distributor possibly creating issues?

Did the engine temperature change? That amount of timing shouldn't make much difference to a bog. You aren't going to tune out a stumble with idle mixutre and transfer slot. It's time to start playing with accel pump cams.