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 Post subject: Stupid fat
 Post Posted: Wed May 30, 2012 3:07 pm 
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Location: Maryland
I took my 3 circuit OS 9375 and put some OS 7320 blocks in it and it idles so rich that I can't get it warmed up before it runs me out of the garage. Here are the numbers.

TSJ 052
IFR 042 I can't get a good measurement on these. They are the Holley restriction.

MAB .027
IAB .070
Jets 92

Idle screws are 1 turn out. Blocks have 2 e holes. The IAB is where the intermediate bleed was. I didn't block off the 3 circuit idle bleed.

Where did I screw up (other than getting involved in racing)?


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 Post subject: Re: Stupid fat
 Post Posted: Wed May 30, 2012 4:11 pm 
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I pulled the carb off to check the t-slot exposure. I had none exposed, but that's because the guy that originally did this carb has (2) 10-32's in the top of the carb with each having a .100 hole. I'm thinking about plugging them, getting the slot square and maybe drilling some t-slot jets to .045.


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 Post subject: Re: Stupid fat
 Post Posted: Wed May 30, 2012 4:12 pm 
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Do that but leave the tslot jets alone..

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 Post subject: Re: Stupid fat
 Post Posted: Wed May 30, 2012 4:20 pm 
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Beretta wrote:
Do that but leave the tslot jets alone..


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 Post subject: Re: Stupid fat
 Post Posted: Wed May 30, 2012 7:10 pm 
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If its just an idle issue you need to work on the t-slot exposure and the IFR and IAB. Only some of the fuel comes from the idle port controlled by the screw. The main controls for idle are slot area and IFR and IAB. The t-slot jet is mainly effective at the top end of the slot, its used to trail off the slot so that it matches to the booster start.


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 Post subject: Re: Stupid fat
 Post Posted: Thu May 31, 2012 10:30 am 
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If I open the T-slot to .020 (square), won't the idle be richer than it was with no T-slot showing?

That was why I was going to reduce the feed to the T slot.


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 Post subject: Re: Stupid fat
 Post Posted: Thu May 31, 2012 11:59 am 
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The T slot exposure at idle is there to help keep it "wet", ie, just enough draw on it to keep fuel there for when the butterfly starts opening. I don't think there's enough fuel passing there at idle to have that much of an effect on the overall idle mix and even if it did, then once everything was set it shouldn't be an issue. The TSJ restricts flow as the throttle opens so even if you made it .050 instead of .057 that won't change what's happening at idle.

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