Author Topic: 302 is coming out. (Read 1459 times)

Horseplay · « **Reply #50 on:** October, 19, 2011, 08:30:36 AM »

Quote from: jmbour66 on October, 19, 2011, 07:55:24 AM

Okay, I'll play around with that. I'd like to get both the neutral idle and the in gear idle at about 600 rpm if possible.

That's awfully low, especially for neutral.

apollard · « **Reply #51 on:** October, 19, 2011, 09:22:19 AM »

What Terry said - nuetral and drive will not be near the same for an older carbed car with an automatic - there will be a couple hundred difference. 600 in drive would be OK - assuming your engine is stock or a very mild build.

jmbour66 · « **Reply #52 on:** October, 19, 2011, 09:36:22 AM »

Quote from: apollard on October, 19, 2011, 09:22:19 AM

What Terry said - nuetral and drive will not be near the same for an older carbed car with an automatic - there will be a couple hundred difference. 600 in drive would be OK - assuming your engine is stock or a very mild build.

Here is the engine data:

The engine is a 302 roller
Bored 40 over
E303 cam
GT heads
Victor Jr intake
C4 stock trans
Plugs are gaped at 35
Stock Distributor and Coil
carb is 600 CFM, with a vacuum secondary.

Maybe I should shoot for 1000 and 800 or so?

silverblueBP · « **Reply #53 on:** October, 19, 2011, 09:50:41 AM »

1000 would be too high unless it's got a nice lumpy cam. I have to keep mine at 1100 or it'll load up die.

apollard · « **Reply #54 on:** October, 19, 2011, 10:40:29 AM »

With an E303 cam, you should be able to idle at 800-850, 650 or so in drive. That's not that radical a cam (and pretty much the same as the Lunatti in my build).

jmbour66 · « **Reply #55 on:** October, 19, 2011, 11:05:10 AM »

Quote from: apollard on October, 19, 2011, 10:40:29 AM

With an E303 cam, you should be able to idle at 800-850, 650 or so in drive. That's not that radical a cam (and pretty much the same as the Lunatti in my build).

I'll shoot for that. Thanks to all!

jmbour66 · « **Reply #56 on:** October, 19, 2011, 04:05:49 PM »

I played around with the carb and had zero luck, I can't get it to a point where the car will stay running unless I'm at
1000+ RPM's in neutral and then it drops down to that 500 (a bit less) in gear.

Could it be the timing, or the plugs, or?

kb3 · « **Reply #57 on:** October, 19, 2011, 04:38:15 PM »

Did you change the firing order to the HO 5.0 order? It is different from the 73 firing order.

jmbour66 · « **Reply #58 on:** October, 19, 2011, 04:48:54 PM »

I sure did, I have it set the same as a 351w.

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jmbour66 · « **Reply #59 on:** October, 20, 2011, 02:59:27 PM »

I've been messing with the carb and timing and can get it set to a decent Park/Neutral Idle, but then I put it in gear and it stalls out.

any suggestions? I'm close to ditching my Summit Carb, but it worked great on the last engine!

kb3 · « **Reply #60 on:** October, 20, 2011, 03:06:49 PM »

You may have a vacuum leak. Have you checked around the base of the carb and the manifold? The distributor could be the problem as well, I recently was working on a Maverick that I had your same problem. The mechanical advance was not working right. I could get it to run at 1000 rpm fairly well, but could not get it to run at a lower rpm. I thought it needed carb tuning, ended up being the distributor.

jmbour66 · « **Reply #61 on:** October, 20, 2011, 03:20:36 PM »

Quote from: kb3 on October, 20, 2011, 03:06:49 PM

You may have a vacuum leak. Have you checked around the base of the carb and the manifold? The distributor could be the problem as well, I recently was working on a Maverick that I had your same problem. The mechanical advance was not working right. I could get it to run at 1000 rpm fairly well, but could not get it to run at a lower rpm. I thought it needed carb tuning, ended up being the distributor.

Good thinking. I'll check both.

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jmbour66 · « **Reply #62 on:** October, 22, 2011, 06:54:38 AM »

1 more stupid question from Iowa!

Would a slight exhaust leak (between header and head) cause trouble with the tuning of the carb?

I noticed that both sides have a slight leak, so I went and got thicker gaskets this AM........

jmbour66 · « **Reply #63 on:** October, 23, 2011, 05:02:00 AM »

Well regardless of the hearer leaks ( i took care of them with some Percy's gaskets), I did determine that I do have a vacuum leak at the base of the carb: one of the studs is stripped, or rather the intake is stripped. I think I can get around this by using all thread on that one corner which gets me deeper into the intake and into clean threads.